<?php
/*
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * GENERATED CODE WARNING
 * Generated by gapic-generator-php from the file
 * https://github.com/googleapis/googleapis/blob/master/google/spanner/v1/spanner.proto
 * Updates to the above are reflected here through a refresh process.
 */

namespace Google\Cloud\Spanner\V1\Gapic;

use Google\ApiCore\ApiException;
use Google\ApiCore\Call;
use Google\ApiCore\CredentialsWrapper;
use Google\ApiCore\GapicClientTrait;
use Google\ApiCore\PathTemplate;
use Google\ApiCore\RequestParamsHeaderDescriptor;
use Google\ApiCore\RetrySettings;
use Google\ApiCore\Transport\TransportInterface;
use Google\ApiCore\ValidationException;
use Google\Auth\FetchAuthTokenInterface;
use Google\Cloud\Spanner\V1\BatchCreateSessionsRequest;
use Google\Cloud\Spanner\V1\BatchCreateSessionsResponse;
use Google\Cloud\Spanner\V1\BatchWriteRequest;
use Google\Cloud\Spanner\V1\BatchWriteRequest\MutationGroup;
use Google\Cloud\Spanner\V1\BatchWriteResponse;
use Google\Cloud\Spanner\V1\BeginTransactionRequest;
use Google\Cloud\Spanner\V1\CommitRequest;
use Google\Cloud\Spanner\V1\CommitResponse;
use Google\Cloud\Spanner\V1\CreateSessionRequest;
use Google\Cloud\Spanner\V1\DeleteSessionRequest;
use Google\Cloud\Spanner\V1\DirectedReadOptions;
use Google\Cloud\Spanner\V1\ExecuteBatchDmlRequest;
use Google\Cloud\Spanner\V1\ExecuteBatchDmlRequest\Statement;
use Google\Cloud\Spanner\V1\ExecuteBatchDmlResponse;
use Google\Cloud\Spanner\V1\ExecuteSqlRequest;
use Google\Cloud\Spanner\V1\ExecuteSqlRequest\QueryMode;
use Google\Cloud\Spanner\V1\ExecuteSqlRequest\QueryOptions;
use Google\Cloud\Spanner\V1\GetSessionRequest;
use Google\Cloud\Spanner\V1\KeySet;
use Google\Cloud\Spanner\V1\ListSessionsRequest;
use Google\Cloud\Spanner\V1\ListSessionsResponse;
use Google\Cloud\Spanner\V1\Mutation;
use Google\Cloud\Spanner\V1\PartialResultSet;
use Google\Cloud\Spanner\V1\PartitionOptions;
use Google\Cloud\Spanner\V1\PartitionQueryRequest;
use Google\Cloud\Spanner\V1\PartitionReadRequest;
use Google\Cloud\Spanner\V1\PartitionResponse;
use Google\Cloud\Spanner\V1\ReadRequest;
use Google\Cloud\Spanner\V1\RequestOptions;
use Google\Cloud\Spanner\V1\ResultSet;
use Google\Cloud\Spanner\V1\RollbackRequest;
use Google\Cloud\Spanner\V1\Session;
use Google\Cloud\Spanner\V1\Transaction;
use Google\Cloud\Spanner\V1\TransactionOptions;
use Google\Cloud\Spanner\V1\TransactionSelector;
use Google\Protobuf\GPBEmpty;
use Google\Protobuf\Struct;

/**
 * Service Description: Cloud Spanner API
 *
 * The Cloud Spanner API can be used to manage sessions and execute
 * transactions on data stored in Cloud Spanner databases.
 *
 * This class provides the ability to make remote calls to the backing service through method
 * calls that map to API methods. Sample code to get started:
 *
 * ```
 * $spannerClient = new SpannerClient();
 * try {
 *     $formattedDatabase = $spannerClient->databaseName('[PROJECT]', '[INSTANCE]', '[DATABASE]');
 *     $sessionCount = 0;
 *     $response = $spannerClient->batchCreateSessions($formattedDatabase, $sessionCount);
 * } finally {
 *     $spannerClient->close();
 * }
 * ```
 *
 * Many parameters require resource names to be formatted in a particular way. To
 * assist with these names, this class includes a format method for each type of
 * name, and additionally a parseName method to extract the individual identifiers
 * contained within formatted names that are returned by the API.
 *
 * This service has a new (beta) implementation. See {@see
 * \Google\Cloud\Spanner\V1\Client\SpannerClient} to use the new surface.
 */
class SpannerGapicClient
{
    use GapicClientTrait;

    /** The name of the service. */
    const SERVICE_NAME = 'google.spanner.v1.Spanner';

    /** The default address of the service. */
    const SERVICE_ADDRESS = 'spanner.googleapis.com';

    /** The default port of the service. */
    const DEFAULT_SERVICE_PORT = 443;

    /** The name of the code generator, to be included in the agent header. */
    const CODEGEN_NAME = 'gapic';

    /** The default scopes required by the service. */
    public static $serviceScopes = [
        'https://www.googleapis.com/auth/cloud-platform',
        'https://www.googleapis.com/auth/spanner.data',
    ];

    private static $databaseNameTemplate;

    private static $sessionNameTemplate;

    private static $pathTemplateMap;

    private static function getClientDefaults()
    {
        return [
            'serviceName' => self::SERVICE_NAME,
            'apiEndpoint' =>
                self::SERVICE_ADDRESS . ':' . self::DEFAULT_SERVICE_PORT,
            'clientConfig' =>
                __DIR__ . '/../resources/spanner_client_config.json',
            'descriptorsConfigPath' =>
                __DIR__ . '/../resources/spanner_descriptor_config.php',
            'gcpApiConfigPath' =>
                __DIR__ . '/../resources/spanner_grpc_config.json',
            'credentialsConfig' => [
                'defaultScopes' => self::$serviceScopes,
            ],
            'transportConfig' => [
                'rest' => [
                    'restClientConfigPath' =>
                        __DIR__ .
                        '/../resources/spanner_rest_client_config.php',
                ],
            ],
        ];
    }

    private static function getDatabaseNameTemplate()
    {
        if (self::$databaseNameTemplate == null) {
            self::$databaseNameTemplate = new PathTemplate(
                'projects/{project}/instances/{instance}/databases/{database}'
            );
        }

        return self::$databaseNameTemplate;
    }

    private static function getSessionNameTemplate()
    {
        if (self::$sessionNameTemplate == null) {
            self::$sessionNameTemplate = new PathTemplate(
                'projects/{project}/instances/{instance}/databases/{database}/sessions/{session}'
            );
        }

        return self::$sessionNameTemplate;
    }

    private static function getPathTemplateMap()
    {
        if (self::$pathTemplateMap == null) {
            self::$pathTemplateMap = [
                'database' => self::getDatabaseNameTemplate(),
                'session' => self::getSessionNameTemplate(),
            ];
        }

        return self::$pathTemplateMap;
    }

    /**
     * Formats a string containing the fully-qualified path to represent a database
     * resource.
     *
     * @param string $project
     * @param string $instance
     * @param string $database
     *
     * @return string The formatted database resource.
     */
    public static function databaseName($project, $instance, $database)
    {
        return self::getDatabaseNameTemplate()->render([
            'project' => $project,
            'instance' => $instance,
            'database' => $database,
        ]);
    }

    /**
     * Formats a string containing the fully-qualified path to represent a session
     * resource.
     *
     * @param string $project
     * @param string $instance
     * @param string $database
     * @param string $session
     *
     * @return string The formatted session resource.
     */
    public static function sessionName($project, $instance, $database, $session)
    {
        return self::getSessionNameTemplate()->render([
            'project' => $project,
            'instance' => $instance,
            'database' => $database,
            'session' => $session,
        ]);
    }

    /**
     * Parses a formatted name string and returns an associative array of the components in the name.
     * The following name formats are supported:
     * Template: Pattern
     * - database: projects/{project}/instances/{instance}/databases/{database}
     * - session: projects/{project}/instances/{instance}/databases/{database}/sessions/{session}
     *
     * The optional $template argument can be supplied to specify a particular pattern,
     * and must match one of the templates listed above. If no $template argument is
     * provided, or if the $template argument does not match one of the templates
     * listed, then parseName will check each of the supported templates, and return
     * the first match.
     *
     * @param string $formattedName The formatted name string
     * @param string $template      Optional name of template to match
     *
     * @return array An associative array from name component IDs to component values.
     *
     * @throws ValidationException If $formattedName could not be matched.
     */
    public static function parseName($formattedName, $template = null)
    {
        $templateMap = self::getPathTemplateMap();
        if ($template) {
            if (!isset($templateMap[$template])) {
                throw new ValidationException(
                    "Template name $template does not exist"
                );
            }

            return $templateMap[$template]->match($formattedName);
        }

        foreach ($templateMap as $templateName => $pathTemplate) {
            try {
                return $pathTemplate->match($formattedName);
            } catch (ValidationException $ex) {
                // Swallow the exception to continue trying other path templates
            }
        }

        throw new ValidationException(
            "Input did not match any known format. Input: $formattedName"
        );
    }

    /**
     * Constructor.
     *
     * @param array $options {
     *     Optional. Options for configuring the service API wrapper.
     *
     *     @type string $apiEndpoint
     *           The address of the API remote host. May optionally include the port, formatted
     *           as "<uri>:<port>". Default 'spanner.googleapis.com:443'.
     *     @type string|array|FetchAuthTokenInterface|CredentialsWrapper $credentials
     *           The credentials to be used by the client to authorize API calls. This option
     *           accepts either a path to a credentials file, or a decoded credentials file as a
     *           PHP array.
     *           *Advanced usage*: In addition, this option can also accept a pre-constructed
     *           {@see \Google\Auth\FetchAuthTokenInterface} object or
     *           {@see \Google\ApiCore\CredentialsWrapper} object. Note that when one of these
     *           objects are provided, any settings in $credentialsConfig will be ignored.
     *     @type array $credentialsConfig
     *           Options used to configure credentials, including auth token caching, for the
     *           client. For a full list of supporting configuration options, see
     *           {@see \Google\ApiCore\CredentialsWrapper::build()} .
     *     @type bool $disableRetries
     *           Determines whether or not retries defined by the client configuration should be
     *           disabled. Defaults to `false`.
     *     @type string|array $clientConfig
     *           Client method configuration, including retry settings. This option can be either
     *           a path to a JSON file, or a PHP array containing the decoded JSON data. By
     *           default this settings points to the default client config file, which is
     *           provided in the resources folder.
     *     @type string|TransportInterface $transport
     *           The transport used for executing network requests. May be either the string
     *           `rest` or `grpc`. Defaults to `grpc` if gRPC support is detected on the system.
     *           *Advanced usage*: Additionally, it is possible to pass in an already
     *           instantiated {@see \Google\ApiCore\Transport\TransportInterface} object. Note
     *           that when this object is provided, any settings in $transportConfig, and any
     *           $apiEndpoint setting, will be ignored.
     *     @type array $transportConfig
     *           Configuration options that will be used to construct the transport. Options for
     *           each supported transport type should be passed in a key for that transport. For
     *           example:
     *           $transportConfig = [
     *               'grpc' => [...],
     *               'rest' => [...],
     *           ];
     *           See the {@see \Google\ApiCore\Transport\GrpcTransport::build()} and
     *           {@see \Google\ApiCore\Transport\RestTransport::build()} methods for the
     *           supported options.
     *     @type callable $clientCertSource
     *           A callable which returns the client cert as a string. This can be used to
     *           provide a certificate and private key to the transport layer for mTLS.
     * }
     *
     * @throws ValidationException
     */
    public function __construct(array $options = [])
    {
        $clientOptions = $this->buildClientOptions($options);
        $this->setClientOptions($clientOptions);
    }

    /**
     * Creates multiple new sessions.
     *
     * This API can be used to initialize a session cache on the clients.
     * See https://goo.gl/TgSFN2 for best practices on session cache management.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedDatabase = $spannerClient->databaseName('[PROJECT]', '[INSTANCE]', '[DATABASE]');
     *     $sessionCount = 0;
     *     $response = $spannerClient->batchCreateSessions($formattedDatabase, $sessionCount);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $database     Required. The database in which the new sessions are created.
     * @param int    $sessionCount Required. The number of sessions to be created in this batch call.
     *                             The API may return fewer than the requested number of sessions. If a
     *                             specific number of sessions are desired, the client can make additional
     *                             calls to BatchCreateSessions (adjusting
     *                             [session_count][google.spanner.v1.BatchCreateSessionsRequest.session_count]
     *                             as necessary).
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type Session $sessionTemplate
     *           Parameters to be applied to each created session.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\BatchCreateSessionsResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function batchCreateSessions(
        $database,
        $sessionCount,
        array $optionalArgs = []
    ) {
        $request = new BatchCreateSessionsRequest();
        $requestParamHeaders = [];
        $request->setDatabase($database);
        $request->setSessionCount($sessionCount);
        $requestParamHeaders['database'] = $database;
        if (isset($optionalArgs['sessionTemplate'])) {
            $request->setSessionTemplate($optionalArgs['sessionTemplate']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'BatchCreateSessions',
            BatchCreateSessionsResponse::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Batches the supplied mutation groups in a collection of efficient
     * transactions. All mutations in a group are committed atomically. However,
     * mutations across groups can be committed non-atomically in an unspecified
     * order and thus, they must be independent of each other. Partial failure is
     * possible, i.e., some groups may have been committed successfully, while
     * some may have failed. The results of individual batches are streamed into
     * the response as the batches are applied.
     *
     * BatchWrite requests are not replay protected, meaning that each mutation
     * group may be applied more than once. Replays of non-idempotent mutations
     * may have undesirable effects. For example, replays of an insert mutation
     * may produce an already exists error or if you use generated or commit
     * timestamp-based keys, it may result in additional rows being added to the
     * mutation's table. We recommend structuring your mutation groups to be
     * idempotent to avoid this issue.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $mutationGroups = [];
     *     // Read all responses until the stream is complete
     *     $stream = $spannerClient->batchWrite($formattedSession, $mutationGroups);
     *     foreach ($stream->readAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string          $session        Required. The session in which the batch request is to be run.
     * @param MutationGroup[] $mutationGroups Required. The groups of mutations to be applied.
     * @param array           $optionalArgs   {
     *     Optional.
     *
     *     @type RequestOptions $requestOptions
     *           Common options for this request.
     *     @type int $timeoutMillis
     *           Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\ServerStream
     *
     * @throws ApiException if the remote call fails
     */
    public function batchWrite(
        $session,
        $mutationGroups,
        array $optionalArgs = []
    ) {
        $request = new BatchWriteRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setMutationGroups($mutationGroups);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['requestOptions'])) {
            $request->setRequestOptions($optionalArgs['requestOptions']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'BatchWrite',
            BatchWriteResponse::class,
            $optionalArgs,
            $request,
            Call::SERVER_STREAMING_CALL
        );
    }

    /**
     * Begins a new transaction. This step can often be skipped:
     * [Read][google.spanner.v1.Spanner.Read],
     * [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] and
     * [Commit][google.spanner.v1.Spanner.Commit] can begin a new transaction as a
     * side-effect.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $options = new TransactionOptions();
     *     $response = $spannerClient->beginTransaction($formattedSession, $options);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string             $session      Required. The session in which the transaction runs.
     * @param TransactionOptions $options      Required. Options for the new transaction.
     * @param array              $optionalArgs {
     *     Optional.
     *
     *     @type RequestOptions $requestOptions
     *           Common options for this request.
     *           Priority is ignored for this request. Setting the priority in this
     *           request_options struct will not do anything. To set the priority for a
     *           transaction, set it on the reads and writes that are part of this
     *           transaction instead.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\Transaction
     *
     * @throws ApiException if the remote call fails
     */
    public function beginTransaction(
        $session,
        $options,
        array $optionalArgs = []
    ) {
        $request = new BeginTransactionRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setOptions($options);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['requestOptions'])) {
            $request->setRequestOptions($optionalArgs['requestOptions']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'BeginTransaction',
            Transaction::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Commits a transaction. The request includes the mutations to be
     * applied to rows in the database.
     *
     * `Commit` might return an `ABORTED` error. This can occur at any time;
     * commonly, the cause is conflicts with concurrent
     * transactions. However, it can also happen for a variety of other
     * reasons. If `Commit` returns `ABORTED`, the caller should re-attempt
     * the transaction from the beginning, re-using the same session.
     *
     * On very rare occasions, `Commit` might return `UNKNOWN`. This can happen,
     * for example, if the client job experiences a 1+ hour networking failure.
     * At that point, Cloud Spanner has lost track of the transaction outcome and
     * we recommend that you perform another read from the database to see the
     * state of things as they are now.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $mutations = [];
     *     $response = $spannerClient->commit($formattedSession, $mutations);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string     $session      Required. The session in which the transaction to be committed is running.
     * @param Mutation[] $mutations    The mutations to be executed when this transaction commits. All
     *                                 mutations are applied atomically, in the order they appear in
     *                                 this list.
     * @param array      $optionalArgs {
     *     Optional.
     *
     *     @type string $transactionId
     *           Commit a previously-started transaction.
     *     @type TransactionOptions $singleUseTransaction
     *           Execute mutations in a temporary transaction. Note that unlike
     *           commit of a previously-started transaction, commit with a
     *           temporary transaction is non-idempotent. That is, if the
     *           `CommitRequest` is sent to Cloud Spanner more than once (for
     *           instance, due to retries in the application, or in the
     *           transport library), it is possible that the mutations are
     *           executed more than once. If this is undesirable, use
     *           [BeginTransaction][google.spanner.v1.Spanner.BeginTransaction] and
     *           [Commit][google.spanner.v1.Spanner.Commit] instead.
     *     @type bool $returnCommitStats
     *           If `true`, then statistics related to the transaction will be included in
     *           the [CommitResponse][google.spanner.v1.CommitResponse.commit_stats].
     *           Default value is `false`.
     *     @type RequestOptions $requestOptions
     *           Common options for this request.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\CommitResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function commit($session, $mutations, array $optionalArgs = [])
    {
        $request = new CommitRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setMutations($mutations);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['transactionId'])) {
            $request->setTransactionId($optionalArgs['transactionId']);
        }

        if (isset($optionalArgs['singleUseTransaction'])) {
            $request->setSingleUseTransaction(
                $optionalArgs['singleUseTransaction']
            );
        }

        if (isset($optionalArgs['returnCommitStats'])) {
            $request->setReturnCommitStats($optionalArgs['returnCommitStats']);
        }

        if (isset($optionalArgs['requestOptions'])) {
            $request->setRequestOptions($optionalArgs['requestOptions']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'Commit',
            CommitResponse::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Creates a new session. A session can be used to perform
     * transactions that read and/or modify data in a Cloud Spanner database.
     * Sessions are meant to be reused for many consecutive
     * transactions.
     *
     * Sessions can only execute one transaction at a time. To execute
     * multiple concurrent read-write/write-only transactions, create
     * multiple sessions. Note that standalone reads and queries use a
     * transaction internally, and count toward the one transaction
     * limit.
     *
     * Active sessions use additional server resources, so it is a good idea to
     * delete idle and unneeded sessions.
     * Aside from explicit deletes, Cloud Spanner may delete sessions for which no
     * operations are sent for more than an hour. If a session is deleted,
     * requests to it return `NOT_FOUND`.
     *
     * Idle sessions can be kept alive by sending a trivial SQL query
     * periodically, e.g., `"SELECT 1"`.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedDatabase = $spannerClient->databaseName('[PROJECT]', '[INSTANCE]', '[DATABASE]');
     *     $response = $spannerClient->createSession($formattedDatabase);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $database     Required. The database in which the new session is created.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type Session $session
     *           Required. The session to create.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\Session
     *
     * @throws ApiException if the remote call fails
     */
    public function createSession($database, array $optionalArgs = [])
    {
        $request = new CreateSessionRequest();
        $requestParamHeaders = [];
        $request->setDatabase($database);
        $requestParamHeaders['database'] = $database;
        if (isset($optionalArgs['session'])) {
            $request->setSession($optionalArgs['session']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'CreateSession',
            Session::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Ends a session, releasing server resources associated with it. This will
     * asynchronously trigger cancellation of any operations that are running with
     * this session.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedName = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $spannerClient->deleteSession($formattedName);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $name         Required. The name of the session to delete.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @throws ApiException if the remote call fails
     */
    public function deleteSession($name, array $optionalArgs = [])
    {
        $request = new DeleteSessionRequest();
        $requestParamHeaders = [];
        $request->setName($name);
        $requestParamHeaders['name'] = $name;
        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'DeleteSession',
            GPBEmpty::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Executes a batch of SQL DML statements. This method allows many statements
     * to be run with lower latency than submitting them sequentially with
     * [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql].
     *
     * Statements are executed in sequential order. A request can succeed even if
     * a statement fails. The
     * [ExecuteBatchDmlResponse.status][google.spanner.v1.ExecuteBatchDmlResponse.status]
     * field in the response provides information about the statement that failed.
     * Clients must inspect this field to determine whether an error occurred.
     *
     * Execution stops after the first failed statement; the remaining statements
     * are not executed.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $transaction = new TransactionSelector();
     *     $statements = [];
     *     $seqno = 0;
     *     $response = $spannerClient->executeBatchDml($formattedSession, $transaction, $statements, $seqno);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string              $session      Required. The session in which the DML statements should be performed.
     * @param TransactionSelector $transaction  Required. The transaction to use. Must be a read-write transaction.
     *
     *                                          To protect against replays, single-use transactions are not supported. The
     *                                          caller must either supply an existing transaction ID or begin a new
     *                                          transaction.
     * @param Statement[]         $statements   Required. The list of statements to execute in this batch. Statements are
     *                                          executed serially, such that the effects of statement `i` are visible to
     *                                          statement `i+1`. Each statement must be a DML statement. Execution stops at
     *                                          the first failed statement; the remaining statements are not executed.
     *
     *                                          Callers must provide at least one statement.
     * @param int                 $seqno        Required. A per-transaction sequence number used to identify this request.
     *                                          This field makes each request idempotent such that if the request is
     *                                          received multiple times, at most one will succeed.
     *
     *                                          The sequence number must be monotonically increasing within the
     *                                          transaction. If a request arrives for the first time with an out-of-order
     *                                          sequence number, the transaction may be aborted. Replays of previously
     *                                          handled requests will yield the same response as the first execution.
     * @param array               $optionalArgs {
     *     Optional.
     *
     *     @type RequestOptions $requestOptions
     *           Common options for this request.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\ExecuteBatchDmlResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function executeBatchDml(
        $session,
        $transaction,
        $statements,
        $seqno,
        array $optionalArgs = []
    ) {
        $request = new ExecuteBatchDmlRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setTransaction($transaction);
        $request->setStatements($statements);
        $request->setSeqno($seqno);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['requestOptions'])) {
            $request->setRequestOptions($optionalArgs['requestOptions']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'ExecuteBatchDml',
            ExecuteBatchDmlResponse::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Executes an SQL statement, returning all results in a single reply. This
     * method cannot be used to return a result set larger than 10 MiB;
     * if the query yields more data than that, the query fails with
     * a `FAILED_PRECONDITION` error.
     *
     * Operations inside read-write transactions might return `ABORTED`. If
     * this occurs, the application should restart the transaction from
     * the beginning. See [Transaction][google.spanner.v1.Transaction] for more
     * details.
     *
     * Larger result sets can be fetched in streaming fashion by calling
     * [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql]
     * instead.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $sql = 'sql';
     *     $response = $spannerClient->executeSql($formattedSession, $sql);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $session      Required. The session in which the SQL query should be performed.
     * @param string $sql          Required. The SQL string.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type TransactionSelector $transaction
     *           The transaction to use.
     *
     *           For queries, if none is provided, the default is a temporary read-only
     *           transaction with strong concurrency.
     *
     *           Standard DML statements require a read-write transaction. To protect
     *           against replays, single-use transactions are not supported.  The caller
     *           must either supply an existing transaction ID or begin a new transaction.
     *
     *           Partitioned DML requires an existing Partitioned DML transaction ID.
     *     @type Struct $params
     *           Parameter names and values that bind to placeholders in the SQL string.
     *
     *           A parameter placeholder consists of the `&#64;` character followed by the
     *           parameter name (for example, `&#64;firstName`). Parameter names must conform
     *           to the naming requirements of identifiers as specified at
     *           https://cloud.google.com/spanner/docs/lexical#identifiers.
     *
     *           Parameters can appear anywhere that a literal value is expected.  The same
     *           parameter name can be used more than once, for example:
     *
     *           `"WHERE id > &#64;msg_id AND id < &#64;msg_id + 100"`
     *
     *           It is an error to execute a SQL statement with unbound parameters.
     *     @type array $paramTypes
     *           It is not always possible for Cloud Spanner to infer the right SQL type
     *           from a JSON value.  For example, values of type `BYTES` and values
     *           of type `STRING` both appear in
     *           [params][google.spanner.v1.ExecuteSqlRequest.params] as JSON strings.
     *
     *           In these cases, `param_types` can be used to specify the exact
     *           SQL type for some or all of the SQL statement parameters. See the
     *           definition of [Type][google.spanner.v1.Type] for more information
     *           about SQL types.
     *     @type string $resumeToken
     *           If this request is resuming a previously interrupted SQL statement
     *           execution, `resume_token` should be copied from the last
     *           [PartialResultSet][google.spanner.v1.PartialResultSet] yielded before the
     *           interruption. Doing this enables the new SQL statement execution to resume
     *           where the last one left off. The rest of the request parameters must
     *           exactly match the request that yielded this token.
     *     @type int $queryMode
     *           Used to control the amount of debugging information returned in
     *           [ResultSetStats][google.spanner.v1.ResultSetStats]. If
     *           [partition_token][google.spanner.v1.ExecuteSqlRequest.partition_token] is
     *           set, [query_mode][google.spanner.v1.ExecuteSqlRequest.query_mode] can only
     *           be set to
     *           [QueryMode.NORMAL][google.spanner.v1.ExecuteSqlRequest.QueryMode.NORMAL].
     *           For allowed values, use constants defined on {@see \Google\Cloud\Spanner\V1\ExecuteSqlRequest\QueryMode}
     *     @type string $partitionToken
     *           If present, results will be restricted to the specified partition
     *           previously created using PartitionQuery().  There must be an exact
     *           match for the values of fields common to this message and the
     *           PartitionQueryRequest message used to create this partition_token.
     *     @type int $seqno
     *           A per-transaction sequence number used to identify this request. This field
     *           makes each request idempotent such that if the request is received multiple
     *           times, at most one will succeed.
     *
     *           The sequence number must be monotonically increasing within the
     *           transaction. If a request arrives for the first time with an out-of-order
     *           sequence number, the transaction may be aborted. Replays of previously
     *           handled requests will yield the same response as the first execution.
     *
     *           Required for DML statements. Ignored for queries.
     *     @type QueryOptions $queryOptions
     *           Query optimizer configuration to use for the given query.
     *     @type RequestOptions $requestOptions
     *           Common options for this request.
     *     @type DirectedReadOptions $directedReadOptions
     *           Directed read options for this request.
     *     @type bool $dataBoostEnabled
     *           If this is for a partitioned query and this field is set to `true`, the
     *           request is executed with Spanner Data Boost independent compute resources.
     *
     *           If the field is set to `true` but the request does not set
     *           `partition_token`, the API returns an `INVALID_ARGUMENT` error.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\ResultSet
     *
     * @throws ApiException if the remote call fails
     */
    public function executeSql($session, $sql, array $optionalArgs = [])
    {
        $request = new ExecuteSqlRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setSql($sql);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['params'])) {
            $request->setParams($optionalArgs['params']);
        }

        if (isset($optionalArgs['paramTypes'])) {
            $request->setParamTypes($optionalArgs['paramTypes']);
        }

        if (isset($optionalArgs['resumeToken'])) {
            $request->setResumeToken($optionalArgs['resumeToken']);
        }

        if (isset($optionalArgs['queryMode'])) {
            $request->setQueryMode($optionalArgs['queryMode']);
        }

        if (isset($optionalArgs['partitionToken'])) {
            $request->setPartitionToken($optionalArgs['partitionToken']);
        }

        if (isset($optionalArgs['seqno'])) {
            $request->setSeqno($optionalArgs['seqno']);
        }

        if (isset($optionalArgs['queryOptions'])) {
            $request->setQueryOptions($optionalArgs['queryOptions']);
        }

        if (isset($optionalArgs['requestOptions'])) {
            $request->setRequestOptions($optionalArgs['requestOptions']);
        }

        if (isset($optionalArgs['directedReadOptions'])) {
            $request->setDirectedReadOptions(
                $optionalArgs['directedReadOptions']
            );
        }

        if (isset($optionalArgs['dataBoostEnabled'])) {
            $request->setDataBoostEnabled($optionalArgs['dataBoostEnabled']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'ExecuteSql',
            ResultSet::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Like [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql], except returns the
     * result set as a stream. Unlike
     * [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql], there is no limit on
     * the size of the returned result set. However, no individual row in the
     * result set can exceed 100 MiB, and no column value can exceed 10 MiB.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $sql = 'sql';
     *     // Read all responses until the stream is complete
     *     $stream = $spannerClient->executeStreamingSql($formattedSession, $sql);
     *     foreach ($stream->readAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $session      Required. The session in which the SQL query should be performed.
     * @param string $sql          Required. The SQL string.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type TransactionSelector $transaction
     *           The transaction to use.
     *
     *           For queries, if none is provided, the default is a temporary read-only
     *           transaction with strong concurrency.
     *
     *           Standard DML statements require a read-write transaction. To protect
     *           against replays, single-use transactions are not supported.  The caller
     *           must either supply an existing transaction ID or begin a new transaction.
     *
     *           Partitioned DML requires an existing Partitioned DML transaction ID.
     *     @type Struct $params
     *           Parameter names and values that bind to placeholders in the SQL string.
     *
     *           A parameter placeholder consists of the `&#64;` character followed by the
     *           parameter name (for example, `&#64;firstName`). Parameter names must conform
     *           to the naming requirements of identifiers as specified at
     *           https://cloud.google.com/spanner/docs/lexical#identifiers.
     *
     *           Parameters can appear anywhere that a literal value is expected.  The same
     *           parameter name can be used more than once, for example:
     *
     *           `"WHERE id > &#64;msg_id AND id < &#64;msg_id + 100"`
     *
     *           It is an error to execute a SQL statement with unbound parameters.
     *     @type array $paramTypes
     *           It is not always possible for Cloud Spanner to infer the right SQL type
     *           from a JSON value.  For example, values of type `BYTES` and values
     *           of type `STRING` both appear in
     *           [params][google.spanner.v1.ExecuteSqlRequest.params] as JSON strings.
     *
     *           In these cases, `param_types` can be used to specify the exact
     *           SQL type for some or all of the SQL statement parameters. See the
     *           definition of [Type][google.spanner.v1.Type] for more information
     *           about SQL types.
     *     @type string $resumeToken
     *           If this request is resuming a previously interrupted SQL statement
     *           execution, `resume_token` should be copied from the last
     *           [PartialResultSet][google.spanner.v1.PartialResultSet] yielded before the
     *           interruption. Doing this enables the new SQL statement execution to resume
     *           where the last one left off. The rest of the request parameters must
     *           exactly match the request that yielded this token.
     *     @type int $queryMode
     *           Used to control the amount of debugging information returned in
     *           [ResultSetStats][google.spanner.v1.ResultSetStats]. If
     *           [partition_token][google.spanner.v1.ExecuteSqlRequest.partition_token] is
     *           set, [query_mode][google.spanner.v1.ExecuteSqlRequest.query_mode] can only
     *           be set to
     *           [QueryMode.NORMAL][google.spanner.v1.ExecuteSqlRequest.QueryMode.NORMAL].
     *           For allowed values, use constants defined on {@see \Google\Cloud\Spanner\V1\ExecuteSqlRequest\QueryMode}
     *     @type string $partitionToken
     *           If present, results will be restricted to the specified partition
     *           previously created using PartitionQuery().  There must be an exact
     *           match for the values of fields common to this message and the
     *           PartitionQueryRequest message used to create this partition_token.
     *     @type int $seqno
     *           A per-transaction sequence number used to identify this request. This field
     *           makes each request idempotent such that if the request is received multiple
     *           times, at most one will succeed.
     *
     *           The sequence number must be monotonically increasing within the
     *           transaction. If a request arrives for the first time with an out-of-order
     *           sequence number, the transaction may be aborted. Replays of previously
     *           handled requests will yield the same response as the first execution.
     *
     *           Required for DML statements. Ignored for queries.
     *     @type QueryOptions $queryOptions
     *           Query optimizer configuration to use for the given query.
     *     @type RequestOptions $requestOptions
     *           Common options for this request.
     *     @type DirectedReadOptions $directedReadOptions
     *           Directed read options for this request.
     *     @type bool $dataBoostEnabled
     *           If this is for a partitioned query and this field is set to `true`, the
     *           request is executed with Spanner Data Boost independent compute resources.
     *
     *           If the field is set to `true` but the request does not set
     *           `partition_token`, the API returns an `INVALID_ARGUMENT` error.
     *     @type int $timeoutMillis
     *           Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\ServerStream
     *
     * @throws ApiException if the remote call fails
     */
    public function executeStreamingSql(
        $session,
        $sql,
        array $optionalArgs = []
    ) {
        $request = new ExecuteSqlRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setSql($sql);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['params'])) {
            $request->setParams($optionalArgs['params']);
        }

        if (isset($optionalArgs['paramTypes'])) {
            $request->setParamTypes($optionalArgs['paramTypes']);
        }

        if (isset($optionalArgs['resumeToken'])) {
            $request->setResumeToken($optionalArgs['resumeToken']);
        }

        if (isset($optionalArgs['queryMode'])) {
            $request->setQueryMode($optionalArgs['queryMode']);
        }

        if (isset($optionalArgs['partitionToken'])) {
            $request->setPartitionToken($optionalArgs['partitionToken']);
        }

        if (isset($optionalArgs['seqno'])) {
            $request->setSeqno($optionalArgs['seqno']);
        }

        if (isset($optionalArgs['queryOptions'])) {
            $request->setQueryOptions($optionalArgs['queryOptions']);
        }

        if (isset($optionalArgs['requestOptions'])) {
            $request->setRequestOptions($optionalArgs['requestOptions']);
        }

        if (isset($optionalArgs['directedReadOptions'])) {
            $request->setDirectedReadOptions(
                $optionalArgs['directedReadOptions']
            );
        }

        if (isset($optionalArgs['dataBoostEnabled'])) {
            $request->setDataBoostEnabled($optionalArgs['dataBoostEnabled']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'ExecuteStreamingSql',
            PartialResultSet::class,
            $optionalArgs,
            $request,
            Call::SERVER_STREAMING_CALL
        );
    }

    /**
     * Gets a session. Returns `NOT_FOUND` if the session does not exist.
     * This is mainly useful for determining whether a session is still
     * alive.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedName = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $response = $spannerClient->getSession($formattedName);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $name         Required. The name of the session to retrieve.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\Session
     *
     * @throws ApiException if the remote call fails
     */
    public function getSession($name, array $optionalArgs = [])
    {
        $request = new GetSessionRequest();
        $requestParamHeaders = [];
        $request->setName($name);
        $requestParamHeaders['name'] = $name;
        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'GetSession',
            Session::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Lists all sessions in a given database.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedDatabase = $spannerClient->databaseName('[PROJECT]', '[INSTANCE]', '[DATABASE]');
     *     // Iterate over pages of elements
     *     $pagedResponse = $spannerClient->listSessions($formattedDatabase);
     *     foreach ($pagedResponse->iteratePages() as $page) {
     *         foreach ($page as $element) {
     *             // doSomethingWith($element);
     *         }
     *     }
     *     // Alternatively:
     *     // Iterate through all elements
     *     $pagedResponse = $spannerClient->listSessions($formattedDatabase);
     *     foreach ($pagedResponse->iterateAllElements() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $database     Required. The database in which to list sessions.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type int $pageSize
     *           The maximum number of resources contained in the underlying API
     *           response. The API may return fewer values in a page, even if
     *           there are additional values to be retrieved.
     *     @type string $pageToken
     *           A page token is used to specify a page of values to be returned.
     *           If no page token is specified (the default), the first page
     *           of values will be returned. Any page token used here must have
     *           been generated by a previous call to the API.
     *     @type string $filter
     *           An expression for filtering the results of the request. Filter rules are
     *           case insensitive. The fields eligible for filtering are:
     *
     *           * `labels.key` where key is the name of a label
     *
     *           Some examples of using filters are:
     *
     *           * `labels.env:*` --> The session has the label "env".
     *           * `labels.env:dev` --> The session has the label "env" and the value of
     *           the label contains the string "dev".
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\ApiCore\PagedListResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function listSessions($database, array $optionalArgs = [])
    {
        $request = new ListSessionsRequest();
        $requestParamHeaders = [];
        $request->setDatabase($database);
        $requestParamHeaders['database'] = $database;
        if (isset($optionalArgs['pageSize'])) {
            $request->setPageSize($optionalArgs['pageSize']);
        }

        if (isset($optionalArgs['pageToken'])) {
            $request->setPageToken($optionalArgs['pageToken']);
        }

        if (isset($optionalArgs['filter'])) {
            $request->setFilter($optionalArgs['filter']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->getPagedListResponse(
            'ListSessions',
            $optionalArgs,
            ListSessionsResponse::class,
            $request
        );
    }

    /**
     * Creates a set of partition tokens that can be used to execute a query
     * operation in parallel.  Each of the returned partition tokens can be used
     * by [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql] to
     * specify a subset of the query result to read.  The same session and
     * read-only transaction must be used by the PartitionQueryRequest used to
     * create the partition tokens and the ExecuteSqlRequests that use the
     * partition tokens.
     *
     * Partition tokens become invalid when the session used to create them
     * is deleted, is idle for too long, begins a new transaction, or becomes too
     * old.  When any of these happen, it is not possible to resume the query, and
     * the whole operation must be restarted from the beginning.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $sql = 'sql';
     *     $response = $spannerClient->partitionQuery($formattedSession, $sql);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $session      Required. The session used to create the partitions.
     * @param string $sql          Required. The query request to generate partitions for. The request will
     *                             fail if the query is not root partitionable. For a query to be root
     *                             partitionable, it needs to satisfy a few conditions. For example, the first
     *                             operator in the query execution plan must be a distributed union operator.
     *                             For more information about other conditions, see [Read data in
     *                             parallel](https://cloud.google.com/spanner/docs/reads#read_data_in_parallel).
     *
     *                             The query request must not contain DML commands, such as INSERT, UPDATE, or
     *                             DELETE. Use
     *                             [ExecuteStreamingSql][google.spanner.v1.Spanner.ExecuteStreamingSql] with a
     *                             PartitionedDml transaction for large, partition-friendly DML operations.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type TransactionSelector $transaction
     *           Read only snapshot transactions are supported, read/write and single use
     *           transactions are not.
     *     @type Struct $params
     *           Parameter names and values that bind to placeholders in the SQL string.
     *
     *           A parameter placeholder consists of the `&#64;` character followed by the
     *           parameter name (for example, `&#64;firstName`). Parameter names can contain
     *           letters, numbers, and underscores.
     *
     *           Parameters can appear anywhere that a literal value is expected.  The same
     *           parameter name can be used more than once, for example:
     *
     *           `"WHERE id > &#64;msg_id AND id < &#64;msg_id + 100"`
     *
     *           It is an error to execute a SQL statement with unbound parameters.
     *     @type array $paramTypes
     *           It is not always possible for Cloud Spanner to infer the right SQL type
     *           from a JSON value.  For example, values of type `BYTES` and values
     *           of type `STRING` both appear in
     *           [params][google.spanner.v1.PartitionQueryRequest.params] as JSON strings.
     *
     *           In these cases, `param_types` can be used to specify the exact
     *           SQL type for some or all of the SQL query parameters. See the
     *           definition of [Type][google.spanner.v1.Type] for more information
     *           about SQL types.
     *     @type PartitionOptions $partitionOptions
     *           Additional options that affect how many partitions are created.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\PartitionResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function partitionQuery($session, $sql, array $optionalArgs = [])
    {
        $request = new PartitionQueryRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setSql($sql);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['params'])) {
            $request->setParams($optionalArgs['params']);
        }

        if (isset($optionalArgs['paramTypes'])) {
            $request->setParamTypes($optionalArgs['paramTypes']);
        }

        if (isset($optionalArgs['partitionOptions'])) {
            $request->setPartitionOptions($optionalArgs['partitionOptions']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'PartitionQuery',
            PartitionResponse::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Creates a set of partition tokens that can be used to execute a read
     * operation in parallel.  Each of the returned partition tokens can be used
     * by [StreamingRead][google.spanner.v1.Spanner.StreamingRead] to specify a
     * subset of the read result to read.  The same session and read-only
     * transaction must be used by the PartitionReadRequest used to create the
     * partition tokens and the ReadRequests that use the partition tokens.  There
     * are no ordering guarantees on rows returned among the returned partition
     * tokens, or even within each individual StreamingRead call issued with a
     * partition_token.
     *
     * Partition tokens become invalid when the session used to create them
     * is deleted, is idle for too long, begins a new transaction, or becomes too
     * old.  When any of these happen, it is not possible to resume the read, and
     * the whole operation must be restarted from the beginning.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $table = 'table';
     *     $keySet = new KeySet();
     *     $response = $spannerClient->partitionRead($formattedSession, $table, $keySet);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $session      Required. The session used to create the partitions.
     * @param string $table        Required. The name of the table in the database to be read.
     * @param KeySet $keySet       Required. `key_set` identifies the rows to be yielded. `key_set` names the
     *                             primary keys of the rows in
     *                             [table][google.spanner.v1.PartitionReadRequest.table] to be yielded, unless
     *                             [index][google.spanner.v1.PartitionReadRequest.index] is present. If
     *                             [index][google.spanner.v1.PartitionReadRequest.index] is present, then
     *                             [key_set][google.spanner.v1.PartitionReadRequest.key_set] instead names
     *                             index keys in [index][google.spanner.v1.PartitionReadRequest.index].
     *
     *                             It is not an error for the `key_set` to name rows that do not
     *                             exist in the database. Read yields nothing for nonexistent rows.
     * @param array  $optionalArgs {
     *     Optional.
     *
     *     @type TransactionSelector $transaction
     *           Read only snapshot transactions are supported, read/write and single use
     *           transactions are not.
     *     @type string $index
     *           If non-empty, the name of an index on
     *           [table][google.spanner.v1.PartitionReadRequest.table]. This index is used
     *           instead of the table primary key when interpreting
     *           [key_set][google.spanner.v1.PartitionReadRequest.key_set] and sorting
     *           result rows. See [key_set][google.spanner.v1.PartitionReadRequest.key_set]
     *           for further information.
     *     @type string[] $columns
     *           The columns of [table][google.spanner.v1.PartitionReadRequest.table] to be
     *           returned for each row matching this request.
     *     @type PartitionOptions $partitionOptions
     *           Additional options that affect how many partitions are created.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\PartitionResponse
     *
     * @throws ApiException if the remote call fails
     */
    public function partitionRead(
        $session,
        $table,
        $keySet,
        array $optionalArgs = []
    ) {
        $request = new PartitionReadRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setTable($table);
        $request->setKeySet($keySet);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['index'])) {
            $request->setIndex($optionalArgs['index']);
        }

        if (isset($optionalArgs['columns'])) {
            $request->setColumns($optionalArgs['columns']);
        }

        if (isset($optionalArgs['partitionOptions'])) {
            $request->setPartitionOptions($optionalArgs['partitionOptions']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'PartitionRead',
            PartitionResponse::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Reads rows from the database using key lookups and scans, as a
     * simple key/value style alternative to
     * [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql].  This method cannot be
     * used to return a result set larger than 10 MiB; if the read matches more
     * data than that, the read fails with a `FAILED_PRECONDITION`
     * error.
     *
     * Reads inside read-write transactions might return `ABORTED`. If
     * this occurs, the application should restart the transaction from
     * the beginning. See [Transaction][google.spanner.v1.Transaction] for more
     * details.
     *
     * Larger result sets can be yielded in streaming fashion by calling
     * [StreamingRead][google.spanner.v1.Spanner.StreamingRead] instead.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $table = 'table';
     *     $columns = [];
     *     $keySet = new KeySet();
     *     $response = $spannerClient->read($formattedSession, $table, $columns, $keySet);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string   $session      Required. The session in which the read should be performed.
     * @param string   $table        Required. The name of the table in the database to be read.
     * @param string[] $columns      Required. The columns of [table][google.spanner.v1.ReadRequest.table] to be
     *                               returned for each row matching this request.
     * @param KeySet   $keySet       Required. `key_set` identifies the rows to be yielded. `key_set` names the
     *                               primary keys of the rows in [table][google.spanner.v1.ReadRequest.table] to
     *                               be yielded, unless [index][google.spanner.v1.ReadRequest.index] is present.
     *                               If [index][google.spanner.v1.ReadRequest.index] is present, then
     *                               [key_set][google.spanner.v1.ReadRequest.key_set] instead names index keys
     *                               in [index][google.spanner.v1.ReadRequest.index].
     *
     *                               If the [partition_token][google.spanner.v1.ReadRequest.partition_token]
     *                               field is empty, rows are yielded in table primary key order (if
     *                               [index][google.spanner.v1.ReadRequest.index] is empty) or index key order
     *                               (if [index][google.spanner.v1.ReadRequest.index] is non-empty).  If the
     *                               [partition_token][google.spanner.v1.ReadRequest.partition_token] field is
     *                               not empty, rows will be yielded in an unspecified order.
     *
     *                               It is not an error for the `key_set` to name rows that do not
     *                               exist in the database. Read yields nothing for nonexistent rows.
     * @param array    $optionalArgs {
     *     Optional.
     *
     *     @type TransactionSelector $transaction
     *           The transaction to use. If none is provided, the default is a
     *           temporary read-only transaction with strong concurrency.
     *     @type string $index
     *           If non-empty, the name of an index on
     *           [table][google.spanner.v1.ReadRequest.table]. This index is used instead of
     *           the table primary key when interpreting
     *           [key_set][google.spanner.v1.ReadRequest.key_set] and sorting result rows.
     *           See [key_set][google.spanner.v1.ReadRequest.key_set] for further
     *           information.
     *     @type int $limit
     *           If greater than zero, only the first `limit` rows are yielded. If `limit`
     *           is zero, the default is no limit. A limit cannot be specified if
     *           `partition_token` is set.
     *     @type string $resumeToken
     *           If this request is resuming a previously interrupted read,
     *           `resume_token` should be copied from the last
     *           [PartialResultSet][google.spanner.v1.PartialResultSet] yielded before the
     *           interruption. Doing this enables the new read to resume where the last read
     *           left off. The rest of the request parameters must exactly match the request
     *           that yielded this token.
     *     @type string $partitionToken
     *           If present, results will be restricted to the specified partition
     *           previously created using PartitionRead().    There must be an exact
     *           match for the values of fields common to this message and the
     *           PartitionReadRequest message used to create this partition_token.
     *     @type RequestOptions $requestOptions
     *           Common options for this request.
     *     @type DirectedReadOptions $directedReadOptions
     *           Directed read options for this request.
     *     @type bool $dataBoostEnabled
     *           If this is for a partitioned read and this field is set to `true`, the
     *           request is executed with Spanner Data Boost independent compute resources.
     *
     *           If the field is set to `true` but the request does not set
     *           `partition_token`, the API returns an `INVALID_ARGUMENT` error.
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Spanner\V1\ResultSet
     *
     * @throws ApiException if the remote call fails
     */
    public function read(
        $session,
        $table,
        $columns,
        $keySet,
        array $optionalArgs = []
    ) {
        $request = new ReadRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setTable($table);
        $request->setColumns($columns);
        $request->setKeySet($keySet);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['index'])) {
            $request->setIndex($optionalArgs['index']);
        }

        if (isset($optionalArgs['limit'])) {
            $request->setLimit($optionalArgs['limit']);
        }

        if (isset($optionalArgs['resumeToken'])) {
            $request->setResumeToken($optionalArgs['resumeToken']);
        }

        if (isset($optionalArgs['partitionToken'])) {
            $request->setPartitionToken($optionalArgs['partitionToken']);
        }

        if (isset($optionalArgs['requestOptions'])) {
            $request->setRequestOptions($optionalArgs['requestOptions']);
        }

        if (isset($optionalArgs['directedReadOptions'])) {
            $request->setDirectedReadOptions(
                $optionalArgs['directedReadOptions']
            );
        }

        if (isset($optionalArgs['dataBoostEnabled'])) {
            $request->setDataBoostEnabled($optionalArgs['dataBoostEnabled']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'Read',
            ResultSet::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Rolls back a transaction, releasing any locks it holds. It is a good
     * idea to call this for any transaction that includes one or more
     * [Read][google.spanner.v1.Spanner.Read] or
     * [ExecuteSql][google.spanner.v1.Spanner.ExecuteSql] requests and ultimately
     * decides not to commit.
     *
     * `Rollback` returns `OK` if it successfully aborts the transaction, the
     * transaction was already aborted, or the transaction is not
     * found. `Rollback` never returns `ABORTED`.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $transactionId = '...';
     *     $spannerClient->rollback($formattedSession, $transactionId);
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string $session       Required. The session in which the transaction to roll back is running.
     * @param string $transactionId Required. The transaction to roll back.
     * @param array  $optionalArgs  {
     *     Optional.
     *
     *     @type RetrySettings|array $retrySettings
     *           Retry settings to use for this call. Can be a {@see RetrySettings} object, or an
     *           associative array of retry settings parameters. See the documentation on
     *           {@see RetrySettings} for example usage.
     * }
     *
     * @throws ApiException if the remote call fails
     */
    public function rollback($session, $transactionId, array $optionalArgs = [])
    {
        $request = new RollbackRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setTransactionId($transactionId);
        $requestParamHeaders['session'] = $session;
        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'Rollback',
            GPBEmpty::class,
            $optionalArgs,
            $request
        )->wait();
    }

    /**
     * Like [Read][google.spanner.v1.Spanner.Read], except returns the result set
     * as a stream. Unlike [Read][google.spanner.v1.Spanner.Read], there is no
     * limit on the size of the returned result set. However, no individual row in
     * the result set can exceed 100 MiB, and no column value can exceed
     * 10 MiB.
     *
     * Sample code:
     * ```
     * $spannerClient = new SpannerClient();
     * try {
     *     $formattedSession = $spannerClient->sessionName('[PROJECT]', '[INSTANCE]', '[DATABASE]', '[SESSION]');
     *     $table = 'table';
     *     $columns = [];
     *     $keySet = new KeySet();
     *     // Read all responses until the stream is complete
     *     $stream = $spannerClient->streamingRead($formattedSession, $table, $columns, $keySet);
     *     foreach ($stream->readAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $spannerClient->close();
     * }
     * ```
     *
     * @param string   $session      Required. The session in which the read should be performed.
     * @param string   $table        Required. The name of the table in the database to be read.
     * @param string[] $columns      Required. The columns of [table][google.spanner.v1.ReadRequest.table] to be
     *                               returned for each row matching this request.
     * @param KeySet   $keySet       Required. `key_set` identifies the rows to be yielded. `key_set` names the
     *                               primary keys of the rows in [table][google.spanner.v1.ReadRequest.table] to
     *                               be yielded, unless [index][google.spanner.v1.ReadRequest.index] is present.
     *                               If [index][google.spanner.v1.ReadRequest.index] is present, then
     *                               [key_set][google.spanner.v1.ReadRequest.key_set] instead names index keys
     *                               in [index][google.spanner.v1.ReadRequest.index].
     *
     *                               If the [partition_token][google.spanner.v1.ReadRequest.partition_token]
     *                               field is empty, rows are yielded in table primary key order (if
     *                               [index][google.spanner.v1.ReadRequest.index] is empty) or index key order
     *                               (if [index][google.spanner.v1.ReadRequest.index] is non-empty).  If the
     *                               [partition_token][google.spanner.v1.ReadRequest.partition_token] field is
     *                               not empty, rows will be yielded in an unspecified order.
     *
     *                               It is not an error for the `key_set` to name rows that do not
     *                               exist in the database. Read yields nothing for nonexistent rows.
     * @param array    $optionalArgs {
     *     Optional.
     *
     *     @type TransactionSelector $transaction
     *           The transaction to use. If none is provided, the default is a
     *           temporary read-only transaction with strong concurrency.
     *     @type string $index
     *           If non-empty, the name of an index on
     *           [table][google.spanner.v1.ReadRequest.table]. This index is used instead of
     *           the table primary key when interpreting
     *           [key_set][google.spanner.v1.ReadRequest.key_set] and sorting result rows.
     *           See [key_set][google.spanner.v1.ReadRequest.key_set] for further
     *           information.
     *     @type int $limit
     *           If greater than zero, only the first `limit` rows are yielded. If `limit`
     *           is zero, the default is no limit. A limit cannot be specified if
     *           `partition_token` is set.
     *     @type string $resumeToken
     *           If this request is resuming a previously interrupted read,
     *           `resume_token` should be copied from the last
     *           [PartialResultSet][google.spanner.v1.PartialResultSet] yielded before the
     *           interruption. Doing this enables the new read to resume where the last read
     *           left off. The rest of the request parameters must exactly match the request
     *           that yielded this token.
     *     @type string $partitionToken
     *           If present, results will be restricted to the specified partition
     *           previously created using PartitionRead().    There must be an exact
     *           match for the values of fields common to this message and the
     *           PartitionReadRequest message used to create this partition_token.
     *     @type RequestOptions $requestOptions
     *           Common options for this request.
     *     @type DirectedReadOptions $directedReadOptions
     *           Directed read options for this request.
     *     @type bool $dataBoostEnabled
     *           If this is for a partitioned read and this field is set to `true`, the
     *           request is executed with Spanner Data Boost independent compute resources.
     *
     *           If the field is set to `true` but the request does not set
     *           `partition_token`, the API returns an `INVALID_ARGUMENT` error.
     *     @type int $timeoutMillis
     *           Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\ServerStream
     *
     * @throws ApiException if the remote call fails
     */
    public function streamingRead(
        $session,
        $table,
        $columns,
        $keySet,
        array $optionalArgs = []
    ) {
        $request = new ReadRequest();
        $requestParamHeaders = [];
        $request->setSession($session);
        $request->setTable($table);
        $request->setColumns($columns);
        $request->setKeySet($keySet);
        $requestParamHeaders['session'] = $session;
        if (isset($optionalArgs['transaction'])) {
            $request->setTransaction($optionalArgs['transaction']);
        }

        if (isset($optionalArgs['index'])) {
            $request->setIndex($optionalArgs['index']);
        }

        if (isset($optionalArgs['limit'])) {
            $request->setLimit($optionalArgs['limit']);
        }

        if (isset($optionalArgs['resumeToken'])) {
            $request->setResumeToken($optionalArgs['resumeToken']);
        }

        if (isset($optionalArgs['partitionToken'])) {
            $request->setPartitionToken($optionalArgs['partitionToken']);
        }

        if (isset($optionalArgs['requestOptions'])) {
            $request->setRequestOptions($optionalArgs['requestOptions']);
        }

        if (isset($optionalArgs['directedReadOptions'])) {
            $request->setDirectedReadOptions(
                $optionalArgs['directedReadOptions']
            );
        }

        if (isset($optionalArgs['dataBoostEnabled'])) {
            $request->setDataBoostEnabled($optionalArgs['dataBoostEnabled']);
        }

        $requestParams = new RequestParamsHeaderDescriptor(
            $requestParamHeaders
        );
        $optionalArgs['headers'] = isset($optionalArgs['headers'])
            ? array_merge($requestParams->getHeader(), $optionalArgs['headers'])
            : $requestParams->getHeader();
        return $this->startCall(
            'StreamingRead',
            PartialResultSet::class,
            $optionalArgs,
            $request,
            Call::SERVER_STREAMING_CALL
        );
    }
}
