<?php
/*
 * Copyright 2017, Google LLC All rights reserved.
 *
 * 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
 *
 *     http://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
 * This file was generated from the file
 * https://github.com/google/googleapis/blob/master/google/bigtable/v2/bigtable.proto
 * and updates to that file get reflected here through a refresh process.
 *
 * EXPERIMENTAL: this client library class has not yet been declared beta. This class may change
 * more frequently than those which have been declared beta or 1.0, including changes which break
 * backwards compatibility.
 *
 * @experimental
 */

namespace Google\Cloud\Bigtable\V2\Gapic;

use Google\ApiCore\AgentHeaderDescriptor;
use Google\ApiCore\ApiCallable;
use Google\ApiCore\CallSettings;
use Google\ApiCore\GrpcCredentialsHelper;
use Google\ApiCore\PathTemplate;
use Google\ApiCore\ValidationException;
use Google\Cloud\Bigtable\V2\BigtableGrpcClient;
use Google\Cloud\Bigtable\V2\CheckAndMutateRowRequest;
use Google\Cloud\Bigtable\V2\MutateRowRequest;
use Google\Cloud\Bigtable\V2\MutateRowsRequest;
use Google\Cloud\Bigtable\V2\MutateRowsRequest_Entry as Entry;
use Google\Cloud\Bigtable\V2\Mutation;
use Google\Cloud\Bigtable\V2\ReadModifyWriteRowRequest;
use Google\Cloud\Bigtable\V2\ReadModifyWriteRule;
use Google\Cloud\Bigtable\V2\ReadRowsRequest;
use Google\Cloud\Bigtable\V2\RowFilter;
use Google\Cloud\Bigtable\V2\RowSet;
use Google\Cloud\Bigtable\V2\SampleRowKeysRequest;
use Google\Cloud\Version;

/**
 * Service Description: Service for reading from and writing to existing Bigtable tables.
 *
 * EXPERIMENTAL: this client library class has not yet been declared beta. This class may change
 * more frequently than those which have been declared beta or 1.0, including changes which break
 * backwards compatibility.
 *
 * 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:
 *
 * ```
 * try {
 *     $bigtableClient = new BigtableClient();
 *     $formattedTableName = $bigtableClient->tableName('[PROJECT]', '[INSTANCE]', '[TABLE]');
 *     // Read all responses until the stream is complete
 *     $stream = $bigtableClient->readRows($formattedTableName);
 *     foreach ($stream->readAll() as $element) {
 *         // doSomethingWith($element);
 *     }
 * } finally {
 *     $bigtableClient->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.
 *
 * @experimental
 */
class BigtableGapicClient
{
    /**
     * The default address of the service.
     */
    const SERVICE_ADDRESS = 'bigtable.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 code generator version, to be included in the agent header.
     */
    const CODEGEN_VERSION = '0.0.5';

    private static $tableNameTemplate;
    private static $pathTemplateMap;
    private static $gapicVersion;
    private static $gapicVersionLoaded = false;

    protected $grpcCredentialsHelper;
    protected $bigtableStub;
    private $scopes;
    private $defaultCallSettings;
    private $descriptors;

    private static function getTableNameTemplate()
    {
        if (self::$tableNameTemplate == null) {
            self::$tableNameTemplate = new PathTemplate('projects/{project}/instances/{instance}/tables/{table}');
        }

        return self::$tableNameTemplate;
    }

    private static function getPathTemplateMap()
    {
        if (self::$pathTemplateMap == null) {
            self::$pathTemplateMap = [
                'table' => self::getTableNameTemplate(),
            ];
        }

        return self::$pathTemplateMap;
    }

    private static function getGrpcStreamingDescriptors()
    {
        return [
            'readRows' => [
                'grpcStreamingType' => 'ServerStreaming',
            ],
            'sampleRowKeys' => [
                'grpcStreamingType' => 'ServerStreaming',
            ],
            'mutateRows' => [
                'grpcStreamingType' => 'ServerStreaming',
            ],
        ];
    }

    private static function getGapicVersion()
    {
        if (!self::$gapicVersionLoaded) {
            if (file_exists(__DIR__.'/../VERSION')) {
                self::$gapicVersion = trim(file_get_contents(__DIR__.'/../VERSION'));
            } elseif (class_exists(Version::class)) {
                self::$gapicVersion = Version::VERSION;
            }
            self::$gapicVersionLoaded = true;
        }

        return self::$gapicVersion;
    }

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

    /**
     * Parses a formatted name string and returns an associative array of the components in the name.
     * The following name formats are supported:
     * Template: Pattern
     * - table: projects/{project}/instances/{instance}/tables/{table}.
     *
     * 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 $formattedName could not be matched.
     * @experimental
     */
    public static function parseName($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 $serviceAddress The domain name of the API remote host.
     *                                  Default 'bigtable.googleapis.com'.
     *     @type mixed $port The port on which to connect to the remote host. Default 443.
     *     @type \Grpc\Channel $channel
     *           A `Channel` object to be used by gRPC. If not specified, a channel will be constructed.
     *     @type \Grpc\ChannelCredentials $sslCreds
     *           A `ChannelCredentials` object for use with an SSL-enabled channel.
     *           Default: a credentials object returned from
     *           \Grpc\ChannelCredentials::createSsl()
     *           NOTE: if the $channel optional argument is specified, then this argument is unused.
     *     @type bool $forceNewChannel
     *           If true, this forces gRPC to create a new channel instead of using a persistent channel.
     *           Defaults to false.
     *           NOTE: if the $channel optional argument is specified, then this option is unused.
     *     @type \Google\Auth\CredentialsLoader $credentialsLoader
     *           A CredentialsLoader object created using the Google\Auth library.
     *     @type array $scopes A string array of scopes to use when acquiring credentials.
     *                          Defaults to the scopes for the Google Cloud Bigtable API.
     *     @type string $clientConfigPath
     *           Path to a JSON file containing client method configuration, including retry settings.
     *           Specify this setting to specify the retry behavior of all methods on the client.
     *           By default this settings points to the default client config file, which is provided
     *           in the resources folder. The retry settings provided in this option can be overridden
     *           by settings in $retryingOverride
     *     @type array $retryingOverride
     *           An associative array in which the keys are method names (e.g. 'createFoo'), and
     *           the values are retry settings to use for that method. The retry settings for each
     *           method can be a {@see Google\ApiCore\RetrySettings} object, or an associative array
     *           of retry settings parameters. See the documentation on {@see Google\ApiCore\RetrySettings}
     *           for example usage. Passing a value of null is equivalent to a value of
     *           ['retriesEnabled' => false]. Retry settings provided in this setting override the
     *           settings in $clientConfigPath.
     * }
     * @experimental
     */
    public function __construct($options = [])
    {
        $defaultOptions = [
            'serviceAddress' => self::SERVICE_ADDRESS,
            'port' => self::DEFAULT_SERVICE_PORT,
            'scopes' => [
                'https://www.googleapis.com/auth/bigtable.data',
                'https://www.googleapis.com/auth/bigtable.data.readonly',
                'https://www.googleapis.com/auth/cloud-bigtable.data',
                'https://www.googleapis.com/auth/cloud-bigtable.data.readonly',
                'https://www.googleapis.com/auth/cloud-platform',
                'https://www.googleapis.com/auth/cloud-platform.read-only',
            ],
            'retryingOverride' => null,
            'libName' => null,
            'libVersion' => null,
            'clientConfigPath' => __DIR__.'/../resources/bigtable_client_config.json',
        ];
        $options = array_merge($defaultOptions, $options);

        $gapicVersion = $options['libVersion'] ?: self::getGapicVersion();

        $headerDescriptor = new AgentHeaderDescriptor([
            'libName' => $options['libName'],
            'libVersion' => $options['libVersion'],
            'gapicVersion' => $gapicVersion,
        ]);

        $defaultDescriptors = ['headerDescriptor' => $headerDescriptor];
        $this->descriptors = [
            'readRows' => $defaultDescriptors,
            'sampleRowKeys' => $defaultDescriptors,
            'mutateRow' => $defaultDescriptors,
            'mutateRows' => $defaultDescriptors,
            'checkAndMutateRow' => $defaultDescriptors,
            'readModifyWriteRow' => $defaultDescriptors,
        ];
        $grpcStreamingDescriptors = self::getGrpcStreamingDescriptors();
        foreach ($grpcStreamingDescriptors as $method => $grpcStreamingDescriptor) {
            $this->descriptors[$method]['grpcStreamingDescriptor'] = $grpcStreamingDescriptor;
        }

        $clientConfigJsonString = file_get_contents($options['clientConfigPath']);
        $clientConfig = json_decode($clientConfigJsonString, true);
        $this->defaultCallSettings =
                CallSettings::load(
                    'google.bigtable.v2.Bigtable',
                    $clientConfig,
                    $options['retryingOverride']
                );

        $this->scopes = $options['scopes'];

        $createStubOptions = [];
        if (array_key_exists('sslCreds', $options)) {
            $createStubOptions['sslCreds'] = $options['sslCreds'];
        }
        $this->grpcCredentialsHelper = new GrpcCredentialsHelper($options);

        $createBigtableStubFunction = function ($hostname, $opts, $channel) {
            return new BigtableGrpcClient($hostname, $opts, $channel);
        };
        if (array_key_exists('createBigtableStubFunction', $options)) {
            $createBigtableStubFunction = $options['createBigtableStubFunction'];
        }
        $this->bigtableStub = $this->grpcCredentialsHelper->createStub($createBigtableStubFunction);
    }

    /**
     * Streams back the contents of all requested rows in key order, optionally
     * applying the same Reader filter to each. Depending on their size,
     * rows and cells may be broken up across multiple responses, but
     * atomicity of each row will still be preserved. See the
     * ReadRowsResponse documentation for details.
     *
     * Sample code:
     * ```
     * try {
     *     $bigtableClient = new BigtableClient();
     *     $formattedTableName = $bigtableClient->tableName('[PROJECT]', '[INSTANCE]', '[TABLE]');
     *     // Read all responses until the stream is complete
     *     $stream = $bigtableClient->readRows($formattedTableName);
     *     foreach ($stream->readAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $bigtableClient->close();
     * }
     * ```
     *
     * @param string $tableName    The unique name of the table from which to read.
     *                             Values are of the form
     *                             `projects/<project>/instances/<instance>/tables/<table>`.
     * @param array  $optionalArgs {
     *                             Optional.
     *
     *     @type RowSet $rows
     *          The row keys and/or ranges to read. If not specified, reads from all rows.
     *     @type RowFilter $filter
     *          The filter to apply to the contents of the specified row(s). If unset,
     *          reads the entirety of each row.
     *     @type int $rowsLimit
     *          The read will terminate after committing to N rows' worth of results. The
     *          default (zero) is to return all results.
     *     @type int $timeoutMillis
     *          Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\ServerStream
     *
     * @throws \Google\ApiCore\ApiException if the remote call fails
     * @experimental
     */
    public function readRows($tableName, $optionalArgs = [])
    {
        $request = new ReadRowsRequest();
        $request->setTableName($tableName);
        if (isset($optionalArgs['rows'])) {
            $request->setRows($optionalArgs['rows']);
        }
        if (isset($optionalArgs['filter'])) {
            $request->setFilter($optionalArgs['filter']);
        }
        if (isset($optionalArgs['rowsLimit'])) {
            $request->setRowsLimit($optionalArgs['rowsLimit']);
        }

        if (array_key_exists('timeoutMillis', $optionalArgs)) {
            $optionalArgs['retrySettings'] = [
                'retriesEnabled' => false,
                'noRetriesRpcTimeoutMillis' => $optionalArgs['timeoutMillis'],
            ];
        }

        $defaultCallSettings = $this->defaultCallSettings['readRows'];
        if (isset($optionalArgs['retrySettings']) && is_array($optionalArgs['retrySettings'])) {
            $optionalArgs['retrySettings'] = $defaultCallSettings->getRetrySettings()->with(
                $optionalArgs['retrySettings']
            );
        }
        $mergedSettings = $defaultCallSettings->merge(new CallSettings($optionalArgs));
        $callable = ApiCallable::createApiCall(
            $this->bigtableStub,
            'ReadRows',
            $mergedSettings,
            $this->descriptors['readRows']
        );

        return $callable(
            $request,
            [],
            ['call_credentials_callback' => $this->createCredentialsCallback()]);
    }

    /**
     * Returns a sample of row keys in the table. The returned row keys will
     * delimit contiguous sections of the table of approximately equal size,
     * which can be used to break up the data for distributed tasks like
     * mapreduces.
     *
     * Sample code:
     * ```
     * try {
     *     $bigtableClient = new BigtableClient();
     *     $formattedTableName = $bigtableClient->tableName('[PROJECT]', '[INSTANCE]', '[TABLE]');
     *     // Read all responses until the stream is complete
     *     $stream = $bigtableClient->sampleRowKeys($formattedTableName);
     *     foreach ($stream->readAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $bigtableClient->close();
     * }
     * ```
     *
     * @param string $tableName    The unique name of the table from which to sample row keys.
     *                             Values are of the form
     *                             `projects/<project>/instances/<instance>/tables/<table>`.
     * @param array  $optionalArgs {
     *                             Optional.
     *
     *     @type int $timeoutMillis
     *          Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\ServerStream
     *
     * @throws \Google\ApiCore\ApiException if the remote call fails
     * @experimental
     */
    public function sampleRowKeys($tableName, $optionalArgs = [])
    {
        $request = new SampleRowKeysRequest();
        $request->setTableName($tableName);

        if (array_key_exists('timeoutMillis', $optionalArgs)) {
            $optionalArgs['retrySettings'] = [
                'retriesEnabled' => false,
                'noRetriesRpcTimeoutMillis' => $optionalArgs['timeoutMillis'],
            ];
        }

        $defaultCallSettings = $this->defaultCallSettings['sampleRowKeys'];
        if (isset($optionalArgs['retrySettings']) && is_array($optionalArgs['retrySettings'])) {
            $optionalArgs['retrySettings'] = $defaultCallSettings->getRetrySettings()->with(
                $optionalArgs['retrySettings']
            );
        }
        $mergedSettings = $defaultCallSettings->merge(new CallSettings($optionalArgs));
        $callable = ApiCallable::createApiCall(
            $this->bigtableStub,
            'SampleRowKeys',
            $mergedSettings,
            $this->descriptors['sampleRowKeys']
        );

        return $callable(
            $request,
            [],
            ['call_credentials_callback' => $this->createCredentialsCallback()]);
    }

    /**
     * Mutates a row atomically. Cells already present in the row are left
     * unchanged unless explicitly changed by `mutation`.
     *
     * Sample code:
     * ```
     * try {
     *     $bigtableClient = new BigtableClient();
     *     $formattedTableName = $bigtableClient->tableName('[PROJECT]', '[INSTANCE]', '[TABLE]');
     *     $rowKey = '';
     *     $mutations = [];
     *     $response = $bigtableClient->mutateRow($formattedTableName, $rowKey, $mutations);
     * } finally {
     *     $bigtableClient->close();
     * }
     * ```
     *
     * @param string     $tableName    The unique name of the table to which the mutation should be applied.
     *                                 Values are of the form
     *                                 `projects/<project>/instances/<instance>/tables/<table>`.
     * @param string     $rowKey       The key of the row to which the mutation should be applied.
     * @param Mutation[] $mutations    Changes to be atomically applied to the specified row. Entries are applied
     *                                 in order, meaning that earlier mutations can be masked by later ones.
     *                                 Must contain at least one entry and at most 100000.
     * @param array      $optionalArgs {
     *                                 Optional.
     *
     *     @type \Google\ApiCore\RetrySettings|array $retrySettings
     *          Retry settings to use for this call. Can be a
     *          {@see Google\ApiCore\RetrySettings} object, or an associative array
     *          of retry settings parameters. See the documentation on
     *          {@see Google\ApiCore\RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Bigtable\V2\MutateRowResponse
     *
     * @throws \Google\ApiCore\ApiException if the remote call fails
     * @experimental
     */
    public function mutateRow($tableName, $rowKey, $mutations, $optionalArgs = [])
    {
        $request = new MutateRowRequest();
        $request->setTableName($tableName);
        $request->setRowKey($rowKey);
        $request->setMutations($mutations);

        $defaultCallSettings = $this->defaultCallSettings['mutateRow'];
        if (isset($optionalArgs['retrySettings']) && is_array($optionalArgs['retrySettings'])) {
            $optionalArgs['retrySettings'] = $defaultCallSettings->getRetrySettings()->with(
                $optionalArgs['retrySettings']
            );
        }
        $mergedSettings = $defaultCallSettings->merge(new CallSettings($optionalArgs));
        $callable = ApiCallable::createApiCall(
            $this->bigtableStub,
            'MutateRow',
            $mergedSettings,
            $this->descriptors['mutateRow']
        );

        return $callable(
            $request,
            [],
            ['call_credentials_callback' => $this->createCredentialsCallback()]);
    }

    /**
     * Mutates multiple rows in a batch. Each individual row is mutated
     * atomically as in MutateRow, but the entire batch is not executed
     * atomically.
     *
     * Sample code:
     * ```
     * try {
     *     $bigtableClient = new BigtableClient();
     *     $formattedTableName = $bigtableClient->tableName('[PROJECT]', '[INSTANCE]', '[TABLE]');
     *     $entries = [];
     *     // Read all responses until the stream is complete
     *     $stream = $bigtableClient->mutateRows($formattedTableName, $entries);
     *     foreach ($stream->readAll() as $element) {
     *         // doSomethingWith($element);
     *     }
     * } finally {
     *     $bigtableClient->close();
     * }
     * ```
     *
     * @param string  $tableName    The unique name of the table to which the mutations should be applied.
     * @param Entry[] $entries      The row keys and corresponding mutations to be applied in bulk.
     *                              Each entry is applied as an atomic mutation, but the entries may be
     *                              applied in arbitrary order (even between entries for the same row).
     *                              At least one entry must be specified, and in total the entries can
     *                              contain at most 100000 mutations.
     * @param array   $optionalArgs {
     *                              Optional.
     *
     *     @type int $timeoutMillis
     *          Timeout to use for this call.
     * }
     *
     * @return \Google\ApiCore\ServerStream
     *
     * @throws \Google\ApiCore\ApiException if the remote call fails
     * @experimental
     */
    public function mutateRows($tableName, $entries, $optionalArgs = [])
    {
        $request = new MutateRowsRequest();
        $request->setTableName($tableName);
        $request->setEntries($entries);

        if (array_key_exists('timeoutMillis', $optionalArgs)) {
            $optionalArgs['retrySettings'] = [
                'retriesEnabled' => false,
                'noRetriesRpcTimeoutMillis' => $optionalArgs['timeoutMillis'],
            ];
        }

        $defaultCallSettings = $this->defaultCallSettings['mutateRows'];
        if (isset($optionalArgs['retrySettings']) && is_array($optionalArgs['retrySettings'])) {
            $optionalArgs['retrySettings'] = $defaultCallSettings->getRetrySettings()->with(
                $optionalArgs['retrySettings']
            );
        }
        $mergedSettings = $defaultCallSettings->merge(new CallSettings($optionalArgs));
        $callable = ApiCallable::createApiCall(
            $this->bigtableStub,
            'MutateRows',
            $mergedSettings,
            $this->descriptors['mutateRows']
        );

        return $callable(
            $request,
            [],
            ['call_credentials_callback' => $this->createCredentialsCallback()]);
    }

    /**
     * Mutates a row atomically based on the output of a predicate Reader filter.
     *
     * Sample code:
     * ```
     * try {
     *     $bigtableClient = new BigtableClient();
     *     $formattedTableName = $bigtableClient->tableName('[PROJECT]', '[INSTANCE]', '[TABLE]');
     *     $rowKey = '';
     *     $response = $bigtableClient->checkAndMutateRow($formattedTableName, $rowKey);
     * } finally {
     *     $bigtableClient->close();
     * }
     * ```
     *
     * @param string $tableName    The unique name of the table to which the conditional mutation should be
     *                             applied.
     *                             Values are of the form
     *                             `projects/<project>/instances/<instance>/tables/<table>`.
     * @param string $rowKey       The key of the row to which the conditional mutation should be applied.
     * @param array  $optionalArgs {
     *                             Optional.
     *
     *     @type RowFilter $predicateFilter
     *          The filter to be applied to the contents of the specified row. Depending
     *          on whether or not any results are yielded, either `true_mutations` or
     *          `false_mutations` will be executed. If unset, checks that the row contains
     *          any values at all.
     *     @type Mutation[] $trueMutations
     *          Changes to be atomically applied to the specified row if `predicate_filter`
     *          yields at least one cell when applied to `row_key`. Entries are applied in
     *          order, meaning that earlier mutations can be masked by later ones.
     *          Must contain at least one entry if `false_mutations` is empty, and at most
     *          100000.
     *     @type Mutation[] $falseMutations
     *          Changes to be atomically applied to the specified row if `predicate_filter`
     *          does not yield any cells when applied to `row_key`. Entries are applied in
     *          order, meaning that earlier mutations can be masked by later ones.
     *          Must contain at least one entry if `true_mutations` is empty, and at most
     *          100000.
     *     @type \Google\ApiCore\RetrySettings|array $retrySettings
     *          Retry settings to use for this call. Can be a
     *          {@see Google\ApiCore\RetrySettings} object, or an associative array
     *          of retry settings parameters. See the documentation on
     *          {@see Google\ApiCore\RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Bigtable\V2\CheckAndMutateRowResponse
     *
     * @throws \Google\ApiCore\ApiException if the remote call fails
     * @experimental
     */
    public function checkAndMutateRow($tableName, $rowKey, $optionalArgs = [])
    {
        $request = new CheckAndMutateRowRequest();
        $request->setTableName($tableName);
        $request->setRowKey($rowKey);
        if (isset($optionalArgs['predicateFilter'])) {
            $request->setPredicateFilter($optionalArgs['predicateFilter']);
        }
        if (isset($optionalArgs['trueMutations'])) {
            $request->setTrueMutations($optionalArgs['trueMutations']);
        }
        if (isset($optionalArgs['falseMutations'])) {
            $request->setFalseMutations($optionalArgs['falseMutations']);
        }

        $defaultCallSettings = $this->defaultCallSettings['checkAndMutateRow'];
        if (isset($optionalArgs['retrySettings']) && is_array($optionalArgs['retrySettings'])) {
            $optionalArgs['retrySettings'] = $defaultCallSettings->getRetrySettings()->with(
                $optionalArgs['retrySettings']
            );
        }
        $mergedSettings = $defaultCallSettings->merge(new CallSettings($optionalArgs));
        $callable = ApiCallable::createApiCall(
            $this->bigtableStub,
            'CheckAndMutateRow',
            $mergedSettings,
            $this->descriptors['checkAndMutateRow']
        );

        return $callable(
            $request,
            [],
            ['call_credentials_callback' => $this->createCredentialsCallback()]);
    }

    /**
     * Modifies a row atomically. The method reads the latest existing timestamp
     * and value from the specified columns and writes a new entry based on
     * pre-defined read/modify/write rules. The new value for the timestamp is the
     * greater of the existing timestamp or the current server time. The method
     * returns the new contents of all modified cells.
     *
     * Sample code:
     * ```
     * try {
     *     $bigtableClient = new BigtableClient();
     *     $formattedTableName = $bigtableClient->tableName('[PROJECT]', '[INSTANCE]', '[TABLE]');
     *     $rowKey = '';
     *     $rules = [];
     *     $response = $bigtableClient->readModifyWriteRow($formattedTableName, $rowKey, $rules);
     * } finally {
     *     $bigtableClient->close();
     * }
     * ```
     *
     * @param string                $tableName    The unique name of the table to which the read/modify/write rules should be
     *                                            applied.
     *                                            Values are of the form
     *                                            `projects/<project>/instances/<instance>/tables/<table>`.
     * @param string                $rowKey       The key of the row to which the read/modify/write rules should be applied.
     * @param ReadModifyWriteRule[] $rules        Rules specifying how the specified row's contents are to be transformed
     *                                            into writes. Entries are applied in order, meaning that earlier rules will
     *                                            affect the results of later ones.
     * @param array                 $optionalArgs {
     *                                            Optional.
     *
     *     @type \Google\ApiCore\RetrySettings|array $retrySettings
     *          Retry settings to use for this call. Can be a
     *          {@see Google\ApiCore\RetrySettings} object, or an associative array
     *          of retry settings parameters. See the documentation on
     *          {@see Google\ApiCore\RetrySettings} for example usage.
     * }
     *
     * @return \Google\Cloud\Bigtable\V2\ReadModifyWriteRowResponse
     *
     * @throws \Google\ApiCore\ApiException if the remote call fails
     * @experimental
     */
    public function readModifyWriteRow($tableName, $rowKey, $rules, $optionalArgs = [])
    {
        $request = new ReadModifyWriteRowRequest();
        $request->setTableName($tableName);
        $request->setRowKey($rowKey);
        $request->setRules($rules);

        $defaultCallSettings = $this->defaultCallSettings['readModifyWriteRow'];
        if (isset($optionalArgs['retrySettings']) && is_array($optionalArgs['retrySettings'])) {
            $optionalArgs['retrySettings'] = $defaultCallSettings->getRetrySettings()->with(
                $optionalArgs['retrySettings']
            );
        }
        $mergedSettings = $defaultCallSettings->merge(new CallSettings($optionalArgs));
        $callable = ApiCallable::createApiCall(
            $this->bigtableStub,
            'ReadModifyWriteRow',
            $mergedSettings,
            $this->descriptors['readModifyWriteRow']
        );

        return $callable(
            $request,
            [],
            ['call_credentials_callback' => $this->createCredentialsCallback()]);
    }

    /**
     * Initiates an orderly shutdown in which preexisting calls continue but new
     * calls are immediately cancelled.
     *
     * @experimental
     */
    public function close()
    {
        $this->bigtableStub->close();
    }

    private function createCredentialsCallback()
    {
        return $this->grpcCredentialsHelper->createCallCredentialsCallback();
    }
}
