vendor/doctrine/dbal/lib/Doctrine/DBAL/Sharding/PoolingShardConnection.php

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<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\DBAL\Sharding;

use Doctrine\Common\EventManager;
use Doctrine\DBAL\Configuration;
use Doctrine\DBAL\Connection;
use Doctrine\DBAL\Driver;
use Doctrine\DBAL\Event\ConnectionEventArgs;
use Doctrine\DBAL\Events;
use Doctrine\DBAL\Sharding\ShardChoser\ShardChoser;

/**
 * Sharding implementation that pools many different connections
 * internally and serves data from the currently active connection.
 *
 * The internals of this class are:
 *
 * - All sharding clients are specified and given a shard-id during
 *   configuration.
 * - By default, the global shard is selected. If no global shard is configured
 *   an exception is thrown on access.
 * - Selecting a shard by distribution value delegates the mapping
 *   "distributionValue" => "client" to the ShardChooser interface.
 * - An exception is thrown if trying to switch shards during an open
 *   transaction.
 *
 * Instantiation through the DriverManager looks like:
 *
 * @example
 *
 * $conn = DriverManager::getConnection(array(
 *    'wrapperClass' => 'Doctrine\DBAL\Sharding\PoolingShardConnection',
 *    'driver' => 'pdo_mysql',
 *    'global' => array('user' => '', 'password' => '', 'host' => '', 'dbname' => ''),
 *    'shards' => array(
 *        array('id' => 1, 'user' => 'slave1', 'password', 'host' => '', 'dbname' => ''),
 *        array('id' => 2, 'user' => 'slave2', 'password', 'host' => '', 'dbname' => ''),
 *    ),
 *    'shardChoser' => 'Doctrine\DBAL\Sharding\ShardChoser\MultiTenantShardChoser',
 * ));
 * $shardManager = $conn->getShardManager();
 * $shardManager->selectGlobal();