vendor/doctrine/dbal/lib/Doctrine/DBAL/Sharding/PoolingShardManager.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\DBAL\Sharding\ShardChoser\ShardChoser;

/**
 * Shard Manager for the Connection Pooling Shard Strategy
 *
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 */
class PoolingShardManager implements ShardManager
{
    /**
     * @var PoolingShardConnection
     */
    private $conn;

    /**
     * @var ShardChoser
     */
    private $choser;

    /**
     * @var string|null
     */
    private $currentDistributionValue;

    /**
     * @param PoolingShardConnection $conn
     */
    public function __construct(PoolingShardConnection $conn)
    {
        $params       = $conn->getParams();
        $this->conn   = $conn;
        $this->choser = $params['shardChoser'];
    }

    /**
     * @return void
     */
    public function selectGlobal()
    {