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<?php |
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namespace Thruster\Component\MysqlClient; |
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use mysqli; |
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use SplObjectStorage; |
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use Thruster\Component\MysqlClient\Exception\ConnectionException; |
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use Thruster\Component\Promise\Deferred; |
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use Thruster\Component\Promise\ExtendedPromiseInterface; |
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use Thruster\Component\Promise\FulfilledPromise; |
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use Thruster\Component\Promise\RejectedPromise; |
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/** |
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* Class ConnectionPool |
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* |
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* @package Thruster\Component\MysqlClient |
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* @author Aurimas Niekis <[email protected]> |
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*/ |
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class ConnectionPool |
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{ |
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/** |
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* @var callable |
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*/ |
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private $connectionFactory; |
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/** |
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* @var SplObjectStorage |
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*/ |
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private $connectionPool; |
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/** |
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* @var SplObjectStorage |
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*/ |
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private $idleConnections; |
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/** |
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* @var Deferred[] |
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*/ |
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private $waiting; |
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/** |
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* @var int |
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*/ |
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private $maxOpenConnections; |
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public function __construct(callable $connectionFactory, int $maxOpenConnections = 100) |
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{ |
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$this->connectionPool = new SplObjectStorage(); |
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$this->idleConnections = new SplObjectStorage(); |
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$this->waiting = []; |
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$this->maxOpenConnections = $maxOpenConnections; |
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$this->connectionFactory = $connectionFactory; |
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} |
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public function getConnection() : ExtendedPromiseInterface |
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{ |
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if ($this->idleConnections->count() > 0) { |
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$this->idleConnections->rewind(); |
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$connection = $this->idleConnections->current(); |
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$this->idleConnections->detach($connection); |
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return new FulfilledPromise($connection); |
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} |
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if ($this->connectionPool->count() >= $this->maxOpenConnections) { |
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$deferred = new Deferred(); |
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$this->waiting[] = $deferred; |
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return $deferred->promise(); |
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} |
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$connection = call_user_func($this->connectionFactory); |
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if (false !== $connection) { |
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$this->connectionPool->attach($connection); |
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return new FulfilledPromise($connection); |
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} else { |
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return new RejectedPromise(new ConnectionException()); |
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} |
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} |
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public function freeConnection(mysqli $connection) |
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{ |
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if (count($this->waiting) > 0) { |
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$deferred = array_shift($this->waiting); |
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$deferred->resolve($connection); |
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} else { |
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$this->idleConnections->attach($connection); |
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} |
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} |
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} |
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ThrusterIO /
mysql-client
