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<?php |
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namespace Ez\DbLinker\RetryStrategy; |
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use Exception; |
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use stdClass; |
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use Ez\DbLinker\Driver\Connection\MasterSlavesConnection; |
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use Ez\DbLinker\Driver\Connection\RetryConnection; |
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trait RetryStrategy |
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{ |
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private $retryLimit; |
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public function __construct($retryLimit = INF) |
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{ |
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$this->retryLimit = $retryLimit; |
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} |
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public function shouldRetry(Exception $exception, RetryConnection $connection) { |
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if (!$this->canRetry($connection)) { |
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return false; |
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} |
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$strategy = $this->errorCodeStrategy($this->errorCode($exception)); |
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$res = $this->applyStrategy($strategy, $connection); |
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return $res; |
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} |
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public function retryLimit() |
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{ |
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return $this->retryLimit > 0 ? (int) $this->retryLimit : 0; |
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} |
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private function canRetry(RetryConnection $connection) |
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{ |
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return $this->retryLimit > 0 && $connection->transactionLevel() === 0; |
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} |
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private function errorCodeStrategy($errorCode) |
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{ |
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$strategy = (object) [ |
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'retry' => true, |
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'wait' => 0, |
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'changeServer' => false, |
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'reconnect' => false, |
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]; |
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$errorCodeStrategies = $this->errorCodeStrategies(); |
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if (array_key_exists($errorCode, $errorCodeStrategies)) { |
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foreach ($errorCodeStrategies[$errorCode] as $behavior => $value) { |
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$strategy->$behavior = $value; |
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} |
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return $strategy; |
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} |
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return (object) ['retry' => false]; |
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} |
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private function applyStrategy(stdClass $strategy, RetryConnection $connection) { |
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if ($strategy->retry === false || !$this->changeServer($strategy, $connection)) { |
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return false; |
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} |
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sleep($strategy->wait); |
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$this->reconnect($strategy, $connection); |
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$this->retryLimit--; |
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return true; |
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} |
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private function changeServer(stdClass $strategy, RetryConnection $connection) |
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{ |
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if (!$strategy->changeServer) { |
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return true; |
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} |
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$wrappedConnection = $connection->wrappedConnection(); |
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if ($wrappedConnection instanceof MasterSlavesConnection && !$wrappedConnection->isConnectedToMaster()) { |
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$wrappedConnection->disableCurrentSlave(); |
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return true; |
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} |
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return false; |
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} |
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private function reconnect(stdClass $strategy, RetryConnection $connection) |
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{ |
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if ($strategy->reconnect) { |
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$connection->close(); |
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} |
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} |
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public function __destruct() { |
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if ($connection !== null) { |
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$connection->close(); |
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} |
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} |
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protected abstract function errorCodeStrategies(); |
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protected abstract function errorCode(Exception $exception); |
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} |
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ezweb /
dblinker
This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.