105 lines
3.3 KiB
PHP
105 lines
3.3 KiB
PHP
<?php namespace services\utils;
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/**
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* Copyright 2016 OpenStack Foundation
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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use Illuminate\Support\Facades\Log;
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use libs\utils\ITransactionService;
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use Closure;
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use LaravelDoctrine\ORM\Facades\Registry;
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use Doctrine\DBAL\Exception\RetryableException;
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use Exception;
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/**
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* Class DoctrineTransactionService
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* @package services\utils
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*/
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final class DoctrineTransactionService implements ITransactionService
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{
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/**
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* @var string
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*/
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private $manager_name;
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const MaxRetries = 3;
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/**
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* DoctrineTransactionService constructor.
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* @param string $manager_name
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*/
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public function __construct($manager_name)
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{
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$this->manager_name = $manager_name;
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}
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/**
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* Execute a Closure within a transaction.
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*
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* @param Closure $callback
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* @return mixed
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*
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* @throws \Exception
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*/
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public function transaction(Closure $callback)
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{
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$retry = 0;
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$done = false;
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$result = null;
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while (!$done and $retry < self::MaxRetries) {
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try {
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$em = Registry::getManager($this->manager_name);
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$con = $em->getConnection();
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/**
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* Some database systems close the connection after a period of time, in MySQL this is system variable
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* `wait_timeout`. Given the daemon is meant to run indefinitely we need to make sure we have an open
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* connection before working any job. Otherwise we would see `MySQL has gone away` type errors.
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*/
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if ($con->ping() === false) {
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$con->close();
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$con->connect();
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}
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if (!$em->isOpen()) {
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Log::warning("DoctrineTransactionService::transaction: entity manager is closed!, trying to re open...");
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$em = Registry::resetManager($this->manager_name);
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// new entity manager
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$con = $em->getConnection();
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}
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$con->beginTransaction(); // suspend auto-commit
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$result = $callback($this);
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$em->flush();
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$con->commit();
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$done = true;
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} catch (RetryableException $ex) {
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Log::warning("retrying ...");
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Registry::resetManager($this->manager_name);
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$con->rollBack();
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Log::warning($ex);
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$retry++;
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if ($retry === self::MaxRetries) {
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throw $ex;
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}
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} catch (Exception $ex) {
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Log::warning("rolling back transaction");
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$em->close();
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$con->rollBack();
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Log::error($ex);
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throw $ex;
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}
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}
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return $result;
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}
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}
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