178 lines
5.4 KiB
PHP
178 lines
5.4 KiB
PHP
<?php
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/**
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* FuzeWorks Async Library
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*
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* The FuzeWorks PHP FrameWork
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*
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* Copyright (C) 2013-2020 TechFuze
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* @author TechFuze
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* @copyright Copyright (c) 2013 - 2020, TechFuze. (http://techfuze.net)
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* @license https://opensource.org/licenses/MIT MIT License
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*
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* @link http://techfuze.net/fuzeworks
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* @since Version 1.0.0
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*
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* @version Version 1.0.0
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*/
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namespace FuzeWorks\Async\Constraint;
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use FuzeWorks\Async\Constraint;
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use FuzeWorks\Async\Task;
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use FuzeWorks\Async\Tasks;
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use FuzeWorks\Async\TasksException;
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use FuzeWorks\Exception\FactoryException;
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use FuzeWorks\Exception\LibraryException;
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use FuzeWorks\Factory;
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use FuzeWorks\Libraries;
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use FuzeWorks\Logger;
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/**
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* Class DependencyConstraint
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*
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* Use this constraint to prevent a task from running if one or multiple tasks this task depends on hasn't completed yet.
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* This constraint also can be applied to queue multiple tasks. Make a chain of tasks that depend on one another.
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*
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* @package FuzeWorks\Async\Constraint
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*/
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class DependencyConstraint implements Constraint
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{
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protected $dependencies = [];
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protected $delayTimes = 3;
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protected $returnStatus = Task::DELAYED;
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/**
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* DependencyConstraint constructor.
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*
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* To add dependencies, the following array should be supplied:
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* $dependencyList: array(string 'taskId', string 'taskId', string 'taskId')
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*
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* @param array $dependencyList
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* @param int $delayTimes Time that a task should be delayed before retrying
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* @throws TasksException
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*/
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public function __construct(array $dependencyList, int $delayTimes = 3)
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{
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$this->dependencies = $dependencyList;
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$this->delayTimes = $delayTimes;
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// Test if async library can be loaded
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$this->loadTasksLib();
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}
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/**
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* @inheritDoc
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*/
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public function intervene(Task $task): bool
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{
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// Fetch taskStorage
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try {
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$tasks = $this->loadTasksLib();
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$taskStorage = $tasks->getTaskStorage();
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// Is any dependency unresolved?
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$hasUnresolved = false;
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// Test if any dependency has not been resolved
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foreach ($this->dependencies as $dependency)
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{
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// Get dependency
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$dependencyTask = $taskStorage->getTaskById($dependency);
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// If the dependency task is completed, ignore it and continue to next dependency
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if ($dependencyTask->getStatus() === Task::COMPLETED)
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continue;
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elseif ($dependencyTask->getStatus() === Task::CANCELLED)
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{
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// Cancel current task
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$task->setOutput('', 'Task cancelled due to failed dependency.');
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$this->returnStatus = Task::CANCELLED;
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return true;
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}
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else
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$hasUnresolved = true;
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}
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// If any unresolved tasks exist, delay task execution
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if ($hasUnresolved)
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{
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$this->returnStatus = Task::DELAYED;
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return true;
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}
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} catch (TasksException $e) {
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Logger::logError("Could not constraint task. '" . $e->getMessage() . "'");
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$this->returnStatus = Task::FAILED;
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return true;
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}
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return false;
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}
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/**
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* @inheritDoc
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*/
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public function blockCode(): int
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{
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return $this->returnStatus;
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}
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/**
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* @inheritDoc
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*/
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public function delayTime(): int
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{
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return time() + $this->delayTimes;
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}
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/**
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* Return a list of dependencies
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*
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* @return array
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*/
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public function getDependencies()
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{
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return $this->dependencies;
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}
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/**
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* Load the tasks library, so that dependencies can get scanned later
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*
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* @return Tasks
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* @throws TasksException
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*/
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private function loadTasksLib(): Tasks
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{
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try {
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/** @var Libraries $libraries */
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$libraries = Factory::getInstance('libraries');
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/** @var Tasks $tasks */
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$tasks = $libraries->get('async');
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return $tasks;
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} catch (FactoryException | LibraryException $e) {
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throw new TasksException("Could not constrain task. Async library could not be loaded.");
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}
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}
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} |