class.ilTestProcessLockerFile.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionProcessLocker.php';

class ilTestProcessLockerFile extends ilTestProcessLocker
{
        const PROCESS_NAME_TEST_START_LOCK_CHECK = 'testStartLockCheck';
        const PROCESS_NAME_RANDOM_PASS_BUILD = 'randomPassBuild';
        const PROCESS_NAME_TEST_FINISH = 'testFinish';
        
        protected $lockFileStorage;

        protected $lockFileHandles;

        public function __construct(ilTestProcessLockFileStorage $lockFileStorage)
        {
                $this->lockFileStorage = $lockFileStorage;
                $this->lockFileHandles = array();
        }

        protected function onBeforeExecutingTestStartOperation()
        {
                parent::onBeforeExecutingTestStartOperation();
                $this->requestLock(self::PROCESS_NAME_TEST_START_LOCK_CHECK);
        }

        protected function onAfterExecutingTestStartOperation()
        {
                $this->releaseLock(self::PROCESS_NAME_TEST_START_LOCK_CHECK);
                parent::onAfterExecutingTestStartOperation();
        }

        protected function onBeforeExecutingRandomPassBuildOperation($withTaxonomyTables = false)
        {
                parent::onBeforeExecutingRandomPassBuildOperation($withTaxonomyTables);
                $this->requestLock(self::PROCESS_NAME_RANDOM_PASS_BUILD);
        }

        protected function onAfterExecutingRandomPassBuildOperation($withTaxonomyTables = false)
        {
                $this->releaseLock(self::PROCESS_NAME_RANDOM_PASS_BUILD);
                parent::onAfterExecutingRandomPassBuildOperation($withTaxonomyTables);
        }
        
        protected function onBeforeExecutingTestFinishOperation()
        {
                parent::onBeforeExecutingTestStartOperation();
                $this->requestLock(self::PROCESS_NAME_TEST_FINISH);
        }
        
        protected function onAfterExecutingTestFinishOperation()
        {
                $this->releaseLock(self::PROCESS_NAME_TEST_FINISH);
                parent::onAfterExecutingTestStartOperation();
        }

        private function requestLock($processName)
        {
                $lockFilePath = $this->getLockFilePath($processName);
                $this->lockFileHandles[$processName] = fopen($lockFilePath, 'w');
                flock($this->lockFileHandles[$processName], LOCK_EX);
        }
        
        private function getLockFilePath($processName)
        {
                $path = $this->lockFileStorage->getPath();
                return $path.'/'.$processName.'.lock';
        }
        
        private function releaseLock($processName)
        {
                flock($this->lockFileHandles[$processName], LOCK_UN);
                fclose($this->lockFileHandles[$processName]);
        }
}