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<?php |
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namespace Kaliop\eZMigrationBundle\Core\Helper; |
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use Symfony\Component\Process\Process; |
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/** |
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* This ProcessManager is a simple wrapper to enable parallel processing using Symfony Process component. |
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* Original source code from https://github.com/jagandecapri/symfony-parallel-process/blob/master/src/ProcessManager.php (MIT lic.) |
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*/ |
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class ProcessManager |
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{ |
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/** |
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* @param Process[] $processes |
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* @param int $maxParallel |
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* @param int $poll microseconds |
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* @param Callable $callback takes 3 args: $type, $buffer, $process |
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*/ |
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public function runParallel(array $processes, $maxParallel, $poll = 1000, $callback = null) |
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{ |
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$this->validateProcesses($processes); |
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// do not modify the object pointers in the argument, copy to local working variable |
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$processesQueue = $processes; |
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// fix maxParallel to be max the number of processes or positive |
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$maxParallel = min(abs($maxParallel), count($processesQueue)); |
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// get the first stack of processes to start at the same time |
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/** @var Process[] $currentProcesses */ |
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$currentProcesses = array_splice($processesQueue, 0, $maxParallel); |
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// start the initial stack of processes |
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foreach ($currentProcesses as $process) { |
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$process->start(function ($type, $buffer) use ($callback, $process) { |
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if ($callback) { |
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$callback($type, $buffer, $process); |
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} |
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}); |
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} |
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do { |
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// wait for the given time |
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usleep($poll); |
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// remove all finished processes from the stack |
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foreach ($currentProcesses as $index => $process) { |
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if (!$process->isRunning()) { |
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unset($currentProcesses[$index]); |
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// directly add and start new process after the previous finished |
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if (count($processesQueue) > 0) { |
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$nextProcess = array_shift($processesQueue); |
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$nextProcess->start(function ($type, $buffer) use ($callback, $nextProcess) { |
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if ($callback) { |
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$callback($type, $buffer, $nextProcess); |
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} |
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}); |
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$currentProcesses[] = $nextProcess; |
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} |
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} |
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} |
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// continue loop while there are processes being executed or waiting for execution |
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} while (count($processesQueue) > 0 || count($currentProcesses) > 0); |
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} |
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/** |
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* @param Process[] $processes |
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*/ |
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protected function validateProcesses(array $processes) |
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{ |
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if (empty($processes)) { |
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throw new \InvalidArgumentException('Can not run in parallel 0 commands'); |
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} |
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foreach ($processes as $process) { |
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if (!($process instanceof Process)) { |
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throw new \InvalidArgumentException('Process in array need to be instance of Symfony Process'); |
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} |
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} |
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} |
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} |
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kaliop-uk /
ezmigrationbundle
