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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Deploy\Model;
use Magento\Framework\App\ResourceConnection;
class ProcessQueueManager
{
/**
* Default max amount of processes
*/
const DEFAULT_MAX_PROCESSES_AMOUNT = 4;
/**
* @var ProcessTask[]
*/
private $tasksQueue = [];
/**
* @var ProcessTask[]
*/
private $processTaskMap = [];
/**
* @var int
*/
private $maxProcesses;
/**
* @var ProcessManager
*/
private $processManager;
/**
* @var ResourceConnection
*/
private $resourceConnection;
/**
* @var ProcessTaskFactory
*/
private $processTaskFactory;
/**
* @param ProcessManager $processManager
* @param ResourceConnection $resourceConnection
* @param ProcessTaskFactory $processTaskFactory
* @param int $maxProcesses
*/
public function __construct(
ProcessManager $processManager,
ResourceConnection $resourceConnection,
ProcessTaskFactory $processTaskFactory,
$maxProcesses = self::DEFAULT_MAX_PROCESSES_AMOUNT
) {
$this->processManager = $processManager;
$this->resourceConnection = $resourceConnection;
$this->processTaskFactory = $processTaskFactory;
$this->maxProcesses = $maxProcesses;
}
/**
* @param callable $task
* @param callable[] $dependentTasks
* @return void
*/
public function addTaskToQueue(callable $task, $dependentTasks = [])
{
$dependentTasks = array_map(function (callable $task) {
return $this->createTask($task);
}, $dependentTasks);
$task = $this->createTask($task, $dependentTasks);
$this->tasksQueue[$task->getId()] = $task;
}
/**
* Process tasks queue
* @return int
*/
public function process()
{
$processQueue = [];
$this->internalQueueProcess($this->tasksQueue, $processQueue);
$returnStatus = 0;
while (count($this->processManager->getProcesses()) > 0) {
foreach ($this->processManager->getProcesses() as $process) {
if ($process->isCompleted()) {
$dependedTasks = isset($this->processTaskMap[$process->getPid()])
? $this->processTaskMap[$process->getPid()]
: [];
$this->processManager->delete($process);
$returnStatus |= $process->getStatus();
$this->internalQueueProcess(array_merge($processQueue, $dependedTasks), $processQueue);
if (count($this->processManager->getProcesses()) >= $this->maxProcesses) {
break 1;
}
}
}
usleep(5000);
}
$this->resourceConnection->closeConnection();
return $returnStatus;
}
/**
* @param ProcessTask[] $taskQueue
* @param ProcessTask[] $processQueue
* @return void
*/
private function internalQueueProcess($taskQueue, &$processQueue)
{
$processNumber = count($this->processManager->getProcesses());
foreach ($taskQueue as $task) {
if ($processNumber >= $this->maxProcesses) {
if (!isset($processQueue[$task->getId()])) {
$processQueue[$task->getId()] = $task;
}
} else {
unset($processQueue[$task->getId()]);
$this->fork($task);
$processNumber++;
}
}
}
/**
* @param callable $handler
* @param array $dependentTasks
* @return ProcessTask
*/
private function createTask($handler, $dependentTasks = [])
{
return $this->processTaskFactory->create(['handler' => $handler, 'dependentTasks' => $dependentTasks]);
}
/**
* @param ProcessTask $task
* @return void
*/
private function fork(ProcessTask $task)
{
$process = $this->processManager->fork($task->getHandler());
if ($task->getDependentTasks()) {
$pid = $process->getPid();
foreach ($task->getDependentTasks() as $dependentTask) {
$this->processTaskMap[$pid][$dependentTask->getId()] = $dependentTask;
}
}
}
}