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<?php |
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/** |
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* This file is part of graze/parallel-process. |
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* |
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* Copyright © 2018 Nature Delivered Ltd. <https://www.graze.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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* |
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* @license https://github.com/graze/parallel-process/blob/master/LICENSE.md |
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* @link https://github.com/graze/parallel-process |
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*/ |
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namespace Graze\ParallelProcess; |
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use Graze\ParallelProcess\Event\PoolRunEvent; |
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use Graze\ParallelProcess\Exceptions\NotRunningException; |
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use SplPriorityQueue; |
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use Symfony\Component\Process\Process; |
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/** |
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* A PriorityPool allows you to manage how many, and the order on which to run child runs |
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*/ |
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class PriorityPool extends Pool |
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{ |
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const NO_MAX = -1; |
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/** @var SplPriorityQueue */ |
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protected $waitingQueue; |
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/** @var int */ |
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private $maxSimultaneous = -1; |
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/** @var bool */ |
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private $runInstantly = false; |
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/** @var bool */ |
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private $initialised = false; |
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/** |
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* Pool constructor. |
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* |
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* @param RunInterface[]|Process[] $items |
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* @param int $maxSimultaneous Maximum number of simultaneous processes |
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* @param bool $runInstantly Run any added processes immediately if they are not already |
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* running |
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* @param array $tags |
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* @param float $priority |
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*/ |
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public function __construct( |
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array $items = [], |
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$maxSimultaneous = self::NO_MAX, |
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$runInstantly = false, |
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array $tags = [], |
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$priority = 1.0 |
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) { |
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$this->maxSimultaneous = $maxSimultaneous; |
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$this->runInstantly = $runInstantly; |
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$this->waitingQueue = new SplPriorityQueue(); |
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$this->waitingQueue->setExtractFlags(SplPriorityQueue::EXTR_DATA); |
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parent::__construct($items, $tags, $priority); |
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$this->initialised = true; |
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if ($this->isRunning() || $runInstantly) { |
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$this->startNext(); |
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} |
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} |
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/** |
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* Add a new process to the pool |
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* |
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* @param RunInterface|PoolInterface|Process $item |
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* @param array $tags If a process is supplied, these are added to create a run. |
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* This is ignored when adding a run |
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* |
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* @return $this |
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*/ |
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public function add($item, array $tags = []) |
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{ |
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if ($item instanceof RunInterface |
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&& !($this->isRunning() |
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|| $this->runInstantly) |
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&& $item->isRunning()) { |
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throw new NotRunningException("add: unable to add a running item when the pool has not started"); |
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} |
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// special handling of child collections, a pool should only care about leaf nodes |
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if ($item instanceof PoolInterface) { |
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$item->addListener( |
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PoolRunEvent::POOL_RUN_ADDED, |
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function (PoolRunEvent $event) { |
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$this->add($event->getRun()); |
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} |
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); |
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foreach ($item->getAll() as $child) { |
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$this->add($child); |
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} |
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return $this; |
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} |
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parent::add($item, $tags); |
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if ($item instanceof RunInterface && !$item->hasStarted()) { |
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$this->waitingQueue->insert($item, $item->getPriority()); |
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if ($this->isRunning() || $this->runInstantly) { |
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$this->startNext(); |
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} |
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} |
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return $this; |
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} |
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/** |
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* Start all the processes running |
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* |
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* @return $this |
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*/ |
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public function start() |
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{ |
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$this->startNext(); |
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return $this; |
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} |
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/** |
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* Blocking call to run processes; |
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* |
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* @param float $checkInterval Seconds between checks |
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* |
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* @return bool `true` if all the runs were successful |
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*/ |
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public function run($checkInterval = self::CHECK_INTERVAL) |
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{ |
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$this->startNext(); |
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$interval = (int) ($checkInterval * 1000000); |
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while ($this->poll()) { |
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usleep($interval); |
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} |
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return $this->isSuccessful(); |
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} |
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/** |
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* @return bool |
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*/ |
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public function poll() |
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{ |
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parent::poll(); |
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$this->startNext(); |
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return $this->isRunning(); |
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} |
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/** |
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* Actually start a run |
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* |
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* @param RunInterface $run |
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*/ |
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private function startRun(RunInterface $run) |
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{ |
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$run->start(); |
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} |
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/** |
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* Check when a run has finished, if there are processes waiting, start them |
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*/ |
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private function startNext() |
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{ |
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// this allows us to wait until all runs are added in the constructor before running any. |
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// Thus preserving the priority they have supplied. |
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if (!$this->initialised) { |
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return; |
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} |
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if ($this->maxSimultaneous !== static::NO_MAX |
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&& $this->waitingQueue->valid() |
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&& count($this->running) < $this->maxSimultaneous) { |
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for ($i = count($this->running); $i < $this->maxSimultaneous && $this->waitingQueue->valid(); $i++) { |
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$this->startRun($this->waitingQueue->extract()); |
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} |
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} elseif ($this->maxSimultaneous === static::NO_MAX) { |
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while ($this->waitingQueue->valid()) { |
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$this->startRun($this->waitingQueue->extract()); |
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} |
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} |
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} |
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/** |
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* @return int |
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*/ |
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public function getMaxSimultaneous() |
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{ |
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return $this->maxSimultaneous; |
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} |
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/** |
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* @param int $maxSimultaneous |
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* |
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* @return $this |
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*/ |
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public function setMaxSimultaneous($maxSimultaneous) |
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{ |
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$this->maxSimultaneous = $maxSimultaneous; |
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return $this; |
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} |
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/** |
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* @return bool |
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*/ |
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public function isRunInstantly() |
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{ |
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return $this->runInstantly; |
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} |
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/** |
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* @param bool $runInstantly |
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* |
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* @return PriorityPool |
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*/ |
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public function setRunInstantly($runInstantly) |
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{ |
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$this->runInstantly = $runInstantly; |
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return $this; |
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} |
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} |
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graze /
parallel-process
