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<?php |
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|
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namespace Depicter\GuzzleHttp\Promise; |
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|
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/** |
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* A task queue that executes tasks in a FIFO order. |
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* |
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* This task queue class is used to settle promises asynchronously and |
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* maintains a constant stack size. You can use the task queue asynchronously |
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* by calling the `run()` function of the global task queue in an event loop. |
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* |
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* Depicter\GuzzleHttp\Promise\Utils::queue()->run(); |
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*/ |
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class TaskQueue implements TaskQueueInterface |
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{ |
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private $enableShutdown = true; |
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private $queue = []; |
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|
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public function __construct($withShutdown = true) |
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{ |
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if ($withShutdown) { |
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register_shutdown_function(function () { |
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if ($this->enableShutdown) { |
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// Only run the tasks if an E_ERROR didn't occur. |
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$err = error_get_last(); |
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if (!$err || ($err['type'] ^ E_ERROR)) { |
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$this->run(); |
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} |
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} |
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}); |
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} |
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} |
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|
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public function isEmpty() |
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{ |
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return !$this->queue; |
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} |
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|
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public function add(callable $task) |
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{ |
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$this->queue[] = $task; |
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} |
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|
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public function run() |
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{ |
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while ($task = array_shift($this->queue)) { |
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/** @var callable $task */ |
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$task(); |
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} |
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} |
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|
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/** |
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* The task queue will be run and exhausted by default when the process |
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* exits IFF the exit is not the result of a PHP E_ERROR error. |
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* |
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* You can disable running the automatic shutdown of the queue by calling |
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* this function. If you disable the task queue shutdown process, then you |
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* MUST either run the task queue (as a result of running your event loop |
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* or manually using the run() method) or wait on each outstanding promise. |
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* |
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* Note: This shutdown will occur before any destructors are triggered. |
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*/ |
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public function disableShutdown() |
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{ |
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$this->enableShutdown = false; |
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} |
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} |
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|
