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58 lines
1.5 KiB
PHP
58 lines
1.5 KiB
PHP
<?php
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namespace Amp\Awaitable\Internal;
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use Interop\Async\Loop;
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class WhenQueue {
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/**
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* @var callable[]
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*/
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private $queue = [];
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/**
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* @param callable|null $callback Initial callback to add to queue.
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*/
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public function __construct(callable $callback = null) {
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if (null !== $callback) {
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$this->push($callback);
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}
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}
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/**
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* Calls each callback in the queue, passing the provided values to the function.
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*
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* @param \Throwable|\Exception|null $exception
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* @param mixed $value
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*/
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public function __invoke($exception = null, $value = null) {
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foreach ($this->queue as $callback) {
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try {
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$callback($exception, $value);
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} catch (\Throwable $exception) {
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Loop::defer(static function ($watcher, $exception) {
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throw $exception;
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}, $exception);
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} catch (\Exception $exception) {
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Loop::defer(static function ($watcher, $exception) {
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throw $exception;
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}, $exception);
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}
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}
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}
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/**
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* Unrolls instances of self to avoid blowing up the call stack on resolution.
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*
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* @param callable $callback
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*/
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public function push(callable $callback) {
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if ($callback instanceof self) {
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$this->queue = \array_merge($this->queue, $callback->queue);
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return;
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}
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$this->queue[] = $callback;
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}
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}
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