mirror of
https://github.com/danog/parallel.git
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98 lines
2.3 KiB
PHP
98 lines
2.3 KiB
PHP
<?php declare(strict_types = 1);
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namespace Amp\Parallel\Threading;
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use Amp\Coroutine;
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use Amp\Parallel\Sync\Parcel as SyncParcel;
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use Interop\Async\Awaitable;
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/**
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* A thread-safe container that shares a value between multiple threads.
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*/
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class Parcel implements SyncParcel {
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/** @var \Amp\Parallel\Threading\Mutex */
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private $mutex;
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/** @var \Amp\Parallel\Threading\Internal\Storage */
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private $storage;
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/**
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* Creates a new shared object container.
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*
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* @param mixed $value The value to store in the container.
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*/
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public function __construct($value) {
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$this->init($value);
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}
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/**
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* @param mixed $value
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*/
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private function init($value) {
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$this->mutex = new Mutex;
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$this->storage = new Internal\Storage($value);
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}
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/**
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* {@inheritdoc}
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*/
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public function unwrap() {
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return $this->storage->get();
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}
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/**
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* {@inheritdoc}
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*/
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protected function wrap($value) {
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$this->storage->set($value);
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}
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/**
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* @return \Interop\Async\Awaitable
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*/
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public function synchronized(callable $callback): Awaitable {
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return new Coroutine($this->doSynchronized($callback));
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}
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/**
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* @coroutine
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*
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* Asynchronously invokes a callable while maintaining an exclusive lock on the container.
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*
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* @param callable<mixed> $callback The function to invoke. The value in the container will be passed as the first
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* argument.
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*
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* @return \Generator
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*/
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private function doSynchronized(callable $callback): \Generator {
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/** @var \Amp\Parallel\Sync\Lock $lock */
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$lock = yield $this->mutex->acquire();
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try {
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$value = $this->unwrap();
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$result = $callback($value);
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if ($result instanceof \Generator) {
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$result = new Coroutine($result);
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}
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if ($result instanceof Awaitable) {
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$result = yield $result;
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}
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$this->wrap(null === $result ? $value : $result);
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} finally {
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$lock->release();
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}
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return $result;
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}
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/**
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* {@inheritdoc}
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*/
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public function __clone() {
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$this->init($this->unwrap());
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}
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}
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