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parallel/src/Threading/Parcel.php

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<?php
namespace Icicle\Concurrent\Threading;
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use Icicle\Concurrent\Sync\Parcel as SyncParcel;
/**
* A thread-safe container that shares a value between multiple threads.
*/
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class Parcel implements SyncParcel
{
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/**
* @var \Icicle\Concurrent\Threading\Mutex
*/
private $mutex;
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/**
* @var \Icicle\Concurrent\Threading\Internal\Storage
*/
private $storage;
/**
* Creates a new shared object container.
*
* @param mixed $value The value to store in the container.
*/
public function __construct($value)
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{
$this->init($value);
}
/**
* @param mixed $value
*/
private function init($value)
{
$this->mutex = new Mutex();
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$this->storage = new Internal\Storage($value);
}
/**
* {@inheritdoc}
*/
public function unwrap()
{
return $this->storage->get();
}
/**
* {@inheritdoc}
*/
protected function wrap($value)
{
$this->storage->set($value);
}
/**
* @coroutine
*
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* Asynchronously invokes a callable while maintaining an exclusive lock on the container.
*
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* @param callable<mixed> $callback The function to invoke. The value in the container will be passed as the first
* argument.
*
* @return \Generator
*/
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public function synchronized(callable $callback)
{
/** @var \Icicle\Concurrent\Sync\Lock $lock */
$lock = (yield $this->mutex->acquire());
try {
$value = $this->unwrap();
$result = (yield $callback($value));
$this->wrap(null === $result ? $value : $result);
} finally {
$lock->release();
}
}
/**
* {@inheritdoc}
*/
public function __clone()
{
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$this->init($this->unwrap());
}
}