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<?php
namespace Amp\Parallel\Worker;
use Amp\Loop;
use Amp\Promise;
const LOOP_POOL_IDENTIFIER = Pool::class;
const LOOP_FACTORY_IDENTIFIER = WorkerFactory::class;
/**
* Gets or sets the global worker pool.
*
* @param Pool|null $pool A worker pool instance.
*
* @return Pool The global worker pool instance.
*/
function pool(Pool $pool = null): Pool
{
if ($pool === null) {
$pool = Loop::getState(LOOP_POOL_IDENTIFIER);
if ($pool) {
return $pool;
}
$pool = new DefaultPool;
}
Loop::setState(LOOP_POOL_IDENTIFIER, $pool);
return $pool;
}
/**
* Enqueues a task to be executed by the global worker pool.
*
* @param Task $task The task to enqueue.
*
* @return Promise<mixed>
*/
function enqueue(Task $task): Promise
{
return pool()->enqueue($task);
}
/**
* Enqueues a callable to be executed by the global worker pool.
*
* @param callable $callable Callable needs to be serializable.
* @param mixed ...$args Arguments have to be serializable.
*
* @return Promise<mixed>
*/
function enqueueCallable(callable $callable, ...$args)
{
return enqueue(new CallableTask($callable, $args));
}
/**
* Gets a worker from the global worker pool.
*
* @return \Amp\Parallel\Worker\Worker
*/
function worker(): Worker
{
return pool()->getWorker();
}
/**
* Creates a worker using the global worker factory.
*
* @return \Amp\Parallel\Worker\Worker
*/
function create(): Worker
{
return factory()->create();
}
/**
* Gets or sets the global worker factory.
*
* @param WorkerFactory|null $factory
*
* @return WorkerFactory
*/
function factory(WorkerFactory $factory = null): WorkerFactory
{
if ($factory === null) {
$factory = Loop::getState(LOOP_FACTORY_IDENTIFIER);
if ($factory) {
return $factory;
}
$factory = new DefaultWorkerFactory;
}
Loop::setState(LOOP_FACTORY_IDENTIFIER, $factory);
return $factory;
}