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<?php
namespace Amp\ParallelFunctions;
use Amp\MultiReasonException;
use Amp\Parallel\Worker\Pool;
use Amp\Promise;
use Amp\Serialization\SerializationException;
use Laravel\SerializableClosure\SerializableClosure;
use function Amp\call;
use function Amp\Parallel\Worker\enqueue;
use function Amp\Promise\any;
/**
* Parallelizes a callable.
*
* @param callable $callable Callable to parallelize.
* @param Pool|null $pool Worker pool instance to use or null to use the global pool.
*
* @return callable Callable executing in another thread / process.
* @throws SerializationException If the passed callable is not safely serializable.
*/
function parallel(callable $callable, Pool $pool = null): callable
{
if ($callable instanceof \Closure) {
$callable = new SerializableClosure($callable);
}
try {
$callable = \serialize($callable);
} catch (\Throwable $e) {
throw new SerializationException("Unsupported callable: " . $e->getMessage(), 0, $e);
}
return function (...$args) use ($pool, $callable): Promise {
$task = new Internal\SerializedCallableTask($callable, $args);
return $pool ? $pool->enqueue($task) : enqueue($task);
};
}
/**
* Parallel version of array_map, but with an argument order consistent with the filter function.
*
* @param array $array
* @param callable $callable
* @param Pool|null $pool Worker pool instance to use or null to use the global pool.
*
* @return Promise Resolves to the result once the operation finished.
* @throws \Error If the passed callable is not safely serializable.
*/
function parallelMap(array $array, callable $callable, Pool $pool = null): Promise
{
return call(function () use ($array, $callable, $pool) {
// Amp\Promise\any() guarantees that all operations finished prior to resolving. Amp\Promise\all() doesn't.
// Additionally, we return all errors as a MultiReasonException instead of throwing on the first error.
[$errors, $results] = yield any(\array_map(parallel($callable, $pool), $array));
if ($errors) {
throw new MultiReasonException($errors);
}
return $results;
});
}
/**
* Parallel version of array_filter.
*
* @param array $array
* @param callable $callable
* @param int $flag
* @param Pool|null $pool Worker pool instance to use or null to use the global pool.
*
* @return Promise
* @throws \Error If the passed callable is not safely serializable.
*/
function parallelFilter(array $array, callable $callable = null, int $flag = 0, Pool $pool = null): Promise
{
return call(function () use ($array, $callable, $flag, $pool) {
if ($callable === null) {
if ($flag === \ARRAY_FILTER_USE_BOTH || $flag === \ARRAY_FILTER_USE_KEY) {
throw new \Error('A valid $callable must be provided if $flag is set.');
}
$callable = function ($value) {
return (bool) $value;
};
}
// Amp\Promise\any() guarantees that all operations finished prior to resolving. Amp\Promise\all() doesn't.
// Additionally, we return all errors as a MultiReasonException instead of throwing on the first error.
if ($flag === \ARRAY_FILTER_USE_BOTH) {
[$errors, $results] = yield any(\array_map(parallel($callable, $pool), $array, \array_keys($array)));
} elseif ($flag === \ARRAY_FILTER_USE_KEY) {
[$errors, $results] = yield any(\array_map(parallel($callable, $pool), \array_keys($array)));
} else {
[$errors, $results] = yield any(\array_map(parallel($callable, $pool), $array));
}
if ($errors) {
throw new MultiReasonException($errors);
}
foreach ($array as $key => $arg) {
if (!$results[$key]) {
unset($array[$key]);
}
}
return $array;
});
}