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<?php |
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declare(strict_types=1); |
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namespace loophp\collection\Operation; |
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use Amp\Sync\LocalSemaphore; |
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use Closure; |
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use Exception; |
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use Generator; |
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use function Amp\Iterator\fromIterable; |
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use function Amp\ParallelFunctions\parallel; |
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use function Amp\Promise\wait; |
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use function Amp\Sync\ConcurrentIterator\map; |
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use function function_exists; |
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1 |
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if (!function_exists('Amp\ParallelFunctions\parallel')) { |
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throw new Exception('You need amphp/parallel-functions to get this operation working.'); |
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} |
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/** |
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* @immutable |
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* |
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* @template TKey |
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* @template T |
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*/ |
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final class AsyncMap extends AbstractOperation |
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{ |
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/** |
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* @template V |
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* |
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* @return Closure(callable(T, TKey): V): Closure(iterable<TKey, T>): Generator<TKey, V> |
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*/ |
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public function __invoke(): Closure |
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{ |
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return |
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/** |
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* @param callable(T, TKey): V $callback |
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* |
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* @return Closure(iterable<TKey, T>): Generator<TKey, V> |
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*/ |
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static fn (callable $callback): Closure => |
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/** |
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* @param iterable<TKey, T> $iterable |
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* |
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* @return Generator<TKey, V> |
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*/ |
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static function (iterable $iterable) use ($callback): Generator { |
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$parallelCallBack = |
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/** |
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* @param array{0: TKey, 1: T} $value |
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* |
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* @return array{0: TKey, 1: V} |
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*/ |
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static fn (array $value): array => [$value[0], $callback($value[1], $value[0])]; |
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$iter = map(fromIterable((new Pack())()($iterable)), new LocalSemaphore(32), parallel($parallelCallBack)); |
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while (wait($iter->advance())) { |
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/** @var array{0: TKey, 1: V} $item */ |
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$item = $iter->getCurrent(); |
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yield $item[0] => $item[1]; |
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} |
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}; |
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} |
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} |
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loophp /
collection
Let?s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let?s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: