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amp/examples/pipeline/backpressure.php
2020-09-25 12:32:37 -05:00

39 lines
1.1 KiB
PHP

#!/usr/bin/env php
<?php
require __DIR__ . '/../../vendor/autoload.php';
use Amp\Delayed;
use Amp\PipelineSource;
use Amp\Promise;
use function Amp\async;
use function Amp\await;
use function Amp\sleep;
try {
/** @psalm-var PipelineSource<int> $source */
$source = new PipelineSource;
$pipeline = $source->pipe();
Promise\rethrow(async(function (PipelineSource $source): void {
$source->yield(await(new Delayed(500, 1)));
$source->yield(await(new Delayed(1500, 2)));
$source->yield(await(new Delayed(1000, 3)));
$source->yield(await(new Delayed(2000, 4)));
$source->yield(5);
$source->yield(6);
$source->yield(7);
$source->yield(await(new Delayed(2000, 8)));
$source->yield(9);
$source->yield(10);
$source->complete();
}, $source));
while (null !== $value = $pipeline->continue()) {
\printf("Pipeline source yielded %d\n", $value);
sleep(500); // Listener consumption takes 500 ms.
}
} catch (\Exception $exception) {
\printf("Exception: %s\n", (string) $exception);
}