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amp/examples/stream/async-generator.php

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2020-05-13 17:15:21 +02:00
#!/usr/bin/env php
<?php
require __DIR__ . '/../../vendor/autoload.php';
use Amp\AsyncGenerator;
use Amp\Delayed;
use Amp\Loop;
Loop::run(function () {
try {
/** @psalm-var AsyncGenerator<int, int, int> $generator */
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$generator = new AsyncGenerator(function (callable $yield): \Generator {
$value = yield $yield(0);
$value = yield $yield(yield new Delayed(500, $value));
$value = yield $yield($value);
$value = yield $yield(yield new Delayed(300, $value));
$value = yield $yield($value);
$value = yield $yield($value);
$value = yield $yield(yield new Delayed(1000, $value));
$value = yield $yield($value);
$value = yield $yield($value);
$value = yield $yield(yield new Delayed(600, $value));
return $value;
});
// Use AsyncGenerator::continue() to get the first yielded value.
if ($value = yield $generator->continue()) {
$value = $value->unwrap();
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\printf("Async Generator yielded %d\n", $value);
// Use AsyncGenerator::send() to send values into the generator and get the next yielded value.
while ($value = yield $generator->send($value + 1)) {
$value = $value->unwrap();
\printf("Async Generator yielded %d\n", $value);
yield new Delayed(100); // Listener consumption takes 100 ms.
}
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}
\printf("Async Generator returned %d\n", yield $generator->getReturn());
} catch (\Exception $exception) {
\printf("Exception: %s\n", (string) $exception);
}
});