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amp/example/backpressure.php

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#!/usr/bin/env php
<?php
require dirname(__DIR__) . '/vendor/autoload.php';
use Amp\Coroutine;
use Amp\Pause;
use Amp\Postponed;
use Amp\Loop\NativeLoop;
Amp\execute(function () {
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try {
$postponed = new Postponed;
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$observable = $postponed->getObservable();
$observable->subscribe(function ($value) {
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printf("Observable emitted %d\n", $value);
return new Pause(500); // Artificial back-pressure on observable.
});
$observable->when(function ($exception, $value) {
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if ($exception) {
printf("Observable failed: %s\n", $exception->getMessage());
return;
}
printf("Observable result %d\n", $value);
});
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$generator = function (Postponed $postponed) {
yield $postponed->emit(new Pause(500, 1));
yield $postponed->emit(new Pause(1500, 2));
yield $postponed->emit(new Pause(1000, 3));
yield $postponed->emit(new Pause(2000, 4));
yield $postponed->emit(5);
yield $postponed->emit(6);
yield $postponed->emit(7);
yield $postponed->emit(new Pause(2000, 8));
yield $postponed->emit(9);
yield $postponed->emit(10);
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$postponed->resolve(11);
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};
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yield new Coroutine($generator($postponed));
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} catch (\Exception $exception) {
printf("Exception: %s\n", $exception);
}
}, $loop = new NativeLoop());