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amp/examples/iterators/emitter.php

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#!/usr/bin/env php
<?php
require __DIR__ . '/../../vendor/autoload.php';
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use Amp\Delayed;
use Amp\Emitter;
use Amp\Loop;
Loop::run(function () {
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try {
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$emitter = new Emitter;
Loop::defer(function () use ($emitter) {
// Listener emits all values at once.
$emitter->emit(1);
$emitter->emit(2);
$emitter->emit(3);
$emitter->emit(4);
$emitter->emit(5);
$emitter->emit(6);
$emitter->emit(7);
$emitter->emit(8);
$emitter->emit(9);
$emitter->emit(10);
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$emitter->complete();
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});
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$iterator = $emitter->getIterator();
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while (yield $iterator->advance()) {
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printf("Emitter emitted %d\n", $iterator->getCurrent());
yield new Delayed(100); // Listener consumption takes 100 ms.
}
} catch (\Throwable $exception) {
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printf("Exception: %s\n", $exception);
}
});