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amp/examples/promises/deferred.php

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#!/usr/bin/env php
<?php
use Amp\Deferred;
use Amp\Loop;
use Amp\Promise;
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require_once __DIR__ . "/../../vendor/autoload.php";
/**
* @return Promise<string>
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*/
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function jobSuccess()
{
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$deferred = new Deferred();
// We delay Promise resolve for 1 sec to simulate some async job
Loop::delay(1 * 1000, function () use ($deferred) {
$deferred->resolve("value");
});
return $deferred->promise();
}
/**
* @return Promise<string>
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*/
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function jobFail()
{
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$deferred = new Deferred();
// We delay Promise fail for 2 sec to simulate some async job
Loop::delay(2 * 1000, function () use ($deferred) {
$deferred->fail(new Exception("force fail"));
});
return $deferred->promise();
}
Loop::run(function () {
try {
$asyncOperation1 = yield jobSuccess();
echo "asyncOperation1 result -> " . $asyncOperation1 . PHP_EOL;
// jobFail() will start only after jobSuccess() is finished, all this will be executed asynchronous
$asyncOperation2 = yield jobFail();
echo "asyncOperation2 result -> " . $asyncOperation2 . PHP_EOL; //this statment will not run
} catch (Throwable $exception) {
echo "asyncOperation catch -> " . $exception->getMessage() . PHP_EOL;
}
});