#!/usr/bin/env php
<?php
require dirname(__DIR__) . '/vendor/autoload.php';
use Icicle\Concurrent\Forking\Fork;
use Icicle\Coroutine;
use Icicle\Loop;
Coroutine\create(function () {
$context = Fork::spawn(function () {
print "Child sleeping for 4 seconds...\n";
sleep(4);
yield from $this->send('Data sent from child.');
print "Child sleeping for 2 seconds...\n";
sleep(2);
return 42;
});
$timer = Loop\periodic(1, function () use($context) {
static $i;
$i = $i ? ++$i : 1;
print "Demonstrating how alive the parent is for the {$i}th time.\n";
});
try {
printf("Received the following from child: %s\n", yield from $context->receive());
printf("Child ended with value %d!\n", yield from $context->join());
} catch (Exception $e) {
print "Error from child!\n";
print $e . "\n";
} finally {
$timer->stop();
}
});
Loop\run();
/**
* @inheritdoc
*
* @param string $key
* @param mixed $value
*
* @return PromiseInterface
*
* @resolve mixed
*/
public function set($key, $value)
{
$deferred = new Deferred();
Loop\queue(function () use($deferred, $key, $value) {
if ($this->busy($deferred, $key)) {
$this->wait($deferred, $key);
} else {
Coroutine\create(function () use($deferred, $key, $value) {
$this->busy[$key] = $deferred;
if (is_callable($value)) {
$fork = Fork::spawn($value);
$value = (yield $fork->join());
}
$this->cache[$key] = $value;
unset($this->busy[$key]);
if (isset($this->waiting[$key])) {
while (count($this->waiting[$key])) {
/** @var Deferred $next */
$next = array_shift($this->waiting[$key]);
$next->resolve($value);
}
}
$deferred->resolve($value);
});
}
});
return $deferred->getPromise();
}