<?php
/**
Example showing the usage of events.
The documentation still is very thin, so I'm not sure, the example is the best solution. But it works.
*/
use parallel\{Channel,Runtime,Events,Events\Event};
$myThread = function(Channel $channel) {
$events = new Events();
$events->addChannel($channel);
//$events->setBlocking(false); //Uncomment to don't block on Events::poll()
$events->setTimeout(1000000); //Comment when not blocking
while(true)
{
/*
...
Your code.
...
*/
//Read all available events
try
{
$event = NULL;
do
{
$event = $events->poll(); //Returns non-null if there is an event
if($event && $event->source == 'myChannel')
{
//It seems, the target gets deleted after returning an event,
//so add it again.
$events->addChannel($channel);
if($event->type == Event\Type::Read)
{
if(is_array($event->value) && count($event->value) > 0)
{
if($event->value['name'] == 'stop')
{
echo 'Stopping thread';
return; //Stop
}
else
{
echo 'Event: '.$event->value['name'].' => '.$event->value['value'].PHP_EOL;
}
}
}
else if($event->type == Event\Type::Close) return; //Stop
}
}
while($event);
}
catch(Events\Error\Timeout $ex)
{
//Timeout
echo 'Timeout'.PHP_EOL;
}
}
};
class MyClass {
private $runtime;
private $future;
private $channel;
public function start() {
//Create runtime
$this->runtime = new Runtime();
//Create buffered channel.
//Buffered channels don't block on Channel::send().
//Note that target names need to be unique within the process.
$this->channel = Channel::make('myChannel', Channel::Infinite);
global $myThread;
$this->future = $this->runtime->run($myThread, [$this->channel]);
}
public function stop() {
$this->channel->send(['name' => 'stop', 'value' => true]);
$this->future->value(); //Wait for thread to finish
$this->channel->close();
}
public function emit(string $name, $value)
{
$this->channel->send(['name' => $name, 'value' => $value]);
}
}
$a = new MyClass();
$a->start();
for($i = 0; $i < 5; $i++)
{
$a->emit('test', $i);
sleep(0.5);
}
sleep(2);
for($i = 5; $i < 10; $i++)
{
$a->emit('test', $i);
sleep(0.5);
}
$a->stop();
?>
The parallel\Events class
(0.9.0)
The Event Loop
The Event loop monitors the state of sets of futures and or channels (targets) in order to perform read (parallel\Future::value(), parallel\Channel::recv()) and write (parallel\Channel::send()) operations as the targets become available and the operations may be performed without blocking the event loop.
Sinopsisul clasei
/* Input */
/* Targets */
/* Behaviour */
/* Polling */
}Cuprins
- parallel\Events::setBlocking — Behaviour
- parallel\Events::setTimeout — Behaviour
- parallel\Events::setInput — Input
- parallel\Events::addChannel — Targets
- parallel\Events::addFuture — Targets
- parallel\Events::remove — Targets
- parallel\Events::poll — Polling
add a note
User Contributed Notes 3 notes
s dot laufer at homegear dot email ¶
5 years ago
gam6itko ¶
3 years ago
<?php
// example below shows how to stop child thread from main thread
use parallel\{Channel, Events, Events\Event\Type, Runtime};
$fnThread = static function (Channel $channel) {
$events = new Events();
$events->addChannel($channel);
$events->setBlocking(false); // don't block on Events::poll()
while (true) {
if ($event = $events->poll()) {
//It seems, the target gets deleted after returning an event, so add it again.
$events->addChannel($channel);
if (Type::Read === $event->type) {
echo "- received value: ".$event->value.PHP_EOL;
} elseif (Type::Close === $event->type) {
echo "- receiving close event".PHP_EOL;
return "i'm done";
}
}
echo "-\n";
usleep(500_000);
}
};
// main thread
$runtime = new Runtime();
$channel = new Channel();
$future = $runtime->run($fnThread, [$channel]);
$channel->send('message1');
sleep(2);
$channel->send('message2');
sleep(2);
echo "closing channel\n";
$channel->close();
echo "future said: ".$future->value();
echo PHP_EOL;
gam6itko ¶
3 years ago
<?php
// this example shows how Events handle Future events
use parallel\{Events, Events\Event, Runtime};
$events = new Events();
$runtime = new Runtime();
//Read (type: 1)
$future = $runtime->run(
static function (string $name) {
return "Future#$name result";
},
['Read']
);
$events->addFuture("Future#Read", $future);
//Cancel (type: 4)
$future = $runtime->run(
static function (string $name) {
throw new \Exception("Exception#$name");
},
['Cancel']
);
$events->addFuture("Future#Cancel", $future);
//Kill (type: 5)
$future = $runtime->run(
static function () {
sleep(100000);
},
[]
);
$events->addFuture("Future#Kill", $future);
$future->cancel(); //kill it
//Error (type: 6)
$future = $runtime->run(
static function () {
$memoryEater = [];
$i = 0;
while (++$i) {
$memoryEater[] = $i;
}
}
);
$events->addFuture("Future#Error", $future);
// reading events
/** @var Event $event */
foreach ($events as $i => $event) {
echo str_pad('', 50, '=') . " EVENT_$i\n";
var_dump($event);
echo "\n";
}
