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<?php
/*
* This file is part of the Predis package.
*
* (c) 2009-2020 Daniele Alessandri
* (c) 2021-2025 Till Krüss
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
use Predis\Client;
require __DIR__ . '/shared.php';
// This is a basic example on how to use the Predis\DispatcherLoop class in sharded pub/sub mode.
//
// Both channels belong to different shards. So in sharded mode we can subscribe
// and receive messages from different shard channels.
//
// To see this example in action you can just use redis-cli and publish some
// messages to the '{channels}_events' and 'control' channel, e.g.:
// ./redis-cli
// SPUBLISH {channels}_events first
// SPUBLISH {channels}_events second
// SPUBLISH {channels}_events third
// SPUBLISH control terminate_dispatcher
// 1. Create client and setup RW timeout to 0.
$client = new Client(
[
'tcp://127.0.0.1:6372?read_write_timeout=0',
'tcp://127.0.0.1:6373?read_write_timeout=0',
'tcp://127.0.0.1:6374?read_write_timeout=0',
], [
'cluster' => 'redis',
]);
// 2. Run pub/sub loop.
$pubSub = $client->pubSubLoop();
// 3. Create a dispatcher loop instance and attach a bunch of callbacks.
$dispatcher = new Predis\Consumer\PubSub\DispatcherLoop($pubSub);
// 4. Demonstrate how to use a callable class as a callback for the dispatcher loop.
class EventsListener implements Countable
{
private $events;
public function __construct()
{
$this->events = [];
}
public function count()
{
return count($this->events);
}
public function getEvents()
{
return $this->events;
}
public function __invoke($payload, $dispatcher)
{
$this->events[] = $payload;
}
}
// 5. Attach our callable class to the dispatcher.
$dispatcher->attachCallback('{channels}_events', $events = new EventsListener());
// 6. Attach a function to control the dispatcher loop termination with a message.
$dispatcher->attachCallback('control', function ($payload, $dispatcher) {
if ($payload === 'terminate_dispatcher') {
$dispatcher->stop();
}
});
// 7. Run the dispatcher loop until the callback attached to the 'control' channel
// receives 'terminate_dispatcher' as a message.
$dispatcher->run();
// Display our achievements!
echo "We received {$events->count()} messages!", PHP_EOL;
// Say goodbye :-)
echo 'Goodbye from Redis!', PHP_EOL;
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