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Till Krüss
92 lines
2.4 KiB
PHP
92 lines
2.4 KiB
PHP
<?php
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/*
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* This file is part of the Predis package.
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*
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* (c) 2009-2020 Daniele Alessandri
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* (c) 2021-2026 Till Krüss
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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use Predis\Client;
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require __DIR__ . '/shared.php';
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// This is a basic example on how to use the Predis\DispatcherLoop class in sharded pub/sub mode.
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//
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// Both channels belong to different shards. So in sharded mode we can subscribe
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// and receive messages from different shard channels.
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//
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// To see this example in action you can just use redis-cli and publish some
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// messages to the '{channels}_events' and 'control' channel, e.g.:
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// ./redis-cli
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// SPUBLISH {channels}_events first
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// SPUBLISH {channels}_events second
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// SPUBLISH {channels}_events third
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// SPUBLISH control terminate_dispatcher
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// 1. Create client and setup RW timeout to 0.
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$client = new Client(
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[
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'tcp://127.0.0.1:6372?read_write_timeout=0',
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'tcp://127.0.0.1:6373?read_write_timeout=0',
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'tcp://127.0.0.1:6374?read_write_timeout=0',
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], [
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'cluster' => 'redis',
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]);
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// 2. Run pub/sub loop.
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$pubSub = $client->pubSubLoop();
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// 3. Create a dispatcher loop instance and attach a bunch of callbacks.
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$dispatcher = new Predis\Consumer\PubSub\DispatcherLoop($pubSub);
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// 4. Demonstrate how to use a callable class as a callback for the dispatcher loop.
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class EventsListener implements Countable
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{
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private $events;
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public function __construct()
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{
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$this->events = [];
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}
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public function count()
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{
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return count($this->events);
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}
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public function getEvents()
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{
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return $this->events;
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}
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public function __invoke($payload, $dispatcher)
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{
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$this->events[] = $payload;
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}
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}
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// 5. Attach our callable class to the dispatcher.
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$dispatcher->attachCallback('{channels}_events', $events = new EventsListener());
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// 6. Attach a function to control the dispatcher loop termination with a message.
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$dispatcher->attachCallback('control', function ($payload, $dispatcher) {
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if ($payload === 'terminate_dispatcher') {
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$dispatcher->stop();
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}
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});
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// 7. Run the dispatcher loop until the callback attached to the 'control' channel
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// receives 'terminate_dispatcher' as a message.
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$dispatcher->run();
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// Display our achievements!
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echo "We received {$events->count()} messages!", PHP_EOL;
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// Say goodbye :-)
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echo 'Goodbye from Redis!', PHP_EOL;
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