code-orange / redis-counting-semaphore
Distributed counting semaphore implementation for redis
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Requires
- predis/predis: ^1.1
- ramsey/uuid: ^3.7|^4.0
Requires (Dev)
- symfony/process: ^4.0
This package is auto-updated.
Last update: 2024-11-06 16:45:20 UTC
README
redis-counting-semaphore
is a package with a counting semaphore implementation for PHP.
It uses redis as a central broker.
Installation
To install redis-counting-semaphore with composer:
composer require code-orange/redis-counting-semaphore
Usage
First, make sure you have a Predis connection instance.
You can create and attempt to obtain a semaphore like so:
<?php use CodeOrange\RedisCountingSemaphore\Semaphore; $client = new Predis\Client(); // Create a counting semaphore with a limit of 3 $sem = new Semaphore($client, 'semaphore-name', 3); if ($sem->acquire(0.1, 10)) { // Obtained the semaphore use_limited_resource(); $sem->release(); } else { // We weren't able to get a semaphore, even though we tried 10 times // And slept for 0.1 seconds in between tries }
API
/** * Semaphore constructor. * @param Client $client Predis client with an open connection * @param string $name Name of the semaphore * @param int $limit The amount of resources this semaphore protects * @param int $timeout Timeout of an acquired semaphore, in seconds */ public Semaphore(Client $client, $name, $limit = 1, $timeout = 10); /** * Try to acquire a semaphore * * @param float $sleep Number of seconds to sleep between retries. If null, this function will not retry but return immediately. * @param int $retries Number of times to retry before giving up * @return bool Whether or not the semaphore was acquired correctly */ public function acquire($sleep = null, $retries = null); /** * Release this semaphore * * @return void */ public function release(); /** * Refresh the semaphore * * @return bool Whether or not we still have the semaphore */ public function refresh();