SlmQueueRedis

Requirements

Zend Framework 2
SlmQueue
PhpRedis
predis (as alternative to PhpRedis)

Installation

First, install SlmQueue (instructions here). Then, add the following line into your composer.json file:

"require": {
    "slm/queue-redis": "@dev"
}

Note SlmQueueRedis is just started so no official stable release has been tagged.

Then, enable the module by adding SlmQueueRedis in your application.config.php file. You may also want to configure the module: just copy the slm_queue_redis.local.php.dist (you can find this file in the config folder of SlmQueueRedis) into your config/autoload folder, and override what you want.

Documentation

Before reading SlmQueueRedis documentation, please read SlmQueue documentation.

(Don't forget to first install Redis, and to run the daemon program on the server)

Setting the connection parameters

Copy the slm_queue_redis.local.php.dist file to your config/autoload folder, and follow the instructions.

Adding queues

SlmQueueRedis provides an interface for a queue that implements SlmQueue\Queue\QueueInterface and provides in addition the following methods:

release(JobInterface $job, array $options = array()): when a job fails, you can add the job again to the queue by releasing it, so that it can have another chance to be executed.
bury(JobInterface $job, array $options = array()): when a job fails and that it has not been manually released, it is automatically buried.
kick($max): when this method is called, it will move a maximum of $max buried jobs back to the queue.

A concrete class that implements this interface is included: SlmQueueRedis\Queue\RedisQueue and a factory is available to create the queue. Therefore, if you want to have a queue called "email", just add the following line in your module.config.php file:

return array(
    'slm_queue' => array(
        'queue_manager' => array(
            'factories' => array(
                'email' => 'SlmQueueRedis\Factory\RedisQueueFactory'
            )
        )
    )
);

This queue can therefore be pulled from the QueuePluginManager class.

Operations on queues

push

Valid options are:

priority: the lower the priority is, the sooner the job get popped from the queue (default to 1024)
delay: the delay in seconds before a job become available to be popped (default to 0 - no delay -)
ttr: in seconds, how much time a job can be reserved for (default to 60)

Example:

$queue->push($job, array(
    'priority' => 20,
    'delay'    => 23,
    'ttr'      => 50
));

pop

Valid option is:

timeout: by default, when we ask for a job, it will block until a job is found (possibly forever if new jobs never come). If you set a timeout (in seconds), it will return after the timeout is expired, even if no jobs were found

release

Valid options are:

priority: the lower the priority is, the sooner the job get popped from the queue (default to 1024)
delay: the delay in seconds before a job become available to be popped (default to 0 - no delay -)

bury

Valid option is:

priority: the lower the priority is, the sooner the job get kicked

How to bury/release a job

Redis offers a nice bury/kick/release mechanism, so that jobs that fail can have a second chance to be executed. SlmQueueRedis provides a nice way to easily bury/release a job. In fact, you just need to throw either the SlmQueueRedis\Job\Exception\BuryableException or SlmQueueRedis\Job\Exception\ReleasableException in the execute method of your job:

use SlmQueue\Job\AbstractJob;
use SlmQueueRedis\Job\Exception;

class SimpleJob extends AbstractJob
{
    public function execute()
    {
        // Bury the job, with a priority of 10
        throw new Exception\BuryableException(array('priority' => 10));

        // Release the job, with a priority of 10 and delay of 5 seconds
        throw new Exception\ReleasableException(array('priority' => 10, 'delay' => 5));
    }
}

Executing jobs

SlmQueueRedis provides a command-line tool that can be used to pop and execute jobs. You can type the following command within the public folder of your Zend Framework 2 application:

php index.php queue beanstalkd <queue> [--timeout=]

The queue is a mandatory parameter, while the timeout is an optional flag that specifies the duration in seconds for which the call will wait for a job to arrive in the queue before returning (because the script can wait forever if no job come).

Webador/SlmQueueRedis