php-resque-scheduler,php-resque-ex-scheduler

php-resque-scheduler: PHP Resque Scheduler

php-resque-scheduler is a PHP port of resque-scheduler,

which adds support for scheduling items in the future to Resque.

The PHP port of resque-scheduler has been designed to be an almost direct-copy

of the Ruby plugin, and is designed to work with the PHP port of resque,

php-resque.

At the moment, php-resque-scheduler only supports delayed jobs, which is the

ability to push a job to the queue and have it run at a certain timestamp, or

in a number of seconds. Support for recurring jobs (similar to CRON) is planned

for a future release.

Because the PHP port is almost a direct API copy of the Ruby version, it is also

compatible with the web interface of the Ruby version, which provides the

ability to view and manage delayed jobs.

Delayed Jobs

To quote the documentation for the Ruby resque-scheduler:

Delayed jobs are one-off jobs that you want to be put into a queue at some

point in the future. The classic example is sending an email:

require 'Resque/Resque.php';

require 'ResqueScheduler/ResqueScheduler.php';

$in = 3600;

$args = array('id' => $user->id);

ResqueScheduler::enqueueIn($in, 'email', 'SendFollowUpEmail', $args);

The above will store the job for 1 hour in the delayed queue, and then pull the

job off and submit it to the email queue in Resque for processing as soon as

a worker is available.

Instead of passing a relative time in seconds, you can also supply a timestamp

as either a DateTime object or integer containing a UNIX timestamp to the

enqueueAt method:

require 'Resque/Resque.php';

require 'ResqueScheduler/ResqueScheduler.php';

$time = 1332067214;

ResqueScheduler::enqueueAt($time, 'email', 'SendFollowUpEmail', $args);

$datetime = new DateTime('2012-03-18 13:21:49');

ResqueScheduler::enqueueAt(datetime, 'email', 'SendFollowUpEmail', $args);

NOTE: resque-scheduler does not guarantee a job will fire at the time supplied.

At the time supplied, resque-scheduler will take the job out of the delayed

queue and push it to the appropriate queue in Resque. Your next available Resque

worker will pick the job up. To keep processing as quick as possible, keep your

queues as empty as possible.

Worker

Like resque, resque-scheduler includes a worker that runs in the background. This

worker is responsible for pulling items off the schedule/delayed queue and adding

them to the queue for resque. This means that for delayed or scheduled jobs to be

executed, the worker needs to be running.

A basic "up-and-running" resque-scheduler.php file is included that sets up a

running worker environment is included in the root directory. It accepts many

of the same environment variables as php-resque:

REDIS_BACKEND - Redis server to connect to

LOGGING - Enable logging to STDOUT

VERBOSE - Enable verbose logging

VVERBOSE - Enable very verbose logging

INTERVAL - Sleep for this long before checking scheduled/delayed queues

APP_INCLUDE - Include this file when starting (to launch your app)

PIDFILE - Write the PID of the worker out to this file

The resque-scheduler worker requires resque to function. The demo

resque-scheduler.php worker allows you to supply a RESQUE_PHP environment

variable with the path to Resque.php. If not supplied and resque is not already

loaded, resque-scheduler will attempt to load it from your include path

(require_once 'Resque/Resque.php';')

It's easy to start the resque-scheduler worker using resque-scheduler.php:

$ RESQUE_PHP=../resque/lib/Resque/Resque.php php resque-scheduler.php

Event/Hook System

php-resque-scheduler uses the same event system used by php-resque and exposes

the following events.

afterSchedule

Called after a job has been added to the schedule. Arguments passed are the

timestamp, queue of the job, the class name of the job, and the job's arguments.

beforeDelayedEnqueue

Called immediately after a job has been pulled off the delayed queue and right

before the job is added to the queue in resque. Arguments passed are the queue

of the job, the class name of the job, and the job's arguments.

Contributors

chrisboulton

Wan Qi Chen (Kamisama)