Reference Guide

Architectural Overview
Zend Server Reference Manual
The Zend job queue is comprised of three main parts, the Job Queue Daemon, the Job Queue Client and
one or more servers that execute the jobs.
The Job Queue Daemon
The heart of Zend Job Queue is the Job Queue Daemon – this external service takes care of managing
scheduling, queuing and executing tasks. It also communicates with the Zend Server Administration
Interface to report any errors and failures.
Jobs are successfully queued once they are written to persistent storage. This makes sure that even if the
daemon has to be restarted, or even in case of complete system failure, jobs are not lost.
The Job Queue Client Extension
Jobs, be they scheduled, recurring or one-time queued jobs are all passed to the Daemon by the Job
Queue Client extension. This simple PHP extension provides an easy to use API for creating and
managing jobs from within PHP. It communicates with the Job Queue Daemon through a TCP socket or a
UNIX domain socket.
The Job Queue Client is also a part of the Zend Server Administration Interface – which, through the
same extension, allows the end user to create and manage jobs from the convenience of a web GUI.
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