Using Java Technology Quartz Scheduler and Java Scheduler Coding Tips on Java Example

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Tags/Keywords : Using-Java-Technology - Quartz-Scheduler-and-Java-Scheduler - Coding-Tips-on-Java Example
Author : Amit
Date (Year/Month/Date): 2009-01-27 Quartz Scheduler and Java Scheduler using Technology




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Quartz Scheduler - A highly
flexible job scheduler,    
designed to work in many   
different ways, can be put 
to work in Java application,
whether Swing based or AWT 
based application. Quartz  
Scheduler, that is running
jobs and in turn, are calling
/executing EJB components and 
Job Scheduler as service using
JMX. Quartz Scheduler is having
compatibility with JTA        
Transaction, this means if the
execution of job fails, then 
all changes made during execution
of the job will be roll backed to
previous consistent state. Quartz
Scheduler can be loaded or started
within web 



application using Servlet or Servlet Listener mode. Quartz can be started
as service if application server is JBoss with a flexible Quartz JMX for
JBoss Application Server.

There are so many features available in Quartz, that makes it, I think
a fully functional scheduler for enterprise application, of choice.

After going through Javadoc of Quartz Scheduler, I have managed to put
in place, a sample plan for exploring these aspects, including but not 
limiting to :

1. Handling UserTransaction in Jobs scheduled by Quartz Job Scheduler.

2. Loading Servlet for running Jobs in Web based application.
   
3. Loading Quartz scheduler as service using JMX with JBoss application
   server.


Basic usage of Quartz Scheduler includes, steps for creating Standard 
Scheduler Factory with properties already defined and then getting a 
Scheduler from this scheduler factory. Once Scheduler is obtained,    
it can be given JobDetail. JobDetail has the Job class and many more 
settings like, durable, volatile, group, JobDataMap (for details related
to invoking remote EJB components). Scheduler will also have 
SchedulerListener, JobListener, TriggerListener etc., to receive callback
from scheduler, time to time, as and when life cycle events of scheduler,
job and trigger are reached. Defining Job class that implements 
org.quartz.Job interface, is the atomic unit of Quartz Scheduler.

This Job class should implement execute method, with JobExecutionContext
passed to it as argument. JobExecutionContext provides Job with all the
context environment related information. 


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