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How to manage TimerService/scheduled task on mutiple application servers
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created by <a href="http://community.jboss.org/people/perfilgeminis">Guillermo Fernández</a> in <i>EJB3</i> - <a href="http://community.jboss.org/message/578196#578196">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi,</p><p>I have this scenario:</p><p>- multiple <em>JBoss Application Severs</em> (5.1 at this moment) whitout clustering.</p><p>- an application within a ejb3 module (<em>EAR</em>)</p><p>- one database </p><p>- every server (so the application) are connected to this same database.</p><p>- and the application deployed on each server (same application and configuration for every server)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>What I want to do is define, at server runtime, scheduled task to periodically run some heavy process.</p><p>But I want that the application be capable of start, modify the time task and/or cancel it.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I probe an evaluate to use <em>TimerService</em> (EJB3) and I had success on one server.</p><p>I mean, I could control any timer i create, reference, cancel, get info of it, through its timer id (cause I use <em>Stateless</em> bean, I managed it persisting/retrieving the id from a database, to know wich timer is wich).</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>But on the scenario I descript, this is not a solution. In part for things like every timer is "associated" (can be retrieved) by the bean who create it.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>So I came to request your advice.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>May be some of you came through this problem, or could give me a tip to resolve this scenario.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I know that the <em>JBoss AS</em> persist the timer that we create into the default <em>HSQL DB</em>. Maybe one solution could be changing the database that use the timer service to the external database (common for every jboss), like it explained in the chapter "<a class="jive-link-external-small" href="http://docs.jboss.org/jbossas/docs/Administration_And_Configuration_Guide/5/html_single/index.html#d0e5041">Change Other JBoss AS Services to Use External Database</a>", but I'm very lost yet .. I think.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks, Regards and apolgize for my english.</p></div>
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