[jboss-jira] [JBoss JIRA] Commented: (JBPM-742) Reimplement JobExecutorServlet as a ServletContextListener

[Tom Baeyens (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBPM-742?page=comments#action_12354690 ] 
            
Tom Baeyens commented on JBPM-742:
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i see that a servlet context listener better fits what we want to do.   but i don't see yet a motivation on why we should do the effort of changing this now.  help with that is appreciated.

regards, tom.

> Reimplement JobExecutorServlet as a ServletContextListener
> ----------------------------------------------------------
>
>                 Key: JBPM-742
>                 URL: http://jira.jboss.com/jira/browse/JBPM-742
>             Project: JBoss jBPM
>          Issue Type: Feature Request
>          Components: Core Engine
>    Affects Versions: jBPM jPDL 3.2 alpha 2
>            Reporter: Alejandro Guizar
>         Assigned To: Alejandro Guizar
>             Fix For: jBPM jPDL 3.2
>
>
> ServletContextListeners are a viable alternative to servlets for management of the jBPM scheduler/command threads. From the Servlet 2.4 spec, section 10.2:
> >>>
> Servlet event listeners support event notifications for state changes in the ServletContext, HttpSession and ServletRequest objects.
> Servlet context listeners are used to **manage resources** or state held at a JVM level for the application.
> <<<
> Their intent definitely seems to match our purposes.
> Further below:
> >>>
> There may be multiple listener classes listening to each event type.
> <<<
> We could have separate listeners for the scheduler and command executor so that applications may remove either of them in case the related service is not used.
> Section 10.2.2 provides an example. When the application starts up, the listener creates a connection to the database and stores it in the servlet context. Servlets access the connection from the context as needed. When the application shuts down, the listener closes the connection.
> Our listener could start the thread and store it in the servlet context, then stop it using the mechanisms provided by JBPM-741. 

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