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JSP + Portlet + Threads question

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  • 20-05-2009 1:22pm
    #1
    tetsujin1979
    Registered Users Posts: 495 ✭✭


    I have a small problem, hoping someone can help.

    Here's the setup, I have a JSP with Start and Stop buttons, that is displayed in a portlet.
    The stop button is disabled by default.
    When the start button is clicked, a thread is kicked off from the portlet that handles the JSP, the processAction sets a variable to enable the stop button in the UI.
    If the stop button is clicked ,the thread stops running, the start button is enabled and the stop button is disabled.
    This all runs correctly.
    My question is - is there a way to notify the JSP (either through the portlet or using other means) that the thread has completed, so I can print a message and disable the stop button?


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    #2
    marco_polo
    Moderators, Science, Health & Environment Moderators Posts: 10,079 Mod ✭✭✭✭marco_polo


    tetsujin1979 wrote: »
    I have a small problem, hoping someone can help.

    Here's the setup, I have a JSP with Start and Stop buttons, that is displayed in a portlet.
    The stop button is disabled by default.
    When the start button is clicked, a thread is kicked off from the portlet that handles the JSP, the processAction sets a variable to enable the stop button in the UI.
    If the stop button is clicked ,the thread stops running, the start button is enabled and the stop button is disabled.
    This all runs correctly.
    My question is - is there a way to notify the JSP (either through the portlet or using other means) that the thread has completed, so I can print a message and disable the stop button?


    http://www.onjava.com/pub/a/onjava/2003/06/11/jsp_progressbars.html

    I think this is something on to what you are looking for but it is quite different in that it performs forced refresh using javascript. Problem with what you are trying to do is once the JSP has returned the page to the client it has completed the request, there is nothing still running to notify about thread completion.


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