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  1. #1
    patluze is offline Member
    Join Date
    Nov 2010
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    Default calling a client on a specific thread

    I'm porting a .NET project to java and I’m looking for the best way to notify clients of an event on a thread that they specify.

    In .NET my event notification class has a set_SynchronizingObject method that takes as a parameter the .NET ISynchronizeInvoke interface, which has the InvokeRequired and Invoke methods, among others, to achieve this. The client initializes my event notification class with a reference to a listener and an instance of the ISynchronizeInvoke interface. To notify the client of an event, the event notification class does something like this:

    Event notification class


    if (clientImplementationOfISynchronizeInvoke.InvokeRe quired)
    create an object that represents MyMethod
    clientImplementationOfISynchronizeInvoke.Invoke(ob jectThatRepresentsMyMethod)
    call MyMethod

    call listener

    The client’s implementation of ISynchronizeInvoke::Invoke is responsible for calling MyMethod on the appropriate thread.

    My questions are:

    1) Is there something similar to ISynchronizeInvoke in java?

    2) If not, is there a “best practices” way to implement this functionality?

    3) A more general question -- how do I invoke a method on a specific thread?

    Thanks in advance for your thoughts.

  2. #2
    travishein's Avatar
    travishein is offline Senior Member
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    Sep 2009
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    i know of in Java the wait() and notify() methods part of the threading API.

    To have a specific thread invoke something, perhaps we could have that thread invoke wait() on some object and then when we want to have that thread do its thing, we could invoke notify().

    for example,

    Java Code:
    Thread t1 = new Thread(new Runnable() ) {
      public void run() {
        t1.wait();  // will block until we are notified
        // only gets here after we have been notified
    // some other thread
    t1.notify(); // instruct the thread we want them to run now.

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