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Home » Eclipse Projects » Equinox » Synchonizing with EventAdmin
Synchonizing with EventAdmin [message #1764819] Fri, 02 June 2017 12:33 Go to next message
Stefan Winkler is currently offline Stefan WinklerFriend
Messages: 294
Registered: July 2009
Location: Germany
Senior Member
Hi,

I am currently trying to write a JUnit test for existing code which (description very simplified ;-)) listens to resource changes in the workspace and issues events using EventAdmin.postEvent().

In the test case I want to perform a change in the workspace and then check the state after all asynchronous events have been delivered. So, I need some (possibly hacky?) way to wait until the EventAdmin implementation (I can safely assume that we only use the Equinox implementation) has delivered all events.

Any ideas on how to achieve this? (other than just waiting for 10s and keep the fingers crossed that all events are delivered by then ;-))

Thanks in advance for any help!
Stefan



Re: Synchonizing with EventAdmin [message #1764823 is a reply to message #1764819] Fri, 02 June 2017 13:00 Go to previous message
Stefan Winkler is currently offline Stefan WinklerFriend
Messages: 294
Registered: July 2009
Location: Germany
Senior Member
Ok, this is what I have achieved so far.
  public static void waitAllEventsProcessed()
  {
    while (isEventThreadBusy())
    {
      readAndDispatchEvents();
    }
  }

  private static boolean isEventThreadBusy()
  {
    Thread thread = Thread.getAllStackTraces().keySet().stream()
        .filter(t -> t.getName().equals("EventAdmin Async Event Dispatcher Thread"))
        .findAny()
        .orElseThrow(() -> new IllegalStateException("Event Thread not found"));

    // if thread is not waiting, it is busy
    if (thread.getState() != State.WAITING)
    {
      return true;
    }

    // if thread's queue is not empty, it is busy
    Field headField;
    try
    {
      headField = thread.getClass().getDeclaredField("head");
      headField.setAccessible(true);
      if (headField.get(thread) != null)
      {
        return true;
      }
    }
    catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e)
    {
      // fall through and ignore head field...
    }

    // if thread is not waiting for getNextEvent(), it is busy
    StackTraceElement[] stack = thread.getStackTrace();
    if (stack.length > 2)
    {
      StackTraceElement getNextEventExpected = stack[2];
      if (!getNextEventExpected.getMethodName().equals("getNextEvent"))
      {
        return true;
      }
    }

    // thread is really unoccupied
    return false;
  }


It seems to work, but it's not nice :-(

Any better ideas?

Stefan
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