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Trying to clear a dead-lock of some type
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Trying to clear a dead-lock of some type


  • Subject: Trying to clear a dead-lock of some type
  • From: WebObjects <email@hidden>
  • Date: Thu, 19 May 2005 12:22:26 -0700

The following function works consistently, unless there is some contention
(I'm sharing a datasource with other applications).  There is the expected
issue of saving to a locked row - but even if I trap the exception, then
repeat this function some time later (after I'm certain the other apps are
not locking the same rows) I still get the same contention.

First, do you see anything in this method that is out of place or sequence?
(it occurs in a TimerTask within Application)  I'm not 100% certain that my
ec.refreshAllObjects is place in the proper place.

Advice is greatly appreciated!

-Bill


public void SearchForSixAMTasks() {

        try{

        TimeZone tz = TimeZone.getTimeZone("Etc/GMT");
        NSTimestamp SixAM = new NSTimestamp(1899, 12, 30, 14, 2, 0, tz);
        NSMutableArray args = new NSMutableArray();
        args.addObject(SixAM);
        args.addObject("0");
        EOQualifier qualifier =
EOQualifier.qualifierWithQualifierFormat("starttime = %@ AND
taskcompletedindicator = %@", args);


        EOFetchSpecification spec = new EOFetchSpecification("Tbltasks",
qualifier, null);


        EOEditingContext ec = new EOEditingContext();
        ec.refreshAllObjects();

        //lock EC
        ec.lock();

        //Fetch
        NSArray array = ec.objectsWithFetchSpecification(spec);
        NSMutableArray foundTasks = new NSMutableArray(array);


        Enumeration e = foundTasks.objectEnumerator();

            while(e.hasMoreElements()) {

                Tbltasks currentTask = (Tbltasks)e.nextElement();
                TaskReview review = new TaskReview();

                System.out.println(currentTask.taskcomment() + " - before
change.");

                review.GetRepsData(currentTask); //data is
read,modified,etc. in this method

                System.out.println(currentTask.taskcompletedindicator());

                System.out.println(currentTask.alarmindicator());

                }

            ec.saveChanges();

            //-- unlock EC
            ec.unlock();
            ec.refreshAllObjects();


                    } catch (Exception e) {

                    // - Definite potential for locking issues with TPE, but
only when intentionally trying to break it
                    System.out.println("RepeatingTask: exception in
SearchForSixAMTasks()");

                }

            }


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