Need help on concepts of threads

Hello! I need your help on some concepts related to threading, implemented in the J2ME.

I have a file which is a singleton, and executes the actions in the order in which they are stacked. Everything works well, but sometimes, I have to do an operation on the queue. Set some variables with a value of internal audit. It is here that I found the problem. Even if my class is a Singleton (I checked, it's really a singleton), I have 2 different instances of my class. Who is "managed" by a background thread, the other by the interaction of the user interface.

How to synchronize these 2 objects in one? I absolutely need my background thread to use the same queue like everyone else.

Here is a version stripped of my Singleton:

package ca.victrix.sp.synchronizer.action;

/**
 * Class used as a queue of different work processes
 * @author slevert
 *
 */
public class WorkQueue
{
    private final PoolWorker thread;
    private final LinkedList queue;
    private static boolean networkActivated;
    private static WorkQueue workQueue;

    /**
     * Gets the one and only instance of the queue
     * @return WorkQueue
     */
    public static WorkQueue getInstance() {
        if (workQueue == null){
            synchronized(WorkQueue.class) {
                WorkQueue inst = workQueue;
                if (inst == null) {
                    synchronized(WorkQueue.class) {
                        workQueue = new WorkQueue();
                        workQueue.setNetworkStatus(true);
                    }
                }
            }
        }

        return workQueue;
    }

    /**
     * Sets the network status
     * @param activated
     */
    private void setNetworkStatus(boolean activated) {
        networkActivated = activated;
    }

    /**
     * Gets the network status
     * @return boolean
     */
    private boolean getNetworkStatus() {
        return networkActivated;
    }

    /**
     * Private constructor
     */
    private WorkQueue() {
        queue = new LinkedList();
        thread = new PoolWorker();
        thread.start();
    }

    /**
     * Executes the actions by adding them to the linked list and by notifying the queue of the change
     * @param runnable
     */
    public void execute(Runnable runnable) {
        synchronized(queue) {

            if(!getNetworkStatus() && runnable instanceof WorkRecoverable)
                queue.addLast(runnable);

            if(getNetworkStatus())
                queue.addLast(runnable);

            if(getNetworkStatus())
                queue.notify();
        }
    }

    /**
     * Activates the queue
     */
    public void activate() {
        this.setNetworkStatus(true);
        synchronized (queue) {
            queue.notify();
        }
    }

    /**
     * Suspends the queue
     */
    public void suspend() {
        this.setNetworkStatus(false);
    }

    /**
     * Check if the network is activated
     * @return boolean
     */
    public boolean isNetworkActivated() {
        return networkActivated;
    }

    /**
     * Private class used to pool the threads
     * @author slevert
     *
     */
    private class PoolWorker extends Thread {

        /**
         * Runs the action
         */
        public void run() {
            Runnable runnable;

            while (true) {
                synchronized(queue) {
                    while (queue.isEmpty() || BlackBerryCore.getNetworkCoverage() == CoverageInfo.COVERAGE_NONE) {
                        try
                        {
                            queue.wait();
                        }
                        catch (InterruptedException ignored)
                        {
                        }
                    }

                    runnable = (Runnable) queue.removeFirst();
                }

                try {
                    runnable.run();
                }
                catch (RuntimeException e) {
                    execute(runnable);
                }
            }
        }
    }
}

Thanks in advance!

Think that you have fallen into one of the traps BlackBerry.

A static is NOT a singleton.

You will get different instances of static variables for various startups, so your GUI and your automatic boot process will have different static.

If you are not persistent data, the best place for this is RuntimeStore. Read the following Article.

How - to create a singleton by using the RuntimeStore
Article number: DB-00686
http://www.BlackBerry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/832062/How_to _...

Tags: BlackBerry Developers

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