java - Pausing all running threads for some time

Question

For instance consider the below scenario.

App1: I have a multiple-threaded java app, which enters a lot of files in DB.

App2: when i access the DB using some other app, its slow in fetching results.

So when both apps work simultaneously, it takes great time for DB fetching results on the front-end app2.

Here, i want to pause all transactions(threads) on App1 for some 'x min' time. Considering a trigger has already been installed when app 2 is being used. So when App2 is idle, App1 will resume as if nothing happened. Please list some or one best approach to achieve this

Map<Thread, StackTraceElement[]> threads = Thread.getAllStackTraces();
    for (Map.Entry<Thread, StackTraceElement[]> entry : threads.entrySet()) {
        entry.getKey().sleep();
    }

This didn't worked well.

Answer 1

Just to try:

private List<PausableThread> threads = new ArrayList<PausableThread>();

private void pauseAllThreads()
{
    for(PausableThread thread : this.threads)
    {
        thread.pause();
    }
}

And your Thread class will be something like this:

public class MyThread extends Thread implements PausableThread
{

private boolean isPaused = false;

@Override
public void pause()
{
    this.isPaused = true;
}

@Override
public void run()
{
    while(!Thread.currentThread().isInterrupted())
    {
        // Do your work...

        // Check if paused
        if(this.isPaused)
        {
            try
            {
                Thread.sleep(10 * 1000);
            }
            catch (InterruptedException e)
            {
                e.printStackTrace();
            }
        }
    }
}
}

And the PausableThread interface:

public interface PausableThread
{
    void pause();
}