Locking graphs in JProfiler

Categories: JProfilerScreencast

In the screencast below, I present some of the features in the locking graphs that have been introduced in JProfiler 6.

The test class that is profiled in this screen cast is given below:

public class MonitorTest {
    // The only monitor that all threads are blocking or waiting on 
    private static final MonitorTest monitor = new MonitorTest();
    public static void main(String[] args) throws InterruptedException {
        // All threads execute this runnable, each thread acquires the 
        // monitor, works for 3 seconds and then waits on the monitor 
        Runnable runnable = new Runnable() {
            public void run() {
                synchronized (monitor) {
                    try {
                        // Instead of doing any real work, the thread just
                        // sleeps for 3 second
                        Thread.sleep(3000);
                        monitor.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        };
        // 3 threads are started with an offset of 500 ms
        new Thread(runnable, "Test Thread 1").start();
        Thread.sleep(500);
        new Thread(runnable, "Test Thread 2").start();
        Thread.sleep(500);
        new Thread(runnable, "Test Thread 3").start();
        // After 20 seconds, all threads are woken up and the test class
        // terminates
        Thread.sleep(20000);
        synchronized (monitor) {
            monitor.notifyAll();
        }
    }
}