Examples of javax.tools.diagnostics.runtime.java.JavaMonitor

Package javax.tools.diagnostics.runtime.java

Examples of javax.tools.diagnostics.runtime.java.JavaMonitor

javax.tools.diagnostics.runtime.java.JavaMonitor
Represents the underlying monitor used by a Java Virtual Machine to manage locking and synchronization of a Java object.

The underlying monitor is implementation specific. Some implementations may choose to use their monitor implementations to control access to Java Virtual Machine resources that are not objects. In such cases, {@link #getObject()} will return null.

Java programmers use the synchronized modifier on methods and the synchronized block within methods to control simultaneous access to Java objects. Java uses monitors for this synchronization, which can be implemented using a variety of techniques. The JavaMonitor class presents the simple monitor abstraction that allows the caller to determine:
- Which thread currently owns the monitor
- Which threads are waiting to be woken after they have gotten ownship of the monitor and relinquished it, normally within Object.wait() within a synchronized block or method.
- The threads that waiting to get ownership of the monitor. These are typically threads waiting to enter a synchronized block or method.
This API presents only what exists at the Java Virtual Machine bytecode level. The locking facilities provided by the {@link java.util.concurrent.lock}package are expected to be implemented on top of ordinary Java monitors.


    assertNotNull("Owner count incorrect", owner);
  }


  public void testNameWaiters_0_0_1() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(0, 0, 1).getMonitor();
    int count = 0;
    Iterator waiters = monitor.getNotifyWaiters().iterator();


    while (waiters.hasNext()) {
      JavaThread next = (JavaThread) waiters.next();
      assertEquals("Waiters name incorrect", generatePrefix(0, 0, 1)
          + "-" + SetupJavaMonitor_ObjectMonitors.monitorNotifyThreadName + "-" + count, next

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    }


  }


  public void testNameEnters_0_0_1() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(0, 0, 1).getMonitor();
    int count = 0;
    Iterator enters = monitor.getEnterWaiters().iterator();


    while (enters.hasNext()) {
      JavaThread next = (JavaThread) enters.next();
      assertEquals("Enters name incorrect", generatePrefix(0, 0, 1) + "-"
          + SetupJavaMonitor_ObjectMonitors.monitorEnterThreadName + "-" + count, next.getName());

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      count++;
    }
  }


  public void testNameOwners_0_0_1() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(0, 0, 1).getMonitor();
    JavaThread owner = monitor.getOwner();


    assertEquals("Owner name incorrect", generatePrefix(0, 0, 1) + "-"
        + SetupJavaMonitor_ObjectMonitors.monitorOwnerThreadName + "-0", owner.getName());
  }

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  }


  ///////////////////////////////////////////


  public void testFindMonitor_1_0_0() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(1, 0, 0).getMonitor();


    assertNotNull("Couldn't find monitor 1-0-0", monitor);
  }

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    assertNotNull("Couldn't find monitor 1-0-0", monitor);
  }


  public void testGetID_1_0_0() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(1, 0, 0).getMonitor();


    assertNotNull("JavaMonitor.getID() for 1-0-0 is null.", monitor.getID());
  }

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    assertNotNull("JavaMonitor.getID() for 1-0-0 is null.", monitor.getID());
  }


  public void testGetName_1_0_0() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(1, 0, 0).getMonitor();
    assertNotNull("JavaMonitor.getName() for 1-0-0 is null.", monitor
        .getName());
  }

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    assertNotNull("JavaMonitor.getName() for 1-0-0 is null.", monitor
        .getName());
  }


  public void testCountWaiters_1_0_0() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(1, 0, 0).getMonitor();
    int count = 0;
    Iterator waiters = monitor.getNotifyWaiters().iterator();


    while (waiters.hasNext()) {
      Object next = waiters.next();
      count++;
    }

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    assertEquals("Waiters count incorrect :" + count, 1, count);
  }


  public void testCountEnters_1_0_0() throws Exception {
    JavaMonitor monitor =(JavaMonitor)setup.findMonitorThreadConfig(1, 0, 0).getMonitor();
    int count = 0;
    Iterator enters = monitor.getEnterWaiters().iterator();


    while (enters.hasNext()) {
      Object next = enters.next();
      count++;
    }

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    assertEquals("Enters count incorrect :" + count, 0, count);
  }


  public void testCountOwners_1_0_0() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(1, 0, 0).getMonitor();
    JavaThread owner = monitor.getOwner();


    assertNull("Owner count incorrect", owner);
  }

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    assertNull("Owner count incorrect", owner);
  }


  public void testNameWaiters_1_0_0() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(1, 0, 0).getMonitor();
    int count = 0;
    Iterator waiters = monitor.getNotifyWaiters().iterator();


    while (waiters.hasNext()) {
      JavaThread next = (JavaThread) waiters.next();
      assertEquals("Waiters name incorrect", generatePrefix(1, 0, 0)
          + "-" + SetupJavaMonitor_ObjectMonitors.monitorNotifyThreadName + "-" + count, next

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