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_2_2_1() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(2, 2, 1).getMonitor();    
    Iterator waiters = monitor.getNotifyWaiters().iterator();


    String error = checkNames(waiters, generatePrefix(2, 2, 1)
        + "-" + SetupJavaMonitor_ObjectMonitors.monitorNotifyThreadName , 2);
    assertNull(error, error);
  }

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        + "-" + SetupJavaMonitor_ObjectMonitors.monitorNotifyThreadName , 2);
    assertNull(error, error);
  }


  public void testNameEnters_2_2_1() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(2, 2, 1).getMonitor();    
    Iterator enters = monitor.getEnterWaiters().iterator();


    String error = checkNames(enters, generatePrefix(2, 2, 1) + "-"
        + SetupJavaMonitor_ObjectMonitors.monitorEnterThreadName, 2);
    
    assertNull(error, error);

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    assertNull(error, error);
  }
  
  public void testNameOwners_2_2_1() throws Exception {
    JavaMonitor monitor = (JavaMonitor)setup.findMonitorThreadConfig(2, 2, 1).getMonitor();
    JavaThread owner = monitor.getOwner();


    assertEquals("Owner name incorrect", generatePrefix(2, 2, 1) + "-"
        + SetupJavaMonitor_ObjectMonitors.monitorOwnerThreadName + "-0", owner.getName());
  }

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   */
  public void testGetID() throws Exception {
    Set foundSet = new HashSet(SetupJavaMonitor_ObjectMonitors.NUM_MONITORS);
    
    for (int i=0; i < SetupJavaMonitor_ObjectMonitors.NUM_MONITORS; i++){
      JavaMonitor monitor=(JavaMonitor) setup.monitorConfigs[i].monitor;
      ImagePointer id = monitor.getID();
      
      assertNotNull("Found null monitor id for " + setup.monitorConfigs[i].id, id);
      
      assertFalse("Found duplicate monitor id. " + setup.monitorConfigs[i].id, foundSet.contains(id));

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  ////////////////////////////////////
  
  public void testGetName() throws Exception {
    for (int i=0; i < SetupJavaMonitor_ObjectMonitors.NUM_MONITORS; i++){
      JavaMonitor monitor=(JavaMonitor) setup.monitorConfigs[i].monitor;
      String name = monitor.getName();
      
      assertNotNull("Found null monitor name for " + setup.monitorConfigs[i].id, name);
    }
  }

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    }
  }
  
  public void testGetObject() throws Exception {
    for (int i=0; i < SetupJavaMonitor_ObjectMonitors.NUM_MONITORS; i++){
      JavaMonitor monitor=(JavaMonitor) setup.monitorConfigs[i].monitor;
      JavaObject object = monitor.getObject();
      
      assertEquals("Monitor object class unexpected name.",setup.monitorClassName, object.getJavaClass().getName());
      
      JavaField idField = getJavaField(object, "id");
      String idString = idField.getString(object);

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        System.getProperty("java.vm.version"));
    
    for (int i = 0; i < setup.monitorConfigs.length; i++) {
      System.out.println("Printing out status of "+ setup.monitorConfigs[i].id);
      System.out.println("==================================");
      JavaMonitor monitor = (JavaMonitor) setup.monitorConfigs[i].getMonitor();
      
      if (monitor == null) {
        System.out.println("monitor = null");
        continue;
      }
      
      try {
        System.out.println("monitor.getName()"+ monitor.getName());
      } catch (CorruptDataException e) {
        assertNotNull(e.getCorruptData());
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
      
      System.out.println("\nmonitor.getEntersWaiters():");
      
      Iterator enters = monitor.getEnterWaiters().iterator();
      
      while (enters.hasNext()) {
        Object next = enters.next();
        
        if (next instanceof CorruptData) {
          System.out.println("enter waiter corrupt: "+ next);
          continue;
        }
        
        JavaThread thread = (JavaThread) next;
        
        try {
          System.out.println("EnterWaiter: "+thread.getName());
        } catch (CorruptDataException e) {
          assertNotNull(e.getCorruptData());
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
                
                
      }
      
      System.out.println("\nmonitor.getNotifyWaiters():");
      
      Iterator notifiers = monitor.getNotifyWaiters().iterator();
      
      while (notifiers.hasNext()) {
        Object next = notifiers.next();
        
        if (next instanceof CorruptData) {
          System.out.println("notify waiter corrupt: "+ next);
          continue;
        }
        
        JavaThread thread = (JavaThread) next;
        
        try {
          System.out.println("NotifyWaiter: "+thread.getName());
        } catch (CorruptDataException e) {
          assertNotNull(e.getCorruptData());
          // TODO Auto-generated catch block
          e.printStackTrace();
        }                
      }
      
      JavaThread thread;
      try {
        thread = monitor.getOwner();
        if (thread == null) {
          System.out.println("Owner thread = null");
        } else {
          try {
            System.out.println("Owner thread = "+thread.getName());

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      // Ignore corrupt data
      if (next instanceof CorruptData) {
        continue;
      }


      JavaMonitor monitorCandidate = (JavaMonitor) next;
      
      //System.out.println("Monitor candidate->"+monitorCandidate.getName());
      JavaObject monitorObjectCandidate = monitorCandidate.getObject();


      if (monitorObjectCandidate != null) {
        JavaClass monitorClass = monitorObjectCandidate.getJavaClass();
        if (!SetupJavaMonitor_ObjectMonitors.monitorClassName.equals(monitorClass.getName())) {
          continue;

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      }
    }
  }


  public void testFindMonitor_0_1_1() throws Exception {
    JavaMonitor monitor = (JavaMonitor) setup.findMonitorThreadConfig(0, 1, 1).getMonitor();


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

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


  public void testGetID_0_1_1() throws Exception {
    JavaMonitor monitor = (JavaMonitor) setup.findMonitorThreadConfig(0, 1, 1).getMonitor();


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

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