Java Code Examples for javax.management.MBeanServer#addNotificationListener()

/**
 * Sets up event listeners for this MBean as described in the descriptor.
 * The descriptor contains a map with layout
 * {item -> Map[event:"...", from:ObjectName, callback:&Closure],...,}
 *
 * @param server     the MBeanServer is to be registered.
 * @param descriptor a map containing info about the event
 */
public void addEventListeners(MBeanServer server, Map<String, Map<String, Object>> descriptor) {
    for (Map.Entry<String, Map<String, Object>> item : descriptor.entrySet()) {
        Map<String, Object> listener = item.getValue();

        // register with server
        ObjectName broadcaster = (ObjectName) listener.get("from");
        try {
            String eventType = (String) listener.get("event");

            if (eventType != null) {
                NotificationFilterSupport filter = new NotificationFilterSupport();
                filter.enableType(eventType);
                server.addNotificationListener(broadcaster, JmxEventListener.getListener(), filter, listener);
            } else {
                server.addNotificationListener(broadcaster, JmxEventListener.getListener(), null, listener);
            }
        } catch (InstanceNotFoundException e) {
            throw new JmxBuilderException(e);
        }
    }
}
 

@Test
public void testJmxListener() throws Exception {
    final StringBuilder result = new StringBuilder();
    NotificationListener listener = new NotificationListener() {
        @Override
        public void handleNotification(Notification notification, Object handback) {
            result.append(notification.getType());
        }
    };
    MBeanServer platformMBeanServer = ManagementFactory.getPlatformMBeanServer();
    platformMBeanServer.addNotificationListener(JavaMailJMSStatistics.JMX_OBJECT_NAME, listener, null, this);
    javaMailJMSStatistics.onSuccess(mimeMessage, addressesTo);
    // cleanup
    platformMBeanServer.removeNotificationListener(JavaMailJMSStatistics.JMX_OBJECT_NAME, listener);
    // check
    assertEquals(JavaMailJMSStatistics.NOTIFICATION_TYPE_SUCCESS, result.toString());
}
 

public static boolean register() {
    try {
        MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();

        // Get the list of MX
        List<GarbageCollectorMXBean> gc_mxbeans = ManagementFactory.getGarbageCollectorMXBeans();

        // Create the notification listener
        GCNotificationListener gcNotificationListener = new GCNotificationListener();

        for (GarbageCollectorMXBean gcbean : gc_mxbeans) {
          // Add notification listener for the MXBean
          mbeanServer.addNotificationListener(gcbean.getObjectName(), gcNotificationListener, null, null);
        }
    } catch (Exception ex) {
        System.err.println("Exception during mbean registration:" + ex);
        ex.printStackTrace();
        // We've failed to set up, terminate
        return false;
    }

    return true;
}
 

public static void register() throws Exception
{
    GCInspector inspector = new GCInspector();
    MBeanServer server = ManagementFactory.getPlatformMBeanServer();
    ObjectName gcName = new ObjectName(ManagementFactory.GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE + ",*");
    for (ObjectName name : server.queryNames(gcName, null))
    {
        server.addNotificationListener(name, inspector, null, null);
    }
}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new StringMonitor(), monitorName);
    final StringMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, StringMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setStringToCompare("old");
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotifyDiffer(true);
    monitorProxy.start();

    final int initGetCount = observedProxy.getGetCount();
    int getCount = initGetCount;
    for (int i = 0; i < 500; i++) { // 500 * 10 = 5 seconds
        getCount = observedProxy.getGetCount();
        if (getCount != initGetCount)
            break;
        Thread.sleep(10);
    }
    if (getCount <= initGetCount)
        throw new Exception("Test failed: presumable deadlock");
    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing("new");
        for (int i = 0; i < 500 && notifCount.get() == 0; i++)
            Thread.sleep(10);
        if (notifCount.get() == 0)
            throw new Exception("Test failed: presumable deadlock");
    }

}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new StringMonitor(), monitorName);
    final StringMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, StringMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setStringToCompare("old");
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotifyDiffer(true);

    final int initGetCount = observedProxy.getGetCount();
    monitorProxy.start();

    int getCount = initGetCount;
    for (int i = 0; i < 500; i++) { // 500 * 10 = 5 seconds
        getCount = observedProxy.getGetCount();
        if (getCount != initGetCount)
            break;
        Thread.sleep(10);
    }
    if (getCount <= initGetCount)
        throw new Exception("Test failed: presumable deadlock");
    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing("new");
        for (int i = 0; i < 500 && notifCount.get() == 0; i++)
            Thread.sleep(10);
        if (notifCount.get() == 0)
            throw new Exception("Test failed: presumable deadlock");
    }

}
 

public static void main(String[] args) throws Exception {
    MBeanServer mbs = MBeanServerFactory.newMBeanServer();
    ObjectName relSvcName = new ObjectName("a:type=relationService");
    RelationServiceMBean relSvc =
            JMX.newMBeanProxy(mbs, relSvcName, RelationServiceMBean.class);
    mbs.createMBean("javax.management.relation.RelationService",
                    relSvcName,
                    new Object[] {Boolean.TRUE},
                    new String[] {"boolean"});

    final BlockingQueue<Notification> q =
            new ArrayBlockingQueue<Notification>(100);
    NotificationListener qListener = new NotificationListener() {
        public void handleNotification(Notification notification,
                                       Object handback) {
            q.add(notification);
        }
    };
    mbs.addNotificationListener(relSvcName, qListener, null, null);

    RoleInfo leftInfo =
        new RoleInfo("left", "javax.management.timer.TimerMBean");
    RoleInfo rightInfo =
        new RoleInfo("right", "javax.management.timer.Timer");
    relSvc.createRelationType("typeName", new RoleInfo[] {leftInfo, rightInfo});
    ObjectName timer1 = new ObjectName("a:type=timer,number=1");
    ObjectName timer2 = new ObjectName("a:type=timer,number=2");
    mbs.createMBean("javax.management.timer.Timer", timer1);
    mbs.createMBean("javax.management.timer.Timer", timer2);

    Role leftRole =
        new Role("left", Arrays.asList(new ObjectName[] {timer1}));
    Role rightRole =
        new Role("right", Arrays.asList(new ObjectName[] {timer2}));
    RoleList roles =
        new RoleList(Arrays.asList(new Role[] {leftRole, rightRole}));

    final int NREPEAT = 10;

    for (int i = 0; i < NREPEAT; i++) {
        relSvc.createRelation("relationName", "typeName", roles);
        relSvc.removeRelation("relationName");
    }

    Notification firstNotif = q.remove();
    long seqNo = firstNotif.getSequenceNumber();
    for (int i = 0; i < NREPEAT * 2 - 1; i++) {
        Notification n = q.remove();
        long nSeqNo = n.getSequenceNumber();
        if (nSeqNo != seqNo + 1) {
            throw new Exception(
                    "TEST FAILED: expected seqNo " + (seqNo + 1) + "; got " +
                    nSeqNo);
        }
        seqNo++;
    }
    System.out.println("TEST PASSED: got " + (NREPEAT * 2) + " notifications " +
            "with contiguous sequence numbers");
}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new CounterMonitor(), monitorName);
    final CounterMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, CounterMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setInitThreshold(100);
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotify(true);

    final int initGetCount = observedProxy.getGetCount();
    monitorProxy.start();

    System.out.println("Checking GetCount, possible deadlock if timeout.");
    do { // 8038322. Until timeout of testing harness
        Thread.sleep(200);
    } while ((observedProxy.getGetCount()) == initGetCount);
    System.out.println("Done!");

    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing(1000);
        System.out.println("Waiting notifCount.get() != 0, possible deadlock if timeout.");
        do {
            Thread.sleep(200);
        } while(notifCount.get() == 0); // 8038322. Until timeout of testing harness
        System.out.println("Done");
    }

}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new StringMonitor(), monitorName);
    final StringMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, StringMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setStringToCompare("old");
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotifyDiffer(true);

    final int initGetCount = observedProxy.getGetCount();
    monitorProxy.start();

    int getCount = initGetCount;
    for (int i = 0; i < 500; i++) { // 500 * 10 = 5 seconds
        getCount = observedProxy.getGetCount();
        if (getCount != initGetCount)
            break;
        Thread.sleep(10);
    }
    if (getCount <= initGetCount)
        throw new Exception("Test failed: presumable deadlock");
    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing("new");
        for (int i = 0; i < 500 && notifCount.get() == 0; i++)
            Thread.sleep(10);
        if (notifCount.get() == 0)
            throw new Exception("Test failed: presumable deadlock");
    }

}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new CounterMonitor(), monitorName);
    final CounterMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, CounterMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setInitThreshold(100);
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotify(true);

    final int initGetCount = observedProxy.getGetCount();
    monitorProxy.start();

    System.out.println("Checking GetCount, possible deadlock if timeout.");
    do { // 8038322. Until timeout of testing harness
        Thread.sleep(200);
    } while ((observedProxy.getGetCount()) == initGetCount);
    System.out.println("Done!");

    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing(1000);
        System.out.println("Waiting notifCount.get() != 0, possible deadlock if timeout.");
        do {
            Thread.sleep(200);
        } while(notifCount.get() == 0); // 8038322. Until timeout of testing harness
        System.out.println("Done");
    }

}
 

private void testOperation(MBeanServer mbs, final Greeter greeter, ObjectName clientEndpointName,
    ObjectName serverEndpointName, String sseqId, String dseqId) throws ReflectionException,
    InstanceNotFoundException, MBeanException, InterruptedException {
    AcknowledgementListener listener = new AcknowledgementListener();
    mbs.addNotificationListener(clientEndpointName, listener, null, null);
    Object o;
    o = mbs.invoke(serverEndpointName, "getSourceSequenceIds",
                   new Object[]{true}, ONEBOOLEAN_SIGNATURE);
    verifyArray("Expected sequence identifier", o, new String[]{dseqId}, false);

    o = mbs.invoke(clientEndpointName, "getQueuedMessageTotalCount",
                   new Object[]{true}, ONEBOOLEAN_SIGNATURE);
    assertTrue("No queued message", o instanceof Integer && 0 == ((Integer)o).intValue());

    o = mbs.invoke(clientEndpointName, "getQueuedMessageCount",
                   new Object[]{sseqId, true}, new String[]{"java.lang.String", "boolean"});
    assertTrue("No queued message", o instanceof Integer && 0 == ((Integer)o).intValue());

    o = mbs.invoke(clientEndpointName, "getCurrentSourceSequence", null, null);
    verifySourceSequence(o, sseqId, 1, 0);

    o = mbs.invoke(clientEndpointName, "getSourceSequences",
                   new Object[]{true}, ONEBOOLEAN_SIGNATURE);
    assertTrue("One sequence message", o instanceof CompositeData[] && 1 == ((CompositeData[])o).length);
    verifySourceSequence(((CompositeData[])o)[0], sseqId, 1, 0);

    o = mbs.invoke(clientEndpointName, "getSourceSequenceAcknowledgedRange",
                   new Object[]{sseqId}, ONESTRING_SIGNATURE);
    verifyArray("Expected range", o, new Long[]{1L, 1L}, true);

    o = mbs.invoke(clientEndpointName, "getUnAcknowledgedMessageIdentifiers",
                   new Object[]{sseqId}, ONESTRING_SIGNATURE);
    assertTrue("No unacknowledged message", o instanceof Long[] && 0 == ((Long[])o).length);

    greeter.greetMeOneWay("two"); // getting lost
    greeter.greetMeOneWay("three"); // sent

    o = mbs.invoke(clientEndpointName, "getQueuedMessageTotalCount",
                   new Object[]{true}, ONEBOOLEAN_SIGNATURE);
    assertTrue("One queued message", o instanceof Integer && 1 == ((Integer)o).intValue());

    o = mbs.invoke(clientEndpointName, "getSourceSequenceAcknowledgedRange",
                   new Object[]{sseqId}, ONESTRING_SIGNATURE);
    verifyArray("Expected range", o, new Long[]{1L, 1L, 3L, 3L}, true);
    assertEquals(3L, listener.getLastAcknowledgement());

    o = mbs.invoke(clientEndpointName, "getUnAcknowledgedMessageIdentifiers",
                   new Object[]{sseqId}, ONESTRING_SIGNATURE);
    assertTrue("One unacknowledged message", o instanceof Long[] && 1 == ((Long[])o).length);

    o = mbs.invoke(clientEndpointName, "getRetransmissionStatus",
                   new Object[]{sseqId, 2}, new String[]{"java.lang.String", "long"});
    verifyRetransmissionStatus(o, 2L, 0);

    o = mbs.invoke(serverEndpointName, "getDestinationSequenceAcknowledgedRange",
                   new Object[]{sseqId}, ONESTRING_SIGNATURE);
    verifyArray("Expected range", o, new Long[]{1L, 1L, 3L, 3L}, true);

    // 3 sec retry interval
    LOG.info("waiting for 3 secs for the retry to complete ...");
    Thread.sleep(3000L);

    o = mbs.invoke(clientEndpointName, "getQueuedMessageTotalCount",
                   new Object[]{true}, ONEBOOLEAN_SIGNATURE);
    assertTrue(o instanceof Integer);
    int count = 0;
    while (((Integer)o).intValue() > 0) {
        Thread.sleep(200L);
        count++;
        if (count > 20) {
            fail("Failed to empty the resend queue");
        }
        o = mbs.invoke(clientEndpointName, "getQueuedMessageTotalCount",
                       new Object[]{true}, ONEBOOLEAN_SIGNATURE);
        assertTrue(o instanceof Integer);
    }
    assertTrue("No queued message " + o, o instanceof Integer && 0 == ((Integer)o).intValue());
    assertEquals(2L, listener.getLastAcknowledgement());

    o = mbs.invoke(clientEndpointName, "getSourceSequenceAcknowledgedRange",
                   new Object[]{sseqId}, ONESTRING_SIGNATURE);
    verifyArray("Expected range", o, new Long[]{1L, 3L}, true);

    o = mbs.invoke(serverEndpointName, "getDestinationSequenceAcknowledgedRange",
                   new Object[]{sseqId}, ONESTRING_SIGNATURE);
    verifyArray("Expected range", o, new Long[]{1L, 3L}, true);

    o = mbs.invoke(clientEndpointName, "getUnAcknowledgedMessageIdentifiers",
                   new Object[]{sseqId}, ONESTRING_SIGNATURE);
    assertTrue("No unacknowledged message", o instanceof Long[] && 0 == ((Long[])o).length);
}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new CounterMonitor(), monitorName);
    final CounterMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, CounterMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setInitThreshold(100);
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotify(true);

    final int initGetCount = observedProxy.getGetCount();
    monitorProxy.start();

    System.out.println("Checking GetCount, possible deadlock if timeout.");
    do { // 8038322. Until timeout of testing harness
        Thread.sleep(200);
    } while ((observedProxy.getGetCount()) == initGetCount);
    System.out.println("Done!");

    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing(1000);
        System.out.println("Waiting notifCount.get() != 0, possible deadlock if timeout.");
        do {
            Thread.sleep(200);
        } while(notifCount.get() == 0); // 8038322. Until timeout of testing harness
        System.out.println("Done");
    }

}
 

public static void main(String[] args) throws Exception {
    MBeanServer mbs = MBeanServerFactory.newMBeanServer();
    ObjectName relSvcName = new ObjectName("a:type=relationService");
    RelationServiceMBean relSvc =
            JMX.newMBeanProxy(mbs, relSvcName, RelationServiceMBean.class);
    mbs.createMBean("javax.management.relation.RelationService",
                    relSvcName,
                    new Object[] {Boolean.TRUE},
                    new String[] {"boolean"});

    final BlockingQueue<Notification> q =
            new ArrayBlockingQueue<Notification>(100);
    NotificationListener qListener = new NotificationListener() {
        public void handleNotification(Notification notification,
                                       Object handback) {
            q.add(notification);
        }
    };
    mbs.addNotificationListener(relSvcName, qListener, null, null);

    RoleInfo leftInfo =
        new RoleInfo("left", "javax.management.timer.TimerMBean");
    RoleInfo rightInfo =
        new RoleInfo("right", "javax.management.timer.Timer");
    relSvc.createRelationType("typeName", new RoleInfo[] {leftInfo, rightInfo});
    ObjectName timer1 = new ObjectName("a:type=timer,number=1");
    ObjectName timer2 = new ObjectName("a:type=timer,number=2");
    mbs.createMBean("javax.management.timer.Timer", timer1);
    mbs.createMBean("javax.management.timer.Timer", timer2);

    Role leftRole =
        new Role("left", Arrays.asList(new ObjectName[] {timer1}));
    Role rightRole =
        new Role("right", Arrays.asList(new ObjectName[] {timer2}));
    RoleList roles =
        new RoleList(Arrays.asList(new Role[] {leftRole, rightRole}));

    final int NREPEAT = 10;

    for (int i = 0; i < NREPEAT; i++) {
        relSvc.createRelation("relationName", "typeName", roles);
        relSvc.removeRelation("relationName");
    }

    Notification firstNotif = q.remove();
    long seqNo = firstNotif.getSequenceNumber();
    for (int i = 0; i < NREPEAT * 2 - 1; i++) {
        Notification n = q.remove();
        long nSeqNo = n.getSequenceNumber();
        if (nSeqNo != seqNo + 1) {
            throw new Exception(
                    "TEST FAILED: expected seqNo " + (seqNo + 1) + "; got " +
                    nSeqNo);
        }
        seqNo++;
    }
    System.out.println("TEST PASSED: got " + (NREPEAT * 2) + " notifications " +
            "with contiguous sequence numbers");
}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new GaugeMonitor(), monitorName);
    final GaugeMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, GaugeMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setThresholds(105, 100);
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotifyHigh(true);
    monitorProxy.setNotifyLow(true);
    monitorProxy.start();

    final int initGetCount = observedProxy.getGetCount();
    int getCount = initGetCount;
    for (int i = 0; i < 2000; i++) { // 2000 * 10 = 20 seconds
        getCount = observedProxy.getGetCount();
        if (getCount != initGetCount)
            break;
        Thread.sleep(10);
    }
    if (getCount <= initGetCount)
        throw new Exception("Test failed: presumable deadlock");
    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing(1000);
        for (int i = 0; i < 2000 && notifCount.get() == 0; i++)
            Thread.sleep(10);
        if (notifCount.get() == 0)
            throw new Exception("Test failed: presumable deadlock");
    }

}
 

public static void main(String[] args) throws Exception {
    MBeanServer mbs = MBeanServerFactory.newMBeanServer();
    ObjectName relSvcName = new ObjectName("a:type=relationService");
    RelationServiceMBean relSvc =
            JMX.newMBeanProxy(mbs, relSvcName, RelationServiceMBean.class);
    mbs.createMBean("javax.management.relation.RelationService",
                    relSvcName,
                    new Object[] {Boolean.TRUE},
                    new String[] {"boolean"});

    final BlockingQueue<Notification> q =
            new ArrayBlockingQueue<Notification>(100);
    NotificationListener qListener = new NotificationListener() {
        public void handleNotification(Notification notification,
                                       Object handback) {
            q.add(notification);
        }
    };
    mbs.addNotificationListener(relSvcName, qListener, null, null);

    RoleInfo leftInfo =
        new RoleInfo("left", "javax.management.timer.TimerMBean");
    RoleInfo rightInfo =
        new RoleInfo("right", "javax.management.timer.Timer");
    relSvc.createRelationType("typeName", new RoleInfo[] {leftInfo, rightInfo});
    ObjectName timer1 = new ObjectName("a:type=timer,number=1");
    ObjectName timer2 = new ObjectName("a:type=timer,number=2");
    mbs.createMBean("javax.management.timer.Timer", timer1);
    mbs.createMBean("javax.management.timer.Timer", timer2);

    Role leftRole =
        new Role("left", Arrays.asList(new ObjectName[] {timer1}));
    Role rightRole =
        new Role("right", Arrays.asList(new ObjectName[] {timer2}));
    RoleList roles =
        new RoleList(Arrays.asList(new Role[] {leftRole, rightRole}));

    final int NREPEAT = 10;

    for (int i = 0; i < NREPEAT; i++) {
        relSvc.createRelation("relationName", "typeName", roles);
        relSvc.removeRelation("relationName");
    }

    Notification firstNotif = q.remove();
    long seqNo = firstNotif.getSequenceNumber();
    for (int i = 0; i < NREPEAT * 2 - 1; i++) {
        Notification n = q.remove();
        long nSeqNo = n.getSequenceNumber();
        if (nSeqNo != seqNo + 1) {
            throw new Exception(
                    "TEST FAILED: expected seqNo " + (seqNo + 1) + "; got " +
                    nSeqNo);
        }
        seqNo++;
    }
    System.out.println("TEST PASSED: got " + (NREPEAT * 2) + " notifications " +
            "with contiguous sequence numbers");
}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new StringMonitor(), monitorName);
    final StringMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, StringMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setStringToCompare("old");
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotifyDiffer(true);
    monitorProxy.start();

    final int initGetCount = observedProxy.getGetCount();
    int getCount = initGetCount;
    for (int i = 0; i < 500; i++) { // 500 * 10 = 5 seconds
        getCount = observedProxy.getGetCount();
        if (getCount != initGetCount)
            break;
        Thread.sleep(10);
    }
    if (getCount <= initGetCount)
        throw new Exception("Test failed: presumable deadlock");
    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing("new");
        for (int i = 0; i < 500 && notifCount.get() == 0; i++)
            Thread.sleep(10);
        if (notifCount.get() == 0)
            throw new Exception("Test failed: presumable deadlock");
    }

}
 

public static void main(String[] args) throws Exception {
    MBeanServer mbs = MBeanServerFactory.newMBeanServer();
    ObjectName relSvcName = new ObjectName("a:type=relationService");
    RelationServiceMBean relSvc =
            JMX.newMBeanProxy(mbs, relSvcName, RelationServiceMBean.class);
    mbs.createMBean("javax.management.relation.RelationService",
                    relSvcName,
                    new Object[] {Boolean.TRUE},
                    new String[] {"boolean"});

    final BlockingQueue<Notification> q =
            new ArrayBlockingQueue<Notification>(100);
    NotificationListener qListener = new NotificationListener() {
        public void handleNotification(Notification notification,
                                       Object handback) {
            q.add(notification);
        }
    };
    mbs.addNotificationListener(relSvcName, qListener, null, null);

    RoleInfo leftInfo =
        new RoleInfo("left", "javax.management.timer.TimerMBean");
    RoleInfo rightInfo =
        new RoleInfo("right", "javax.management.timer.Timer");
    relSvc.createRelationType("typeName", new RoleInfo[] {leftInfo, rightInfo});
    ObjectName timer1 = new ObjectName("a:type=timer,number=1");
    ObjectName timer2 = new ObjectName("a:type=timer,number=2");
    mbs.createMBean("javax.management.timer.Timer", timer1);
    mbs.createMBean("javax.management.timer.Timer", timer2);

    Role leftRole =
        new Role("left", Arrays.asList(new ObjectName[] {timer1}));
    Role rightRole =
        new Role("right", Arrays.asList(new ObjectName[] {timer2}));
    RoleList roles =
        new RoleList(Arrays.asList(new Role[] {leftRole, rightRole}));

    final int NREPEAT = 10;

    for (int i = 0; i < NREPEAT; i++) {
        relSvc.createRelation("relationName", "typeName", roles);
        relSvc.removeRelation("relationName");
    }

    Notification firstNotif = q.remove();
    long seqNo = firstNotif.getSequenceNumber();
    for (int i = 0; i < NREPEAT * 2 - 1; i++) {
        Notification n = q.remove();
        long nSeqNo = n.getSequenceNumber();
        if (nSeqNo != seqNo + 1) {
            throw new Exception(
                    "TEST FAILED: expected seqNo " + (seqNo + 1) + "; got " +
                    nSeqNo);
        }
        seqNo++;
    }
    System.out.println("TEST PASSED: got " + (NREPEAT * 2) + " notifications " +
            "with contiguous sequence numbers");
}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new GaugeMonitor(), monitorName);
    final GaugeMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, GaugeMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setThresholds(105, 100);
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotifyHigh(true);
    monitorProxy.setNotifyLow(true);
    monitorProxy.start();

    final int initGetCount = observedProxy.getGetCount();
    int getCount = initGetCount;
    for (int i = 0; i < 2000; i++) { // 2000 * 10 = 20 seconds
        getCount = observedProxy.getGetCount();
        if (getCount != initGetCount)
            break;
        Thread.sleep(10);
    }
    if (getCount <= initGetCount)
        throw new Exception("Test failed: presumable deadlock");
    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing(1000);
        for (int i = 0; i < 2000 && notifCount.get() == 0; i++)
            Thread.sleep(10);
        if (notifCount.get() == 0)
            throw new Exception("Test failed: presumable deadlock");
    }

}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new CounterMonitor(), monitorName);
    final CounterMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, CounterMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setInitThreshold(100);
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotify(true);
    monitorProxy.start();

    final int initGetCount = observedProxy.getGetCount();
    int getCount = initGetCount;
    for (int i = 0; i < 500; i++) { // 500 * 10 = 5 seconds
        getCount = observedProxy.getGetCount();
        if (getCount != initGetCount)
            break;
        Thread.sleep(10);
    }
    if (getCount <= initGetCount)
        throw new Exception("Test failed: presumable deadlock");
    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing(1000);
        for (int i = 0; i < 500 && notifCount.get() == 0; i++)
            Thread.sleep(10);
        if (notifCount.get() == 0)
            throw new Exception("Test failed: presumable deadlock");
    }

}
 

void run() throws Exception {
    final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
    final ObjectName observedName = new ObjectName("a:b=c");
    final ObjectName monitorName = new ObjectName("a:type=Monitor");
    mbs.registerMBean(new StringMonitor(), monitorName);
    final StringMonitorMBean monitorProxy =
        JMX.newMBeanProxy(mbs, monitorName, StringMonitorMBean.class);
    final TestMBean observedProxy =
        JMX.newMBeanProxy(mbs, observedName, TestMBean.class);

    final Runnable sensitiveThing = new Runnable() {
        public void run() {
            doSensitiveThing(monitorProxy, observedName);
        }
    };

    final Runnable nothing = new Runnable() {
        public void run() {}
    };

    final Runnable withinGetAttribute =
        (when == When.IN_GET_ATTRIBUTE) ? sensitiveThing : nothing;

    mbs.registerMBean(new Test(withinGetAttribute), observedName);
    monitorProxy.addObservedObject(observedName);
    monitorProxy.setObservedAttribute("Thing");
    monitorProxy.setStringToCompare("old");
    monitorProxy.setGranularityPeriod(10L); // 10 ms
    monitorProxy.setNotifyDiffer(true);

    final int initGetCount = observedProxy.getGetCount();
    monitorProxy.start();

    int getCount = initGetCount;
    for (int i = 0; i < 500; i++) { // 500 * 10 = 5 seconds
        getCount = observedProxy.getGetCount();
        if (getCount != initGetCount)
            break;
        Thread.sleep(10);
    }
    if (getCount <= initGetCount)
        throw new Exception("Test failed: presumable deadlock");
    // This won't show up as a deadlock in CTRL-\ or in
    // ThreadMXBean.findDeadlockedThreads(), because they don't
    // see that thread A is waiting for thread B (B.join()), and
    // thread B is waiting for a lock held by thread A

    // Now we know the monitor has observed the initial value,
    // so if we want to test notify behaviour we can trigger by
    // exceeding the threshold.
    if (when == When.IN_NOTIFY) {
        final AtomicInteger notifCount = new AtomicInteger();
        final NotificationListener listener = new NotificationListener() {
            public void handleNotification(Notification n, Object h) {
                Thread t = new Thread(sensitiveThing);
                t.start();
                try {
                    t.join();
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
                notifCount.incrementAndGet();
            }
        };
        mbs.addNotificationListener(monitorName, listener, null, null);
        observedProxy.setThing("new");
        for (int i = 0; i < 500 && notifCount.get() == 0; i++)
            Thread.sleep(10);
        if (notifCount.get() == 0)
            throw new Exception("Test failed: presumable deadlock");
    }

}