Java Code Examples for javax.management.monitor.StringMonitorMBean#setNotifyDiffer()

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Example 1
Source File: StringMonitorDeadlockTest.java    From dragonwell8_jdk with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 2
Source File: StringMonitorDeadlockTest.java    From TencentKona-8 with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 3
Source File: StringMonitorDeadlockTest.java    From jdk8u60 with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 4
Source File: StringMonitorDeadlockTest.java    From openjdk-jdk8u with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 5
Source File: StringMonitorDeadlockTest.java    From openjdk-jdk8u-backup with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 6
Source File: StringMonitorDeadlockTest.java    From openjdk-jdk9 with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 7
Source File: StringMonitorDeadlockTest.java    From jdk8u-jdk with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 8
Source File: StringMonitorDeadlockTest.java    From hottub with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 9
Source File: StringMonitorDeadlockTest.java    From openjdk-8-source with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 10
Source File: StringMonitorDeadlockTest.java    From openjdk-8 with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 11
Source File: StringMonitorDeadlockTest.java    From jdk8u_jdk with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 12
Source File: StringMonitorDeadlockTest.java    From jdk8u-jdk with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}
 
Example 13
Source File: StringMonitorDeadlockTest.java    From jdk8u-dev-jdk with GNU General Public License v2.0 4 votes vote down vote up
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");
    }

}