Examples with NotificationListener javax.management.NotificationListener used on opensource projects

Example 16 with NotificationListener

use of javax.management.NotificationListener in project dsl-devkit by dsldevkit.

the class VirtualMachineTracer method start.

/**
 * Installs a listener that will publish all full GC events as {@link FullGarbageCollectionEvent} objects.
 */
public void start() {
    // This code only works with Oracle HotSpot JVM as there is no standard API to retrieve information about GC events
    if (!isHotSpotVM()) {
        return;
    }
    long vmStartTime = getApproximateNanoStartTime();
    for (GarbageCollectorMXBean gcBean : ManagementFactory.getGarbageCollectorMXBeans()) {
        Class<? extends TraceEvent> eventType = // $NON-NLS-1$ //$NON-NLS-2$
        gcBean.getName().equals("ConcurrentMarkSweep") || gcBean.getName().equals("MarkSweepCompact") ? FullGarbageCollectionEvent.class : MinorGarbageCollectionEvent.class;
        NotificationEmitter emitter = (NotificationEmitter) gcBean;
        NotificationListener listener = new NotificationListener() {

            @Override
            public void handleNotification(final Notification notification, final Object handback) {
                try {
                    // we only handle GARBAGE_COLLECTION_NOTIFICATION notifications here
                    if (notification.getType().equals("com.sun.management.gc.notification")) {
                        // $NON-NLS-1$
                        CompositeData cd = (CompositeData) notification.getUserData();
                        // $NON-NLS-1$
                        String gcAction = (String) cd.get("gcAction");
                        // $NON-NLS-1$
                        String gcCause = (String) cd.get("gcCause");
                        // $NON-NLS-1$
                        CompositeData gcInfo = (CompositeData) cd.get("gcInfo");
                        // $NON-NLS-1$
                        long startTime = TimeUnit.NANOSECONDS.convert((Long) gcInfo.get("startTime"), TimeUnit.MILLISECONDS);
                        // $NON-NLS-1$
                        long duration = TimeUnit.NANOSECONDS.convert((Long) gcInfo.get("duration"), TimeUnit.MILLISECONDS);
                        if (duration > 0) {
                            // "startTime" and "duration" are relative to VM start time
                            traceSet.started(eventType, vmStartTime + startTime, gcAction, gcCause);
                            traceSet.ended(eventType, vmStartTime + startTime + duration);
                        }
                    }
                } catch (InvalidKeyException e) {
                // ignore
                }
            }
        };
        emitter.addNotificationListener(listener, null, null);
        gcListenerMap.put(emitter, listener);
    }
}

Example 17 with NotificationListener

use of javax.management.NotificationListener in project openj9 by eclipse.

the class GarbageCollectionNotificationTest method beforeTest.

@BeforeTest
public void beforeTest() {
    // get all GarbageCollectorMXBeans
    List<GarbageCollectorMXBean> gcBeans = ManagementFactory.getGarbageCollectorMXBeans();
    // register every GarbageCollectorMXBean
    for (GarbageCollectorMXBean gcBean : gcBeans) {
        gcStates.put(gcBean.getName(), new GCState(gcBean, assumeGCIsPartiallyConcurrent(gcBean), assumeGCIsOldGen(gcBean)));
        NotificationEmitter emitter = (NotificationEmitter) gcBean;
        // new listener
        NotificationListener listener = new NotificationListener() {

            // record total gc time spend
            long totalGcTimeSpend = 0;

            @Override
            public void handleNotification(Notification notification, Object handback) {
                HandBack handBack = (HandBack) handback;
                // get gc info
                GarbageCollectionNotificationInfo info = GarbageCollectionNotificationInfo.from((CompositeData) notification.getUserData());
                // output
                // get a glance of gc
                StringBuilder gcGlance = new StringBuilder();
                String gcName = info.getGcName();
                GCState gcState = gcStates.get(gcName);
                GcInfo gcInfo = info.getGcInfo();
                long gcId = gcInfo.getId();
                gcGlance.append(info.getGcAction()).append(" (").append(gcName).append(") : - ").append(gcId);
                gcGlance.append(" (").append(info.getGcCause()).append(") ");
                gcGlance.append("start: ").append(dateFormat.format(new Date(JVM_START_TIME + gcInfo.getStartTime())));
                gcGlance.append(", end: ").append(dateFormat.format(new Date(JVM_START_TIME + gcInfo.getEndTime())));
                logger.debug(gcGlance.toString());
                AssertJUnit.assertTrue("startTime(" + gcInfo.getStartTime() + ") should be smaller than endTime(" + gcInfo.getEndTime() + ").", gcInfo.getStartTime() <= gcInfo.getEndTime());
                if (0 != gcState.lastCollectionID) {
                    AssertJUnit.assertTrue("lastCollectionID+1(" + (gcState.lastCollectionID + 1) + ") should match gcId(" + gcId + ")", gcId == (gcState.lastCollectionID + 1));
                }
                gcState.lastCollectionID = gcId;
                gcState.totalCollectionCount += 1;
                gcState.totalCollectionDuration += gcInfo.getDuration();
                // memory info
                Map<String, MemoryUsage> beforeUsageMap = gcInfo.getMemoryUsageBeforeGc();
                Map<String, MemoryUsage> afterUsageMap = gcInfo.getMemoryUsageAfterGc();
                for (Map.Entry<String, MemoryUsage> entry : afterUsageMap.entrySet()) {
                    String name = entry.getKey();
                    MemoryUsage afterUsage = entry.getValue();
                    MemoryUsage beforeUsage = beforeUsageMap.get(name);
                    StringBuilder usage = new StringBuilder();
                    // $NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$
                    usage.append("\t[").append(String.format("%32s", name)).append("] \t");
                    // $NON-NLS-1$ //$NON-NLS-2$
                    usage.append("init:").append(afterUsage.getInit() / ONE_KBYTE).append("K;\t");
                    usage.append("used:").append(// $NON-NLS-1$
                    handBack.handUsage(beforeUsage.getUsed(), afterUsage.getUsed(), beforeUsage.getMax())).append(// $NON-NLS-1$
                    ";\t");
                    usage.append("committed: ").append(// $NON-NLS-1$
                    handBack.handUsage(beforeUsage.getCommitted(), afterUsage.getCommitted(), beforeUsage.getMax()));
                    logger.debug(usage.toString());
                }
                totalGcTimeSpend += gcInfo.getDuration();
                // summary
                long percent = (gcInfo.getEndTime() - totalGcTimeSpend) * 1000L / gcInfo.getEndTime();
                StringBuilder summary = new StringBuilder();
                summary.append("duration:").append(gcInfo.getDuration()).append("ms");
                // $NON-NLS-1$//$NON-NLS-2$
                summary.append(", throughput:").append((percent / 10)).append(".").append(percent % 10).append('%');
                logger.debug(summary.toString());
                logger.debug("\n");
            }
        };
        // add the listener
        emitter.addNotificationListener(listener, new NotificationFilter() {

            private static final long serialVersionUID = 3763793138186359389L;

            @Override
            public boolean isNotificationEnabled(Notification notification) {
                // filter GC notification
                return notification.getType().equals(GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION);
            }
        }, HandBack.getInstance());
    }
}

Example 18 with NotificationListener

use of javax.management.NotificationListener in project tomcat70 by apache.

the class ConnectionPool method notify.

/**
 * Return true if the notification was sent successfully, false otherwise.
 * @param type
 * @param message
 * @return true if the notification succeeded
 */
public boolean notify(final String type, String message) {
    try {
        Notification n = new Notification(type, this, sequence.incrementAndGet(), System.currentTimeMillis(), "[" + type + "] " + message);
        sendNotification(n);
        for (NotificationListener listener : listeners) {
            listener.handleNotification(n, this);
        }
        return true;
    } catch (Exception x) {
        if (log.isDebugEnabled()) {
            log.debug("Notify failed. Type=" + type + "; Message=" + message, x);
        }
        return false;
    }
}

Example 19 with NotificationListener

use of javax.management.NotificationListener in project deltaspike by apache.

the class SimpleRegistrationTest method checkMBean.

@Test
public void checkMBean() throws Exception {
    assertEquals(0, myMBean.getCounter());
    myMBean.resetTo(2);
    final ObjectName on = new ObjectName("org.apache.deltaspike:type=MBeans,name=" + MyMBean.class.getName());
    assertTrue(server.isRegistered(on));
    assertEquals(2, server.getAttribute(on, "counter"));
    assertEquals(6, server.invoke(on, "multiply", new Object[] { 3 }, new String[0]));
    myMBean.resetTo(5);
    assertEquals(5, server.getAttribute(on, "counter"));
    assertEquals(20, server.invoke(on, "multiply", new Object[] { 4 }, new String[0]));
    server.setAttribute(on, new Attribute("counter", 10));
    assertEquals(10, myMBean.getCounter());
    final Collection<Notification> notifications = new ArrayList<Notification>();
    server.addNotificationListener(on, new NotificationListener() {

        @Override
        public void handleNotification(final Notification notification, final Object handback) {
            notifications.add(notification);
        }
    }, null, null);
    myMBean.broadcast();
    assertEquals(1, notifications.size());
    assertEquals(10L, notifications.iterator().next().getSequenceNumber());
    MBeanInfo mBeanInfo = server.getMBeanInfo(on);
    Assert.assertNotNull(mBeanInfo);
    MBeanOperationInfo[] operations = mBeanInfo.getOperations();
    Assert.assertNotNull(operations);
    Assert.assertTrue(operations.length > 0);
    Assert.assertTrue("Empty Signature on operation: " + operations[1], operations[1].getSignature().length > 0);
    MBeanParameterInfo parameterInfo = operations[1].getSignature()[0];
    assertEquals("multiplier", parameterInfo.getName());
    assertEquals("the multiplier", parameterInfo.getDescription());
    {
        // table support - through map
        Object table = server.getAttribute(on, "table");
        assertTrue(TabularData.class.isInstance(table));
        final TabularData data = TabularData.class.cast(table);
        assertEquals(1, data.size());
        final CompositeData compositeData = CompositeData.class.cast(data.values().iterator().next());
        assertEquals(2, compositeData.values().size());
        assertEquals("value1", compositeData.get("key1"));
        assertEquals("value2", compositeData.get("key2"));
    }
    {
        // table support - through Table
        Object table = server.getAttribute(on, "table2");
        assertTrue(TabularData.class.isInstance(table));
        final TabularData data = TabularData.class.cast(table);
        assertEquals(2, data.size());
        final Iterator<?> iterator = data.values().iterator();
        {
            final CompositeData compositeData = CompositeData.class.cast(iterator.next());
            assertEquals(3, compositeData.values().size());
            assertEquals("1", compositeData.get("a"));
            assertEquals("2", compositeData.get("b"));
            assertEquals("3", compositeData.get("c"));
        }
        {
            final CompositeData compositeData = CompositeData.class.cast(iterator.next());
            assertEquals(3, compositeData.values().size());
            assertEquals("alpha", compositeData.get("a"));
            assertEquals("beta", compositeData.get("b"));
            assertEquals("gamma", compositeData.get("c"));
        }
    }
}

Example 20 with NotificationListener

use of javax.management.NotificationListener in project hive by apache.

the class HeapMemoryMonitor method start.

public void start() {
    // unsupported if null
    if (tenuredGenPool == null) {
        return;
    }
    MemoryMXBean mxBean = ManagementFactory.getMemoryMXBean();
    NotificationEmitter emitter = (NotificationEmitter) mxBean;
    notificationListener = (n, hb) -> {
        if (n.getType().equals(MemoryNotificationInfo.MEMORY_COLLECTION_THRESHOLD_EXCEEDED)) {
            long maxMemory = tenuredGenPool.getUsage().getMax();
            long usedMemory = tenuredGenPool.getUsage().getUsed();
            for (Listener listener : listeners) {
                listener.memoryUsageAboveThreshold(usedMemory, maxMemory);
            }
        }
    };
    emitter.addNotificationListener(notificationListener, null, null);
}