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

Example 51 with NotificationListener

use of javax.management.NotificationListener in project graylog2-server by Graylog2.

the class GarbageCollectionWarningThread method doRun.

@Override
public void doRun() {
    for (final GarbageCollectorMXBean gc : garbageCollectors) {
        switch(gc.getName()) {
            case "ParNew":
            case "ConcurrentMarkSweep":
                LOG.debug("Skipping GC warning listener for concurrent collector {}.", gc.getName());
                continue;
        }
        LOG.debug("Installing GC warning listener for collector {}, total runtime threshold is {}.", gc.getName(), gcWarningThreshold);
        final NotificationEmitter emitter = (NotificationEmitter) gc;
        final NotificationListener listener = new NotificationListener() {

            @SuppressForbidden("Deliberate usage of GcInfo and GarbageCollectionNotificationInfo")
            @Override
            public void handleNotification(javax.management.Notification notification, Object handback) {
                if (GarbageCollectionNotificationInfo.GARBAGE_COLLECTION_NOTIFICATION.equals(notification.getType())) {
                    final GcInfo gcInfo = GarbageCollectionNotificationInfo.from((CompositeData) notification.getUserData()).getGcInfo();
                    final Duration duration = Duration.milliseconds(gcInfo.getDuration());
                    if (duration.compareTo(gcWarningThreshold) > 0) {
                        LOG.warn("Last GC run with {} took longer than {} (last duration={})", gc.getName(), gcWarningThreshold, duration);
                        final Notification systemNotification = notificationService.buildNow().addNode(nodeId.toString()).addTimestamp(Tools.nowUTC()).addSeverity(Notification.Severity.URGENT).addType(Notification.Type.GC_TOO_LONG).addDetail("gc_name", gc.getName()).addDetail("gc_duration_ms", duration.toMilliseconds()).addDetail("gc_threshold_ms", gcWarningThreshold.toMilliseconds()).addDetail("gc_collection_count", gc.getCollectionCount()).addDetail("gc_collection_time", gc.getCollectionTime());
                        if (!notificationService.publishIfFirst(systemNotification)) {
                            LOG.debug("Couldn't publish notification: {}", notification);
                        }
                    }
                }
            }
        };
        emitter.addNotificationListener(listener, null, null);
    }
}