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

Example 1 with NotificationBroadcaster

use of javax.management.NotificationBroadcaster in project jdk8u_jdk by JetBrains.

the class DefaultMBeanServerInterceptor method removeNotificationListener.

private void removeNotificationListener(ObjectName name, NotificationListener listener, NotificationFilter filter, Object handback, boolean removeAll) throws InstanceNotFoundException, ListenerNotFoundException {
    if (MBEANSERVER_LOGGER.isLoggable(Level.FINER)) {
        MBEANSERVER_LOGGER.logp(Level.FINER, DefaultMBeanServerInterceptor.class.getName(), "removeNotificationListener", "ObjectName = " + name);
    }
    DynamicMBean instance = getMBean(name);
    checkMBeanPermission(instance, null, name, "removeNotificationListener");
    /* We could simplify the code by assigning broadcaster after
           assigning listenerWrapper, but that would change the error
           behavior when both the broadcaster and the listener are
           erroneous.  */
    Class<? extends NotificationBroadcaster> reqClass = removeAll ? NotificationBroadcaster.class : NotificationEmitter.class;
    NotificationBroadcaster broadcaster = getNotificationBroadcaster(name, instance, reqClass);
    NotificationListener listenerWrapper = getListenerWrapper(listener, name, instance, false);
    if (listenerWrapper == null)
        throw new ListenerNotFoundException("Unknown listener");
    if (removeAll)
        broadcaster.removeNotificationListener(listenerWrapper);
    else {
        NotificationEmitter emitter = (NotificationEmitter) broadcaster;
        emitter.removeNotificationListener(listenerWrapper, filter, handback);
    }
}

Example 2 with NotificationBroadcaster

use of javax.management.NotificationBroadcaster in project jdk8u_jdk by JetBrains.

the class StandardMBeanIntrospector method isDefinitelyImmutableInfo.

/* Return true if and only if we can be sure that the given MBean implementation
     * class has immutable MBeanInfo.  A Standard MBean that is a
     * NotificationBroadcaster is allowed to return different values at
     * different times from its getNotificationInfo() method, which is when
     * we might not know if it is immutable.  But if it is a subclass of
     * NotificationBroadcasterSupport and does not override
     * getNotificationInfo(), then we know it won't change.
     */
static boolean isDefinitelyImmutableInfo(Class<?> implClass) {
    if (!NotificationBroadcaster.class.isAssignableFrom(implClass))
        return true;
    synchronized (definitelyImmutable) {
        Boolean immutable = definitelyImmutable.get(implClass);
        if (immutable == null) {
            final Class<NotificationBroadcasterSupport> nbs = NotificationBroadcasterSupport.class;
            if (nbs.isAssignableFrom(implClass)) {
                try {
                    Method m = implClass.getMethod("getNotificationInfo");
                    immutable = (m.getDeclaringClass() == nbs);
                } catch (Exception e) {
                    // Too bad, we'll say no for now.
                    return false;
                }
            } else
                immutable = false;
            definitelyImmutable.put(implClass, immutable);
        }
        return immutable;
    }
}

Example 3 with NotificationBroadcaster

use of javax.management.NotificationBroadcaster in project jdk8u_jdk by JetBrains.

the class DefaultMBeanServerInterceptor method addNotificationListener.

/*
     * Notification handling.
     *
     * This is not trivial, because the MBeanServer translates the
     * source of a received notification from a reference to an MBean
     * into the ObjectName of that MBean.  While that does make
     * notification sending easier for MBean writers, it comes at a
     * considerable cost.  We need to replace the source of a
     * notification, which is basically wrong if there are also
     * listeners registered directly with the MBean (without going
     * through the MBean server).  We also need to wrap the listener
     * supplied by the client of the MBeanServer with a listener that
     * performs the substitution before forwarding.  This is why we
     * strongly discourage people from putting MBean references in the
     * source of their notifications.  Instead they should arrange to
     * put the ObjectName there themselves.
     *
     * However, existing code relies on the substitution, so we are
     * stuck with it.
     *
     * Here's how we handle it.  When you add a listener, we make a
     * ListenerWrapper around it.  We look that up in the
     * listenerWrappers map, and if there was already a wrapper for
     * that listener with the given ObjectName, we reuse it.  This map
     * is a WeakHashMap, so a listener that is no longer registered
     * with any MBean can be garbage collected.
     *
     * We cannot use simpler solutions such as always creating a new
     * wrapper or always registering the same listener with the MBean
     * and using the handback to find the client's original listener.
     * The reason is that we need to support the removeListener
     * variant that removes all (listener,filter,handback) triples on
     * a broadcaster that have a given listener.  And we do not have
     * any way to inspect a broadcaster's internal list of triples.
     * So the same client listener must always map to the same
     * listener registered with the broadcaster.
     *
     * Another possible solution would be to map from ObjectName to
     * list of listener wrappers (or IdentityHashMap of listener
     * wrappers), making this list the first time a listener is added
     * on a given MBean, and removing it when the MBean is removed.
     * This is probably more costly in memory, but could be useful if
     * some day we don't want to rely on weak references.
     */
public void addNotificationListener(ObjectName name, NotificationListener listener, NotificationFilter filter, Object handback) throws InstanceNotFoundException {
    // ------------------------------
    if (MBEANSERVER_LOGGER.isLoggable(Level.FINER)) {
        MBEANSERVER_LOGGER.logp(Level.FINER, DefaultMBeanServerInterceptor.class.getName(), "addNotificationListener", "ObjectName = " + name);
    }
    DynamicMBean instance = getMBean(name);
    checkMBeanPermission(instance, null, name, "addNotificationListener");
    NotificationBroadcaster broadcaster = getNotificationBroadcaster(name, instance, NotificationBroadcaster.class);
    // ------------------
    if (listener == null) {
        throw new RuntimeOperationsException(new IllegalArgumentException("Null listener"), "Null listener");
    }
    NotificationListener listenerWrapper = getListenerWrapper(listener, name, instance, true);
    broadcaster.addNotificationListener(listenerWrapper, filter, handback);
}

Example 4 with NotificationBroadcaster

use of javax.management.NotificationBroadcaster in project jdk8u_jdk by JetBrains.

the class MBeanIntrospector method findNotifications.

static MBeanNotificationInfo[] findNotifications(Object moi) {
    if (!(moi instanceof NotificationBroadcaster))
        return null;
    MBeanNotificationInfo[] mbn = ((NotificationBroadcaster) moi).getNotificationInfo();
    if (mbn == null)
        return null;
    MBeanNotificationInfo[] result = new MBeanNotificationInfo[mbn.length];
    for (int i = 0; i < mbn.length; i++) {
        MBeanNotificationInfo ni = mbn[i];
        if (ni.getClass() != MBeanNotificationInfo.class)
            ni = (MBeanNotificationInfo) ni.clone();
        result[i] = ni;
    }
    return result;
}