NotificationBroadcasterSupport (Java 2 Platform SE 5.0) - JDK 5 Documentation v1.5.0, Java 2 SDK 英文文档
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JavaTM 2 Platform Standard Ed. 5.0 |
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javax.management
Class NotificationBroadcasterSupport
java.lang.Objectjavax.management.NotificationBroadcasterSupport
- All Implemented Interfaces:
- NotificationBroadcaster, NotificationEmitter
- Direct Known Subclasses:
- JMXConnectorServer, Monitor, RelationService, Timer
public class NotificationBroadcasterSupport
- extends Object
- implements NotificationEmitter
- extends Object
Provides an implementation of NotificationEmitter
interface. This can be used as the super class of an MBean that
sends notifications.
It is not specified whether the notification dispatch model is
synchronous or asynchronous. That is, when a thread calls sendNotification, the NotificationListener.handleNotification method of each listener
may be called within that thread (a synchronous model) or within
some other thread (an asynchronous model).
Applications should not depend on notification dispatch being synchronous or being asynchronous. Thus:
- Applications should not assume a synchronous model. When the
sendNotificationmethod returns, it is not guaranteed that every listener'shandleNotificationmethod has been called. It is not guaranteed either that a listener will see notifications in the same order as they were generated. Listeners that depend on order should use the sequence number of notifications to determine their order (seeNotification.getSequenceNumber()). - Applications should not assume an asynchronous model. If the
actions performed by a listener are potentially slow, the listener
should arrange for them to be performed in another thread, to avoid
holding up other listeners and the caller of
sendNotification.
- Since:
- 1.5
| Constructor Summary | |
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NotificationBroadcasterSupport()
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| Method Summary | |
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void |
addNotificationListener(NotificationListener listener,
NotificationFilter filter,
Object handback)
Adds a listener. |
MBeanNotificationInfo[] |
getNotificationInfo()
Returns an array indicating, for each notification this MBean may send, the name of the Java class of the notification and the notification type. |
protected void |
handleNotification(NotificationListener listener,
Notification notif,
Object handback)
This method is called by sendNotification for each listener in order to send the
notification to that listener. |
void |
removeNotificationListener(NotificationListener listener)
Removes a listener from this MBean. |
void |
removeNotificationListener(NotificationListener listener,
NotificationFilter filter,
Object handback)
Removes a listener from this MBean. |
void |
sendNotification(Notification notification)
Sends a notification. |
| Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
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NotificationBroadcasterSupport
public NotificationBroadcasterSupport()
| Method Detail |
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addNotificationListener
public void addNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback)
- Adds a listener.
- Specified by:
addNotificationListenerin interfaceNotificationBroadcaster
- Parameters:
listener- The listener to receive notifications.filter- The filter object. If filter is null, no filtering will be performed before handling notifications.handback- An opaque object to be sent back to the listener when a notification is emitted. This object cannot be used by the Notification broadcaster object. It should be resent unchanged with the notification to the listener.- Throws:
IllegalArgumentException- thrown if the listener is null.- See Also:
removeNotificationListener(javax.management.NotificationListener)
removeNotificationListener
public void removeNotificationListener(NotificationListener listener) throws ListenerNotFoundException
- Description copied from interface:
NotificationBroadcaster - Removes a listener from this MBean. If the listener
has been registered with different handback objects or
notification filters, all entries corresponding to the listener
will be removed.
- Specified by:
removeNotificationListenerin interfaceNotificationBroadcaster
- Parameters:
listener- A listener that was previously added to this MBean.- Throws:
ListenerNotFoundException- The listener is not registered with the MBean.- See Also:
NotificationBroadcaster.addNotificationListener(javax.management.NotificationListener, javax.management.NotificationFilter, java.lang.Object),NotificationEmitter.removeNotificationListener(javax.management.NotificationListener, javax.management.NotificationFilter, java.lang.Object)
removeNotificationListener
public void removeNotificationListener(NotificationListener listener, NotificationFilter filter, Object handback) throws ListenerNotFoundException
- Description copied from interface:
NotificationEmitter Removes a listener from this MBean. The MBean must have a listener that exactly matches the given
listener,filter, andhandbackparameters. If there is more than one such listener, only one is removed.The
filterandhandbackparameters may be null if and only if they are null in a listener to be removed.- Specified by:
removeNotificationListenerin interfaceNotificationEmitter
- Parameters:
listener- A listener that was previously added to this MBean.filter- The filter that was specified when the listener was added.handback- The handback that was specified when the listener was added.- Throws:
ListenerNotFoundException- The listener is not registered with the MBean, or it is not registered with the given filter and handback.
getNotificationInfo
public MBeanNotificationInfo[] getNotificationInfo()
- Description copied from interface:
NotificationBroadcaster Returns an array indicating, for each notification this MBean may send, the name of the Java class of the notification and the notification type.
It is not illegal for the MBean to send notifications not described in this array. However, some clients of the MBean server may depend on the array being complete for their correct functioning.
- Specified by:
getNotificationInfoin interfaceNotificationBroadcaster
- Returns:
- the array of possible notifications.
sendNotification
public void sendNotification(Notification notification)
- Sends a notification.
- Parameters:
notification- The notification to send.
handleNotification
protected void handleNotification(NotificationListener listener, Notification notif, Object handback)
This method is called by
sendNotificationfor each listener in order to send the notification to that listener. It can be overridden in subclasses to change the behavior of notification delivery, for instance to deliver the notification in a separate thread.It is not guaranteed that this method is called by the same thread as the one that called
sendNotification.The default implementation of this method is equivalent to
listener.handleNotification(notif, handback);
- Parameters:
listener- the listener to which the notification is being delivered.notif- the notification being delivered to the listener.handback- the handback object that was supplied when the listener was added.
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JavaTM 2 Platform Standard Ed. 5.0 |
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright 2004 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.