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128 lines
4.6 KiB
128 lines
4.6 KiB
/*
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* Copyright (c) 1999, 2005, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.management;
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import java.util.concurrent.CopyOnWriteArrayList; // for Javadoc
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/**
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* <p>Interface implemented by an MBean that emits Notifications. It
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* allows a listener to be registered with the MBean as a notification
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* listener.</p>
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*
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* <h3>Notification dispatch</h3>
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*
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* <p>When an MBean emits a notification, it considers each listener that has been
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* added with {@link #addNotificationListener addNotificationListener} and not
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* subsequently removed with {@link #removeNotificationListener removeNotificationListener}.
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* If a filter was provided with that listener, and if the filter's
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* {@link NotificationFilter#isNotificationEnabled isNotificationEnabled} method returns
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* false, the listener is ignored. Otherwise, the listener's
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* {@link NotificationListener#handleNotification handleNotification} method is called with
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* the notification, as well as the handback object that was provided to
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* {@code addNotificationListener}.</p>
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*
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* <p>If the same listener is added more than once, it is considered as many times as it was
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* added. It is often useful to add the same listener with different filters or handback
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* objects.</p>
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*
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* <p>Implementations of this interface can differ regarding the thread in which the methods
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* of filters and listeners are called.</p>
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*
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* <p>If the method call of a filter or listener throws an {@link Exception}, then that
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* exception should not prevent other listeners from being invoked. However, if the method
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* call throws an {@link Error}, then it is recommended that processing of the notification
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* stop at that point, and if it is possible to propagate the {@code Error} to the sender of
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* the notification, this should be done.</p>
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*
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* <p>New code should use the {@link NotificationEmitter} interface
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* instead.</p>
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*
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* <p>Implementations of this interface and of {@code NotificationEmitter}
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* should be careful about synchronization. In particular, it is not a good
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* idea for an implementation to hold any locks while it is calling a
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* listener. To deal with the possibility that the list of listeners might
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* change while a notification is being dispatched, a good strategy is to
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* use a {@link CopyOnWriteArrayList} for this list.
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*
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* @since 1.5
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*/
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public interface NotificationBroadcaster {
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/**
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* Adds a listener to this MBean.
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*
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* @param listener The listener object which will handle the
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* notifications emitted by the broadcaster.
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* @param filter The filter object. If filter is null, no
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* filtering will be performed before handling notifications.
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* @param handback An opaque object to be sent back to the
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* listener when a notification is emitted. This object cannot be
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* used by the Notification broadcaster object. It should be
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* resent unchanged with the notification to the listener.
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*
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* @exception IllegalArgumentException Listener parameter is null.
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*
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* @see #removeNotificationListener
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*/
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public void addNotificationListener(NotificationListener listener,
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NotificationFilter filter,
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Object handback)
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throws java.lang.IllegalArgumentException;
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/**
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* Removes a listener from this MBean. If the listener
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* has been registered with different handback objects or
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* notification filters, all entries corresponding to the listener
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* will be removed.
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*
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* @param listener A listener that was previously added to this
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* MBean.
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*
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* @exception ListenerNotFoundException The listener is not
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* registered with the MBean.
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*
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* @see #addNotificationListener
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* @see NotificationEmitter#removeNotificationListener
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*/
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public void removeNotificationListener(NotificationListener listener)
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throws ListenerNotFoundException;
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/**
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* <p>Returns an array indicating, for each notification this
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* MBean may send, the name of the Java class of the notification
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* and the notification type.</p>
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*
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* <p>It is not illegal for the MBean to send notifications not
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* described in this array. However, some clients of the MBean
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* server may depend on the array being complete for their correct
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* functioning.</p>
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*
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* @return the array of possible notifications.
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*/
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public MBeanNotificationInfo[] getNotificationInfo();
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}
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