/*

 * Copyright (c) 1999, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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package javax.naming.event;

/**

  * This interface is the root of listener interfaces that

  * handle <tt>NamingEvent</tt>s.

  * It does not make sense for a listener to implement just this interface.

  * A listener typically implements a subinterface of <tt>NamingListener</tt>,

  * such as <tt>ObjectChangeListener</tt> or <tt>NamespaceChangeListener</tt>.

  *<p>

  * This interface contains a single method, <tt>namingExceptionThrown()</tt>,

  * that must be implemented so that the listener can be notified of

  * exceptions that are thrown (by the service provider) while gathering

  * information about the events that they're interested in.

  * When this method is invoked, the listener has been automatically deregistered

  * from the <tt>EventContext</tt> with which it has registered.

  *<p>

  * For example, suppose a listener implements <tt>ObjectChangeListener</tt> and

  * registers with a <tt>EventContext</tt>.

  * Then, if the connection to the server is subsequently broken,

  * the listener will receive a <tt>NamingExceptionEvent</tt> and may

  * take some corrective action, such as notifying the user of the application.

  *

  * @author Rosanna Lee

  * @author Scott Seligman

  *

  * @see NamingEvent

  * @see NamingExceptionEvent

  * @see EventContext

  * @see EventDirContext

  * @since 1.3

  */

public interface NamingListener extends java.util.EventListener {

    /**

     * Called when a naming exception is thrown while attempting

     * to fire a <tt>NamingEvent</tt>.

     *

     * @param evt The nonnull event.

     */

    void namingExceptionThrown(NamingExceptionEvent evt);

}