1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.pipeline;
19
20 import java.util.EventListener;
21 import java.util.EventObject;
22
23 /**
24 * Listener interface for {@link EventObject}s. Listeners are notified of
25 * events by the {@link StageContext} with which they are registered.
26 */
27 public interface StageEventListener extends EventListener {
28
29 /**
30 * Notify this listener of a {@link StageEvent}
31 * @param ev The event to be handled. Listeners should gracefully ignore any events that they
32 * do not know how to handle.
33 */
34 public abstract void notify(EventObject ev);
35 }