001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018 package org.apache.commons.pipeline; 019 020 import java.util.EventListener; 021 import java.util.EventObject; 022 023 /** 024 * Listener interface for {@link EventObject}s. Listeners are notified of 025 * events by the {@link StageContext} with which they are registered. 026 */ 027 public interface StageEventListener extends EventListener { 028 029 /** 030 * Notify this listener of a {@link StageEvent} 031 * @param ev The event to be handled. Listeners should gracefully ignore any events that they 032 * do not know how to handle. 033 */ 034 public abstract void notify(EventObject ev); 035 }