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.listener; 019 020 import java.util.Collections; 021 import java.util.EventObject; 022 import java.util.HashMap; 023 import java.util.Map; 024 025 import org.apache.commons.pipeline.Stage; 026 import org.apache.commons.pipeline.StageEventListener; 027 import org.apache.commons.pipeline.event.ObjectProcessedEvent; 028 029 /** 030 * This listener keeps track of the number of {@link ObjectProcessedEvent}s 031 * received from each {@link Stage} 032 * 033 * 034 */ 035 public class ObjectProcessedEventCounter implements StageEventListener { 036 //private final Log log = LogFactory.getLog(ObjectProcessedEventCounter.class); 037 038 private Map<Stage,Integer> counts = Collections.synchronizedMap(new HashMap<Stage, Integer>()); 039 040 public synchronized void notify(EventObject evo) { 041 if (evo instanceof ObjectProcessedEvent) { 042 ObjectProcessedEvent ev = (ObjectProcessedEvent) evo; 043 if (!counts.containsKey(ev.getSource())) counts.put(ev.getSource(), 1); 044 } 045 } 046 047 public synchronized Map<Stage, Integer> getCounts() { 048 return this.counts; 049 } 050 }