/*

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You under the Apache License, Version 2.0

  * (the "License"); you may not use this file except in compliance with

  * the License.  You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.apache.commons.pipeline.listener;

 import java.util.Collections;

 import java.util.EventObject;

 import java.util.HashMap;

 import java.util.Map;

 import org.apache.commons.pipeline.Stage;

 import org.apache.commons.pipeline.StageEventListener;

 import org.apache.commons.pipeline.event.ObjectProcessedEvent;

 /**

  * This listener keeps track of the number of {@link ObjectProcessedEvent}s

  * received from each {@link Stage}

  *

  *

  */

 public class ObjectProcessedEventCounter implements StageEventListener {

     //private final Log log = LogFactory.getLog(ObjectProcessedEventCounter.class);

     private Map<Stage,Integer> counts = Collections.synchronizedMap(new HashMap<Stage, Integer>());

     public synchronized void notify(EventObject evo) {

         if (evo instanceof ObjectProcessedEvent) {

         ObjectProcessedEvent ev = (ObjectProcessedEvent) evo;

         if (!counts.containsKey(ev.getSource())) counts.put(ev.getSource(), 1);

     }

     }

     public synchronized Map<Stage, Integer> getCounts() {

         return this.counts;

     }

 }