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 */
017package org.apache.camel.impl;
018
019import java.util.HashMap;
020import java.util.Map;
021import java.util.concurrent.atomic.AtomicInteger;
022
023import org.apache.camel.NamedNode;
024import org.apache.camel.spi.NodeIdFactory;
025
026/**
027 * Default id factory.
028 *
029 * @version 
030 */
031public class DefaultNodeIdFactory implements NodeIdFactory {
032
033    protected static Map<String, AtomicInteger> nodeCounters = new HashMap<String, AtomicInteger>();
034
035    public String createId(NamedNode definition) {
036        String key = definition.getShortName();
037        return key + getNodeCounter(key).incrementAndGet();
038    }
039
040    /**
041     * Returns the counter for the given node key, lazily creating one if necessary
042     */
043    protected static synchronized AtomicInteger getNodeCounter(String key) {
044        AtomicInteger answer = nodeCounters.get(key);
045        if (answer == null) {
046            answer = new AtomicInteger(0);
047            nodeCounters.put(key, answer);
048        }
049        return answer;
050    }
051
052
053    /**
054     * Helper method for test purposes that allows tests to start clean (made protected 
055     *  to ensure that it is not called accidentally)
056     */
057    protected static synchronized void resetAllCounters() {
058        for (AtomicInteger counter : nodeCounters.values()) {
059            counter.set(0);
060        }
061    }
062}