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.processor.loadbalancer;
018
019import java.util.List;
020
021import org.apache.camel.Exchange;
022import org.apache.camel.Processor;
023
024/**
025 * Implements the round robin load balancing policy
026 *
027 * @version 
028 */
029public class RoundRobinLoadBalancer extends QueueLoadBalancer {
030    private int counter = -1;
031
032    protected synchronized Processor chooseProcessor(List<Processor> processors, Exchange exchange) {
033        int size = processors.size();
034        if (++counter >= size) {
035            counter = 0;
036        }
037        return processors.get(counter);
038    }
039
040    public int getLastChosenProcessorIndex() {
041        return counter;
042    }
043
044    public String toString() {
045        return "RoundRobinLoadBalancer";
046    }
047
048}