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    package org.apache.camel.processor.loadbalancer;
018    
019    import java.util.List;
020    
021    import org.apache.camel.Exchange;
022    import org.apache.camel.Processor;
023    
024    /**
025     * Implements the round robin load balancing policy
026     *
027     * @version 
028     */
029    public 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 String toString() {
041            return "RoundRobinLoadBalancer";
042        }
043    
044    }