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    import java.util.Random;
021    
022    import org.apache.camel.Exchange;
023    import org.apache.camel.Processor;
024    
025    /**
026     * Implements the random load balancing policy
027     *
028     * @version 
029     */
030    public class RandomLoadBalancer extends QueueLoadBalancer {
031    
032        private static final Random RANDOM = new Random();
033    
034        protected synchronized Processor chooseProcessor(List<Processor> processors, Exchange exchange) {
035            int size = processors.size();
036            if (size == 0) {
037                return null;
038            } else if (size == 1) {
039                // there is only 1
040                return processors.get(0);
041            }
042    
043            // pick a random
044            int index = RANDOM.nextInt(size);
045            return processors.get(index);
046        }
047    
048        public String toString() {
049            return "RandomLoadBalancer";
050        }
051    }