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;
020import java.util.Random;
021
022import org.apache.camel.Exchange;
023import org.apache.camel.Processor;
024
025/**
026 * Implements the random load balancing policy
027 *
028 * @version 
029 */
030public 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}