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 private transient int index; 034 035 protected synchronized Processor chooseProcessor(List<Processor> processors, Exchange exchange) { 036 int size = processors.size(); 037 if (size == 0) { 038 return null; 039 } else if (size == 1) { 040 // there is only 1 041 return processors.get(0); 042 } 043 044 // pick a random 045 index = RANDOM.nextInt(size); 046 return processors.get(index); 047 } 048 049 public int getLastChosenProcessorIndex() { 050 return index; 051 } 052 053 public String toString() { 054 return "RandomLoadBalancer"; 055 } 056}