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
024public class WeightedRoundRobinLoadBalancer extends WeightedLoadBalancer {
025    private int counter;
026    
027    public WeightedRoundRobinLoadBalancer(List<Integer> distributionRatios) {
028        super(distributionRatios);
029    }
030    
031    @Override
032    protected synchronized Processor chooseProcessor(List<Processor> processors, Exchange exchange) {
033        if (isRuntimeRatiosZeroed())  {
034            resetRuntimeRatios();
035            counter = 0;
036        }
037        
038        boolean found = false;
039        while (!found) {
040            if (counter >= getRuntimeRatios().size()) {
041                counter = 0;
042            }
043            
044            if (getRuntimeRatios().get(counter).getRuntimeWeight() > 0) {
045                getRuntimeRatios().get(counter).setRuntimeWeight((getRuntimeRatios().get(counter).getRuntimeWeight()) - 1);
046                found = true;
047            } else {
048                counter++;
049            }
050        }
051       
052        return processors.get(counter++);
053    }
054    
055}