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    public 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    }