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.ArrayList;
020import java.util.List;
021
022public abstract class WeightedLoadBalancer extends QueueLoadBalancer {
023    transient int lastIndex;
024
025    private List<Integer> distributionRatioList = new ArrayList<>();
026    private List<DistributionRatio> runtimeRatios = new ArrayList<>();
027
028    
029    public WeightedLoadBalancer(List<Integer> distributionRatios) {
030        deepCloneDistributionRatios(distributionRatios);
031        loadRuntimeRatios(distributionRatios);
032    }
033    
034    protected void deepCloneDistributionRatios(List<Integer> distributionRatios) {
035        for (Integer value : distributionRatios) {
036            this.distributionRatioList.add(value);
037        }
038    }
039
040    public int getLastChosenProcessorIndex() {
041        return lastIndex;
042    }
043
044    @Override
045    protected void doStart() throws Exception {
046        super.doStart();
047        if (getProcessors().size() != getDistributionRatioList().size()) {
048            throw new IllegalArgumentException("Loadbalacing with " + getProcessors().size()
049                + " should match number of distributions " + getDistributionRatioList().size());
050        }
051    }
052
053    protected void loadRuntimeRatios(List<Integer> distributionRatios) {
054        int position = 0;
055        
056        for (Integer value : distributionRatios) {
057            runtimeRatios.add(new DistributionRatio(position++, value.intValue()));
058        }
059    }
060    
061    protected boolean isRuntimeRatiosZeroed() {
062        boolean cleared = true;
063        
064        for (DistributionRatio runtimeRatio : runtimeRatios) {
065            if (runtimeRatio.getRuntimeWeight() > 0) {
066                cleared = false;
067            }
068        }        
069        return cleared; 
070    }
071    
072    protected void resetRuntimeRatios() {
073        for (DistributionRatio runtimeRatio : runtimeRatios) {
074            runtimeRatio.setRuntimeWeight(runtimeRatio.getDistributionWeight());
075        }
076    }
077
078    public List<Integer> getDistributionRatioList() {
079        return distributionRatioList;
080    }
081
082    public void setDistributionRatioList(List<Integer> distributionRatioList) {
083        this.distributionRatioList = distributionRatioList;
084    }
085
086    public List<DistributionRatio> getRuntimeRatios() {
087        return runtimeRatios;
088    }
089
090    public void setRuntimeRatios(ArrayList<DistributionRatio> runtimeRatios) {
091        this.runtimeRatios = runtimeRatios;
092    }    
093    
094}