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