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.model;
018
019 import java.util.Collection;
020 import java.util.List;
021
022 import javax.xml.bind.annotation.XmlAccessType;
023 import javax.xml.bind.annotation.XmlAccessorType;
024 import javax.xml.bind.annotation.XmlAttribute;
025 import javax.xml.bind.annotation.XmlElement;
026 import javax.xml.bind.annotation.XmlElements;
027 import javax.xml.bind.annotation.XmlRootElement;
028
029 import org.apache.camel.Exchange;
030 import org.apache.camel.Expression;
031 import org.apache.camel.Processor;
032 import org.apache.camel.impl.RouteContext;
033 import org.apache.camel.model.loadbalancer.LoadBalancerType;
034 import org.apache.camel.model.loadbalancer.RandomLoadBalanceStrategy;
035 import org.apache.camel.model.loadbalancer.RoundRobinLoadBalanceStrategy;
036 import org.apache.camel.model.loadbalancer.StickyLoadBalanceStrategy;
037 import org.apache.camel.model.loadbalancer.TopicLoadBalanceStrategy;
038 import org.apache.camel.processor.SendProcessor;
039 import org.apache.camel.processor.loadbalancer.LoadBalancer;
040 import org.apache.camel.processor.loadbalancer.RandomLoadBalancer;
041 import org.apache.camel.processor.loadbalancer.RoundRobinLoadBalancer;
042 import org.apache.camel.processor.loadbalancer.StickyLoadBalancer;
043 import org.apache.camel.processor.loadbalancer.TopicLoadBalancer;
044 import org.apache.camel.util.CollectionStringBuffer;
045
046 @XmlRootElement(name = "loadBalance")
047 @XmlAccessorType(XmlAccessType.FIELD)
048 public class LoadBalanceType extends OutputType<LoadBalanceType> {
049 @XmlAttribute(required = false)
050 private String ref;
051
052 @XmlElements({
053 @XmlElement(required = false, name = "roundRobin", type = RoundRobinLoadBalanceStrategy.class),
054 @XmlElement(required = false, name = "random", type = RandomLoadBalanceStrategy.class),
055 @XmlElement(required = false, name = "sticky", type = StickyLoadBalanceStrategy.class),
056 @XmlElement(required = false, name = "topic", type = TopicLoadBalanceStrategy.class)}
057 )
058 private LoadBalancerType loadBalancerType;
059
060
061
062 public LoadBalanceType() {
063
064 }
065
066 public String getRef() {
067 return ref;
068 }
069
070 public void setRef(String ref) {
071 this.ref = ref;
072 }
073
074 public LoadBalancerType getLoadBalancerType() {
075 return loadBalancerType;
076 }
077
078 public void setLoadBalancerType(LoadBalancerType loadbalancer) {
079 loadBalancerType = loadbalancer;
080 }
081
082 protected Processor createOutputsProcessor(RouteContext routeContext, Collection<ProcessorType<?>> outputs)
083 throws Exception {
084
085 LoadBalancer loadBalancer = LoadBalancerType.getLoadBalancer(routeContext, loadBalancerType, ref);
086
087 for (ProcessorType processorType : outputs) {
088 //The outputs should be the SendProcessor
089 SendProcessor processor = (SendProcessor) processorType.createProcessor(routeContext);
090
091 loadBalancer.addProcessor(processor);
092 }
093 return loadBalancer;
094 }
095
096 // when this method will be called
097 @Override
098 public Processor createProcessor(RouteContext routeContext) throws Exception {
099
100 LoadBalancer loadBalancer = LoadBalancerType.getLoadBalancer(routeContext, loadBalancerType, ref);
101 for (ProcessorType processorType : getOutputs()) {
102 //The outputs should be the SendProcessor
103 SendProcessor processor = (SendProcessor) processorType.createProcessor(routeContext);
104
105 loadBalancer.addProcessor(processor);
106 }
107
108 return loadBalancer;
109 }
110
111 // Fluent API
112 // -------------------------------------------------------------------------
113 public LoadBalanceType setLoadBalancer(LoadBalancer loadBalancer) {
114 loadBalancerType = new LoadBalancerType(loadBalancer);
115 return this;
116 }
117
118 public LoadBalanceType roundRobin() {
119 loadBalancerType = new LoadBalancerType(new RoundRobinLoadBalancer());
120 return this;
121 }
122
123 public LoadBalanceType random() {
124 loadBalancerType = new LoadBalancerType(new RandomLoadBalancer());
125 return this;
126 }
127
128 public LoadBalanceType sticky(Expression<Exchange> correlationExpression) {
129 loadBalancerType = new LoadBalancerType(new StickyLoadBalancer(correlationExpression));
130 return this;
131 }
132
133 public LoadBalanceType topic() {
134 loadBalancerType = new LoadBalancerType(new TopicLoadBalancer());
135 return this;
136 }
137
138
139 @Override
140 public String getLabel() {
141 CollectionStringBuffer buffer = new CollectionStringBuffer();
142 List<ProcessorType<?>> list = getOutputs();
143 for (ProcessorType<?> processorType : list) {
144 buffer.append(processorType.getLabel());
145 }
146 return buffer.toString();
147 }
148
149 @Override
150 public String toString() {
151 String result;
152 if (loadBalancerType != null) {
153 result = "LoadBalanceType[" + loadBalancerType + ", ";
154 } else {
155 result = "LoadBalanceType[" + ref + ", ";
156 }
157 result = result + getOutputs() + "]";
158 return result;
159 }
160
161
162
163
164
165
166 }