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    }