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.loadbalancer; 018 019 020 021 import java.util.List; 022 023 import javax.xml.bind.annotation.XmlAccessType; 024 import javax.xml.bind.annotation.XmlAccessorType; 025 import javax.xml.bind.annotation.XmlTransient; 026 import javax.xml.bind.annotation.XmlType; 027 028 import org.apache.camel.Exchange; 029 import org.apache.camel.Processor; 030 import org.apache.camel.impl.RouteContext; 031 import org.apache.camel.model.IdentifiedType; 032 import org.apache.camel.processor.loadbalancer.LoadBalancer; 033 import org.apache.camel.util.IntrospectionSupport; 034 import org.apache.camel.util.ObjectHelper; 035 import static org.apache.camel.util.ObjectHelper.notNull; 036 037 @XmlType(name = "loadBalancerType") 038 @XmlAccessorType(XmlAccessType.FIELD) 039 public class LoadBalancerType extends IdentifiedType implements LoadBalancer { 040 041 @XmlTransient 042 private LoadBalancer loadBalancer; 043 @XmlTransient 044 private String loadBalancerTypeName; 045 046 public LoadBalancerType() { 047 } 048 049 public LoadBalancerType(LoadBalancer loadBalancer) { 050 this.loadBalancer = loadBalancer; 051 } 052 053 protected LoadBalancerType(String loadBalancerTypeName) { 054 this.loadBalancerTypeName = loadBalancerTypeName; 055 } 056 057 public static LoadBalancer getLoadBalancer(RouteContext routeContext, LoadBalancerType type, String ref) { 058 if (type == null) { 059 notNull(ref, "ref or LoadBalancerType"); 060 LoadBalancer loadBalancer = routeContext.lookup(ref, LoadBalancer.class); 061 if (loadBalancer instanceof LoadBalancerType) { 062 type = (LoadBalancerType) loadBalancer; 063 } else { 064 return loadBalancer; 065 } 066 } 067 return type.getLoadBalancer(routeContext); 068 } 069 070 071 /** 072 * Sets a named property on the data format instance using introspection 073 */ 074 protected void setProperty(Object bean, String name, Object value) { 075 try { 076 IntrospectionSupport.setProperty(bean, name, value); 077 } catch (Exception e) { 078 throw new IllegalArgumentException("Failed to set property " + name + " on " + bean 079 + ". Reason: " + e, e); 080 } 081 } 082 083 /** 084 * Allows derived classes to customize the load balancer 085 */ 086 protected void configureLoadBalancer(LoadBalancer loadBalancer) { 087 } 088 089 public LoadBalancer getLoadBalancer(RouteContext routeContext) { 090 if (loadBalancer == null) { 091 loadBalancer = createLoadBalancer(routeContext); 092 ObjectHelper.notNull(loadBalancer, "loadBalancer"); 093 configureLoadBalancer(loadBalancer); 094 } 095 return loadBalancer; 096 } 097 098 /** 099 * Factory method to create the load balancer instance 100 */ 101 protected LoadBalancer createLoadBalancer(RouteContext routeContext) { 102 if (loadBalancerTypeName != null) { 103 Class type = ObjectHelper.loadClass(loadBalancerTypeName, getClass().getClassLoader()); 104 if (type == null) { 105 throw new IllegalArgumentException("The class " + loadBalancerTypeName + " is not on the classpath! Cannot use the loadBalancer " + this); 106 } 107 return (LoadBalancer) ObjectHelper.newInstance(type); 108 } 109 return null; 110 } 111 112 113 public void addProcessor(Processor processor) { 114 ObjectHelper.notNull(loadBalancer, "loadBalancer"); 115 loadBalancer.addProcessor(processor); 116 } 117 118 public List<Processor> getProcessors() { 119 ObjectHelper.notNull(loadBalancer, "loadBalancer"); 120 return loadBalancer.getProcessors(); 121 } 122 123 public void removeProcessor(Processor processor) { 124 ObjectHelper.notNull(loadBalancer, "loadBalancer"); 125 loadBalancer.removeProcessor(processor); 126 } 127 128 public void process(Exchange exchange) throws Exception { 129 ObjectHelper.notNull(loadBalancer, "loadBalancer"); 130 loadBalancer.process(exchange); 131 } 132 133 }