一个基于Mule的企业服务总线的案例
原文地址： http://www.theserverside.com/tt/articles/article.tss?l=CaseStudyMule
面向服务架构的关键字之一就是ESB。以前很多厂商靠买消息服务器来提供集成交互的方案，然后出现了SOAP和REST。
早期的尝试基本上都是通过定一个固定的消息格式，例如xml来让各个系统交换。但是这些消息格式本身经常需要修订，就给集成带来了很大的麻烦。
最好的解决方案就是每个应用还是用自己支持的接口，例如EDI或者SOAP，然后构建一个可以集成各种结构的聚合器，每一个应用的接口就开发成聚合器的一个端口。这样一个cobol写的应用就可以和一个j2me的应用交互，而不需要知道彼此的技术细节。
常见ESB供应商比较
|
Product |
Vendor |
Connects with... |
|
Matrix BusinessWorks |
TIBCO |
SOAP, EMS, JMS, Rendezvous, MQ, BPEL |
|
Mule ESB |
Open-source, MuleSource, Inc. |
SOAP, REST, JMS, MQ, JBI, AQ, Caching, JavaSpaces, GigaSpaces, Email, IM, JCA, AS400 Data Queues, System I/O. |
|
OpenESB |
Open-source, Sun Microsystems |
JBI, JCA, JAX-RPC, JAX-WS |
|
Sonic ESB |
Progress Software |
JMS, SOAP, JMX |
|
Websphere ESB |
IBM |
JMS, MQ, SOAP; requires additional adapters to interface with other products and legacy protocols; requires Websphere to work |
这里少了一个ServiceMix。
下面是这个案例的细节：
本案例用到的程序包括：
AMD-based 2.6 GHz 4 GB RAM, and Intel-based 3 GHz 4 GB RAM servers Solaris 10 and Ubuntu Linux Dapper Drake Java Run-time Environment 1.5.9 Mule current general availability package A commercial JMS provider Commercial applications for order capture, inventory management, order management, fulfillment, and reporting假设有一个项目要集成很多企业级应用程序，出于开发周期的压力，我们选择集成而非重新构建的策略。也就是说order capture, inventory management, order management, fulfillment, and reporting 这些都购买现成的厂商的，我们只需要集中开发一个内容管理系统。
通过和其它六家厂商的协商，他们都提供了JMS和SOAP的接口。因此我们需要一个专业的JMS服务器。
下面我们来看看配置文件：
<mule-configurationid="Enterprise-Applications-Mashup"version="1.0">
首先定义一个Mule和JMS交互的连接器，相当于一个连接池
<connectorname="jmsConnector"className="org.mule.providers.jms.JmsConnector">
<properties>
<propertyname="jndiProviderUrl"
value="bitjmsnaming://172.28.63.209:7222"/>
<propertyname="connectionFactoryJndiName"
value="QueueConnectionFactory"/>
<mapname="jndiProviderProperties">
<propertyname="java.naming.factory.initial"
value="com.bitco.bitjms.naming.bitjmsInitialContextFactory"/>
<propertyname="java.naming.security.principal"value="admin"/>
<propertyname="java.naming.security.credentials"value=""/>
</map>
<propertyname="username"value="admin"/>
<propertyname="password"value=""/>
</properties>
</connector>
然后定义一些端点，每个端点都是一个外部供应商程序的接口
<global-endpoints>
<endpointname="inJMSGTA"address="jms://q.gta.in"connector="jmsConnector"/>
<endpointname="inJMSSeebelle"address="jms://q.seebelle.in"connector="jmsConnector"/>
<endpointname="inJMSYenta"address="jms://q.yenta.in"connector="jmsConnector"/>
<endpointname="inJMSCatwire"address="jms://q.catwire.in"connector="jmsConnector"/>
<endpointname="inJMSBitco"address="jms://q.bitco.in"connector="jmsConnector"/>
<endpointname="outJMSGTA"address="jms://q.gta.out"connector="jmsConnector"/>
<endpointname="outJMSSeebelle"address="jms://q.seebelle.out"connector="jmsConnector"/>
<endpointname="outJMSYenta"address="jms://q.yenta.out"connector="jmsConnector"/>
<endpointname="outJMSCatwire"address="jms://q.catwire.out"connector="jmsConnector"/>
<endpointname="outJMSBitco"address="jms://q.bitco.out"connector="jmsConnector"/>
<endpointname="console"address="stream://System.out"/>
</global-endpoints>
<transformers>
<transformername="JMSMessageToObject"
className="org.mule.providers.jms.transformers.JMSMessageToObject"/>
<transformername="ObjectToString"
className="org.mule.transformers.simple.ObjectToString"/>
</transformers>
<modelname="Enterprise-Applications-Mashup-JMS">
<mule-descriptorname="JMSMessageSwitchboard"
implementation="org.mule.components.simple.PassThroughComponent">
系统只有一个inbound，也就是进入系统消息的定义，端口名称叫做outJMSBitco，也就是说outJMSBitco发出一个指令，进入总线，然后Mule把这个消息转换后发送给其它所有的outbound-router，离开总线，进入别的应用程序。
<inbound-router>
<global-endpointname="outJMSBitco"/>
</inbound-router>
<outbound-routermatch-all="true">
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"
expression="OrderHistoryRequest"/>
</router>
<connectorname="jmsConnector"className="org.mule.providers.jms.JmsConnector">
<properties>
<propertyname="jndiProviderUrl"
value="bitjmsnaming://172.28.63.209:7222"/>
<propertyname="connectionFactoryJndiName"
value="QueueConnectionFactory"/>
<mapname="jndiProviderProperties">
<propertyname="java.naming.factory.initial"
value="com.bitco.bitjms.naming.bitjmsInitialContextFactory"/>
<propertyname="java.naming.security.principal"value="admin"/>
<propertyname="java.naming.security.credentials"value=""/>
</map>
<propertyname="username"value="admin"/>
<propertyname="password"value=""/>
</properties>
</connector>
然后定义一些端点，每个端点都是一个外部供应商程序的接口
<global-endpoints>
<endpointname="inJMSGTA"address="jms://q.gta.in"connector="jmsConnector"/>
<endpointname="inJMSSeebelle"address="jms://q.seebelle.in"connector="jmsConnector"/>
<endpointname="inJMSYenta"address="jms://q.yenta.in"connector="jmsConnector"/>
<endpointname="inJMSCatwire"address="jms://q.catwire.in"connector="jmsConnector"/>
<endpointname="inJMSBitco"address="jms://q.bitco.in"connector="jmsConnector"/>
<endpointname="outJMSGTA"address="jms://q.gta.out"connector="jmsConnector"/>
<endpointname="outJMSSeebelle"address="jms://q.seebelle.out"connector="jmsConnector"/>
<endpointname="outJMSYenta"address="jms://q.yenta.out"connector="jmsConnector"/>
<endpointname="outJMSCatwire"address="jms://q.catwire.out"connector="jmsConnector"/>
<endpointname="outJMSBitco"address="jms://q.bitco.out"connector="jmsConnector"/>
<endpointname="console"address="stream://System.out"/>
</global-endpoints>
<transformers>
<transformername="JMSMessageToObject"
className="org.mule.providers.jms.transformers.JMSMessageToObject"/>
<transformername="ObjectToString"
className="org.mule.transformers.simple.ObjectToString"/>
</transformers>
<modelname="Enterprise-Applications-Mashup-JMS">
<mule-descriptorname="JMSMessageSwitchboard"
implementation="org.mule.components.simple.PassThroughComponent">
系统只有一个inbound，也就是进入系统消息的定义，端口名称叫做outJMSBitco，也就是说outJMSBitco发出一个指令，进入总线，然后Mule把这个消息转换后发送给其它所有的outbound-router，离开总线，进入别的应用程序。
<inbound-router>
<global-endpointname="outJMSBitco"/>
</inbound-router>
<outbound-routermatch-all="true">
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"
expression="OrderHistoryRequest"/>
</router>
以下面这条为例：
这条路由的意思是，将消息通过JMS发送给Siebel，JMS的头要标上OrderHistoryResonse，这样Siebel的消息队列受到一条这个消息，Siebel知道对方要做什么操作，将OrderHistory查询出来。
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSSiebel"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"
expression="OrderHistoryResponse"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSCatwire"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="item"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSCatwire"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="item_mapping"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="PAMInventoryUpdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSGTA"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="CustomerSearchRequest"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSSiebel"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="CustomerSearchResponse"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderDetailsRequest"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSSiebel"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderDetailsResponse"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderAddUpdRequest"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSSiebel"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderAddUpdResponse"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="catwireCreateItem"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSGTA"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="catalogupdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSGTA"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="productupdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSGTA"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="skuupdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="gtaCreateOrder"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="gtaGetOrderDetails"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="openJmsOutbound"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="XXXOrderUpdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSBitco"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderRelease"/>
</router>
这个端口的意思是把消息打印在DOS窗口上
<routerclassName="org.mule.routing.outbound.OutboundPassThroughRouter">
<endpointaddress="stream://System.out"transformers="ObjectToString"/>
</router>
</outbound-router>
</mule-descriptor>
</model>
</mule-configuration>
这条路由的意思是，将消息通过JMS发送给Siebel，JMS的头要标上OrderHistoryResonse，这样Siebel的消息队列受到一条这个消息，Siebel知道对方要做什么操作，将OrderHistory查询出来。
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSSiebel"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"
expression="OrderHistoryResponse"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSCatwire"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="item"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSCatwire"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="item_mapping"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="PAMInventoryUpdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSGTA"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="CustomerSearchRequest"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSSiebel"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="CustomerSearchResponse"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderDetailsRequest"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSSiebel"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderDetailsResponse"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderAddUpdRequest"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSSiebel"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderAddUpdResponse"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="catwireCreateItem"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSGTA"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="catalogupdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSGTA"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="productupdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSGTA"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="skuupdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="gtaCreateOrder"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSYenta"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="gtaGetOrderDetails"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="openJmsOutbound"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="XXXOrderUpdate"/>
</router>
<routerclassName="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpointname="inJMSBitco"/>
<filterclassName="org.mule.samples.jms.JMSHeaderFilter"expression="OrderRelease"/>
</router>
这个端口的意思是把消息打印在DOS窗口上
<routerclassName="org.mule.routing.outbound.OutboundPassThroughRouter">
<endpointaddress="stream://System.out"transformers="ObjectToString"/>
</router>
</outbound-router>
</mule-descriptor>
</model>
</mule-configuration>