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-configuration id="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
<connector name="jmsConnector" className="org.mule.providers.jms.JmsConnector">
<properties>
<property name="jndiProviderUrl"
value="bitjmsnaming://172.28.63.209:7222"/>
<property name="connectionFactoryJndiName"
value="QueueConnectionFactory"/>
<map name="jndiProviderProperties">
<property name="java.naming.factory.initial"
value="com.bitco.bitjms.naming.bitjmsInitialContextFactory"/>
<property name="java.naming.security.principal" value="admin"/>
<property name="java.naming.security.credentials" value=""/>
</map>
<property name="username" value="admin"/>
<property name="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>
<endpoint name="inJMSGTA" address="jms://q.gta.in" connector="jmsConnector"/>
<endpoint name="inJMSSeebelle" address="jms://q.seebelle.in" connector="jmsConnector"/>
<endpoint name="inJMSYenta" address="jms://q.yenta.in" connector="jmsConnector"/>
<endpoint name="inJMSCatwire" address="jms://q.catwire.in" connector="jmsConnector"/>
<endpoint name="inJMSBitco" address="jms://q.bitco.in" connector="jmsConnector"/>
<endpoint name="outJMSGTA" address="jms://q.gta.out" connector="jmsConnector"/>
<endpoint name="outJMSSeebelle" address="jms://q.seebelle.out" connector="jmsConnector"/>
<endpoint name="outJMSYenta" address="jms://q.yenta.out" connector="jmsConnector"/>
<endpoint name="outJMSCatwire" address="jms://q.catwire.out" connector="jmsConnector"/>
<endpoint name="outJMSBitco" address="jms://q.bitco.out" connector="jmsConnector"/>
<endpoint name="console" address="stream://System.out" />
</global-endpoints>

<transformers>
<transformer name="JMSMessageToObject"
className="org.mule.providers.jms.transformers.JMSMessageToObject" />
<transformer name="ObjectToString"
className="org.mule.transformers.simple.ObjectToString" />
</transformers>

<model name="Enterprise-Applications-Mashup-JMS">
<mule-descriptor name="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-endpoint name="outJMSBitco"/>
</inbound-router>

<outbound-router match-all="true">
<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSYenta" />
<filter className="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。
<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSSiebel" />
<filter className="org.mule.samples.jms.JMSHeaderFilter"
expression="OrderHistoryResponse" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSCatwire"/>
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="item" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSCatwire"/>
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="item_mapping" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSYenta"/>
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="PAMInventoryUpdate" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSGTA" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="CustomerSearchRequest" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSSiebel" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="CustomerSearchResponse" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSYenta" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="OrderDetailsRequest" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSSiebel" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="OrderDetailsResponse" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSYenta" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="OrderAddUpdRequest" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSSiebel" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="OrderAddUpdResponse" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSYenta" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="catwireCreateItem" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSGTA" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="catalogupdate" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSGTA" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="productupdate" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSGTA" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="skuupdate" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSYenta" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="gtaCreateOrder" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSYenta" />
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="gtaGetOrderDetails" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="openJmsOutbound"/>
<filter className="org.mule.samples.jms.JMSHeaderFilter" expression="XXXOrderUpdate" />
</router>

<router className="org.mule.routing.outbound.FilteringOutboundRouter">
<global-endpoint name="inJMSBitco"/>
<filter className="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
<router className="org.mule.routing.outbound.OutboundPassThroughRouter">
<endpoint address="stream://System.out" transformers="ObjectToString" />
</router>
</outbound-router>
</mule-descriptor>
</model>
</mule-configuration>

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