原文地址： http://www.theserverside.com/tt/articles/article.tss?l=CaseStudyMule
面向服務架構的關鍵字之一就是ESB。以前很多廠商靠買消息服務器來提供集成交互的方案，然后出現了SOAP和REST。
早期的嘗試基本上都是通過定一個固定的消息格式，例如xml來讓各個系統交換。但是這些消息格式本身經常需要修訂，就給集成帶來了很大的麻煩。
最好的解決方案就是每個應用還是用自己支持的接口，例如EDI或者SOAP，然后構建一個可以集成各種結構的聚合器，每一個應用的接口就開發成聚合器的一個端口。這樣一個cobol寫的應用就可以和一個j2me的應用交互，而不需要知道彼此的技術細節。
常見ESB供應商比較
|
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 |
這里少了一個ServiceMix。
下面是這個案例的細節：
本案例用到的程序包括：
假設有一個項目要集成很多企業級應用程序，出于開發周期的壓力，我們選擇集成而非重新構建的策略。也就是說order capture, inventory management, order management, fulfillment, and reporting 這些都購買現成的廠商的，我們只需要集中開發一個內容管理系統。
通過和其它六家廠商的協商，他們都提供了JMS和SOAP的接口。因此我們需要一個專業的JMS服務器。
下面我們來看看配置文件：
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 >
然后定義一些端點，每個端點都是一個外部供應商程序的接口
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" >
系統只有一個inbound，也就是進入系統消息的定義，端口名稱叫做outJMSBitco，也就是說outJMSBitco發出一個指令，進入總線，然后Mule把這個消息轉換后發送給其它所有的outbound-router，離開總線，進入別的應用程序。
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 >
這條路由的意思是，將消息通過JMS發送給Siebel，JMS的頭要標上OrderHistoryResonse，這樣Siebel的消息隊列受到一條這個消息，Siebel知道對方要做什么操作，將OrderHistory查詢出來。
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 >
這個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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