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]]>SCA Assembly Model - Modulehttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/43043.htmlAllen YoungAllen YoungTue, 25 Apr 2006 07:58:00 GMThttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/43043.htmlhttp://www.aygfsteel.com/AllenYoung/comments/43043.htmlhttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/43043.html#Feedback0http://www.aygfsteel.com/AllenYoung/comments/commentRss/43043.htmlhttp://www.aygfsteel.com/AllenYoung/services/trackbacks/43043.htmlSCA Module是紧耦åˆcomponent的最大的¾l„åˆç‰©ï¼ŒåŒæ—¶ä¹Ÿæ˜¯æ¾è€¦åˆSCA System中的基本å•å…ƒåQŒä¹Ÿž®±æ˜¯è¯ß_(d¨¢)¼Œå¾ˆå¤šç´§è€¦åˆçš„东东组æˆModuleåQŒç„¶åŽå¾ˆå¤šModule¾l„æˆæ¾è€¦åˆçš„System。我们都知é“一味的紧耦åˆå?qi¨¢ng)æ¾è€? åˆéƒ½æ˜¯ä¸å¥½çš„åQŒè¿‡åˆ†çš„紧耦åˆä¼?x¨¬)é™ä½Žç³»¾lŸçš„ç‰|´»æ€§ã€å¯é‡ç”¨æ€§ç­‰åQŒè€Œè¿‡åˆ†çš„æ¾è€¦åˆä¼?x¨¬)导致系¾lŸæ€§èƒ½çš„下é™ã€å¼€å‘难度增加ã€ä»£ç ä¸ç›´è§‚ã€æµ‹è¯•éš¾åšç­‰åQŒå› æ­¤ï¼Œé€‰æ‹©ä¸€ 个åˆé€‚的紧耦åˆå’Œæ¾è€¦åˆä¹‹é—´çš„äÍ(f¨´)界点是很é‡è¦çš„，而Modulež®±æ˜¯˜q™ä¸ªä¸´ç•Œç‚V€?br />
Module有如下几个标准特性：(x¨¬)
  1. 定义äº?ji¨£n)Componentå¯è§æ€§çš„边界åQŒComponentä¸å¯ä»¥åœ¨Module之外直接被引用ã€?/font>
  2. 在åŒä¸€ä¸ªModule内，Service的本地调用采用by-reference语义åQˆé™¤äº?ji¨£n)声明äØ?f¨´)remotable的接å£ï¼‰(j¨ª)。在Module之间åQŒServiceçš„è¿œ½E‹è°ƒç”¨é‡‡ç”¨by-value语义ã€?/font>
  3. 定义äº?ji¨£n)部¾|²çš„å•å…ƒã€‚Module用æ¥ä¸ºSCA Systemæä¾›business serviceã€?/font>
Moduleç”±sca.module中的module元素定义。下é¢æ˜¯moduleçš„schemaåQ?br />
<?xml (t¨©ng)version="1.0" (t¨©ng)encoding="ASCII"?>
<module (t¨©ng)xmlns=â€http://www.osoa.org/xmlns/sca/0.9â€?br /> (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)xmlns:v="http://www.osoa.org/xmlns/sca/values/0.9" (t¨©ng)name="xs:NCName">

 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<entryPoint (t¨©ng)name="xs:NCName" multiplicity="0..1 (t¨©ng)or (t¨©ng)1..1 (t¨©ng)or (t¨©ng)0..n (t¨©ng)or (t¨©ng)1..n" (t¨©ng)?>*
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<interface.interface-type (t¨©ng)/>
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<binding.binding-type (t¨©ng)uri="xs:anyURI" (t¨©ng)/>+
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<reference>wire-target-URI</reference>
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)</entryPoint>

 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<component (t¨©ng)name="xs:NCName">*
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<implementation.implementation-type (t¨©ng)/>
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<properties>?
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<v:property-name>property-value</v:property-name>+
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)</properties>
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<references>?
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<v:reference-name>wire-target-URI</v:reference-name>+
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)</references>
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)</component>

 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<externalService (t¨©ng)name="xs:NCName">*
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<interface.interface-type (t¨©ng)/>+
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<binding.binding-type (t¨©ng)uri="xs:anyURI" (t¨©ng)/>*
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)</externalService>

 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<wire>*
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<source.uri>wire-source-URI</source.uri>
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)<target.uri>wire-target-URI</target.uri>
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)</wire>

</module>

 < module /> çš„name属性表½Cºmoduleçš„å字，在一个SCA System中是唯一的。这个åå­—ä¸èƒ½åŒ…å?æˆ?字符ã€?br /> < module /> 包å«0或nä¸?/font> < entryPoint /> ã€?/font> < component /> ã€?/font> < externalService /> ã€?/font> (t¨©ng)<wire />元素åQŒè¿™äº›å…ƒç´ çš„å«ä¹‰åœ¨ä¹‹å‰çš„éšç¬”ä¸? å·²ç»è¯´è¿‡ã€‚Component包å«Module的业务逻辑åQŒW(xu¨¦)ireæè¿°Component之间的Service的连接，Entry Point定义Moduleæ供的ã€å¯ä¾›å¤–部访问的public serviceåQŒExternal Service表示Module对外部Serviceçš„ä¾èµ–ã€?br />

Component

Component 是Implementationçš„é…¾|®å®žä¾‹ï¼Œå®ƒå³æä¾› Service也消费Service。多个Componentå¯ä»¥ä½¿ç”¨òq‰™…¾|®åŒä¸€ä¸ªImplementationåQŒåªè¦æ¯ä¸ªComponent都采用ä¸å? çš„é…¾|®ã€‚Implementation通过component typeæ¥å®šä¹‰å¯ç”±Componenté…置的aspect。SCA支æŒå¤šç§ä¸åŒçš„实现技术，如Javaã€BEPLã€C++。SCA定义äº?ji¨£n)一¿Uå¯æ‰©å±•æœºåˆ¶æ? 引入新类型的Implementation。目å‰çš„规范ä¸æŒ‡å®šå¿…™å»è¢«SCA runtime支æŒçš„实现技术，供应商å¯ä»¥é€‰æ‹©ä»–们认äØ“(f¨´)é‡è¦çš„技术予以支æŒã€‚我们æ¥çœ‹ä¸€ä¸‹Componentçš„schemaåQ?br />
<component (t¨©ng)name="xs:NCName">*
 (t¨©ng) (t¨©ng) (t¨©ng) <implementation.implementation-type (t¨©ng)/>
 (t¨©ng) (t¨©ng) (t¨©ng) <properties>?
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) <v:property-name>property-value</v:property-name>+
 (t¨©ng) (t¨©ng) (t¨©ng) </properties>
 (t¨©ng) (t¨©ng) (t¨©ng) <references>?
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) <v:reference-name>wire-target-URI</v:reference-name>+
 (t¨©ng) (t¨©ng) (t¨©ng) </references>
</component>
<component />çš„name属性表½Cø™¿™ä¸ªcomponentçš„å字，它必™åÕdœ¨å½“å‰module中是唯一的。å¦å¤–，当å‰module中的entry pointå’Œexternal servicä¸å¯ä»¥å’Œcomponenté‡åã€?br /><component />å¿? ™åÀLœ‰ä¸€ä¸ªimplementationå­å…ƒç´ ï¼Œå®ƒæŒ‡å‘component的具体实现。implementation元素的å字由两部分组æˆï¼š(x¨¬) "implementation"+代表implementation-typeçš„é™å®šè¯åQŒä¾‹å¦‚：(x¨¬)implementation.java表示是由 Javaæ¥å®žçŽŽÍ¼Œimplementation.bepl表示是由BPELæ¥å®žçŽ°ã€?br />
<implementation.java (t¨©ng)class="services.myvalue.MyValueServiceImpl"/>
<implementation.bpel (t¨©ng)process="â€?/>

Component Type

Component Type表示一个Implementationçš„å¯é…置的东东，它由Implementationæ供的Serviceã€å¯è®„¡½®çš„å…³è”到其他 Serviceçš„Referenceå’Œå¯è®„¡½®çš„属性组æˆã€‚属性和Referencež®†åœ¨ä½¿ç”¨˜q™ä¸ªImplementationçš„Component中具ä½? é…ç½®ã€?br />¼‹®å®šä¸€ä¸ªComponent Type需è¦ä¸¤ä¸ªæ­¥éª¤ï¼š(x¨¬)
  1. 从Implementation自èín获得信æ¯åQˆä¾‹å¦‚：(x¨¬)从code annotation获得信æ¯åQ?/font>
  2. 从SCA component typeæ–‡äšg获得信æ¯åQˆXMLé…置文äšgåQ?/font>
˜q™æ˜¯æ—¶ä¸‹‹¹è¡Œçš„åšæ³•ï¼Œæ—¢å¯ä»¥ä»Žcode annotation˜q›è¡Œé…ç½®åQŒä¹Ÿå¯ä»¥ä»ŽXML˜q›è¡Œé…ç½®åQŒå¦‚果两者åŒæ—¶ä‹É用，code annotation的优先çñ”高，但是两者的é…ç½®è¦ç»Ÿä¸€ã€?br />SCA component typeæ–‡äšg的扩展åä¸?.componentType"åQŒå…¶ä¸­é€šè¿‡componentType元素æ¥è¿›è¡Œé…¾|®ï¼Œæˆ‘们æ¥çœ‹çœ‹å®ƒçš„schemaåQ?br />
<?xml (t¨©ng)version="1.0" (t¨©ng)encoding="ASCII"?>
<componentType (t¨©ng)xmlns="http://www.osoa.org/xmlns/sca/0.9" (t¨©ng)>
 (t¨©ng) (t¨©ng) (t¨©ng) <service (t¨©ng)name="xs:NCName">*
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) <interface.interface-type/>
 (t¨©ng) (t¨©ng) (t¨©ng) </service>
 (t¨©ng) (t¨©ng) (t¨©ng) <reference (t¨©ng)name="xs:NCName" (t¨©ng)multiplicity="0..1 (t¨©ng)or (t¨©ng)1..1 (t¨©ng)or (t¨©ng)0..n (t¨©ng)or (t¨©ng)1..n"?>*
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) <interface.interface-type/>
 (t¨©ng) (t¨©ng) (t¨©ng) </reference>
 (t¨©ng) (t¨©ng) (t¨©ng) <property (t¨©ng)name="xs:NCName" (t¨©ng)type="xs:QName" (t¨©ng)many="xs:boolean"? default="xs:string"? (t¨©ng)required="xs:boolean"?/>*
</componentType>
<service />表示˜q™ä¸ªComponent Typeæ供的ServiceåQŒå¯ä»¥é€šè¿‡<interface.interface-type />讄¡½®å…¶äØ“(f¨´)remotableã€?/font><reference />表示˜q™ä¸ªComponent Typeä¾èµ–的其他ServiceåQŒä¹Ÿå¯ä»¥é€šè¿‡<interface.interface-type />讄¡½®å…¶äØ“(f¨´)remotableåQŒmultiplicity属性表½Cºå¯ä»¥å…³è”到˜q™ä¸ªReferenceçš„Wireçš„æ•°é‡ã€?/font><property />表示˜q™ä¸ªComponent Typeå¯é…¾|®çš„属性ã€?br />让我们æ¥çœ‹ä¸€ä¸ªä¾‹å­ï¼ŒJavaæ–‡äšgMyValueServiceImpl是这个例å­ä¸­çš„ImplementationåQŒå…¶SCA component type如下åQ?br />
<?xml (t¨©ng)version="1.0" (t¨©ng)encoding="ASCII"?>
<componentType (t¨©ng)xmlns="http://www.osoa.org/xmlns/sca/0.9">
 (t¨©ng) (t¨©ng) (t¨©ng) <service (t¨©ng)name="MyValueService">
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) <interface.java (t¨©ng)interface="services.myvalue.MyValueService"/>
 (t¨©ng) (t¨©ng) (t¨©ng) </service>
 (t¨©ng) (t¨©ng) (t¨©ng) <reference (t¨©ng)name="customerService">
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) <interface.java (t¨©ng)interface="services.customer.CustomerService"/>
 (t¨©ng) (t¨©ng) (t¨©ng) </reference>
 (t¨©ng) (t¨©ng) (t¨©ng) <reference (t¨©ng)name="stockQuoteService">
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) <interface.java (t¨©ng)interface="services.stockquote.StockQuoteService"/>
 (t¨©ng) (t¨©ng) (t¨©ng) </reference>
 (t¨©ng) (t¨©ng) (t¨©ng) <property (t¨©ng)name="currency" (t¨©ng)type="xsd:string" (t¨©ng)default="USD"/>
</componentType>

相应的Java代ç å¦‚下åQ?br />

// (t¨©ng)MyValueService (t¨©ng)interface.
package (t¨©ng)services.myvalue;

public (t¨©ng)interface (t¨©ng)MyValueService (t¨©ng){
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)public (t¨©ng)void (t¨©ng)calculate();
}

// (t¨©ng)MyValueServiceImpl (t¨©ng)class
package (t¨©ng)services.myvalue;

import (t¨©ng)services.customer.CustomerService;
import (t¨©ng)services.stockquote.StockQuoteService;

public (t¨©ng)class (t¨©ng)MyValueServiceImpl (t¨©ng)implements (t¨©ng)MyValueService (t¨©ng){

 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)// (t¨©ng)Code (t¨©ng)annotation. (t¨©ng)å’ŒXML的功能相åŒï¼Œä¸¤è€…å–一个ä‹É用就够了(ji¨£n)ã€?/span>
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)@Property
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)private (t¨©ng)String (t¨©ng)currency (t¨©ng)= (t¨©ng)"USD";

 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)@Reference
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)private (t¨©ng)CustomerService (t¨©ng)customerService;

 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)@Reference
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)private (t¨©ng)StockQuoteService (t¨©ng)stockQuoteService;

 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)public (t¨©ng)void (t¨©ng)calculate() (t¨©ng){
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)// (t¨©ng)do (t¨©ng)your (t¨©ng)real (t¨©ng)business (t¨©ng)logic (t¨©ng)here.
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)}
}

Implementation

Implementation 是业务逻辑的具体实玎ͼŒ˜q™äº›ä¸šåŠ¡é€»è¾‘ä¼?x¨¬)æ供或消费Service。SCA支æŒå¤šç§å®žçŽ°æŠ€æœ¯ï¼Œå¦‚Javaã€BPEL或C++。我们已¾l知é“， Serviceã€Referenceå’ŒProperty是Implementation中关于酾|®çš„东东åQŒä»–们组æˆComponent Type。在˜qè¡Œæ—Óž¼ŒImplementation Instance是Implementation的实例化åQŒå®ƒæ供的业务逻辑和Implementation中的相åŒåQŒä½†Propertyå’? Reference则å–决于Component中的é…置。下图æ˜qîCº†(ji¨£n)Component Typeã€Componentã€Implementationå’ŒImplementation Instance之间的关¾p»ï¼š(x¨¬)
SCA-relationship-between-implementation-and-implementation-instance.PNG

Interface

Interface 负责定义一个或多个business function。这些business function通过Serviceæä¾›¾l™å¤–部，外部通过Reference使用它们。Serviceç”Þp‡ªå·±å®žçŽ°çš„Interface定义。SCA支æŒå¦? ä¸?¿UInterfaceåQ?br />
  • Java interfaces
  • WSDL 1.1 portTypes
  • WSDL 2.0 interfaces
我们一个一个æ¥çœ‹ï¼š(x¨¬)

<interface.java (t¨©ng)interface="NCName" (t¨©ng)…Â?/span>/>
其中interface属性äØ“(f¨´)Java interfaceçš„å…¨å（包括packageåQ‰ã€‚例如：(x¨¬)
<interface.java (t¨©ng)interface="services.stockquote.StockQuoteService" />

<interface.wsdl (t¨©ng)interface="xs:anyURI" (t¨©ng)…Â?/span>/>
其中interface属性äØ“(f¨´)portType/interfaceçš„URIåQŒå…¶æ ¼å¼ä¸?lt;WSDL-namespace-URI>#wsdl.interface(<portType or Interface-name>)。例如：(x¨¬)
<interface.wsdl (t¨©ng)interface="http://www.stockquote.org/StockQuoteService#wsdl.interface(StockQuote)"/>

如果使用Java interfaceåQŒServiceæ–ÒŽ(gu¨©)³•çš„ä¼ å…¥å‚æ•°å’Œ˜q”回值å¯ä»¥ä‹É用Java class或Primitive type。最好ä‹É用SDO生æˆçš„Java classåQŒå› ä¸ºå®ƒä»¬å’ŒXML之间åšäº†(ji¨£n)æ•´åˆã€‚（SDO也是IBM推出的一个SOA¾pÕdˆ—的标准。）(j¨ª)
如果使用WSDLåQŒServiceæ–ÒŽ(gu¨©)³•çš„ä¼ å…¥å‚æ•°å’Œ˜q”回值则使用XML schemaæ述。XML schema¿Uæ˜q°çš„å‚数以SDO DataObjectçš„åÅžå¼æš´éœ²ç»™å¼€å‘者ã€?br />
一 个Component Implementationçš„Service是å¦æ˜¯remotable的是由Serviceçš„Interface定义的。如果ä‹É用JavaåQŒäØ“(f¨´) Interfaceæ·ÕdŠ @Remotable annotationå¯ä»¥æŠŠService声明为remotable。WSDL定义的interface永远是remotableçš„ã€?br /> 典型的remoteable interface是粗力度的，用于æ¾è€¦åˆçš„交互。Remotable Service Interfaceä¸å…许函数é‡è½½ã€‚无论是åœ?Module之外˜q˜æ˜¯åœ¨Module内的其他Component中ä‹Éç”?/font>remotable ServiceåQŒæ•°æ®äº¤æ¢éƒ½é‡‡ç”¨by-value语义ã€?br />Remotable Servicedçš„Implementationå¯èƒ½ä¼?x¨¬)在Service调用˜q‡ç¨‹ä¸­æˆ–调用之åŽæ”¹å˜ä¼ å…¥å‚æ•°åQŒä¹Ÿå¯èƒ½åœ¨è°ƒç”¨ä¹‹åŽä¿®æ”¹è¿”回倹{€‚如æž? remotable Service被locally或remotely调用åQŒSCA containerä¼?x¨¬)ä¿è¯ä¼ å…¥å‚æ•°å?qi¨¢ng)˜q”回值的改å˜å¯¹Service的调用者是ä¸å¯è§çš„åQˆè¿™ž®±æ˜¯by-value语义åQ‰ã€‚下é¢æ˜¯ä¸€ä¸ªremotable java interface的例å­ï¼š(x¨¬)
package (t¨©ng)services.hello;

@Remotable
// (t¨©ng)@AllowsPassByReference
public (t¨©ng)interface (t¨©ng)HelloService (t¨©ng){
 (t¨©ng) (t¨©ng) (t¨©ng) (t¨©ng)public (t¨©ng)String (t¨©ng)sayHello(String (t¨©ng)message);
}
ç”±External Serviceæ供的Service永远是remotable的。å¯ä»¥ä‹É用@AllowsPassByReference annotationå…许一个remotable Service在被åŒä¸€Module中的其他Component调用时ä‹É用by-reference语义åQŒè¿™æ ·å¯ä»¥æ高性能ã€?br />
ç”±local Interfaceæ供的Serviceåªèƒ½åœ¨åŒä¸€Module中ä‹É用，它们ä¸èƒ½é€šè¿‡Entry Pointå‘布到外部。如果ä¸å£°æ˜Ž@RemotableåQŒJava interface默认为local。典型的local Interface是细¾_’度的，用于紧耦åˆçš„交互。它å…许æ–ÒŽ(gu¨©)³•é‡è²åQŒåƈ采用by-reference语义ã€?br />

]]>SCA Assembly Model Overviewhttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/43019.htmlAllen YoungAllen YoungTue, 25 Apr 2006 06:34:00 GMThttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/43019.htmlhttp://www.aygfsteel.com/AllenYoung/comments/43019.htmlhttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/43019.html#Feedback1http://www.aygfsteel.com/AllenYoung/comments/commentRss/43019.htmlhttp://www.aygfsteel.com/AllenYoung/services/trackbacks/43019.htmlSCA Assembly Modelæ¶ëŠ›–äº?ji¨£n)两¿UmodelåQ?br />
  • 用楾l„装紧耦åˆæœåŠ¡çš„model
  • 用楾l„装æ¾è€¦åˆé¢å‘æœåŠ¡¾pÈ»Ÿçš„model

SCA Assembly Modelç”׃¸€¾pÕdˆ—çš„artifact¾l„æˆåQŒè¿™äº›artifactç”±XMLæ–‡äšg中的element定义。下é¢å…ˆ¾l™å‡º˜q™äº›artifactçš„åè¯ï¼š(x¨¬)
  • Module
  • Service
  • Component
  • Entry Point
  • Reference
  • External Service
  • Wire
  • Implementation
  • SCA System
  • Subsystem
  • Module Component
最基本的artifact是ModuleåQŒå®ƒæ˜¯SCA的部¾|²å•å…ƒï¼Œç”¨æ¥ä¿å­˜å¯ä»¥è¢? remote讉K—®çš„Service。一个Module包å«ä¸€ä¸ªæˆ–几个ComponentåQŒè¿™äº›Component包å«äº?ji¨£n)这个Module所è¦æ供的 business function。Component把这些function以Serviceçš„åÅžå¼æ供给外界åQŒè¿™äº›Serviceå›_¯ä»¥è¢«åŒä¸€Model中的其他 Component使用åQŒä¹Ÿå¯ä»¥é€šè¿‡Entry Point在Module之外使用。Component也å¯ä»¥ä¾èµ–于其他Componentæ供的ServiceåQŒè¿™äº›ä¾èµ–å«åšReferenceã€? Referenceå›_¯ä»¥æ˜¯å¯¹åŒä¸€Module内其他Componentæ供的Serviceçš„linkåQŒä¹Ÿå¯ä»¥æ˜¯å¯¹Module外ServiceåQˆå…¶ä»? Moduleæ供的ServiceåQ‰çš„link。连接到Module外部Serviceçš„Reference在其Module中被定义为External Service。Referenceå’ŒService之间的连接也包å«åœ¨è¿™ä¸ªModule中，用Wireæ¥è¡¨½Cºã€?br />
一个Componentç”׃¸€ä¸ªé…¾|®å¥½çš„Implementation¾l„æˆåQŒè¿™ä¸ªImplementationž®±æ˜¯å®žçŽ°business functionçš„é‚£ŒD늨‹åºã€‚Component使用具体的值æ¥é…ç½®Implementation中声明的å¯é…¾|®çš„属性，Component也å¯ä»¥æŠŠ Implementation中声明的wiring of referenceé…置到具体的目标Service上去ã€?br />
Module部çÖv在SCA System中。一个SCA System往往表示一¾l„相关Service的集åˆã€‚äØ“(f¨´)äº?ji¨£n)方便å¾ç«‹å’Œé…ç½®SCA SystemåQŒSubsystemå¯ä»¥ç”¨æ¥å¯¹Module˜q›è¡Œåˆ†ç»„和酾|®ã€‚Subsystem包å«Module ComponentåQˆModuleçš„é…¾|®å¥½äº?ji¨£n)的实例åQ‰ï¼Œå’ŒModule一æ øP¼Œå®ƒä¹Ÿæœ‰Entry Pointã€External Serviceå’ŒW(xu¨¦)ireã€?br />
下é¢é™„上两张图æ¥å±•ç¤º˜q™äº›artifact之间的关¾p…R€?br />SCA-module-assembly-diagram.PNG
SCA-system-assembly-diagram.PNG

]]>SOA and Web services 新手入门http://www.aygfsteel.com/AllenYoung/archive/2006/04/25/42969.htmlAllen YoungAllen YoungTue, 25 Apr 2006 03:09:00 GMThttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/42969.htmlhttp://www.aygfsteel.com/AllenYoung/comments/42969.htmlhttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/42969.html#Feedback0http://www.aygfsteel.com/AllenYoung/comments/commentRss/42969.htmlhttp://www.aygfsteel.com/AllenYoung/services/trackbacks/42969.htmlSOA and Web services 新手入门åQŒè{自IBM DeveloperWorksåQŒå®ƒçš?a >SOA and Web Service专区是学ä¹?f¨¤n)SOA的很好的资æºä¸­å¿ƒ(j¨©)。本文章的内容如下：(x¨¬)

  1. 什么是é¢å‘æœåŠ¡çš„体¾pÈ»“构（SOAåQ‰ï¼Ÿ
  2. 我å¯ä»¥ç”¨é¢å‘æœåŠ¡çš„体¾pÈ»“æž„åšä»€ä¹ˆï¼Ÿ
  3. æž„æˆ SOA 的技术是什么？
  4. SOA 与其他技术的关系如何åQ?/li>
  5. 我å¯ä»¥å¦‚何构å»?SOA ¾pÈ»ŸåQ?/li>
  6. 我å¯ä»¥å¦‚何æ高我çš?SOA 技能？
  7. IBM 的什么工具和产å“å¯ç”¨äº?SOAåQ?/li>
IBM肯定ä¼?x¨¬)äØ?f¨´)自己åšå¹¿å‘Šï¼Œå‘µå‘µåQŒå„ä½ä¿æŒæ¸…醒就是了(ji¨£n)ã€?br />

]]>Elune Team 声明http://www.aygfsteel.com/AllenYoung/archive/2006/04/25/42958.htmlAllen YoungAllen YoungTue, 25 Apr 2006 02:23:00 GMThttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/42958.htmlhttp://www.aygfsteel.com/AllenYoung/comments/42958.htmlhttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/42958.html#Feedback0http://www.aygfsteel.com/AllenYoung/comments/commentRss/42958.htmlhttp://www.aygfsteel.com/AllenYoung/services/trackbacks/42958.htmlElune Teamç”±Allen YoungåQŒatlantaåQŒHelenaå’Œsilver.sun¾l„æˆåQŒè¿‘期目标äØ“(f¨´)å‚加2006 IBMæ¯ä¸­å›½é«˜æ ¡SOA应用大赛åQŒå› æ­¤ä¼š(x¨¬)在比赛期间在BlogJava SOA Team Blog˜q›è¡Œç›¸å…³è®¨è®ºåQŒå†…容以SOAä¸ÞZ¸»åQŒä¼š(x¨¬)涉åŠ(qi¨¢ng)å‚èµ›™å¹ç›®½Ž¡ç†åQŒå›¢é˜Ÿæ–‡åŒ–ç­‰ã€?br />

Allen Young 2006-04-25 10:23 å‘表评论
]]>BlogJava SOA Team Blog公告http://www.aygfsteel.com/AllenYoung/archive/2006/04/25/42955.htmlAllen YoungAllen YoungTue, 25 Apr 2006 02:17:00 GMThttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/42955.htmlhttp://www.aygfsteel.com/AllenYoung/comments/42955.htmlhttp://www.aygfsteel.com/AllenYoung/archive/2006/04/25/42955.html#Feedback0http://www.aygfsteel.com/AllenYoung/comments/commentRss/42955.htmlhttp://www.aygfsteel.com/AllenYoung/services/trackbacks/42955.html‹Æ¢è¿Žå„ä½å¯¹SOAæ„Ÿå…´­‘£çš„朋å‹åŠ å…¥è®¨è®ºBlogJava SOA Team BlogåQŒä¸‹é¢æ˜¯ä¸ªäh的几点声明，å„ä½å¯ä»¥¾l™æˆ‘å»ø™®®æˆ–补充ã€?br />
  1. éšç¬”è¦ä¸ŽTeam Blog主题相关åQŒå¦åˆ™å°†åˆ é™¤ã€?/font>
  2. åšä¸€ä¸ªCritical ThinkeråQŒå¯¹è‡ªå·±çš„言è®ø™´Ÿè´£ã€?/font>
  3. ‹Æ¢è¿Žå„ç§è§‚点åQˆæˆ‘们需è¦ä¸åŒçš„声音åQ‰ï¼Œ‹Æ¢è¿Žäº‰è®ºåQŒä¸‹Æ¢è¿Žäº‰åµã€?/font>
  4. éšç¬”è¯ïL(f¨¥ng)”¨Courier New字体åQ?å·å­—åQŒä»¥ä¾¿ä¿æŒæ•´ä½“风æ ég¸€è‡´ã€?br />

SOA是一¿Uæ€åº¦åQŒè€Œä¸æ˜¯ä¸€¿U技术ã€?br />

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