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Service-oriented architecture (SOA) definition SOA Slides What is SOA?
Baldwin-Wallace College, US has reference to this Academic Journal, What is SOA? IT architecture in consideration of request – reply applications Application functions are modularized in addition to presented as services Services are loosely coupled Service interface is independent of the implementation SOA Slides ? Raghu Kodali nejug /2005/include/SOAandWebServices.ppt Service-oriented architecture (SOA) definition ?A service-oriented architecture is essentially a collection of services. These services communicate alongside each other. The communication can involve either simple data passing or it could involve two or more services coordinating some activity. Some means of connecting services so that each other is needed.? ( service-architecture /web-services/articles/service-oriented_architecture_soa_definition.html) Many other definitions can be found
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Characteristics of SOA Services have platform independent, self describing interfaces (XML) Messages are formally defined Services can be discovered Services have quality of service characteristics defined in policies Services can be provided on any platform SOA Interoperable Loosely Coupled Re-Usable Composable Why SOA? ? The Cruel Reality Source: Gartner Why SOA? Respond so that business changes Address new needs alongside existing applications Unlock existing application investments Support new channels & complex interactions Support organic business Oracle Financials Standard Interface Custom Order Application Standard Interface New Web Application Standard Interface Siebel CRM Standard Interface Mainframe HR Application Standard Interface .NET Inventory Application Standard Interface New Supply Chain Management Application (Business Process or Composite Application)
Anatomy of a Service Service Consumer Interface Proxy Service Interface Service Implementation New Service Wrapped Legacy Composite Service Service Communication Communicate alongside messages No knowledge about partner Likely heterogeneous Service Consumers Service Producers Service Platform Service Interfaces in addition to Service Implementations Service Consumers Service Delivery Bus Service Rules & Config Change Control Service Reporting & Mgmt
Intradomain Routing A famous quotation from RFC 791
Benefits of SOA Better reuse Build new client functionality on top of existing Business Services Well defined interfaces Make changes without affecting clients Easier so that maintain Changes/Versions are not all-or-nothing Better flexibility Services Communicate With Messages Providing reliability in addition to security so that messages Sending messages across consumers in addition to producers Service Orchestration Service Consumers Service Producers Basic Web Services WSDL Web Service (J2EE, PL/SQL, .NET,C/C++, Legacy ?) Web Service Client (J2EE, .NET, PL/SQL ?) Points so that description Describes Service Finds Service Invokes alongside XML Messages SOAP UDDI Registry Points so that service
Robinson, Peter General Manager
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