Web Service Oriented Architecture
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There are two main types of distributed systems: request/response and message passing. Request/response systems focus on invoking operations and return values, while message passing focuses on constructing and dispatching messages without expecting a response. There are also two main architecture styles: object-oriented and service-oriented. Object-oriented styles involve communicating with object instances and have stateful communications, while service-oriented styles involve communicating with services through a standardized interface in a stateless manner. A shift is occurring from object-oriented to service-oriented architectures, as the latter allows for looser coupling and better scalability through messages. Web services can support both request/response and message passing systems.
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- 1. Web Service Oriented Architecture Jorgen Thelin Chief Scientist Cape Clear Software Inc.
- 14. Choosing Architecture Style and Implementation Technology
- 15. Comparison of Architecture Styles Attribute Object-oriented Service-oriented Granularity Object instances Service instances Main Focus Marshalling of parameter values Creation and formatting of request payloads Request routing Routed to unique object instance One endpoint address per service Invocation style Stateful Stateless Lifecycle management operations Yes No Application interface Specific to the object / class Description is middleware specific (e.g. IDL) Specific to the service Description is standard specific (e.g. WSDL) Payload / data format description Usually middleware specific (e.g. IDL) Part of service description (e.g. XML Schema in WSDL)
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