面象服务的体系架构(PPT25页)

Mediating the message exchange through an Enterprise Service Bus
▪ This flexibility enables new and existing applications to be easily and
quickly combined to address changing business needs.
▪ Invokable through common communication protocols
Provides interoperability and location transparency.
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服务描述
▪ Services are described using a standardized interface (metadata)
from one valid and consistent state to another.
▪ Defined using explicit interfaces
Independent of service implementations Provides contract between service requestors and service providers
The façade (e.g. an EJB) is then described as the service
▪ Web Services Description Language (WSDL) is the standard
used to describe the service
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服务描述: WSDL
The ability to easily combine/choreograph applications allows IT services to more readily reflect business processes
▪ The SOA infrastructure is also used to facilitate the management of
▪ WSDL (Web Services Description Language) is an XML document that describes
a Service using a number of key elements:
A Port Type defines what the service does, and is described by a number of operations. For each operation the data that it receives and sends is described by a Message The Binding defines how the service (as described by the Port Type) is invoked e.g. SOAP/HTTP, SOAP/JMS. The Port specifies the address where the service is located
面向服务的体系架构(SOA)
© 2002 IBM Corporation
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日程
1. 什么是面向服务的体系架构 2. SOA的价值 3. 构成SOA的技术 4. 如何构建SOA系统 5. IBM的SOA工具与产品 6. 网格计算与SOA
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什么是面向服务的体系架构?
▪ 一个组件模型 ▪ 将应用程序的不同功能单元（服务）通过这些服务
Composable Processes
Composable Services
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构成SOA的技术
▪ 什么是服务 ▪ 服务调用 ▪ 服务的编排 ▪ 服务的发现
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什么是服务?
▪ A well-defined, invokable unit of business function ▪ Accesses business data or facilitates a change of business data
Defines the service, its operations, and input and output parameters Defines how the service is reached and its location
▪ Input and outputs may be simple parameters or XML documents ▪ An existing application can be given a service ‘façade’
applications or resources by
Representing every application or resource as a service with a standardized interface
Enabling them to exchange structured information (messages, documents, ‘business objects’)
business performance and quality of service
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SOA的价值: SOA实现可变的IT架构 …
Flexible Business Models
Transformation Business Process Outsourcing Mergers, Acquisitions & Divestitures
Requires
Flexible IT Architecture
Software Development
Development
Integration Infrastructure
Infrastructure Management
Management
Service Oriented Architecture (SOA)
之间定义良好的接口和契约联系起来。
▪ 接口是采用中立的方式进行定义的，它应该独立于
实现服务的硬件平台、操作系统和编程语言。
▪ 构建在各种这样的系统中的服务可以以一种统一和
通用的方式进行交互。
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为什么采用面向服务的体系架构?
▪ A Service Oriented Architecture enables flexible connectivity of