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Service-oriented architecture - Wikipedia #ril
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Service-oriented architecture (SOA) is a style of software design where SERVICES ARE PROVIDED TO THE OTHER COMPONENTS BY APPLICATION COMPONENTS, through a COMMUNICATION PROTOCOL OVER A NETWORK.
The basic principles of service-oriented architecture are independent of vendors, products and technologies. A service is a DISCRETE UNIT OF FUNCTIONALITY that can be accessed remotely and acted upon and updated INDEPENDENTLY, such as retrieving a credit card statement online.
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A service has four properties according to one of many definitions of SOA:
- It logically represents a BUSINESS ACTIVITY with a specified outcome.
- It is SELF-CONTAINED.
- It is a BLACK BOX FOR ITS CONSUMERS.
- It may consist of other UNDERLYING SERVICES.
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SOA was first termed Service-Based Architecture in 1998 by a team developing integrated foundational management services and then business process-type services based upon UNITS OF WORK and using CORBA for INTER-PROCESS COMMUNICATIONS.
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Different services can be USED IN CONJUNCTION to provide the functionality of a large software application, a principle SOA shares with MODULAR PROGRAMMING.
Service-oriented architecture integrates DISTRIBUTED, SEPARATELY-MAINTAINED and -DEPLOYED software components. It is enabled by technologies and standards that facilitate components' communication and cooperation OVER A NETWORK, especially over an IP network.
"元件之間透過網路互相存取" 就 SOA 而言是必要條件。
Overview
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In SOA, services use PROTOCOLS that describe how they pass and parse messages using DESCRIPTION METADATA. This metadata describes both the functional characteristics of the service and quality-of-service characteristics.
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Service-oriented architecture aims to allow users to COMBINE LARGE CHUNKS OF FUNCTIONALITY to form applications which are built purely from existing services and COMBINING THEM IN AN AD HOC MANNER.
A service presents a SIMPLE INTERFACE to the requester that ABSTRACTS AWAY THE UNDERLYING COMPLEXITY acting as a BLACK BOX. Further users can also access these independent services without any knowledge of their internal implementation.
Defining concepts
- The related buzzword service-orientation promotes loose coupling between services. SOA separates functions into distinct units, or services,[7] which developers make accessible over a network in order to allow users to combine and reuse them in the production of applications. These services and their corresponding consumers communicate with each other by passing data in a well-defined, shared format, or by coordinating an activity between two or more services.
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補記錄 PET 的角色 幫推導 API，由 client 去 drive，Corp IT 再去想其他的應用