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Question:What is a reusable Service?

It is an autonomous, reusable, discoverable, stateless functionality that has the necessary granularity, and can be part of a composite application or a composite service.
A reusable service should be identified with a business activity described by the service specifications (design-time contract).
- A service’s constraints, including security, QoS, SLA, usage policies, may be defined by multiple run-time contracts, multiple interfaces (the WSDL for a SOAP Web Service), and multiple implementations (the code).
- A reusable service should be governed at the enterprise level throughout its entire lifecycle, from design-time through run-time. Its reuse should be promoted through a prescriptive process, and that reuse should be measured.

Talking about Service identification, which approach between top-down and bottom-up methodologies encourages re-use and mantainance ?
Since the top-down approach is business-driven it can be practical to separate the different concerns of business and IT on different plans, providing a common ground in between. So in most situations it the most appropriate if you want to improve reuse and ROI in the medium/long term. Anyway

asked Sep 13, 2013 in Cloud-Computing by rajesh
edited Sep 12, 2013
0 votes

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