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Service Modeling & QoS
CSCI927
Service-Oriented Software Engineering
Part I
Service Description and Modeling
Key ideas
q What must a service description contain:
• A description of service functionality?
• Information on how to invoke the service, and how to interpret the outputs
returned (data formats etc.) ?
• Non-functional (Quality-of-Service or QoS) factors?
q Can we devise a service description language that seamlessly spans
the spectrum from business services to web services?
q Let us devise one from scratch….
Description template
service description
<service-id>
goal
<description of functionality>
preconditions
<description>
postconditions
<description>
assumptions
<description>
inputs
<input-item> <format>
.
<input-item> <format>
outputs
<output-item> <format>
.
<output-item> <format>
QoS factors/Contractual factors
<QoS-factor> <value>
.
<QoS-factor> <value>
Describing functionality
q What goals can a service help achieve?
•
Achieving
a condition
•
Maintaining
a condition
•
Avoiding
a condition
• More complex goals: “make the light blink every 5 minutes”
q How are the conditions written?
• In natural language
• In structure document formats: e.g. XML
• In logic
§ First-order logic: descriptions of static worlds
§ Temporal logic: descriptions of dynamic worlds
§ Other: dynamic logic, non-monotonic logic etc.
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