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SLA生成器slang简介

SLAng - SLA notation generator A language for defining SLAs
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SLAng - SLA notation generator
A language for defining SLAs
Davide Lamanna, James Skene
and Wolfgang Emmerich
University College London
Computer Science Department
{d.lamanna | j.skene | w.emmerich}@cs.ucl.ac.uk

Agenda
•
Goals
•
Approach
•
Structure of SLAng
•
Example
•
Conclusion and future work

Goals
•
Producing a formal language, with a well defined
syntax and semantics for describing service level
specifications (SLSs)
•
Specification of non functional features (service level)
of contracts between independent parties to allow the
integration with the functional design of a distribuited
component system
•
Parameterisation, compositionality, validation of
service level agreements

Approach 1/3
•
To concentrate on specific, state-of-the-art
application server technologies (J2EE)
•
To associate performance targets with
identifiable ASP components
•
To use popular and standard information
exchange formats (XML)

Approach 2/3
•
The semantics is not dependent on
complete models of the ASP. It is instead
defined in terms of the domains of the
performance properties
•
QoS properties are somewhat dependent
on the system tier being described
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