performance analysis and simulation of service based applications rajapaksage jayampathi dm...
TRANSCRIPT
Performance Analysis and Simulation of Service Based
Applications
Rajapaksage JayampathiDM Rasanjalee Himali
Instructor: Dr Xaolin HuCSC 8350
Outline
SOA Mapping SOA Elements to DEVS Elements Software and Hardware Models
Primitive Services Composite Services Generic Messages
Case Study and Simulation Experimental Results
Service Oriented Architecture (SOA)
SOA is an architectural style for building software applications that use services available in a network such as the web.
Applications in SOA are built based on services.
Services: Well defined interfaces/ implementation
independent Self Contained Loosely coupled Can be dynamically discovered New services can be created from an
existing IT infrastructure of systems.
SOA's Find-Bind-Execute Paradigm
Mapping SOA Elements to DEVS Elements
SOA Model Element DEVS Model Element
services (service provider, service client, service broker)
atomic models(service provider, service client, service broker)
service description entity(service-information)
messages entity(service-lookup and service-call)
messaging framework ports and couplings
composition of services coupled models(service providers)
Software and Hardware Models
Primitive Services Composite Services
Communication of Messages
Software and Hardware Models [Contd.]
Service Broker Simulation Model modeled with service registry feature Service provider publish services Service Broker store received service-info messages Service Consumer find services Service broker return matching service-info to consumer
Software and Hardware Models [Contd.]
Service Client Simulation Model modeled with two behaviors such as looking up the service broker and
invoking service provides. service client simulation model looks up the service broker using a desired
endpoint along with the service name If the service client simulation model receives the service-info message from
the service broker, then invoke the service provider; otherwise it may continue to look up the service broker for a given number.
Software and Hardware Models [Contd.]
Service Provider Simulation Model modeled with its own performService() function that fulfills a set of specific
services The service provider simulation model publishes its input ports as
endpoints at the given time. It should be able to handle multiple requests and service them
simultaneously. Accessing information is supported by coupling and ports
Primitive Service
Generic Messages
Three principal usages of messages: publication, lookup, and
subscription
Composite Service Simulation Model
Service composition information should be defined in the service-information message model as binding information.
Each primitive service provider in the composite model does not know the order of invocation.
Case Study Simulation
we describe two WS processes which provide the same required functionality. Both WS Process 1 and 2 (WSP1, WSP2), ensure on-line books acquisition.
WSP 1 WSP 2
Results of DEVS Simulation
Response time Results
0.002.004.006.008.00
10.0012.0014.0016.00
WSP1 WSP2
Web Service
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Tim
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Response time
0.00
2.00
4.00
6.00
8.00
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12.00
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16.00
FI BGA CCr CI RO
WS
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Tim
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Response time- WSP1
Response time- WSP2
References
A SIMULATION FRAMEWORK FOR SERVICE-ORIENTED COMPUTING SYSTEMS, Hessam Sarjoughian, Sungung Kim Muthukumar Ramaswamy, Stephen Yau, 2008 Winter Simulation Conference, 2008
A Discrete-Event Simulation Approach for Evaluation of Service-Based Applications, Maha Driss1,2, Yassine Jamoussi,IEEE ECOWS.2008