Developing services in a Service Oriented Architecture for EAs
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This document discusses developing services in a Service Oriented Architecture (SOA) for evolutionary algorithms. It covers SOA frameworks, design principles for stateless and independent services, and an example implementation using OSGi. The presentation outlines existing EA frameworks, defining services, principles like avoiding global state, and implementing services as OSGi bundles with declarative interfaces. It concludes that SOA provides independence while OSGi fulfills requirements like stateless design and supports dynamic deployment of distributed services.
Developing services in a Service Oriented Architecture for EAs
- 1. Developing services in a Service Oriented Architecture for EAs P. García-Sánchez, M. G. Arenas, A. M. Mora, P. A. Castillo, C. Fernandes, P. de las Cuevas, G. Romero and JJ. Merelo pgarcia@atc.ugr.es @osgiliathSOA domingo 7 de julio de 2013
- 2. Agenda Frameworks Service Oriented Architecture Design principles Technology Example of development domingo 7 de julio de 2013
- 3. State of the Art EasyLocal, SIGMA, ECJ, MALLBA, DREAM, Algorithm::Evolutionary, ParadiseEO, OpenBeagle, HeuristicLab, METCO, jMetal, GAlib, GridUFO... domingo 7 de julio de 2013
- 4. SOA domingo 7 de julio de 2013
- 5. Services Input/output functions Must not have state Order not defined Designed as abstract as possible domingo 7 de julio de 2013
- 6. Design principles Not global variables. Example: not use a fitness with a counter. Undistinguishable from local or remote. Example: Population or Parameters Request response function. Example: list of fitness in Fitness service Not make assumptions in order. Example: calculate fitness with each change domingo 7 de julio de 2013
- 7. Other technological restrictions Services can be dynamically bound Services can appear or disappear in execution time Not specific source code for distribution must be added in the code domingo 7 de julio de 2013
- 8. OSGi Specification for SOA in VMs Packet abstraction Versioning Dynamic components domingo 7 de julio de 2013
- 9. OSGiLiath Based in SOA-EA: Service Oriented Evolutionary Algorithms, Soft. Comp. 2013. OSGi Laboratory for implementation and testing of heuristics Based in OSGi: Event administration Declarative Services ECF domingo 7 de julio de 2013
- 10. Step 1: Bundle creation MANIFEST.MF Service description files Interfaces Implementation classes domingo 7 de julio de 2013
- 11. Step 2: Implementing services domingo 7 de julio de 2013
- 12. Step 3: adding communication Discovery (Zeroconf, Zookeeper...) and distribution (R-OSGi, ActiveMQ, REST, SOAP...) Not code added for distribution/modification domingo 7 de julio de 2013
- 13. Conclusions SOA offers independence of language, distribution or OS Services must be designed taking into account stateless behavior, unordered execution and volatile existence OSGi fulfills the previous requirements Future work: scalability, service aggregation, integration with other frameworks domingo 7 de julio de 2013
- 14. Thanks! (and follow @osgiliathSOA!) domingo 7 de julio de 2013