Migration of a Chosen Architectural Pattern to Service Oriented ...

Chapter 5. Guidelines 139(a) Frontends(b) UI–MediatorThe first activity is meant to frame the architecture, thus patterns introducedduring this activity have the largest impact on the target architecture. Result ofevery other activity is incorporated into frames crated during the first activity.Service Categorisation and Service Identification are listed together becausethe guidelines try to identify services belonging to particular category. For instance,the code is analysed in order to identify utility related code which isfurther converted into services.Service Orchestration is conducted when all the basic services are identified.The last activity is migration of frontends. Implementation of frontends is notmentioned in the list of activities from section 4.3.2. Frontends request access toapplication. They do not have to be created with implementation of a new system,but the system that is already implemented have some user interface. Thisinterface should also be migrated.The activities listed in this section do not contain Service Specification andService Realisation. Those two activities are performed simultaneously with thesecond and third activity from the list above.5.5.2 StructureSection 4.4 presents three types of architecture. The target architecture cratedas a result of application of guidelines corresponds to Process–Enabled SOA.Mapping between layers of Process–Enabled SOA and the target architecture isfollowing:1. Enterprise Layer – contains application frontends(a) Frontends(b) UI-Mediator2. Process Layer – contains orchestration related services(a) Process Abstraction3. Intermediary layer – facilitates technical and conceptual integration(a) Inventory Endpoints4. Basic Layer – provides core functionality