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

Chapter 3. Architectural Patterns 53Service 2Service 1 Service 3Message BusFigure 3.17: Example usage of Messaging patternperform operations on the systemServer– provides logic of the system.Relationships – - a user invoking operation on the clients invokes serversindirectly. The invocation is transparent. Clients can invoke servers butservers cannot invoke clients (see figure 3.18).Client 1Client 2ServerFigure 3.18: Example usage of Client Server pattern14. Explicit invocationOverview– the pattern determinates way of communication between elementsof the system in distributed environment. This pattern is in fact avariation of Client-Server with one assumption. The assumption says thatconnections between Client and Server are known during design time.ElementsClient– is a frontend of an application.Client Logic– represents logic of the client.Client Broker– wraps connection to a supplierSupplier– application containing logicSupplier Logic– logic of the applicationSupplier Broker– wraps connection to a client