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

Chapter 4. Service Oriented Architecture 89Application Server and WebShare DataPower SOA Appliance. WSRR serves asa source of information about Services for ESB (see 3.2 for service repository),while WebShare DataPower SOA Appliance is an endpoint which is invoked everytime a consumer wants to consume a service, the tool can also enforce policyand routing service request because it has an access to the registry. WebShareDataPower SOA Appliance acts as ESB. In fact it is second out of three (ESB,DataPower, Message Broker) Service Buses provided by IBM.Service Integration – provides two more tools supporting Service Integration.The first tool is WebShare Integration Developer which simplifies process orchestrationwith Business Process Execution Language (BPEL). WebShare ProcessServer (WSPS) is the second tool. It is integrated with Application Server. Thistool enables deployment of previously created processes and mediates ESB flow.WSPS enables communication of those processes with WSRR in order to acquirelatest data. The communication is also established with WebShare Business ServiceFabric, which provides latest service endpoints -dynamic binding.Service Connectivity – The third type of Enterprise Service Bus is IBM Web-Share Message Broker, which is meant to simplify Service communication betweendifferent companies and different technologies applied for web service creation.Service Collaboration – IBM provides a tool simplifying creation of webbasedportals enabling a rule-based access to company’s resources. This toolis IBM WebSphere Portal. Another supporting tool is IBM WebSphere PortletFactory facilitating creation of applications for portals.Service Security – Security is a very important aspect of an application andSOA-applications are not exceptions here. The tool-IBM Tivoli Federated IdentityManager - is introduced to support this aspect of services. The facility provides[60] security infrastructure services, which include secure token services,authorization services, authentication services and directory services for the informationtechnology (IT) infrastructure. In other words, the tools enablingmessage-based authentication and authorization as well as creation of trust relationshipsbetween elements of architecture.4.6 Architectural Patterns in SOAA term “pattern” in the context of Service Oriented Architecture appears veryoften with an adjective “design”, but it is not always clear whether “design” refersto a design pattern in terms of previously stated definitions (see section 3.1.2) orrather refers to design activities including design of whole system (architectural