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

Chapter 2. Related Work 19Figure 2.2: Wrapper Schema. Adopted from [23]Selecting candidate services – This is the first process of the wrapping technique.The process is meant to identify and allocate potential services in legacysystem. However the approach notices meaning of introduction of a structuralprocess in order to support service allocation, it does not provide own solution,but rather refers to work of Sneed [76] or SMART [49][10]Wrapping the selected use case – The second process is a core part of thetechnique. This process aims at wrapping identified use cases into service. It isalso the most complex process which is composed of three sub–processes [23]:1. Service Identification –aims at selection of use cases that can be transformedto services with respect to previously described characteristic (see 4.3.1)andbraking down complex use cases into more elementary [23]. Complex servicesare not removed from the list services. They became process servicesthat utilise lower level services to perform tasks.2. Reverse Engineering –during the second sub–activity, the system is analysedin terms of interaction with user in order to gain broad and in depth coverageof main and alternative scenarios. As the result, information about request