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

Chapter 3. Architectural Patterns 35as very detailed tasks like room planning. The Alexander’s idea inspired KentBeck and Ward Cunningham. They presented their observations and adaptationsof patterns to Software Engineering during Object Oriented Programming, Systemand Language (OOPSLA) conference in 1987 [56]. However , the origin ofpatters are patterns used in architecture, the patterns in Software Engineeringdo not refer only to architecture of system. The general classification presentedin “Patterns in the field of software engineering”[56] groups patterns into threemain categories that in turn are divided into seven subcategories (see figure 3.2.The main categories are[56] :1. Implementation patterns – present implementation of the system from differentpoints of view. Those patterns are further broken into four morecategories.(a) Reference Architectural Patterns – this category contains patterns thatare dedicated to a particular domain [56].(b) Design Patterns – in general, design patterns define, explain and solvedesign problems in an object oriented system [56].(c) Analysis Patterns – those patterns are rather a group of concepts thatrepresent a common modeling in business [56].(d) Architectural Patterns – architectural patterns provide predefined subsystemswith relations between them and responsibilities of those subsystems[56].2. Process and improvement patterns – this type of patterns present solutionsfor tasks that are common during development and improvement activities.The category is further broken into two subcategories:(a) Process Patterns – the patterns show and guide how to conduct specifictasks in the development of process [56].(b) Software process Improvement Patterns – define improvements for alreadyintroduced processes [56].3. Configuration management patterns – contains only one subcategory.(a) Software configuration management patterns – the patterns describeprocesses that are associated with whole lifecycle of a product(see [56]for more detailed information about types of patterns ).3.1.2 Definition of Architectural PatternsDespite the fact that the classification [56] of patterns in Software Engineeringclearly separates Architectural Patterns from Design Patterns, it is not always