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

Chapter 3. Architectural Patterns 663. Popularity of architectural patterns in real systems – presents occurrencesof particular patterns in real systems.4. Representatives of categories in real systems – this section presents applicationof filter removing patterns that do not exist in pairs with otherarchitectural patterns. The guidelines elaborated in this thesis shall be useful.This also means that the guidelines should be as much applicable aspossible. What in turn means that the migrated pattern should be popular- often used. Not often used patterns reduce usability of the guidelinesbecause they cannot be applied frequently.3.3.1 Definition of Pattern LanguageRobert S. Hanmer and Kristin F. Kocan present [37] broad studies on mutualinteraction of patterns. They provide following definition of pattern language:Pattern languages are collections of patterns that can be used to build somethinglarger than any individual pattern can be used to build. They present two criteriawhich define complete pattern language:1. “Morphologically complete (i.e., complete enough that an entire solution canbe seen from only the patterns present in the language)”2. “Functionally complete (i.e., the language contains patterns that resolve allthe new forces introduced by the use of the languages patterns). ”According to Robert S. Hanmer and Kristin F. Kocan [8]definition of patternlanguage should contain following parts:1. Abstract - provides high-level understanding of the pattern language. Thispart is usually a few sentences long.2. Map - The map is a non-cyclic graph presenting patterns as nodes andrelations between them as arcs. The arcs are directional. Arrowhead pointthe pattern that is influenced by the pattern on the opposite side of the arc.Each pattern presented on the map should contribute to the patterns thatare in relation with this pattern.3. Description - the description presents order of application of all the patternscreating the pattern language.4. Patterns(a) Name - the name of the pattern(b) Problem - the problem that needs to be solved(c) Context - in fact, this is a cause of the problem