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Importance Of Pattern Classification And Categories

2.4.2 Pattern Classification and Categories In order to apply a pattern for a specific problem, it is imperative to locate the right pattern. This necessitates that software developers must read and understand every pattern in order to select the appropriate one. Pattern selection will be easier of patterns are classified into groups of related patterns so that it is easier to choose from the group. Developing a classification scheme involves identifying useful criteria on the basis of which patterns can be classified. Buschmann et al. (1996) have identified the essential properties that any classification scheme should have. These are: i. It should be simple and easy to learn. ii. It should consist of only a few classification criteria. iii. It should reflect the natural properties of patterns. iv. It should be open to the integration of new patterns.…show more content…
Buschmann et al. (1996) classified patterns into three categories: architectural patterns, design patterns and idioms based on the phases in the software development lifecycle. Architectural patterns specify the fundamental structure of the system (for example LAYERS, DISTRIBUTED SYSTEMS). Design patterns give details regarding communications between subsystems (for example ACCESS CONTROL, PUBLISHER-SUBSCRIBER). Idioms are low level implementation patterns. Gamma et al. (1994) used two criteria, purpose and scope to classify 23 patterns into three categories: creational, structural and behavioral. Creational patterns are related to object creation (for example, ABSTRACT FACTORY, SINGLETON). Structural patterns are related to compositions or structures that are implemented in a software (for example, ADAPTER, COMPOSITE). Behavioral patterns are concerned with the assignment of responsibilities between objects or encapsulating behavior in an object and delegating requests to it (for example, INTERPRETER,

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