In software engineering, a design pattern is a general reusable solution to a commonly occurring problem within a given context in software design A design pattern is not a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations. Object-oriented design patterns typically show relationships and interactions between classes or objects, without specifying the final application classes or objects that are involved. Design patterns reside in the domain of modules and interconnections. At a higher level there are architectural patterns that are larger in scope, usually describing an overall pattern followed by an entire systemDesign patterns reside in the domain of modules and interconnections. At a higher level there are architectural patterns that are larger in scope, usually describing an overall pattern followed by an entire system
There are many types of design patterns:
>> Algorithm strategy patterns- addressing concerns related to high-level strategies describing how to exploit application characteristic on a computing platform.
>> Computational design patterns- addressing concerns related to key computation identification.
>> Execution patterns- that address concerns related to supporting application execution, including strategies in executing streams of tasks and building blocks to support task synchronization .
>>Implementation strategy patterns- addressing concerns related to implementing source code to support: >
2.the common data structures specific to parallel programming.
>>Structural design patterns- addressing concerns related to high-level structures of applications being develop
Domain-specific patterns Efforts have also been made to codify design patterns in particular domains, including use of existing design patterns as well as domain specific design patterns. Examples include user interface design patterns,information visualization, secure design, “secure usability”, Web design and business model design.