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Introduction to Patterns

Introduction to Patterns - Introduction to Patterns They...

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Introduction to Patterns They are reusable design solutions to reoccurring problems. Modeled after Architectural design Patterns have been called the next best software improvement since object-oriented programming. Introduced in the book “Design Patterns: Elements of Reusable Object-Oriented Software by Gamma, Helm, Johnson and Vlissides [GoF95]
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Introduction to Patterns Modeled after the books: “A pattern language: Towns, Buildings, Construction” by architect Christopher Alexander. Examples: Symmetry is good Use half-round arches to support bridges and in doors. Same equivalent ideas exist in software design
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Parts of a Software Pattern Pattern Name Synopsis – One to two sentence description. Context – Describes the problem the pattern addresses. Forces – What leads to the solution proposed. Solution – Describes the general solution. Consequences – Implications good and bad. Implementation – What to consider when programming the solution Related Patterns
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Proxy Pattern Synopsis: Forces method calls to an object to occur through a proxy object. Context: A proxy may give the illusion that the object is local when it is in a different machine (remote-proxy). A proxy controls access (access proxy). Proxy acts as a logger object.
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