Over the past couple of decades, software engineers have recognized the value of

Question

Over the past couple of decades, software engineers have recognized the value of moving up from code reuse to the reuse of higher-level items. Design patterns have been recognized as a valuable unit for reuse, and this has led to the development of a great number of patterns over the years. With so many design patterns being recognized and developed, finding the right pattern to use or customize can be a difficult task without some method for organizing them. Architecture modeling typically establishes a design pattern hierarchy by grouping design patterns and associating them to the related architectural pattern. A similar hierarchy applies to architectural patterns. By grouping and associating patterns in such a way, modelers can create a lattice of patterns referred to as a pattern hierarchy. To put this concept to work, review the “Catalog of Patterns of Enterprise Application Architecture” (or EAA Catalog). This catalog of patterns is organized functionally. Familiarize yourself with the differences between architectural styles, architectural patterns, and design patterns. In this Assignment, write a 1- to 3-page paper that addresses the following: Create a pattern hierarchy that meaningfully organizes the EAA Catalog of patterns. Include at least one pattern from each category in the catalog. Explain the organizing principles you have employed in your pattern hierarchy. As mentioned above, the EAA Catalog is organized functionally. You need to use a different organizing principle.

Reference Material http://martinfowler.com/eaaCatalog/

Explanation / Answer

There are many architectural issues in building enterprise applications. In building software a great believer in iterative development. At the heart of iterative development is the notion that you should deliver software as soon as you have something useful to the user, even if it's not complete. Although there are many differences between writing a book and writing software, this notion is one that I think the two share. incomplete but (I trust) useful compendium of advice on enterprise application architecture. The primary topics are:

1 Layering of enterprise applications
2 Structuring domain (business) logic
3 Structuring a Web user interface
4 Linking in-memory modules (particularly objects) to a relational database
5 Handling session state in stateless environments
Principles of distribution.

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