Patterns

A pattern can be defined as "that from which a copy is made" (Wiktionary.com)

Patterns are used as a model to build recurring solutions , for example, an architect creates a popular house plant, and every home a set of housing will be built using the same project.

There are a multitude of problems that have already been resolved, and we can use the successful experiences to solve our problems, reducing cost, time and designing the best possible solution.

A good practice of project is to create a documentation of lessons learned. This document can be compiled into a pattern, and the next time that the company is developing something can consult the catalog of patterns.

Exemplo

A widely used pattern of safety is the Bastion Host, this practice is used in the Internet environment to avoid the attack of crackers. Each server has a single application, for example, the e-mail Service should be on a dedicated server.

We can relate this pattern with the N-tier architecture, where an application to be placed in a production environment must have the pages in an HTTP server, the rules of business in an

application server, and database must be in a third server. With this we have the need for only one port open on each server.