Architectural patterns are used to define the architecture of a

Software system. Some of the patterns are as follows:

1. MVC: Model View Controller. This pattern is extensively

used in the architecture of Spring framework.

2. Publish-subscribe: This pattern is the basis of messaging

architecture. In this case messages are published to a

Topic. And subscribers subscribe to the topic of their

interests. Once the message is published to a topic in

which a Subscriber has an interest, the message is

consumed by the relevant subscriber.

3. Service Locator: This design pattern is used in a service

like JNDI to locate the available services. It uses as

central registry to maintain the list of services.

4. n-Tier: This is a generic design pattern to divide the

architecture in multiple tiers. E.g. there is 3-tier

architecture with Presentation layer, Application layer and

Data access layer. It is also called multi-layer design

pattern.

5. Data Access Object (DAO): This pattern is used in

providing access to database objects. The underlying

principle is that we can change the underlying database

system, without changing the business logic. Since

business logic talks to DAO object, there is no impact of

changing Database system on business logic.

6. Inversion of Control (IoC): This is the core of Dependency

Injection in Spring framework. We use this design pattern

to increase the modularity of an application. We keep the

objects loosely coupled with Dependency Injection.

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