Layered Pattern

最新推荐文章于 2025-02-19 20:53:49 发布

原创最新推荐文章于 2025-02-19 20:53:49 发布 · 726 阅读

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#dependencies #components #access #deployment #layer #domain

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本文介绍了一种通过分层模式组织业务解决方案的方法，旨在重用业务逻辑、提高部署灵活性并节省昂贵资源连接。采用三层架构——展示层、业务逻辑层及数据访问层，实现了组件间的解耦合，并确保了数据库连接的有效管理。

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分层模式的用途首先是将复杂的问题进行分解. 其次是允许复用Business logic以及conserve valuable connections to expensive resources such as databases。

Three Layered Application

Context

You are building a business solution using layers to organize your application.

Problem

How do you organize your application to reuse business logic, provide deployment flexibility and conserve valuable resource connection?

Solution

Create three layers:presentation, business logic(domain), and data access. Place all components responsible for the view in the presentation layer. Encapsulate all business logic in domain layer components that implement well-known component interfaces.Locate all database-related code, including database client access and utility components, in the data access layer. Require the data access layer to be responsible for connection pooling when accessing resources. Make sure you eliminate the dependencies between the business layer and the presentation layer or manage the dependencies here using the Observer pattern.