API and Software Architecture

http://blog.csdn.net/horkychen/article/details/46612899

From the point of view of architecture design (so-called composition theory), software systems are modules and interfaces.

The module (Hierarchy/component) determines the division of labor, and the interface determines interaction.

An API is the definition of an interface. The modules do not need to be concerned with the implementation of other modules, only need to know how to collaborate.

This disperses the complexity into the various modules, making the overall system more controllable.

The nature of the API is to provide the interface to the module developer, which is for "people (Programmer)".

The core of the API's design task is to ensure that the user uses the interface at a lower cost and the driver module completes their business.

API and Software Architecture