SPI和API的区别? [英] Difference between SPI and API?

问题描述

服务提供者接口 (SPI) 和 应用程序编程接口 (API)?

更具体地说，对于 Java 库，是什么使它们成为 API 和/或 SPI?

More specifically, for Java libraries, what makes them an API and/or SPI?

推荐答案

• API 是对您调用和使用以实现目标的类/接口/方法/...的描述，以及
• SPI 是对您扩展和实现以实现目标的类/接口/方法/...的描述.
• The API is the description of classes/interfaces/methods/... that you call and use to achieve a goal, and
• the SPI is the description of classes/interfaces/methods/... that you extend and implement to achieve a goal.

换句话说，API 会告诉您特定的类/方法为您做什么，而 SPI 会告诉您必须做什么才能符合要求.

Put differently, the API tells you what a specific class/method does for you, and the SPI tells you what you must do to conform.

通常 API 和 SPI 是分开的.例如，在 JDBC Driver class 是 SPI 的一部分:如果您只是想使用 JDBC，则不需要直接使用它，但是每个实现 JDBC 驱动程序的人都必须实现该类.

Usually API and SPI are separate. For example, in JDBC the Driver class is part of the SPI: If you simply want to use JDBC, you don't need to use it directly, but everyone who implements a JDBC driver must implement that class.

然而，有时它们会重叠.Connection 接口 是SPI 和 API:您在使用 JDBC 驱动程序时经常使用它，它需要由 JDBC 驱动程序的开发人员实现.

Sometimes they overlap, however. The Connection interface is both SPI and API: You use it routinely when you use a JDBC driver and it needs to be implemented by the developer of the JDBC driver.

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