中间件

中间件_第1张图片
中间件(Middleware)是处于操作系统和应用程序之间的软件,也有人认为它应该属于操作系统中的一部分。人们在使用中间件时,往往是一组中间件集成在一起,构成一个平台(包括开发平台和运行平台),但在这组中间件中必需要有一个通信中间件,即中间件=平台+通信,这个定义也限定了只有用于分布式系统中才能称为中间件,同时还可以把它与支撑软件和实用软件区分开来。

消息中间件(MOM:Message-Oriented Middleware)

数据中间件(Database Middleware)

远程过程调用中间件(RPC:Remote Process Call)

对象请求代理中间件(ORB:Object Request Broker)

事务处理中间件(TP Monitor:Transaction Process Monitor)

J2EE中间件

分布式软件系统:

1.不同的模块运行在不同的物理位置

2.并行处理同一个请求

分布式对象,实际上是软件构件:

1、面向对象

2、对象之间的交互,通过消息交换。(对象方法的调用)

3、语言的无关性

4、可插入性强、封装的更彻底,不关注源代码的处理

分布式系统中数据交换只能是流数据(网络上进行传输的数据,串行化数据 )。

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