初识用.NET Remoting来开发分布式应用
一..NET Remoting简介:
.NET Remoting从某种意义上讲是DCOM的替代品。ASP.NET Web服务十分有用,但是这项技术在企业内联网的解决方案中,对于某些业务请求来说并不快,也没有足够的灵活性,而且,ASP.NET Web服务需要有运行时的支持。使用.NET Remoting技术后,可以将Web服务提供给世界上的任何地方。而且可以在所有的应用程序类型中运行Web服务。
二..NET Remoting 的基本原理:
体系结构图如下:
三.几个重要的概念:
1.远程对象:
远程对象类是从MarshalByRefObject类中派生的。跨越应用程序域调用这个类需要使用代理。.NET Remoting支持两种类型的远程对象:知名的(Well-known)远程对象和客户激活(Client-activated)远程对象。远程对象其实包括两层含义:
操作远程对象:对象运行在远程,客户段向他发送消息;
传递远程对象:将远程对象拿到本地,或者将本地对象发送过去,对副本进行操作。
2.激活:
使用new运算符可以激活远程对象。还有其它一些方式也可以激活远程对象,在以后的随笔里面我会介绍。
3.通道:
一个远程对象使用通道发送和接收消息。服务器选择一个通道来监听请求,客户端选择通道来和服务器通讯。Remoting提供了内置的通道:TCP通道和HTTP通道,我们也可以编写自己的通道。
4.编组:
数组通过应用程序域被传递的过程称为编组。将变量作为远程对象的参数来发送时,这个变量必须被转换,以便能够通过应用程序域发送该变量。
5.监听:
使用监听,能够将某些功能置入到方法调用链中。如果调用某个对象的方法,监听层便能够捕获调用来转换方法调用,或是完成某些日志记录。.NET Remoting调用链的每一部分都是用监听。
四.开发Remoting三步走:
开发.NET Remoting分三步走,在这里以一个简单的例子来说明。
1.创建远程对象:
继承System.MarshalByRefObject
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2.创建宿主应用程序:
注册通道
注册服务器激活的远程对象
运行宿主程序
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3.建立客户端程序:
注册通道
根据URL得到对象代理
使用代理调用远程对象
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结束语:初识用.NET Remoting来开发分布式应用就到这里了,有时间我会就.NET Remoting技术写成系列文章。包括基于租约的生存期,编组,异步远程调用等等。
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