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Server-activated components A server-activated component is created by the server Two possible modes exist here Singleton and SingleCall See the description of activation in this list for more information Channels A channel is a conduit for the actual transmission of the remote calls over the wire HTTPChannel Remote calls are transmitted over the HTTP protocol HTTPChannel is part of the NET Framework TCPChannel Remote calls are transmitted over the TCP protocol TCPChannel is part of the NET Framework Formatters A formatter is responsible for transforming the data intended for the remote object into the transmission format, and vice versa a formatter is required to transform the response from the server into the transmission format SOAP formatter A SOAP formatter transforms the remote data using SOAP (Simple Object Access Protocol) The SOAP formatter is included as part of the NET Framework Binary formatter A binary formatter transforms the remote data via a binary data stream The binary formatter is part of the NET Framework Sink chains The combination of a channel and a formatter is a sink chain Messages pass from one sink chain to another in the remoting architecture Remoting host A remoting host provides a runtime environment on the remoting server for the remote object Examples include IIS (Internet Information Server) and Windows Forms Almost any NET executable can serve as a remoting host Stateful vs stateless State is the data that an object contains If a remote object maintains state between method calls, it is called a stateful object This means that if multiple clients are accessing the same object, they will be able to see the changes that another client object has made to the server object s state If a remote object does not keep state between method calls (if there is no data held), the object is called stateless Stateless objects can be used easily between multiple clients because there is no fear that data created by one client will be destroyed by another client (since there is no data stored) Activation When a server object s methods are requested, this is called activation, and it can be done through server-object instantiation There are two ways in which a remoting object can be activated The first is by using SingleCall mode, which means that a new instance of the server object is created with every client call The second is by using Singleton mode, which means that a single instance of the server object can serve several clients The third method of activation is called client-activated object (CAO) In this case, the client application creates an exclusive instance of the object The object can then maintain state without any other client object making changes to it
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27: NET Remoting
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If your head is spinning right now, don t worry We will cover each of these concepts in detail in this chapter The preceding list is a quick reference for you when you go to write the exam These terms and their meanings must be at the tip of your tongue if you are to be successful on the exam
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Understanding the architecture of NET Remoting will help you when working with this technology Remember that a lot of what happens is abstracted from the developer in an effort to reduce the amount of coding work and make better use of development time This is true of any remote object architecture, whether it is NET Remoting, Web Services, Enterprise Java Beans, or any other development environment The goal of these architectures is to reduce the amount of time that you, the developer, have to spend working on the remote and networking issues Your development time should be spent on making the objects as flexible as possible These objects should encapsulate the business logic, rather than the networking logic Having said all that, you should be aware of the background work that is done for you in order to fully appreciate the significance of this technology We will start off with a simplistic overview of NET Remoting Figure 27-1 illustrates the overall process Let s examine all the parts of Figure 27-1 (In the coming sections, we will look at each in detail) Two separate application domains are shown in Figure 27-1: the server environment, where the remote object will be created, and the client environment, which will make the call to the remote object Under normal circumstances (without remoting), these objects are unable to send messages to each other Here are the steps involved in remote calls: PART V 1 The client object creates an instance of the server object 2 The remoting system creates a proxy object that represents the server object, and returns a reference to the proxy to the client 3 The client makes a method call to the server object 4 The remoting system that envelops the client will intercept the call, check the request for type safety, and send the request over a channel to the server 5 A channel on the server side listens for such calls and picks up the request
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