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A NET client can access serviced components directly only if the client is running in the same process (ie, if the Enterprise Services application is configured as a library application) In such a scenario, COM interoperability does not happen at all The method parameters are directly passed to the method of the serviced component without the need to marshal and unmarshal them with COM interop This is different when the Enterprise Services application is configured as a server application, or the application must be accessed from [1] a different system across the network In such a case, you can either use DCOM or SOAP services to access the serviced components DCOM is the protocol with a long history that was used as a network protocol between a COM client and a COM server DCOM is still a good protocol when it comes to NET clients accessing serviced components With COM+ 15, you have another option to access the serviced component across the network: You can enable SOAP services just by checking a check box SOAP services are based on NET remoting However, this protocol does not have as many capabilities as DCOM Another wayand for many scenarios the best optionto access serviced components across the network is by adding a fa ade to the serviced components Web services can be a client to the serviced components that acts as the interface to the client application Specifically, this chapter covers the following topics:
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DCOM, which is still a viable option for accessing serviced components because it currently offers more features than SOAP services SOAP services, which uses the flexibility of NET remoting as a transport to access serviced components across the network Web services (in this chapter implemented with ASPNET), a very viable option to access the serviced component from a Web server
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DCOM
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[2] DCOM is the protocol used to access legacy COM objects across process and system boundaries Although in new applications COM programming is replaced in many areas with NET technologies, DCOM is still a viable option to access serviced components, because it [3] is very fast and easy to use and the only protocol that flows COM+ context [4] However, DCOM is not as flexible as NET remoting This section shows how you can use DCOM to access serviced components; but first you need to know about the following:
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DCOM transports Creating and using application proxies Installing the application proxy
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DCOM Transport Protocols
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DCOM supports different transport protocolssuch as TCP/IP, UDP, and IPX You can configure the transport protocol that you want to use for DCOM communication, but obviously both the client and the server must have the same protocol configured For performance reasons, pay attention to the order of configured protocols Nowadays the protocol for DCOM is likely an easy choice: TCP/IP In the early days of DCOM, the Microsoft protocol NetBEUI or Novell IPX would have been important Although NetBEUI was still available with the DCOM protocol options with Windows 2000, it is no longer available with Windows Server 2003 and Windows XP [5] You can configure the DCOM transport protocol to be used with your serviced components with the Component Services Explorer To open the dialog box shown in Figure 5-1, select My Computer in the tree view, and then choose Action, Properties, Default Protocols You can see that on my system, Connection-Oriented TCP/IP is the only configured protocol Other available protocols that you can add are SPX, Datagram UDP/IP, and Tunneling TCP/IP The order of protocols in this dialog box defines the order in which a connection is tried If a connection with the first protocol succeeds, the second one is not used To reduce the connection time, a connection with the first protocol in the list should succeed
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