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Some organizations use internal firewall technology that makes the use of DCOM, and thus the Enterprise Services channel, problematic. The Enterprise Services channel uses DCOM as its network transport and while it is technically possible to make DCOM work through a firewall, most organizations opt for a more firewall-friendly technology. Both remoting and Web Services can use HTTP over port 80, and thus they are firewall-friendly by default. Even when using SSL, most firewalls allow that traffic as well. When hosted in a custom host like a Windows Service, remoting can be configured to use raw TCP sockets over arbitrary ports. In that case, remoting would require extra firewall configuration to allow that traffic to flow. Again, I recommend hosting remoting in IIS, in which case this is not an issue.
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There are two aspects to deployment: client and server. Simple client deployment typically means that there is no need to register components, thus providing support for XCOPY deployment and ClickOnce. Server deployment is never simple, but the goal is for deployment to be as easy and straightforward as possible. When it comes to client deployment, both remoting and Web Services are trivial. Neither requires special components or registration of any sort. They merely require that the client s configuration specify the data portal channel to be used, including the URL of the application server. Enterprise Services is a bit more complex, because the COM+ server application must be registered on the client. While this merely means running an extra msi installer on the client workstation or client web server, that extra step definitely complicates deployment of client applications. On the server, all three technologies are relatively comparable. In the case of remoting (hosted in IIS) and Web Services, you need to set up and configure a virtual root in IIS. With Enterprise Services, you need to set up and configure a COM+ Application using the server s Component Services tool. Of course, if you choose to implement a custom host for remoting, it is up to you to ensure that server deployment and management is straightforward.
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Finally, there s the ease of implementation. As I mentioned earlier, neither your UI nor business object code varies depending on the data portal channel, so what I m talking about here is the ease with which you implement the data portal host to run on the application server.
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CHAPTER 12 s IMPLEMENTING REMOTE DATA PORTAL HOSTS
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Remoting and Web Services have the edge here, because virtually all their implementation was done in 4. With remoting, all you need to do is add some lines to web.config on the server, while with Web Services, you need to create a one-line asmx file. Either approach is trivial. Enterprise Services requires more work, because COM+ has no concept of virtual roots. If you want to set up a COM+ Application on the server with a unique name, you need a specific Enterprise Services component to put into that COM+ Application. In other words, you can t put Csla.dll into COM+ multiple times and be able to configure each instance separately; something that you can do with virtual roots in IIS. Due to this, you ll need to do some simple coding to create a unique Enterprise Services assembly for your particular application. Again, most of the work was done in 4, but this is an extra bit of work you need to do once for each business application you create (if you want to create an Enterprise Services data portal host). In the final analysis, it is up to you which data portal channel technology to choose. The important thing to remember is that you can switch from one to the other without breaking your UI or business object code. This means you can try one channel and switch to another later if you determine it would better fit your needs. This flexibility will become particularly important once Microsoft releases WCF, since it should provide you with a largely transparent migration path to that technology.
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