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Performance Security Host technology Firewall-friendliness Ease of deployment Ease of implementation
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Notice that neither open standards nor interop are listed here. This is because the data portal is serializing your business objects across the network, so the only way that the data on the other end of the wire can be understood is if the data is deserialized back into your business classes. The data portal is an n-tier client/server concept, and neither interop nor XML standards on the network matter within this context.
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If interop and readable XML are requirements for your application, you should use the concepts discussed in 11 to create a web service interface on top of your business objects.
However, for n-tier client/server applications, the factors listed in Table 12-1 are typically very important. Let s discuss each factor in turn.
Performance
When it comes to performance, you can find a wealth of opinions and a number of conflicting studies on the Web telling you what s faster and slower. In general terms, though, you ll find that both remoting and Web Services are of relatively comparable performance. This makes sense because they are both web-based technologies and share a lot of common underpinnings within .NET. The reason I give remoting slightly higher marks than Web Services is because remoting transfers the serialized object data in a binary format that is substantially smaller than the Base64 encoded format used by Web Services.
CHAPTER 12 s IMPLEMENTING REMOTE DATA PORTAL HOSTS
s You may be able to employ compression technologies when using Web Services to get similar or even Tip smaller chunks of data on the network. Of course, that would mean an increase in CPU use on both client and server, so you need to test to see if this makes sense for you.
Perhaps more important, you ll find that Enterprise Services is substantially faster than either remoting or Web Services. Of course, when it comes to performance, environmental factors make a big difference. What is your network topology Your network load Your server load Due to these variables, you should do your own testing to determine which channel technology provides you with the best performance overall.
Security
The term security spans a wide area. In this case, I am talking about security in terms of knowing that the data came from the client, and whether the data is encrypted as it moves across the network between the client and server. Both remoting and Web Services can use SSL (Secure Sockets Layer) communication over HTTP , which is typically the easiest and best way to provide a secure communication channel for these technologies. If you are using the TCP channel and implement a custom host application, remoting also offers the ability to do its own encryption. This option is not available with the HTTP channel, so in that case you should use SSL. Enterprise Services offers various levels of data encryption on the wire, and so has the most flexibility and capabilities in this area. Additionally, enabling secure communication using Enterprise Services is often easier than configuring SSL on a web server. If you are running in a Windows domain, just set your COM+ Application properties as shown in Figure 12-1. This is often far easier than the process required to enable SSL on a web server.
Figure 12-1. Using packet privacy in Enterprise Services
CHAPTER 12 s IMPLEMENTING REMOTE DATA PORTAL HOSTS
Host Technology
The host technology used by an application server can weigh heavily in some server environments. Some organizations disallow the use of IIS on certain types of servers. Both remoting and Web Services can be hosted in IIS; technically within ASP.NET on IIS. This is an ideal configuration for remoting, since it gains all the benefits of running within IIS and ASP.NET. And it is the only real option for Web Services. Remoting can also be hosted in a custom application of your design. Typically this would be a Windows Service. I don t recommend this course of action, because you would need to duplicate a large percentage of IIS to achieve comparable levels of manageability, security, runtime monitoring, and so forth. In most cases, it is far preferable to using remoting within the context of IIS and ASP .NET. Enterprise Services can only be hosted in COM+, because Enterprise Services is really just a wrapper around the existing COM+ services. This means that your server does not need IIS to host the data portal in Enterprise Services.
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