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CHAPTER 2 .NET REMOTING BASICS
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Most remoting systems like DCE/RPC, RMI, and J2EE demand a manual creation of so-called proxy/stub objects. The proxy encapsulates the connection to the remote object on the client and forwards calls to a stub object on the server, which in turn passes them on to the real object. In most of these environments (at least in CORBA, DCE/RPC, and DCOM) the source code for generating these objects has to be written in an abstract Interface Definition Language and precompiled to generate implementation headers for a certain programming language. In comparison to this traditional approach, .NET Remoting uses a generic proxy for all kinds of remote objects. This is possible because .NET is the first framework that has been designed with remoting in mind; on other platforms these capabilities have been retrofitted and therefore have to be integrated into the given architecture and programming model. Such ease of remoting poses the potential problem of your using an incorrect design.1 This book will help you to make the right architectural decisions. For example, even though you don t have to write any interface definitions in IDL, you still should separate interface from implementation; you can, however, write both in the same language in any .NET programming language. .NET Remoting provides several different ways of defining those interfaces, as discussed in the following sections.
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In this case, the server-side object s implementation exists on the client as well. Only during instantiation is it determined whether a local object or an object on the remote server will be created. This method allows for a semitransparent switch between invoking the local implementation (for example, when working offline) and invoking server-side objects (for example, to make calculations on better-performing servers when connected to the network). When using this method with conventional distributed applications that don t need to work in a disconnected scenario, you need to use a lot of care, because it poses some risks due to easy-to-miss programming and configuration errors. When the object is mistakenly instantiated as a local object on the client and passed to the server (as a method s parameter, for example) you might run into serious troubles, ranging from InvalidCastExceptions to code that works in the development environment but doesn t work in the production environment because of firewall restrictions. In this case the client has in reality become the server, and further calls to the object will pass from the server to your clients.
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Shared Interfaces or Base Objects
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When creating a distributed application, you define the base classes or interfaces to your remote objects in a separated assembly. This assembly is used on both the client and the server. The real implementation is placed only on the server and is a class that extends the base class or implements the interface. The advantage is that you have a distinct boundary between the server and the client application, but you have to build this intermediate assembly as well. Good object-oriented practices nevertheless recommend this approach!
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1. This is partly the same as it was in Visual Basic 6. VB 6 allowed you to create applications without a lot of up-front design work. This often led to applications that were hardly maintainable in the long run.
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CHAPTER 2 .NET REMOTING BASICS
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Note This is the recommended way of creating .NET Remoting applications.
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Generated Metadata Assembly
This approach seems to be the most elegant one at first glance. You develop the server in the same way as when using the shared assemblies method. Instead of really sharing the DLL or EXE, you later extract the necessary metadata, which contains the interface information, using SoapSuds. SoapSuds will either need the URL to a running server or the name of an assembly as a parameter, and will extract the necessary information (interfaces, base classes, objects passed by value, and so on). It will put this data into a new assembly, which can be referenced from the client application. You can then continue to work as if you d separated your interfaces right from the beginning.
Caution Even though using SoapSuds might seem intriguing when you look at it for the first time, experience shows otherwise. Nowadays, Microsoft recommends using this tool in only very specific cases as detailed in 9.
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