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Download e-book for iPad: Advanced .NET remoting by Mario Szpuszta, Ingo Rammer

By Mario Szpuszta, Ingo Rammer

ISBN-10: 1430200111

ISBN-13: 9781430200116

ISBN-10: 1590594177

ISBN-13: 9781590594179

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Example text

Due to constraints of the real class, you will not be able to construct it directly, but instead will have to call a method on the factory, which creates a new instance and passes it to the client. Listing 3-6 shows you a fairly simple implementation of this design pattern. Listing 3-6. GetNewInstance(); } } } When bringing this pattern to remoting, you have to create a factory that’s running as a server-activated object (ideally a Singleton) that has a method returning a new instance of the “real class” (the CAO) to the client.

The complete server for this example can be seen in Listing 3-3. Listing 3-3. SingleCall); // the server will keep running until keypress. ReadLine(); } } } When the program is run, the output in Figure 3-1 will appear on the client. Figure 3-1. Client’s output for a SingleCall object What’s happening is exactly what you’d expect from the previous description—even though it might not be what you’d normally expect from an object-oriented application. The reason for the server returning a value of 0 after setting the value to 42 is that your client is talking to a completely different object.

GetObject(), upon which it places two calls to GetNewInstance() to acquire two different remote CAOs. Listing 3-9. ReadLine(); } } } When this sample is running, you see that the client behaves nearly identically to the previous example, but the second object’s value has been set using the object’s constructor, which is called via the factory (Figure 3-11). On the server a factory object is generated, and each new instance is created using the overloaded method GetNewInstance() (Figure 3-12). Figure 3-11.

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Advanced .NET remoting by Mario Szpuszta, Ingo Rammer

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