Figure 2-1 Accessing objects across contexts in Visual Studio .NET

Create QR Code in Visual Studio .NET Figure 2-1 Accessing objects across contexts
Figure 2-1 Accessing objects across contexts
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Object C has the same requirements for the context as object A If object A invokes a method with object C, object C is accessed directly without use of a proxy
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Comparing Agile Objects with Context-Bound Objects
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An agile object is the opposite of a context-bound object A context-bound object is bound to a context, whereas an agile object is independent of the context
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COM objects are always bound to a context Normal NET objects are agile Agile objects have the great advantage in that they can participate in the context of the caller With COM, for a component to participate in a COM+ context, it must be configured with COM+ This is not necessary with NET A simple NET class that is used by a configured component is running within the same context Agile objects make it possible to write the business and data access logic in simple NET classes, and the serviced component acts as a simple wrapper that uses the NET classes
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NET Remoting Contexts
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A NET object is bound to a context if its class derives from the base class ContextBoundObject To define the context for the derived class, attributes are used, and these attributes must derive (directly or indirectly) from Context-Attribute With NET 11, there is one documented attribute class in the NET Framework that has a base class ContextAttribute: SynchronizationAttribute The technology that is used with NET objects crossing contexts is NET remoting So the classes ContextBoundObject and SynchronizationAttribute can be found in the namespaceSystemRuntimeRemotingContexts Do not be afraid of performance issues within one application domain For cross-context communication inside one application domain, TCP or HTTP channels are not used; NET remoting uses an inter-application-domain channel instead, with which it is not necessary to leave the process
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NOTE: The NET Framework Has Two Synchronization Attributes
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Do not mix up the classes SynchronizationAttribute with the namespaces SystemRuntimeRemotingContexts and SystemEntepriseServices The attribute class from the first mentioned namespace will be used now, whereas the second one is discussed in 3, "Concurrency"
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What Is an Application Domain
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With Win32 applications, the application boundary is the process Each process has its own virtual memory, so that different processes cannot influence the outcome of each other NET has another security boundary: the application domain A single process can host multiple application domains, where objects from one domain cannot interact with objects from another domain directly For communication between objects in different application domains, NET remoting is used In such a scenario, an inter-application-domain channel is used for object communication across multiple application domains Application domains can be used as a security boundary between multiple applications inside the same process, but it is also a useful feature to dynamically load code that can be explicitly removed after use by unloading the application domain Application domains can be created programmatically, and there are also some NET hosting environments that create application domains by themselves One example is the ASPNET runtime, which uses multiple application domains to separate Web applications
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You can also use a NET context to get synchronized access to objects In the Console application sample shown inListing 2-1, class A derives from the class ContextBoundObject and is marked with the attribute [Synchronization], so that access to it is synchronized To demonstrate that access to an object of class A is synchronized, two threads are used to access the methodMethod1 In the Main method of class Test, a new object of type Test is instantiated, where an instance of the class A is created as a field Next, a new thread is started that invokes Method1 of the contained object, and from the main threadMethod1 is called a second time Usingt1Join, the main thread waits until thread t1 is completed So you can see easily what thread is doing the method; the threads are given names
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