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MBR class because it is accessed remotely as a singleton SAO, and its CreateInstance method is just a wrapper for the Activator.CreateInstance method.
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(In the ServerApp host application.) Public Class RemoteFactory Inherits MarshalByRefObject Implements RemoteInterfaces.IRemoteFactory This object will live forever. Public Overrides Function InitializeLifetimeService() As Object Return Nothing End Function A wrapper for Activator.CreateInstance method Function CreateInstance(ByVal assemblyName As String, ByVal typeName As String) _ As Object Implements RemoteInterfaces.IRemoteFactory.CreateInstance Unwrap the return value to return the real object, not the wrapper. Return Activator.CreateInstance(assemblyName, typeName).Unwrap End Function End Class
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The client application must register the RemoteFactory class as a remote object. It can perform the registration programmatically, as in this code:
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RemotingConfiguration.RegisterWellKnownServiceType(GetType(RemoteFactory), _ RemoteFactory.rem", WellKnownObjectMode.Singleton)
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Or the client can register the RemoteFactory class in the configuration file:
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<service> <wellknown type="ServerApp.RemoteFactory, ServerApp mode="Singleton objectUri="RemoteFactory.rem /> </service>
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Here s the code that runs on the client and uses the RemoteFactory class to create remote objects:
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(In the client application.)
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Get a reference to the remote factory class.
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(You can cache this reference for future calls.)
Dim url As String = tcp://localhost:50000/RemoteFactory.rem"
Dim factory As IRemoteFactory = DirectCast(Activator.GetObject( _ GetType(IRemoteFactory), url), IRemoteFactory) Create an instance of the remote Calculator as a CAO, cast to known interface. Dim calc As ICalculator = DirectCast(factory.CreateInstance( _ RemoteComponents", RemoteComponents.Calculator ), ICalculator) Use it.
Dim result As Double = calc.Add(10, 20)
You can easily extend the factory pattern to support constructors with arguments. Here s a better version of the IRemoteFactory interface with an overload of the Cre ateInstance method that takes one or more arguments to be passed to the constructor:
Part VII:
Advanced Topics
Public Interface IRemoteFactory Function CreateInstance(ByVal ByVal typeName As String) Function CreateInstance(ByVal ByVal typeName As String, End Interface
assemblyName As String, _ As Object assemblyName As String, _ ByVal ParamArray args() As Object) As Object
The RemoteFactory class implements the new method as follows:
Function CreateInstance(ByVal assemblyName As String, ByVal typeName As String, _ ByVal ParamArray args() As Object) As Object _ Implements RemoteInterfaces.IRemoteFactory.CreateInstance Load the assembly with given name Dim asm As [Assembly] = [Assembly].Load(assemblyName) Load the type, in case-insensitive mode. Dim ty As Type = asm.GetType(typeName, True, True) Call the constructor and pass all the arguments. Return ty.InvokeMember( ", BindingFlags.CreateInstance, Nothing, Nothing, _ args) End Function
Here s how the client can use the overloaded version of the CreateInstance method to pass a couple of arguments to the constructor of the remote class:
Dim calc As ICalculator = DirectCast(factory.CreateInstance( _ RemoteComponents", RemoteComponents.Calculator", 10, 20), ICalculator)
Using Shared Base Classes
The third technique for deploying metadata to clients without giving them the real assembly is actually a variation of the technique based on shared interfaces. Instead of having the remote class implement an interface, you derive it from a base abstract class that is defined in a separate DLL. Because all remotable classes must inherit from Mar shalByRefObject, this base class should also inherit from MarshalByRefObject. Here s an example of such a base class:
(In the RemoteInterfaces project.) Public MustInherit Class CalculatorBase Inherits MarshalByRefObject MustOverride Function Add(ByVal n1 As Double, ByVal n2 As Double) As Double MustOverride Function GetProcessID() As String End Class
You should slightly modify the source code of the Calculator class to have it inherit from CalculatorBase instead of MarshalByRefObject. The client application must use the Acti vator.GetObject method to instantiate an instance of the Calculator object and then cast the object reference to a variable of type CalculatorBase (instead of type ICalculator, as we did in the previous section). I leave these minor edits to you as an exercise.
32:
Remoting
The main advantage of the technique based on shared base classes is that the client now has a reference to an MBR object and can marshal it to applications living in other AppDomains.
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