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When publishing an object service to the remoting system, the programmer needs to be aware of the different activation and life cycle models that are available. There are two types of activation client activation and server activation both of which are handled by the System.Runtime.Remoting.RemotingConfiguration class.
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When a server publishes a service, the activation type defines how and when the object will be created, and how the life cycle of the object will be controlled. When a client registers for an activated service, the runtime is provided with information about how to create new proxies to represent the remote type. Calls to create instances of the registered type using the new keyword will be translated into the appropriate remoting operations.
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With client activation, a new instance of the published object is created on the server when the client instantiates a local reference. Each new instance on a client will lead to the creation of a new instance of the published object on the server, resulting in a one-to-one mapping between client proxies and instances of the server object. The client controls the life cycle of the server object. The server won't free the object until the client has finished with it or the client has exited. We would register the example service in the following way to support client activation:
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RemotingConfiguration.RegisterActivatedServiceType(typeof(Server));
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Clients register a mapping for the type as follows:
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RemotingConfiguration.RegisterActivatedClientType( typeof(Server), "http://localhost:20172");
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After the client has registered for the activated type, calls to new Server() will cause a new instance of the Server class to be created at the server and a proxy representing this instance to
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15. Remoting
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be created at the client. Once a type has been registered for remoting, local instances (those that will not be remoted) can no longer be created. Key points worth highlighting include the following:
The URL used by clients to register for a client-activated service doesn't contain the service name. Because the remote object is created in response to the new keyword, constructors with arguments can be used to instantiate remote objects.
Server Activation
The lifetime of a server-activated object is controlled directly by the server. When the client creates a new instance of the remote type, a proxy is created local to the client, but the instantiation of the remote type at the server is deferred until the client invokes a remote type member via the proxy. Key points worth highlighting include the following:
No network call is made when the remote type is instantiated. Only default constructors can be used because the construction of the remote object is deferred until the client has invoked a method and there are no means to pass constructor arguments.
There are two variations of server activation, which are defined in the System.Runtime.Remoting.WellKnownObjectMode enumeration: Singleton and SingleCall. Clients register for both kinds of server-activated type in the same way, as shown in the example at the start of this chapter:
RemotingConfiguration.RegisterWellKnownClientType( typeof(Server), "http://localhost:20172/CountServer");
The URL that is passed as an argument is a composite of a channel URL and the name of the service, specified in the server registration. Because the server controls the lifetime of the remote object, the client doesn't need to be aware of the server-activation model used.
Singleton
The first variant of server activation is Singleton, wherein the remoting system directs all remote method requests to a single instance of the activated class. The runtime guarantees zero or one instance of the published class will be in existence and that a single instance will be created and shared as required to service client requests. By default, a type instance used as a Singleton will be released if no clients make a request for 5 minutes. When this happens, there will be no instances of the published class until the next client invokes a method via a proxy, at which time a new instance will be created. Overriding the MarshalByRefObject.InitializeLifetimeService method to return null creates a Singleton that never expires. See the section on lifetime leases for more information. The original example (on page 343) demonstrated a Singleton type; the key statement from the Start class follows:
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