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CHAPTER 7 IN-DEPTH .NET REMOTING
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<Typename>_Lifetime <Typename>_RenewOnCallTime <Typename>_SponsorshipTimeout
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Initial TTL in milliseconds, or infinity Time to add to a method call in milliseconds Maximum time to react for sponsor objects in milliseconds
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To make this example behave the same as the previous one, you can use the following server-side configuration file: <configuration> <system.runtime.remoting> <application> <channels> <channel ref="http" port="5555" /> </channels> <lifetime leaseTime="10MS" renewOnCallTime="10MS" leaseManagerPollTime = "5MS" /> <service> <wellknown mode="Singleton" type="Server.DefaultLifeTimeSingleton, Server" objectUri="DefaultLifeTimeSingleton.soap" /> <wellknown mode="Singleton" type="Server.LongerLivingSingleton, Server" objectUri="LongerLivingSingleton.soap" /> <wellknown mode="Singleton" type="Server.InfinitelyLivingSingleton, Server" objectUri="InfinitelyLivingSingleton.soap" /> </service> </application> </system.runtime.remoting> <appSettings> <add key="Server.LongerLivingSingleton_LifeTime" value="5000" /> <add key="Server.LongerLivingSingleton_RenewOnCallTime" value="1000" /> <add key="Server.InfinitelyLivingSingleton_LifeTime" value="infinity" /> </appSettings> </configuration>
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When the new server is started (the client doesn t need any changes for this), you ll see the server-side output shown in Figure 7-3, which demonstrates that the changes were successful and the newly created server objects really read their lifetime settings from the configuration file.
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Figure 7-3. The configured server behaves as expected.
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Now that I ve covered the primary aspects of lifetime management in the .NET Remoting framework, I next show you the probably most confusing (but also most powerful) part of it: the sponsorship concept. Whenever a remote object is created, a sponsor can be registered with it. This sponsor is contacted by the LeaseManager as soon as the object s time to live is about to expire. It then has the option to return a TimeSpan, which will be the new TTL for the remote object. When a sponsor doesn t want to extend an object s lifetime, it can simply return TimeSpan.Zero. The sponsor object itself is a MarshalByRefObject that has to implement the interface ISponsor. The only other requisite for a sponsor is to be reachable by the .NET Remoting framework. It can therefore be located either on the remoting server itself, on another server application, or on the client application.
Caution Be aware, though, that when using client-side sponsors, the server has to be able to contact the
client directly (the client becomes a server itself in this case, as it s hosting the sponsor object). When you are dealing with clients behind firewalls, this approach will not work.
Implementing the ISponsor Interface
Sponsors have to implement the ISponsor interface, which is defined in System.Runtime. Remoting.Lifetime. It contains just one method, which will be called by the LeaseManager upon expiration of a lease s time to live. public interface ISponsor { TimeSpan Renewal(System.Runtime.Remoting.Lifetime.ILease lease) }
CHAPTER 7 IN-DEPTH .NET REMOTING
The sponsor has to return a TimeSpan that specifies the new TTL for the object. If the sponsor decides not to increase the LeaseTime, it can return TimeSpan.Zero. A basic sponsor can look like the following: public class MySponsor: MarshalByRefObject, ISponsor { private bool NeedsRenewal() { // check some internal conditions return true; } public TimeSpan Renewal(System.Runtime.Remoting.Lifetime.ILease lease) { if (NeedsRenewal()) { return TimeSpan.FromMinutes(5); } else { return TimeSpan.Zero; } } }
Using Client-Side Sponsors
When using client-side sponsors, you are basically mimicking the DCOM behavior of pinging, although you have more control over the process here. After acquiring the reference to a remote object (you ll do this mostly for CAOs, as for SAOs the lifetime should normally be managed only by the server), you contact its lifetime service and register the sponsor with it. You can get an object s LifetimeService, which will be an ILease object, using the following line of code: ILease lease = (ILease) obj.GetLifetimeService();
Note If you used an interface-based remoting approach, you might first have to cast your proxy object to
MarshalByRefObject before you can call GetLifetimeService(). The preceding line would in this case read ILease lease = (ILease) ((MarshalByRefObject) obj).GetLifetimeService();.
The ILease interface supports a Register() method to add another sponsor for the underlying object. When you want to hold a reference to an object for an unspecified amount of time (maybe while your client application is waiting for some user input), you can register a client-side sponsor with it and increase the TTL on demand.
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