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.NET Remoting Technology Projection In the code you can see how the client retrieves a PatientManager object in the first section using the Activator. The second section retrieves the factory using the same approach (because it is also stateless) and the third section uses the factory to obtain an instance of IPricing. Up to this point there is no difference between CLIENT-DEPENDENT INSTANCES and the other activation modes. It gets interesting, however, when we consider how long an instance actually lives before it is considered invalid by the framework. The following discussion is also important for LAZY ACQUISITION and STATIC INSTANCES, because they might also need to be removed once their lease expires. This is typically not what is intended, so they have to be made to live forever. Implementing lease management .NET Remoting uses the LEASING pattern. A lease is basically a temporarily limited permission for a remote object instance to exist and to be accessed by clients. Each instance has a counter (called Time To Live, or TTL) that determines how long the instance is allowed to live. .NET uses the following policies to determine the lifetime of an instance: An instance has an InitialLeaseTime that determines how long the instance lives initially after creation. On each method invocation, the remaining TTL is set to the specified RenewalOnCallTime. When the instance s TTL reaches zero (that is, when no method has been invoked for the remaining TTL) then a sponsor will be contacted by the LEASING manager, if one is registered for the respective instance. The sponsor can increase the TTL to make sure the instance does not die, even though the lease had expired. If the sponsor does not increase the TTL, or if no sponsor is registered for the instance, the instance is discarded by the Remoting framework and eventually garbage-collected. The default values for the initial lease time is five minutes, and the renewal on call time defaults to two minutes. For many application scenarios this is not suitable, and shorter or longer periods might be appropriate. It is easily possible to change these settings either on an application-wide level, on a remote object type level, or per remote object instance. Let s look at changing the LEASING settings for a particular remote object type.
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The Pricing implementation could look something like the following:
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namespace PatientManagementServer { public class Pricing : MarshalByRefObject, IPricing { private Patient patient = null; private ArrayList keys = new ArrayList(); public Pricing( Patient _patient ) { patient = _patient; } public void addKey( DiagonsticKey key ) { keys.Add( key ); } public double getTotalPrice() { return keys.Count; } public Patient getPatient() { return patient; }
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This implementation uses the system-wide defaults. To change these for this particular remote object type, we have to override the InitializeLifetimeService operation in the following way:
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namespace PatientManagementServer { public class Pricing : MarshalByRefObject, IPricing { // the other operations as before public override object InitializeLifetimeService() { ILease lease = (ILease)base.InitializeLifetimeService(); if ( lease.CurrentState == LeaseState.Initial ) { lease.InitialLeaseTime = TimeSpan.FromSeconds(10*60); lease.RenewOnCallTime = TimeSpan.FromSeconds(5*60); } return lease; }
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.NET Remoting Technology Projection As you can see, we set the initial lease time to 10 minutes and the renewal interval at each method call to 5 minutes. If you want to make sure your instance lives forever (that is, until program termination), you just return null in InitializeLifetimeService. This is typically done in case of STATIC INSTANCES:
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public class PreconfiguredEx : MarshalByRefObject, IPricing { public override object InitializeLifetimeService() { return null; } }
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When a client accesses an instance that is no longer accessible because its lease has timed out, the client receives a RemotingException:
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Unhandled Exception: System.Runtime.Remoting.RemotingException: Object </6ddffc7/1.rem> has been disconnected or does not exist at the server.
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The last hope sponsors We mentioned the concept of a sponsor before. Sponsors are the last hope for a remote object if its lease expires. The lease manager contacts the sponsor and asks it whether it should renew the lease for the instance that is ready to die. Sponsors must implement the ISponsor interface, which is very simple:
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public interface ISponsor { TimeSpan Renewal( Ilease lease ); }
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The following is a simple example of a sponsor that allows its associated instance an extended lifetime of 20 minutes:
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namespace RemotingTestApp { public class Sponsor : ISponsor { public TimeSpan Renewal( ILease lease ) { return TimeSpan.FromMinutes(20); } } }
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