create and print barcode c# Changing Lease Settings for the Server Application in .NET framework

Printing Quick Response Code in .NET framework Changing Lease Settings for the Server Application

The easiest way to change the default timeout settings used by the host application is by adding a <lifetime> tag in the application s configuration file:

<configuration> <system.runtime.remoting> <application> <lifetime leaseManagerPollTime="30s sponsorshipTimeout="1m leaseTime="1m renewOnCallTime="20s /> </application> </system.runtime.remoting> </configuration>

The default unit for time values is seconds, but you can specify other time units by using a character suffix: D for days, H for hours, M for minutes, S for seconds, or MS for milliseconds.

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The leaseManagerPollTime attribute is the interval at which the lease manager checks the lease time of a remote object (the default is 10 seconds); the sponsorshipTimeout attribute is the amount of time the lease manager is willing to wait when it contacts a sponsor (the default is 2 minutes); the leaseTime is the initial lease time granted to a remote object (the default is 5 minutes); the renewOnCallTime attribute specifies the minimum amount of time granted to a remote object after a remote client invokes one of its methods (the default is 2 minutes). The renewOnCallTime value is used only if it is higher than the value of the lease time when a method is invoked. For example, let s say that the server publishes an object using the default values of 5 minutes for leaseTime and 2 minutes for newOnCallTime. If the first method call arrives after 1 minute, the lease time has become 4 minutes, and therefore the renewOnCallTime value is ignored. If the next call from a client arrives after 3 minutes, the lease time has become 1 minute, but the renewOnCallTime setting brings it up to 2 minutes. If these 2 minutes elapse without the client making a method call, the object expires, and the .NET runtime throws a RemotingException (whose message reads Requested service not found) the next time the client attempts to use the object reference. (Notice that an expired object isn t necessarily physically destroyed, because it might be kept alive by local references in the host application.) Instead of using a configuration file, the host application can adjust lease settings by assigning a TimeSpan value to shared properties of the LifetimeServices class. For exam ple, this code has the same effect as the <lifetime> tag in the previous configuration file:

You can create a TimeSpan value in many ways. LifetimeServices.LeaseManagerPollTime = TimeSpan.FromSeconds (30) LifetimeServices.SponsorshipTimeout = TimeSpan.FromMinutes (1) Lifetimeservices.LeaseTime = new TimeSpan(0,0,10) LifetimeServices.RenewOnCallTime = New TimeSpan(0, 0, 5)

You can control the lease time of a specific type of remote object as opposed to all the objects exposed by the host application by overriding the InitializeLifetimeService method that all MBR classes inherit from MarshalByRefObject. This method is expected to return the lease associated with the MBR object. You can change the properties of the lease object before returning it to the .NET runtime, but you can do so only the first time this method is called:

Public Class Calculator Inherits MarshalByRefObject Public Overrides Function InitializeLifetimeService() As Object Get a reference to the lease object returned by the base class. Dim lease As ILease = DirectCast(MyBase.InitializeLifetimeService, ILease) Set the lease properties, but only if initializing. If lease.CurrentState = LeaseState.Initial Then

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lease.InitialLeaseTime = TimeSpan.FromSeconds(30) lease.RenewOnCallTime = TimeSpan.FromSeconds(10) lease.SponsorshipTimeout = TimeSpan.FromSeconds(20) End If Return lease End Function End Class

As a special case, you can return Nothing if you want to keep the remote object alive forever, which corresponds to an infinite lease time:

Public Overrides Function InitializeLifetimeService() As Object Return Nothing (Not really necessary) End Function

Code running in the host application can retrieve the lease associated with a remotable object either by invoking the object s GetLifetimeService method (which all MBR objects inherit from MarshalByRefObject) or by passing the object to the RemotingSer vices.GetLifetimeService shared method: