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Dim lease As ILease = DirectCast(calc.GetLifetimeService(), ILease)
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Dim lease2 As ILease = _
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DirectCast(RemotingServices.GetLifetimeService(calc), ILease)
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You can determine the state of the lease by querying its CurrentState property, which can be Null (the lease hasn t been initialized), Initial (the lease is created but not active yet), Active (the lease is active and hasn t expired yet), Renewing (the lease has expired and is attempting to find a sponsor), or Expired (the lease has expired). If the lease is active, you can use the CurrentLeaseTime property to determine how long the remote object will live. You can use the lease to perform two important operations: you can extend the lifetime of the remote object, and you can associate the lease with a sponsor. Extending the object lifetime is trivial:
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Renew the lease for one minute. lease.Renew(TimeSpan.FromMinutes(1))
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You ll see how to associate a sponsor with the lease in the next section.
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Defining a Sponsor
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A sponsor is an object that implements the ISponsor interface. This interface exposes only one method, Renewal, which is called by the lease manager when the lease of the remote object associated with the sponsor is about to expire. The Renewal method must return a TimeSpan value that specifies how long the object will live or return the value TimeSpan.Zero to refuse to extend the remote object s lifetime. A remote object
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Part VII:
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Advanced Topics
can be associated with multiple sponsors; in this case, the .NET runtime will call the Renewal method for each one of them.
Building the Sponsor Class
A sponsor object can run on the server machine or the client machine. The following sponsor class exposes a method named SetState, which lets clients affect the value of a private Active field. If this field is True, the sponsor renews the lease of the associated remote object; otherwise, the sponsor refuses to extend the object s lifetime:
Public Class CalculatorSponsor Inherits MarshalByRefObject Implements ISponsor This is an MBR object.
If True the sponsor renews the object s lease. Private Active As Boolean = True Let remote clients set the sponsor s active state. Public Sub SetState(ByVal active As Boolean) Me.Active = active End Sub Public Function Renewal(ByVal lease As ILease) As TimeSpan _ Implements ISponsor.Renewal If Active Then Return New TimeSpan(0, 1, 0) One minute Else Return TimeSpan.Zero End If End Function End Class
Implementing the ISponsor interface is what makes the CalculatorSponsor class work as a sponsor. In addition, sponsor classes usually derive from MarshalByRefObject to make them accessible to clients via remoting.
Using the Sponsor Class
The Calculator class registers its sponsor in its InitializeLifetimeService procedure by invoking the lease s Register method and makes the sponsor available to clients through its Sponsor read-only property:
Public Class Calculator Inherits MarshalByRefObject Public Overrides Function InitializeLifetimeService() As Object Dim lease As ILease = DirectCast(MyBase.InitializeLifetimeService, ILease) If lease.CurrentState = LeaseState.Initial Then lease.InitialLeaseTime = TimeSpan.FromSeconds(30) lease.RenewOnCallTime = TimeSpan.FromSeconds(10) lease.SponsorshipTimeout = TimeSpan.FromSeconds(20) m_Sponsor = New CalculatorSponsor lease.Register(m_Sponsor)
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End If Return lease End Function Private m_Sponsor As CalculatorSponsor A readonly property that exposes the object s sponsor. Public ReadOnly Property Sponsor() As CalculatorSponsor Get Return m_Sponsor End Get End Property End Class
Remoting
(You can disconnect a sponsor from a lease object by means of the lease s Unregister method.) The Calculator class exposes its sponsor object as a public read-only property, so cli ents can call the sponsor s SetState method to tell the sponsor I am alive :
(In the client application.) calc.Sponsor.SetState(True)
Improving the Sponsor Class
The CalculatorSponsor sponsor class doesn t correctly handle cases in which the client application crashes or a problem on the channel prevents the client from communicat ing with the server. In such situations, the Active field is never set to False, and the sponsor keeps the remote object alive forever. The simplest way to account for such cases is by remembering when the last call to the SetActive method occurred and checking this timestamp at the top of the Renewal method. Here s an improved implementation of the sponsor that uses this strategy:
Public Class CalculatorSponsorEx Inherits System.MarshalByRefObject Implements ISponsor If True the sponsor will renew the object s lease time. Private Active As Boolean = True Timestamp of last call to SetActive Private LastCallDateTime As Date = Now Public Sub SetState(ByVal active As Boolean) Me.Active = active Me.LastCallDateTime = Now End Sub Public Function Renewal(ByVal lease As ILease) As TimeSpan _ Implements ISponsor.Renewal Disable renewing if last call was more than 10 minutes ago. If Me.LastCallDateTime.AddMinutes(10) < Now Then Active = False If Active Then
Part VII:
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