mcs/class/referencesource/mscorlib/system/runtime/remoting/clientsponsor.cs

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 //+----------------------------------------------------------------------------
   7 //
   8 // File:        ClientSponsor.cs
   9 //
  10 // Contents:    Agent for keeping Server Object's lifetime in [....] with a client's lifetime
  11 //
  12 // History:     8/9/00   <EMAIL>[....]</EMAIL>        Created
  13 //
  14 //+----------------------------------------------------------------------------
  15
  16 namespace System.Runtime.Remoting.Lifetime
  17 {
  18     using System;
  19     using System.Collections;
  20     using System.Security.Permissions;
  21
  22     [System.Security.SecurityCritical]  // auto-generated_required
  23     [SecurityPermissionAttribute(SecurityAction.InheritanceDemand, Flags=SecurityPermissionFlag.Infrastructure)]
  24     [System.Runtime.InteropServices.ComVisible(true)]
  25     public class ClientSponsor : MarshalByRefObject, ISponsor
  26     {
  27         private Hashtable sponsorTable = new Hashtable(10);
  28         private TimeSpan m_renewalTime = TimeSpan.FromMinutes(2);
  29
  30         public ClientSponsor()
  31         {
  32         }
  33
  34         public ClientSponsor(TimeSpan renewalTime)
  35         {
  36             this.m_renewalTime = renewalTime;
  37         }
  38
  39         public TimeSpan RenewalTime
  40         {
  41             get{ return m_renewalTime;}
  42             set{ m_renewalTime = value;}
  43         }
  44
  45         [System.Security.SecurityCritical]  // auto-generated
  46         public bool Register(MarshalByRefObject obj)
  47         {
  48             BCLDebug.Trace("REMOTE", "ClientSponsor Register "+obj);
  49             ILease lease = (ILease)obj.GetLifetimeService();
  50             if (lease == null)
  51                 return false;
  52
  53             lease.Register(this);
  54             lock(sponsorTable)
  55             {
  56                 sponsorTable[obj] = lease;
  57             }
  58             return true;
  59         }
  60
  61         [System.Security.SecurityCritical]  // auto-generated
  62         public void Unregister(MarshalByRefObject obj)
  63         {
  64             BCLDebug.Trace("REMOTE", "ClientSponsor Unregister "+obj);
  65
  66             ILease lease = null;
  67             lock(sponsorTable)
  68             {
  69                 lease = (ILease)sponsorTable[obj];
  70             }
  71             if (lease != null)
  72                 lease.Unregister(this);
  73         }
  74
  75         // ISponsor method
  76         [System.Security.SecurityCritical]
  77         public TimeSpan Renewal(ILease lease)
  78         {
  79             BCLDebug.Trace("REMOTE", "ClientSponsor Renewal "+m_renewalTime);
  80             return m_renewalTime;
  81         }
  82
  83         [System.Security.SecurityCritical]  // auto-generated
  84         public void Close()
  85         {
  86             BCLDebug.Trace("REMOTE","ClientSponsor Close");
  87             lock(sponsorTable)
  88             {
  89                 IDictionaryEnumerator e = sponsorTable.GetEnumerator();
  90                 while(e.MoveNext())
  91                     ((ILease)e.Value).Unregister(this);
  92                 sponsorTable.Clear();
  93             }
  94         }
  95
  96         // Don't create a lease on the sponsor
  97         [System.Security.SecurityCritical]
  98         public override Object InitializeLifetimeService()
  99         {
 100             return null;
 101         }
 102
 103         [System.Security.SecuritySafeCritical] // finalizers should be treated as safe
 104         ~ClientSponsor()
 105         {
 106             BCLDebug.Trace("REMOTE","ClientSponsor Finalize");
 107         }
 108     }
 109 }