SponsorHelper.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / Utility / SponsorHelper.cs / 1305600 / SponsorHelper.cs
                        

                        
                            using System; 
using System.Diagnostics;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Lifetime;
using System.Security; 
using System.Security.Permissions;
 
namespace MS.Internal.Utility 
{
    #region SponsorHelper Class 
    /// 
    /// We either mark the Sponsor as MarshalByRef or make it serializable.
    /// If we make it MarshalByRef, then this sponsor which is used to control
    /// the lifetime of a MBR object in turn needs to have another sponsor OR 
    /// the sponsor can mark itself to remain alive for the life of the AppDomain
    /// by overriding InitializeLifetimeService and returning null OR the object 
    /// can be marked as Serializeable instead of MBR in which case it is marshaled 
    /// by value to the client appdomain and will not have the state of the host
    /// appdomain to make renewal decisions. In our case we don't have any state so 
    /// its easier and better perf-wise to mark it Serializable.
    /// 
    [Serializable]
    internal class SponsorHelper : ISponsor 
    {
        #region Private Data 
        private ILease _lease; 
        private TimeSpan _timespan;
        #endregion Private Data 

        #region Constructor
        internal SponsorHelper(ILease lease, TimeSpan timespan)
        { 
            Debug.Assert(lease != null && timespan != null, "Lease and TimeSpan arguments cannot be null");
            _lease = lease; 
            _timespan = timespan; 
        }
        #endregion Constructor 

        #region ISponsor Interface
        TimeSpan ISponsor.Renewal(ILease lease)
        { 
            if (lease == null)
            { 
                throw new ArgumentNullException("lease"); 
            }
 
            return _timespan;
        }
        #endregion ISponsor Interface
 
        #region Internal Methods
        ///  
        /// Critical - asserts permission for RemotingConfiguration 
        /// TreatAsSafe - The constructor for this object is internal and this function does not take
        /// random parameters and hence can�t be used to keep random objects alive or access any other object 
        /// in the application.
        /// 
        [SecurityCritical, SecurityTreatAsSafe]
        [SecurityPermissionAttribute(SecurityAction.Assert, RemotingConfiguration = true)] 
        internal void Register()
        { 
            _lease.Register((ISponsor)this); 
        }
 
        /// 
        /// Critical - asserts permission for RemotingConfiguration
        /// TreatAsSafe - The constructor for this object is internal and this function does not take
        /// random parameters and hence can�t be used to keep random objects alive or access any other object 
        /// in the application.
        ///  
        [SecurityCritical, SecurityTreatAsSafe] 
        [SecurityPermissionAttribute(SecurityAction.Assert, RemotingConfiguration = true)]
        internal void Unregister() 
        {
            _lease.Unregister((ISponsor)this);
        }
        #endregion Internal Methods 
    }
    #endregion SponsorHelper Class 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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