TrackingServices.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Runtime / Remoting / TrackingServices.cs / 1 / TrackingServices.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** File:    TrackingServices.cs 
**
** 
** Purpose: Defines the services for tracking lifetime and other
**          operations on objects.
**
** 
===========================================================*/
namespace System.Runtime.Remoting.Services { 
    using System.Security.Permissions;	 
    using System;
    using System.Threading; 
    using System.Globalization;

[System.Runtime.InteropServices.ComVisible(true)]
public interface ITrackingHandler 
{
    // Notify a handler that an object has been marshaled 
    [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] 		 
    void MarshaledObject(Object obj, ObjRef or);
 
    // Notify a handler that an object has been unmarshaled
    [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] 		
    void UnmarshaledObject(Object obj, ObjRef or);
 
    // Notify a handler that an object has been disconnected
    [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] 		 
    void DisconnectedObject(Object obj); 

} 


[SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)]	
[System.Runtime.InteropServices.ComVisible(true)] 
public class TrackingServices
{ 
    // Private member variables 
    private static ITrackingHandler[] _Handlers = new ITrackingHandler[0];  // Array of registered tracking handlers
    private static int _Size = 0;                                           // Number of elements in the array 

    private static Object s_TrackingServicesSyncObject = null;

    private static Object TrackingServicesSyncObject 
    {
        get 
        { 
            if (s_TrackingServicesSyncObject == null)
            { 
                Object o = new Object();
                Interlocked.CompareExchange(ref s_TrackingServicesSyncObject, o, null);
            }
            return s_TrackingServicesSyncObject; 
        }
    } 
 
    public static void RegisterTrackingHandler(ITrackingHandler handler)
    { 
        lock(TrackingServicesSyncObject)
        {
            // Validate arguments
            if(null == handler) 
            {
                throw new ArgumentNullException("handler"); 
            } 

            // Check to make sure that the handler has not been registered 
            if(-1 == Match(handler))
            {
                // Allocate a new array if necessary
                if((null == _Handlers) || (_Size == _Handlers.Length)) 
                {
                    ITrackingHandler[] temp = new ITrackingHandler[_Size*2+4]; 
                    if(null != _Handlers) 
                    {
                        Array.Copy(_Handlers, temp, _Size); 
                    }
                    _Handlers = temp;
                }
 
                _Handlers[_Size++] = handler;
            } 
            else 
            {
                throw new RemotingException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Remoting_TrackingHandlerAlreadyRegistered"), "handler")); 
            }
        }
    }
 
    public static void UnregisterTrackingHandler(ITrackingHandler handler)
    { 
        lock(TrackingServicesSyncObject) 
        {
            // Validate arguments 
            if(null == handler)
            {
                throw new ArgumentNullException("handler");
            } 

            // Check to make sure that the channel has been registered 
            int matchingIdx = Match(handler); 
            if(-1 == matchingIdx)
            { 
                throw new RemotingException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Remoting_HandlerNotRegistered"), handler));
            }

            // Delete the entry by copying the remaining entries 
            Array.Copy(_Handlers, matchingIdx+1, _Handlers, matchingIdx, _Size-matchingIdx-1);
            _Size--; 
        } 
    }
 
    public static ITrackingHandler[] RegisteredHandlers
    {
        get
        { 
            lock(TrackingServicesSyncObject)
            { 
                if(0 == _Size) 
                {
                    return new ITrackingHandler[0]; 
                }
                else
                {
                    // Copy the array of registered handlers into a new array 
                    // and return
                    ITrackingHandler[] temp = new ITrackingHandler[_Size]; 
                    for(int i = 0; i < _Size; i++) 
                    {
                        temp[i] = _Handlers[i]; 
                    }
                    return temp;
                }
            } 
        }
    } 
 
    // Notify all the handlers that an object has been marshaled
    internal static void MarshaledObject(Object obj, ObjRef or) 
    {
        try{
            ITrackingHandler[] temp = _Handlers;
            for(int i = 0; i < _Size; i++) 
            {
                temp[i].MarshaledObject(obj, or); 
            } 
        }
        catch {} 
    }

    // Notify all the handlers that an object has been unmarshaled
    internal static void UnmarshaledObject(Object obj, ObjRef or) 
    {
        try{ 
            ITrackingHandler[] temp = _Handlers; 
            for(int i = 0; i < _Size; i++)
            { 
                temp[i].UnmarshaledObject(obj, or);
            }
        }
        catch {} 
    }
 
    // Notify all the handlers that an object has been disconnected 
    internal static void DisconnectedObject(Object obj)
    { 
        try{
            ITrackingHandler[] temp = _Handlers;
            for(int i = 0; i < _Size; i++)
            { 
                temp[i].DisconnectedObject(obj);
            } 
        } 
        catch {}
    } 

    private static int Match(ITrackingHandler handler)
    {
        int idx = -1; 

        for(int i = 0; i < _Size; i++) 
        { 
            if(_Handlers[i] == handler)
            { 
                idx = i;
                break;
            }
        } 

        return idx; 
    } 
}
 
} // namespace
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