FileRecordSequenceCompletedAsyncResult.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 / ndp / cdf / src / WCF / Log / System / IO / Log / FileRecordSequenceCompletedAsyncResult.cs / 1305376 / FileRecordSequenceCompletedAsyncResult.cs

                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.IO.Log 
{
    using System; 
    using System.Diagnostics; 
    using System.Runtime;
    using System.Threading; 

    enum Work
    {
        Append, 
        Flush,
        ReserveAndAppend, 
        WriteRestartArea 
    }
 
    sealed class FileRecordSequenceCompletedAsyncResult : IAsyncResult
    {
        SequenceNumber result;
        object         userState; 
        AsyncCallback  callback;
        bool           endCalled; 
        Work           work; 
        object         syncRoot;
 
        ManualResetEvent waitHandle;

        public FileRecordSequenceCompletedAsyncResult(
            SequenceNumber result, 
            AsyncCallback callback,
            object userState, 
            Work work) 
        {
            this.result = result; 
            this.callback = callback;
            this.userState = userState;
            this.work = work;
 
            this.syncRoot = new object();
 
            if (this.callback != null) 
            {
                try 
                {
                    this.callback(this);
                }
#pragma warning suppress 56500 // This is a callback exception 
                catch(Exception e)
                { 
                    if (Fx.IsFatal(e)) 
                        throw;
 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperCallback(e);
                }
            }
        } 

        public Object AsyncState 
        { 
            get { return this.userState; }
        } 

        public WaitHandle AsyncWaitHandle
        {
            get 
            {
                lock(this.syncRoot) 
                { 
                    // We won't ever close it (it must be GC'd instead), but try
                    // not to be too excessive in allocations. 
                    //
                    if (this.waitHandle == null)
                        this.waitHandle = new ManualResetEvent(true);
                } 

                return this.waitHandle; 
            } 
        }
 
        public bool CompletedSynchronously
        {
            get { return true; }
        } 

        public Work CompletedWork 
        { 
            get { return this.work; }
        } 

        public bool IsCompleted
        {
            get { return true; } 
        }
 
        internal SequenceNumber End() 
        {
            if (this.endCalled) 
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.DuplicateEnd());
            }
            this.endCalled = true; 

            return this.result; 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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