FileRecordSequenceCompletedAsyncResult.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / Log / System / IO / Log / FileRecordSequenceCompletedAsyncResult.cs / 1 / FileRecordSequenceCompletedAsyncResult.cs

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

namespace System.IO.Log 
{
    using System; 
    using System.Diagnostics; 
    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 (DiagnosticUtility.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.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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