LogFlushAsyncResult.cs source code in C# .NET

                        Code:
                         / WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / Log / System / IO / Log / LogFlushAsyncResult.cs / 1 / LogFlushAsyncResult.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------
namespace System.IO.Log
{ 
    using System;
    using System.Collections.Generic; 
    using System.Runtime.InteropServices; 
    using System.Security.Permissions;
    using System.Threading; 

    using Microsoft.Win32.SafeHandles;

    sealed class LogFlushAsyncResult : OverlappedAsyncResult 
    {
        LogRecordSequence recordSequence; 
        ulong sequenceNumber; 
        object boxedResultLsn;
        GCHandle pinnedResultLsn; 

        internal LogFlushAsyncResult(LogRecordSequence recordSequence,
                                     AsyncCallback callback,
                                     object state) 
            : base(callback, state)
        { 
            this.recordSequence = recordSequence; 
        }
 
        //===========================================================
        // Parameters
        //===========================================================
        internal ulong SequenceNumber 
        {
            /* get { return this.sequenceNumber; } */ 
            set { this.sequenceNumber = value; } 
        }
 
        //============================================================
        // Result
        //===========================================================
        internal ulong ResultLsn 
        {
            get { return (ulong)this.boxedResultLsn; } 
        } 

        internal void Start() 
        {
            try
            {
                ulong resultLsn = 0; 

                this.boxedResultLsn = (object)(resultLsn); 
                this.pinnedResultLsn = GCHandle.Alloc(this.boxedResultLsn, 
                                                      GCHandleType.Pinned);
 
                Pack(this.boxedResultLsn);

                uint errorCode;
                unsafe 
                {
                    errorCode = UnsafeNativeMethods.FlushLogToLsnAsync( 
                        this.recordSequence.MarshalContext, 
                        ref this.sequenceNumber,
                        this.pinnedResultLsn.AddrOfPinnedObject(), 
                        this.NativeOverlapped);
                }

                if (errorCode != Error.ERROR_IO_PENDING) 
                {
                    // We don't need to call Free() in a finally block, 
                    // because any exception will failfast the process 
                    Free();
 
                    this.pinnedResultLsn.Free();

                    if (errorCode == Error.ERROR_SUCCESS)
                    { 
                        Complete(true, null);
                    } 
                    else 
                    {
                        Complete( 
                            true,
                            UnsafeNativeMethods.FlushLogToLsnFilter(errorCode));
                    }
                } 
            }
#pragma warning suppress 56500 // We will be terminating the process with any exception in this call 
            catch(Exception e) 
            {
                // The code in the try block should not throw any exceptions. 
                // If an exception is caught here, IO.Log may be in an unknown state.
                // We prefer to failfast instead of risking the possibility of log corruption.
                // Any client code using IO.Log must have a recovery model that can deal
                // with appdomain and process failures. 
                DiagnosticUtility.InvokeFinalHandler(e);
            } 
        } 

        internal override void IOCompleted(uint errorCode) 
        {
            this.pinnedResultLsn.Free();
            if (errorCode == Error.ERROR_SUCCESS)
            { 
                Complete(false, null);
            } 
            else 
            {
                Complete(false, 
                         UnsafeNativeMethods.FlushLogToLsnFilter(errorCode));
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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LogFlushAsyncResult.cs source code in C# .NET

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