DTCTransactionManager.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / tx / System / Transactions / Oletx / DTCTransactionManager.cs / 1305376 / DTCTransactionManager.cs
                        
                        
                            using System; 
using System.Runtime.InteropServices;
using System.Globalization;
using System.Security.Permissions;
using System.Runtime.CompilerServices; 
using System.Transactions.Diagnostics;
 
namespace System.Transactions.Oletx 
{
    internal class DtcTransactionManager 
    {
        string nodeName;
        OletxTransactionManager oletxTm;
        IDtcProxyShimFactory proxyShimFactory; 
        UInt32 whereaboutsSize;
        byte[] whereabouts; 
        bool initialized; 

        internal DtcTransactionManager( string nodeName, OletxTransactionManager oletxTm ) 
        {
            this.nodeName = nodeName;
            this.oletxTm = oletxTm;
            this.initialized = false; 
            this.proxyShimFactory = OletxTransactionManager.proxyShimFactory;
        } 
 
        // This is here for the DangerousGetHandle call.  We need to do it.
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2001:AvoidCallingProblematicMethods")] 
        void Initialize()
        {
            if ( this.initialized )
            { 
                return;
            } 
 
            OletxInternalResourceManager internalRM = this.oletxTm.internalResourceManager;
            IntPtr handle = IntPtr.Zero; 
            IResourceManagerShim resourceManagerShim = null;
            bool nodeNameMatches = false;

            CoTaskMemHandle whereaboutsBuffer = null; 
            RuntimeHelpers.PrepareConstrainedRegions();
            try 
            { 
                handle = HandleTable.AllocHandle( internalRM );
 
                this.proxyShimFactory.ConnectToProxy(
                    this.nodeName,
                    internalRM.Identifier,
                    handle, 
                    out nodeNameMatches,
                    out this.whereaboutsSize, 
                    out whereaboutsBuffer, 
                    out resourceManagerShim
                    ); 

                // If the node name does not match, throw.
                if ( ! nodeNameMatches )
                { 
                    throw new NotSupportedException( SR.GetString( SR.ProxyCannotSupportMultipleNodeNames ) );
                } 
 
                // Make a managed copy of the whereabouts.
                if ( ( null != whereaboutsBuffer ) && ( 0 != this.whereaboutsSize  ) ) 
                {
                    this.whereabouts = new byte[ this.whereaboutsSize ];
                    Marshal.Copy( whereaboutsBuffer.DangerousGetHandle(), this.whereabouts, 0, Convert.ToInt32(this.whereaboutsSize) );
                } 

                // Give the IResourceManagerShim to the internalRM and tell it to call ReenlistComplete. 
                internalRM.resourceManagerShim = resourceManagerShim; 
                internalRM.CallReenlistComplete();
 

                this.initialized = true;
            }
            catch( COMException ex ) 
            {
                if ( NativeMethods.XACT_E_NOTSUPPORTED == ex.ErrorCode ) 
                { 
                    throw new NotSupportedException( SR.GetString( SR.CannotSupportNodeNameSpecification ) );
                } 

                OletxTransactionManager.ProxyException( ex );

                // Unfortunately MSDTCPRX may return unknown error codes when attempting to connect to MSDTC 
                // that error should be propagated back as a TransactionManagerCommunicationException.
                throw TransactionManagerCommunicationException.Create( 
                    SR.GetString( SR.TraceSourceOletx ), 
                    SR.GetString( SR.TransactionManagerCommunicationException ),
                    ex 
                    );
            }
            finally
            { 
                if ( null != whereaboutsBuffer )
                { 
                    whereaboutsBuffer.Close(); 
                }
 
                // If we weren't successful at initializing ourself, clear things out
                // for next time around.
                if ( !this.initialized )
                { 
                    if ( handle != IntPtr.Zero && null == resourceManagerShim )
                    { 
                        HandleTable.FreeHandle( handle ); 
                    }
 
                    if ( null != this.whereabouts )
                    {
                        this.whereabouts = null;
                        this.whereaboutsSize = 0; 
                    }
                } 
            } 
        }
 
        internal IDtcProxyShimFactory ProxyShimFactory
        {
            get
            { 
                if ( !this.initialized )
                { 
                    lock( this ) 
                    {
                        Initialize(); 
                    }
                }
                return this.proxyShimFactory;
            } 
        }
 
        internal void ReleaseProxy() 
        {
            lock( this ) 
            {
                this.whereabouts = null;
                this.whereaboutsSize = 0;
                this.initialized = false; 
            }
        } 
 
        internal byte[] Whereabouts
        { 
            get
            {
                if ( !this.initialized )
                { 
                    lock( this )
                    { 
                        Initialize(); 
                    }
                } 
                return whereabouts;
            }
        }
 
        internal static UInt32 AdjustTimeout(
            TimeSpan timeout 
            ) 
        {
            UInt32 returnTimeout = 0; 

            try
            {
                returnTimeout = ( Convert.ToUInt32( timeout.TotalMilliseconds, CultureInfo.CurrentCulture ) ); 
            }
                // timeout.TotalMilliseconds might be negative, so let's catch overflow exceptions, just in case. 
            catch ( OverflowException caughtEx ) 
            {
                if ( DiagnosticTrace.Verbose ) 
                {
                    ExceptionConsumedTraceRecord.Trace( SR.GetString( SR.TraceSourceOletx ),
                        caughtEx );
                } 
                returnTimeout = UInt32.MaxValue;
            } 
            return returnTimeout; 
        }
 
    }
}

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

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