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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