Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / RunTime / Hosting / LocalTransaction.cs / 1305376 / LocalTransaction.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- #region Using directives using System; using System.Diagnostics; using System.Transactions; using System.Data; using System.Data.Common; using System.Threading; #endregion namespace System.Workflow.Runtime.Hosting { ////// This class wraps a local transaction (DbTransaction) by implementing IPromotableSinglePhaseNotification: /// It instantiate a DbTransaction and never allows promotion to a DTC transaction. /// internal sealed class LocalTransaction : IPromotableSinglePhaseNotification { readonly DbTransaction transaction; System.Data.Common.DbConnection connection; ManualResetEvent handle; object syncRoot = new Object(); #region Constructor ////// Wraps a local transaction inside /// /// internal LocalTransaction(DbResourceAllocator dbHelper, ManualResetEvent handle) { if (null == handle) throw new ArgumentNullException("handle"); // Open a connection that specifically does not auto-enlist ("Enlist=false" in connection string) // to prevent auto-promotion of the transaction this.connection = dbHelper.OpenNewConnectionNoEnlist(); this.transaction = this.connection.BeginTransaction(); this.handle = handle; } #endregion Constructor #region Accessors public System.Data.Common.DbConnection Connection { get { return this.connection; } } public DbTransaction Transaction { get { return this.transaction; } } #endregion Accessors #region IPromotableSinglePhaseNotification Members public void Initialize() { } public void SinglePhaseCommit(SinglePhaseEnlistment en) { if (en == null) throw new ArgumentNullException("en"); // // Wait until IPendingWork members have completed (WinOE bugs 17580 and 13395) try { handle.WaitOne(); } catch (ObjectDisposedException) { // If an ObjectDisposedException is thrown because // the WaitHandle has already closed, nothing to worry // about. Move on. } lock (syncRoot) { try { this.transaction.Commit(); en.Committed(); } catch (Exception e) { en.Aborted(e); } finally { if ((null != connection) && (ConnectionState.Closed != connection.State)) { connection.Close(); connection = null; } } } } public void Rollback(SinglePhaseEnlistment en) { if (en == null) throw new ArgumentNullException("en"); // // Wait until IPendingWork members have completed (WinOE bugs 17580 and 13395) try { handle.WaitOne(); } catch (ObjectDisposedException) { // If an ObjectDisposedException is thrown because // the WaitHandle has already closed, nothing to worry // about. Move on. } // DbTransaction.Dispose will call Rollback if the DbTransaction is not Zombied. // Not safe to call DbTransaction.Rollback here as the the underlining // DbTransaction may have already been Rolled back lock (syncRoot) { if (null != transaction) transaction.Dispose(); if ((null != connection) && (ConnectionState.Closed != connection.State)) { connection.Close(); connection = null; } en.Aborted(); } } public byte[] Promote() { throw new TransactionPromotionException( ExecutionStringManager.PromotionNotSupported); } #endregion IPromotableSinglePhaseNotification Members } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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