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125 lines
4.5 KiB
125 lines
4.5 KiB
// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License version 2 as published by
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// the Free Software Foundation
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//
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// There are special exceptions to the terms and conditions of the GPL
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// as it is applied to this software. View the full text of the
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// exception in file EXCEPTIONS in the directory of this software
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// distribution.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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using System.Transactions;
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using System.Collections;
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using System.Data;
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namespace MySql.Data.MySqlClient
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{
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internal sealed class MySqlPromotableTransaction : IPromotableSinglePhaseNotification, ITransactionPromoter
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{
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private MySqlConnection connection;
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private Transaction baseTransaction;
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private MySqlTransaction simpleTransaction;
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public MySqlPromotableTransaction(MySqlConnection connection, Transaction baseTransaction)
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{
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this.connection = connection;
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this.baseTransaction = baseTransaction;
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}
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public Transaction BaseTransaction
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{
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get { return baseTransaction; }
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}
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void IPromotableSinglePhaseNotification.Initialize()
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{
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string valueName = Enum.GetName(
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typeof(System.Transactions.IsolationLevel), baseTransaction.IsolationLevel);
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System.Data.IsolationLevel dataLevel = (System.Data.IsolationLevel)Enum.Parse(
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typeof(System.Data.IsolationLevel), valueName);
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simpleTransaction = connection.BeginTransaction(dataLevel);
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}
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void IPromotableSinglePhaseNotification.Rollback(SinglePhaseEnlistment singlePhaseEnlistment)
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{
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// prevent commands in main thread to run concurrently
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Driver driver = connection.driver;
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lock (driver)
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{
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while (connection.Reader != null)
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{
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// wait for reader to finish. Maybe we should not wait
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// forever and cancel it after some time?
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System.Threading.Thread.Sleep(100);
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}
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simpleTransaction.Rollback();
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singlePhaseEnlistment.Aborted();
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DriverTransactionManager.RemoveDriverInTransaction(baseTransaction);
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driver.CurrentTransaction = null;
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if (connection.State == ConnectionState.Closed)
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connection.CloseFully();
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}
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}
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void IPromotableSinglePhaseNotification.SinglePhaseCommit(SinglePhaseEnlistment singlePhaseEnlistment)
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{
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simpleTransaction.Commit();
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singlePhaseEnlistment.Committed();
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DriverTransactionManager.RemoveDriverInTransaction(baseTransaction);
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connection.driver.CurrentTransaction = null;
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if (connection.State == ConnectionState.Closed)
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connection.CloseFully();
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}
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byte[] ITransactionPromoter.Promote()
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{
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throw new NotSupportedException();
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}
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}
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internal class DriverTransactionManager
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{
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private static Hashtable driversInUse = new Hashtable();
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public static Driver GetDriverInTransaction(Transaction transaction)
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{
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lock (driversInUse.SyncRoot)
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{
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Driver d = (Driver)driversInUse[transaction.GetHashCode()];
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return d;
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}
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}
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public static void SetDriverInTransaction(Driver driver)
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{
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lock (driversInUse.SyncRoot)
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{
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driversInUse[driver.CurrentTransaction.BaseTransaction.GetHashCode()] = driver;
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}
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}
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public static void RemoveDriverInTransaction(Transaction transaction)
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{
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lock (driversInUse.SyncRoot)
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{
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driversInUse.Remove(transaction.GetHashCode());
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}
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}
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}
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}
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