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NpgsqlPromotableSinglePhaseNotification.cs
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// NpgsqlPromotableSinglePhaseNotification.cs
//
// Author:
// Josh Cooley <jbnpgsql@tuxinthebox.net>
//
// Copyright (C) 2007, The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
using System;
using System.Reflection;
using System.Transactions;
using Common.Logging;
namespace Npgsql
{
internal class NpgsqlPromotableSinglePhaseNotification : IPromotableSinglePhaseNotification
{
private readonly NpgsqlConnection _connection;
private IsolationLevel _isolationLevel;
private NpgsqlTransaction _npgsqlTx;
private NpgsqlTransactionCallbacks _callbacks;
private INpgsqlResourceManager _rm;
private bool _inTransaction;
internal bool InLocalTransaction { get { return _npgsqlTx != null; } }
static readonly ILog _log = LogManager.GetCurrentClassLogger();
public NpgsqlPromotableSinglePhaseNotification(NpgsqlConnection connection)
{
_connection = connection;
}
public void Enlist(Transaction tx)
{
_log.Debug("Enlist");
if (tx != null)
{
_isolationLevel = tx.IsolationLevel;
if (!tx.EnlistPromotableSinglePhase(this))
{
// must already have a durable resource
// start transaction
_npgsqlTx = _connection.BeginTransaction(ConvertIsolationLevel(_isolationLevel));
_inTransaction = true;
_rm = CreateResourceManager();
_callbacks = new NpgsqlTransactionCallbacks(_connection);
_rm.Enlist(_callbacks, TransactionInterop.GetTransmitterPropagationToken(tx));
// enlisted in distributed transaction
// disconnect and cleanup local transaction
_npgsqlTx.Cancel();
_npgsqlTx.Dispose();
_npgsqlTx = null;
}
}
}
/// <summary>
/// Used when a connection is closed
/// </summary>
public void Prepare()
{
_log.Debug("Prepare");
if (_inTransaction)
{
// may not be null if Promote or Enlist is called first
if (_callbacks == null)
{
_callbacks = new NpgsqlTransactionCallbacks(_connection);
}
_callbacks.PrepareTransaction();
if (_npgsqlTx != null)
{
// cancel the NpgsqlTransaction since this will
// be handled by a two phase commit.
_npgsqlTx.Cancel();
_npgsqlTx.Dispose();
_npgsqlTx = null;
_connection.PromotableLocalTransactionEnded();
}
}
}
#region IPromotableSinglePhaseNotification Members
public void Initialize()
{
_log.Debug("Initialize");
_npgsqlTx = _connection.BeginTransaction(ConvertIsolationLevel(_isolationLevel));
_inTransaction = true;
}
public void Rollback(SinglePhaseEnlistment singlePhaseEnlistment)
{
_log.Debug("Rollback");
// try to rollback the transaction with either the
// ADO.NET transaction or the callbacks that managed the
// two phase commit transaction.
if (_npgsqlTx != null)
{
_npgsqlTx.Rollback();
_npgsqlTx.Dispose();
_npgsqlTx = null;
singlePhaseEnlistment.Aborted();
_connection.PromotableLocalTransactionEnded();
}
else if (_callbacks != null)
{
if (_rm != null)
{
_rm.RollbackWork(_callbacks.GetName());
singlePhaseEnlistment.Aborted();
}
else
{
_callbacks.RollbackTransaction();
singlePhaseEnlistment.Aborted();
}
_callbacks = null;
}
_inTransaction = false;
}
public void SinglePhaseCommit(SinglePhaseEnlistment singlePhaseEnlistment)
{
_log.Debug("Single Phase Commit");
if (_npgsqlTx != null)
{
_npgsqlTx.Commit();
_npgsqlTx.Dispose();
_npgsqlTx = null;
singlePhaseEnlistment.Committed();
_connection.PromotableLocalTransactionEnded();
}
else if (_callbacks != null)
{
if (_rm != null)
{
_rm.CommitWork(_callbacks.GetName());
singlePhaseEnlistment.Committed();
}
else
{
_callbacks.CommitTransaction();
singlePhaseEnlistment.Committed();
}
_callbacks = null;
}
_inTransaction = false;
}
#endregion
#region ITransactionPromoter Members
public byte[] Promote()
{
_log.Debug("Promote");
_rm = CreateResourceManager();
// may not be null if Prepare or Enlist is called first
if (_callbacks == null)
{
_callbacks = new NpgsqlTransactionCallbacks(_connection);
}
byte[] token = _rm.Promote(_callbacks);
// mostly likely case for this is the transaction has been prepared.
if (_npgsqlTx != null)
{
// cancel the NpgsqlTransaction since this will
// be handled by a two phase commit.
_npgsqlTx.Cancel();
_npgsqlTx.Dispose();
_npgsqlTx = null;
_connection.PromotableLocalTransactionEnded();
}
return token;
}
#endregion
private static INpgsqlResourceManager _resourceManager;
private static System.Runtime.Remoting.Lifetime.ClientSponsor _sponser;
private static INpgsqlResourceManager CreateResourceManager()
{
// TODO: create network proxy for resource manager
if (_resourceManager == null)
{
_sponser = new System.Runtime.Remoting.Lifetime.ClientSponsor();
AppDomain rmDomain = AppDomain.CreateDomain("NpgsqlResourceManager", AppDomain.CurrentDomain.Evidence, AppDomain.CurrentDomain.SetupInformation);
_resourceManager =
(INpgsqlResourceManager)
rmDomain.CreateInstanceAndUnwrap(typeof (NpgsqlResourceManager).Assembly.FullName,
typeof (NpgsqlResourceManager).FullName);
_sponser.Register((MarshalByRefObject)_resourceManager);
}
return _resourceManager;
//return new NpgsqlResourceManager();
}
private static System.Data.IsolationLevel ConvertIsolationLevel(IsolationLevel _isolationLevel)
{
switch (_isolationLevel)
{
case IsolationLevel.Chaos:
return System.Data.IsolationLevel.Chaos;
case IsolationLevel.ReadCommitted:
return System.Data.IsolationLevel.ReadCommitted;
case IsolationLevel.ReadUncommitted:
return System.Data.IsolationLevel.ReadUncommitted;
case IsolationLevel.RepeatableRead:
return System.Data.IsolationLevel.RepeatableRead;
case IsolationLevel.Serializable:
return System.Data.IsolationLevel.Serializable;
case IsolationLevel.Snapshot:
return System.Data.IsolationLevel.Snapshot;
case IsolationLevel.Unspecified:
default:
return System.Data.IsolationLevel.Unspecified;
}
}
}
}