public async Task CommitAsync(Enlistment enlistment)
{
using (await this.syncObject.LockAsync().Await())
{
try
{
Tracer.Debug("Commit notification received for TX id: " + this.TransactionId);
if (this.TransactionId != null)
{
// Now notify the broker that a new XA'ish transaction has completed.
TransactionInfo info = new TransactionInfo();
info.ConnectionId = this.connection.ConnectionId;
info.TransactionId = this.TransactionId;
info.Type = (int)TransactionType.CommitTwoPhase;
await this.connection.CheckConnectedAsync().Await();
await this.connection.SyncRequestAsync(info).Await();
Tracer.Debug("Transaction Commit Done TX id: " + this.TransactionId);
RecoveryLogger.LogRecovered(this.TransactionId as XATransactionId);
// if server responds that nothing needs to be done, then reply done.
enlistment.Done();
AfterCommit();
}
}
catch (Exception ex)
{
Tracer.DebugFormat("Transaction[{0}] Commit failed with error: {1}",
this.TransactionId, ex.Message);
try
{
this.connection.OnAsyncException(ex);
}
catch (Exception error)
{
Tracer.Error(error.ToString());
}
}
finally
{
this.currentEnlistment = null;
this.TransactionId = null;
this.netTxState = TxState.None;
CountDownLatch latch = this.recoveryComplete;
if (latch != null)
{
latch.countDown();
}
this.dtcControlEvent.Set();
}
}
}
/// <summary>
/// Should be called from NetTxSession when created to check if any TX
/// data is stored for recovery and whether the Broker has matching info
/// stored. If an Transaction is found that belongs to this client and is
/// still alive on the Broker it will be recovered, otherwise the stored
/// data should be cleared.
/// </summary>
public void InitializeDtcTxContext()
{
// initialize the logger with the current Resource Manager Id
RecoveryLogger.Initialize(ResourceManagerId);
KeyValuePair <XATransactionId, byte[]>[] localRecoverables = RecoveryLogger.GetRecoverables();
if (localRecoverables.Length == 0)
{
Tracer.Debug("Did not detect any open DTC transaction records on disk.");
// No local data so anything stored on the broker can't be recovered here.
return;
}
XATransactionId[] recoverables = TryRecoverBrokerTXIds();
if (recoverables.Length == 0)
{
Tracer.Debug("Did not detect any recoverable transactions at Broker.");
// Broker has no recoverable data so nothing to do here, delete the
// old recovery log as its stale.
RecoveryLogger.Purge();
return;
}
List <KeyValuePair <XATransactionId, byte[]> > matches = new List <KeyValuePair <XATransactionId, byte[]> >();
foreach (XATransactionId recoverable in recoverables)
{
foreach (KeyValuePair <XATransactionId, byte[]> entry in localRecoverables)
{
if (entry.Key.Equals(recoverable))
{
Tracer.DebugFormat("Found a matching TX on Broker to stored Id: {0} reenlisting.", entry.Key);
matches.Add(entry);
}
}
}
if (matches.Count != 0)
{
this.recoveryComplete = new CountDownLatch(matches.Count);
foreach (KeyValuePair <XATransactionId, byte[]> recoverable in matches)
{
this.transactionId = recoverable.Key;
Tracer.Info("Reenlisting recovered TX with Id: " + this.transactionId);
this.currentEnlistment =
TransactionManager.Reenlist(ResourceManagerGuid, recoverable.Value, this);
}
this.recoveryComplete.await();
Tracer.Debug("All Recovered TX enlistments Reports complete, Recovery Complete.");
TransactionManager.RecoveryComplete(ResourceManagerGuid);
return;
}
// The old recovery information doesn't match what's on the broker so we
// should discard it as its stale now.
RecoveryLogger.Purge();
}
public async Task InDoubtAsync(Enlistment enlistment)
{
using (await syncObject.LockAsync().Await())
{
try
{
Tracer.Debug("In Doubt notification received for TX id: " + this.TransactionId);
await BeforeEndAsync().Await();
// Now notify the broker that Rollback should be performed.
TransactionInfo info = new TransactionInfo();
info.ConnectionId = this.connection.ConnectionId;
info.TransactionId = this.TransactionId;
info.Type = (int)TransactionType.End;
await this.connection.CheckConnectedAsync().Await();
await this.connection.SyncRequestAsync((TransactionInfo)info.Clone()).Await();
info.Type = (int)TransactionType.Rollback;
await this.connection.CheckConnectedAsync().Await();
await this.connection.SyncRequestAsync(info).Await();
Tracer.Debug("InDoubt Transaction Rollback Done TX id: " + this.TransactionId);
RecoveryLogger.LogRecovered(this.TransactionId as XATransactionId);
// if server responds that nothing needs to be done, then reply done.
enlistment.Done();
AfterRollback();
}
finally
{
this.currentEnlistment = null;
this.TransactionId = null;
this.netTxState = TxState.None;
CountDownLatch latch = this.recoveryComplete;
if (latch != null)
{
latch.countDown();
}
this.dtcControlEvent.Set();
}
}
}
public void InDoubt(Enlistment enlistment)
{
try
{
dtcControlEvent.Reset();
Tracer.Debug("In Doubt notification received for TX id: " + this.transactionId);
BeforeEnd();
// Now notify the broker that Rollback should be performed.
TransactionInfo info = new TransactionInfo();
info.ConnectionId = this.connection.ConnectionId;
info.TransactionId = this.transactionId;
info.Type = (int)TransactionType.End;
this.connection.CheckConnected();
this.connection.SyncRequest(info);
info.Type = (int)TransactionType.Rollback;
this.connection.CheckConnected();
this.connection.SyncRequest(info);
Tracer.Debug("InDoubt Transaction Rollback Done TX id: " + this.transactionId);
RecoveryLogger.LogRecovered(this.transactionId as XATransactionId);
// if server responds that nothing needs to be done, then reply done.
enlistment.Done();
AfterRollback();
}
finally
{
this.currentEnlistment = null;
this.transactionId = null;
CountDownLatch latch = this.recoveryComplete;
if (latch != null)
{
latch.countDown();
}
this.dtcControlEvent.Set();
}
}
public async Task PrepareAsync(PreparingEnlistment preparingEnlistment)
{
using (await this.syncObject.LockAsync().Await())
{
this.netTxState = TxState.Pending;
try
{
Tracer.Debug("Prepare notification received for TX id: " + this.TransactionId);
await BeforeEndAsync().Await();
// Before sending the request to the broker, log the recovery bits, if
// this fails we can't prepare and the TX should be rolled back.
RecoveryLogger.LogRecoveryInfo(this.TransactionId as XATransactionId,
preparingEnlistment.RecoveryInformation());
// Inform the broker that work on the XA'sh TX Branch is complete.
TransactionInfo info = new TransactionInfo();
info.ConnectionId = this.connection.ConnectionId;
info.TransactionId = this.TransactionId;
info.Type = (int)TransactionType.End;
await this.connection.CheckConnectedAsync().Await();
await this.connection.SyncRequestAsync((TransactionInfo)info.Clone()).Await();
// Prepare the Transaction for commit.
info.Type = (int)TransactionType.Prepare;
IntegerResponse response = (IntegerResponse)await this.connection.SyncRequestAsync(info).Await();
if (response.Result == XA_READONLY)
{
Tracer.Debug("Transaction Prepare done and doesn't need a commit, TX id: " + this.TransactionId);
this.TransactionId = null;
this.currentEnlistment = null;
// Read Only means there's nothing to recover because there was no
// change on the broker.
RecoveryLogger.LogRecovered(this.TransactionId as XATransactionId);
// if server responds that nothing needs to be done, then reply done.
// otherwise the DTC will call Commit or Rollback but another transaction
// can already be in progress and this one would be commited or rolled back
// immediately.
preparingEnlistment.Done();
// Done so commit won't be called.
AfterCommit();
// A Read-Only TX is considered closed at this point, DTC won't call us again.
this.dtcControlEvent.Set();
}
else
{
Tracer.Debug("Transaction Prepare succeeded TX id: " + this.TransactionId);
// If work finished correctly, reply prepared
preparingEnlistment.Prepared();
}
}
catch (Exception ex)
{
Tracer.DebugFormat("Transaction[{0}] Prepare failed with error: {1}",
this.TransactionId, ex.Message);
AfterRollback();
preparingEnlistment.ForceRollback();
try
{
this.connection.OnAsyncException(ex);
}
catch (Exception error)
{
Tracer.Error(error.ToString());
}
this.currentEnlistment = null;
this.TransactionId = null;
this.netTxState = TxState.None;
this.dtcControlEvent.Set();
}
}
}
public void Rollback(Enlistment enlistment)
{
lock (this.syncObject)
{
try
{
Tracer.Debug("Rollback notification received for TX id: " + this.transactionId);
if (this.transactionId != null)
{
BeforeEnd();
// Now notify the broker that a new XA'ish transaction has started.
TransactionInfo info = new TransactionInfo();
info.ConnectionId = this.connection.ConnectionId;
info.TransactionId = this.transactionId;
info.Type = (int)TransactionType.End;
this.connection.CheckConnected();
this.connection.SyncRequest(info);
info.Type = (int)TransactionType.Rollback;
this.connection.CheckConnected();
this.connection.SyncRequest(info);
Tracer.Debug("Transaction Rollback Done TX id: " + this.transactionId);
RecoveryLogger.LogRecovered(this.transactionId as XATransactionId);
// if server responds that nothing needs to be done, then reply done.
enlistment.Done();
AfterRollback();
}
}
catch (Exception ex)
{
Tracer.DebugFormat("Transaction[{0}] Rollback failed with error: {1}",
this.transactionId, ex.Message);
AfterRollback();
try
{
this.connection.OnException(ex);
}
catch (Exception error)
{
Tracer.Error(error.ToString());
}
}
finally
{
this.currentEnlistment = null;
this.transactionId = null;
this.netTxState = TxState.None;
CountDownLatch latch = this.recoveryComplete;
if (latch != null)
{
latch.countDown();
}
this.dtcControlEvent.Set();
}
}
}
public void Prepare(PreparingEnlistment preparingEnlistment)
{
try
{
dtcControlEvent.Reset();
Tracer.Debug("Prepare notification received for TX id: " + this.transactionId);
BeforeEnd();
// Before sending the request to the broker, log the recovery bits, if
// this fails we can't prepare and the TX should be rolled back.
RecoveryLogger.LogRecoveryInfo(this.transactionId as XATransactionId,
preparingEnlistment.RecoveryInformation());
// Inform the broker that work on the XA'sh TX Branch is complete.
TransactionInfo info = new TransactionInfo();
info.ConnectionId = this.connection.ConnectionId;
info.TransactionId = this.transactionId;
info.Type = (int)TransactionType.End;
this.connection.CheckConnected();
this.connection.SyncRequest(info);
// Prepare the Transaction for commit.
info.Type = (int)TransactionType.Prepare;
IntegerResponse response = (IntegerResponse)this.connection.SyncRequest(info);
if (response.Result == XA_READONLY)
{
Tracer.Debug("Transaction Prepare done and doesn't need a commit, TX id: " + this.transactionId);
this.transactionId = null;
this.currentEnlistment = null;
// Read Only means there's nothing to recover because there was no
// change on the broker.
RecoveryLogger.LogRecovered(this.transactionId as XATransactionId);
// if server responds that nothing needs to be done, then reply prepared
// but clear the current state data so we appear done to the commit method.
preparingEnlistment.Prepared();
// Done so commit won't be called.
AfterCommit();
}
else
{
Tracer.Debug("Transaction Prepare succeeded TX id: " + this.transactionId);
// If work finished correctly, reply prepared
preparingEnlistment.Prepared();
}
}
catch (Exception ex)
{
Tracer.DebugFormat("Transaction[{0}] Prepare failed with error: {1}",
this.transactionId, ex.Message);
AfterRollback();
preparingEnlistment.ForceRollback();
try
{
this.connection.OnException(ex);
}
catch (Exception error)
{
Tracer.Error(error.ToString());
}
this.currentEnlistment = null;
this.transactionId = null;
}
finally
{
this.dtcControlEvent.Set();
}
}
