public byte[] Promote()
{
Exception exception;
SqlInternalConnection validConnection = this.GetValidConnection();
byte[] promotedDTCToken = null;
SqlConnection connection = validConnection.Connection;
Bid.Trace("<sc.SqlDelegatedTransaction.Promote|RES|CPOOL> %d#, Connection %d#, promoting transaction.\n", this.ObjectID, validConnection.ObjectID);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
lock (validConnection)
{
try
{
this.ValidateActiveOnConnection(validConnection);
validConnection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Promote, null, System.Data.IsolationLevel.Unspecified, this._internalTransaction, true);
promotedDTCToken = this._connection.PromotedDTCToken;
exception = null;
}
catch (SqlException exception3)
{
exception = exception3;
ADP.TraceExceptionWithoutRethrow(exception3);
validConnection.DoomThisConnection();
}
catch (InvalidOperationException exception2)
{
exception = exception2;
ADP.TraceExceptionWithoutRethrow(exception2);
validConnection.DoomThisConnection();
}
}
}
catch (OutOfMemoryException exception6)
{
connection.Abort(exception6);
throw;
}
catch (StackOverflowException exception5)
{
connection.Abort(exception5);
throw;
}
catch (ThreadAbortException exception4)
{
connection.Abort(exception4);
throw;
}
if (exception != null)
{
throw SQL.PromotionFailed(exception);
}
return(promotedDTCToken);
}
public void Rollback(SinglePhaseEnlistment enlistment)
{
SqlInternalConnection validConnection = this.GetValidConnection();
SqlConnection connection = validConnection.Connection;
Bid.Trace("<sc.SqlDelegatedTransaction.Rollback|RES|CPOOL> %d#, Connection %d#, aborting transaction.\n", this.ObjectID, validConnection.ObjectID);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
lock (validConnection)
{
try
{
this.ValidateActiveOnConnection(validConnection);
this._active = false;
this._connection = null;
validConnection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Rollback, null, System.Data.IsolationLevel.Unspecified, this._internalTransaction, true);
}
catch (SqlException exception5)
{
ADP.TraceExceptionWithoutRethrow(exception5);
validConnection.DoomThisConnection();
}
catch (InvalidOperationException exception4)
{
ADP.TraceExceptionWithoutRethrow(exception4);
validConnection.DoomThisConnection();
}
}
validConnection.CleanupConnectionOnTransactionCompletion(this._atomicTransaction);
enlistment.Aborted();
}
catch (OutOfMemoryException exception3)
{
connection.Abort(exception3);
throw;
}
catch (StackOverflowException exception2)
{
connection.Abort(exception2);
throw;
}
catch (ThreadAbortException exception)
{
connection.Abort(exception);
throw;
}
}
public void Initialize()
{
// if we get here, then we know for certain that we're the delegated
// transaction.
SqlInternalConnection connection = _connection;
SqlConnection usersConnection = connection.Connection;
Bid.Trace("<sc.SqlDelegatedTransaction.Initialize|RES|CPOOL> %d#, Connection %d#, delegating transaction.\n", ObjectID, connection.ObjectID);
RuntimeHelpers.PrepareConstrainedRegions();
try {
#if DEBUG
TdsParser.ReliabilitySection tdsReliabilitySection = new TdsParser.ReliabilitySection();
RuntimeHelpers.PrepareConstrainedRegions();
try {
tdsReliabilitySection.Start();
#else
{
#endif //DEBUG
if (connection.IsEnlistedInTransaction) // defect first
{
Bid.Trace("<sc.SqlDelegatedTransaction.Initialize|RES|CPOOL> %d#, Connection %d#, was enlisted, now defecting.\n", ObjectID, connection.ObjectID);
connection.EnlistNull();
}
_internalTransaction = new SqlInternalTransaction(connection, TransactionType.Delegated, null);
connection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Begin, null, _isolationLevel, _internalTransaction, true);
// Handle case where ExecuteTran didn't produce a new transaction, but also didn't throw.
if (null == connection.CurrentTransaction)
{
connection.DoomThisConnection();
throw ADP.InternalError(ADP.InternalErrorCode.UnknownTransactionFailure);
}
_active = true;
}
#if DEBUG
finally {
tdsReliabilitySection.Stop();
}
#endif //DEBUG
}
catch (System.OutOfMemoryException e) {
usersConnection.Abort(e);
throw;
}
catch (System.StackOverflowException e) {
usersConnection.Abort(e);
throw;
}
catch (System.Threading.ThreadAbortException e) {
usersConnection.Abort(e);
throw;
}
}
private void ValidateActiveOnConnection(SqlInternalConnection connection)
{
if ((!this._active || (connection != this._connection)) || (connection.DelegatedTransaction != this))
{
if (connection != null)
{
connection.DoomThisConnection();
}
if ((connection != this._connection) && (this._connection != null))
{
this._connection.DoomThisConnection();
}
throw ADP.InternalError(ADP.InternalErrorCode.UnpooledObjectHasWrongOwner);
}
}
public void Initialize()
{
// if we get here, then we know for certain that we're the delegated
// transaction.
SqlInternalConnection connection = _connection;
SqlConnection usersConnection = connection.Connection;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
if (connection.IsEnlistedInTransaction)
{ // defect first
connection.EnlistNull();
}
_internalTransaction = new SqlInternalTransaction(connection, TransactionType.Delegated, null);
connection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Begin, null, _isolationLevel, _internalTransaction, true);
// Handle case where ExecuteTran didn't produce a new transaction, but also didn't throw.
if (null == connection.CurrentTransaction)
{
connection.DoomThisConnection();
throw ADP.InternalError(ADP.InternalErrorCode.UnknownTransactionFailure);
}
_active = true;
}
catch (System.OutOfMemoryException e)
{
usersConnection.Abort(e);
throw;
}
catch (System.StackOverflowException e)
{
usersConnection.Abort(e);
throw;
}
catch (System.Threading.ThreadAbortException e)
{
usersConnection.Abort(e);
throw;
}
}
// Dooms connection and throws and error if not a valid, active, delegated transaction for the given
// connection. Designed to be called AFTER a lock is placed on the connection, otherwise a normal return
// may not be trusted.
private void ValidateActiveOnConnection(SqlInternalConnection connection)
{
bool valid = _active && (connection == _connection) && (connection.DelegatedTransaction == this);
if (!valid)
{
// Invalid indicates something BAAAD happened (Commit after TransactionEnded, for instance)
// Doom anything remotely involved.
if (null != connection)
{
connection.DoomThisConnection();
}
if (connection != _connection && null != _connection)
{
_connection.DoomThisConnection();
}
throw ADP.InternalError(ADP.InternalErrorCode.UnpooledObjectHasWrongOwner); //TODO: Create a new code
}
}
// Event notification that transaction ended. This comes from the subscription to the Transaction's
// ended event via the internal connection. If it occurs without a prior Rollback or SinglePhaseCommit call,
// it indicates the transaction was ended externally (generally that one of the DTC participants aborted
// the transaction).
internal void TransactionEnded(Transaction transaction)
{
SqlInternalConnection connection = _connection;
if (connection != null)
{
lock (connection)
{
if (_atomicTransaction.Equals(transaction))
{
// No need to validate active on connection, this operation can be called on completed transactions
_active = false;
_connection = null;
}
// Safest approach is to doom this connection, whose transaction has been aborted externally.
// If we want to avoid dooming the connection for performance, state needs to be properly restored. (future TODO)
connection.DoomThisConnection();
}
}
}
public void Initialize()
{
SqlInternalConnection innerConnection = this._connection;
SqlConnection connection = innerConnection.Connection;
Bid.Trace("<sc.SqlDelegatedTransaction.Initialize|RES|CPOOL> %d#, Connection %d#, delegating transaction.\n", this.ObjectID, innerConnection.ObjectID);
RuntimeHelpers.PrepareConstrainedRegions();
try
{
if (innerConnection.IsEnlistedInTransaction)
{
Bid.Trace("<sc.SqlDelegatedTransaction.Initialize|RES|CPOOL> %d#, Connection %d#, was enlisted, now defecting.\n", this.ObjectID, innerConnection.ObjectID);
innerConnection.EnlistNull();
}
this._internalTransaction = new SqlInternalTransaction(innerConnection, TransactionType.Delegated, null);
innerConnection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Begin, null, this._isolationLevel, this._internalTransaction, true);
if (innerConnection.CurrentTransaction == null)
{
innerConnection.DoomThisConnection();
throw ADP.InternalError(ADP.InternalErrorCode.UnknownTransactionFailure);
}
this._active = true;
}
catch (OutOfMemoryException exception3)
{
connection.Abort(exception3);
throw;
}
catch (StackOverflowException exception2)
{
connection.Abort(exception2);
throw;
}
catch (ThreadAbortException exception)
{
connection.Abort(exception);
throw;
}
}
// Called by the transaction to initiate commit sequence
public void SinglePhaseCommit(SinglePhaseEnlistment enlistment)
{
Debug.Assert(null != enlistment, "null enlistment?");
SqlInternalConnection connection = GetValidConnection();
SqlConnection usersConnection = connection.Connection;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
// If the connection is dooomed, we can be certain that the
// transaction will eventually be rolled back, and we shouldn't
// attempt to commit it.
if (connection.IsConnectionDoomed)
{
lock (connection)
{
_active = false; // set to inactive first, doesn't matter how the rest completes, this transaction is done.
_connection = null;
}
enlistment.Aborted(SQL.ConnectionDoomed());
}
else
{
Exception commitException;
lock (connection)
{
try
{
// Now that we've acquired the lock, make sure we still have valid state for this operation.
ValidateActiveOnConnection(connection);
_active = false; // set to inactive first, doesn't matter how the rest completes, this transaction is done.
_connection = null; // Set prior to ExecuteTransaction call in case this initiates a TransactionEnd event
connection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Commit, null, IsolationLevel.Unspecified, _internalTransaction, true);
commitException = null;
}
catch (SqlException e)
{
commitException = e;
// Doom the connection, to make sure that the transaction is
// eventually rolled back.
// VSTS 144562: doom the connection while having the lock on it to prevent race condition with "Transaction Ended" Event
connection.DoomThisConnection();
}
catch (InvalidOperationException e)
{
commitException = e;
connection.DoomThisConnection();
}
}
if (commitException != null)
{
// connection.ExecuteTransaction failed with exception
if (_internalTransaction.IsCommitted)
{
// Even though we got an exception, the transaction
// was committed by the server.
enlistment.Committed();
}
else if (_internalTransaction.IsAborted)
{
// The transaction was aborted, report that to
// SysTx.
enlistment.Aborted(commitException);
}
else
{
// The transaction is still active, we cannot
// know the state of the transaction.
enlistment.InDoubt(commitException);
}
// We eat the exception. This is called on the SysTx
// thread, not the applications thread. If we don't
// eat the exception an UnhandledException will occur,
// causing the process to FailFast.
}
connection.CleanupConnectionOnTransactionCompletion(_atomicTransaction);
if (commitException == null)
{
// connection.ExecuteTransaction succeeded
enlistment.Committed();
}
}
}
catch (System.OutOfMemoryException e)
{
usersConnection.Abort(e);
throw;
}
catch (System.StackOverflowException e)
{
usersConnection.Abort(e);
throw;
}
catch (System.Threading.ThreadAbortException e)
{
usersConnection.Abort(e);
throw;
}
}
// Called by transaction to initiate abort sequence
public void Rollback(SinglePhaseEnlistment enlistment)
{
Debug.Assert(null != enlistment, "null enlistment?");
SqlInternalConnection connection = GetValidConnection();
SqlConnection usersConnection = connection.Connection;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
lock (connection)
{
try
{
// Now that we've acquired the lock, make sure we still have valid state for this operation.
ValidateActiveOnConnection(connection);
_active = false; // set to inactive first, doesn't matter how the execute completes, this transaction is done.
_connection = null; // Set prior to ExecuteTransaction call in case this initiates a TransactionEnd event
// If we haven't already rolled back (or aborted) then tell the SQL Server to roll back
if (!_internalTransaction.IsAborted)
{
connection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Rollback, null, IsolationLevel.Unspecified, _internalTransaction, true);
}
}
catch (SqlException)
{
// Doom the connection, to make sure that the transaction is
// eventually rolled back.
// VSTS 144562: doom the connection while having the lock on it to prevent race condition with "Transaction Ended" Event
connection.DoomThisConnection();
// Unlike SinglePhaseCommit, a rollback is a rollback, regardless
// of how it happens, so SysTx won't throw an exception, and we
// don't want to throw an exception either, because SysTx isn't
// handling it and it may create a fail fast scenario. In the end,
// there is no way for us to communicate to the consumer that this
// failed for more serious reasons than usual.
//
// This is a bit like "should you throw if Close fails", however,
// it only matters when you really need to know. In that case,
// we have the tracing that we're doing to fallback on for the
// investigation.
}
catch (InvalidOperationException)
{
connection.DoomThisConnection();
}
}
// it doesn't matter whether the rollback succeeded or not, we presume
// that the transaction is aborted, because it will be eventually.
connection.CleanupConnectionOnTransactionCompletion(_atomicTransaction);
enlistment.Aborted();
}
catch (System.OutOfMemoryException e)
{
usersConnection.Abort(e);
throw;
}
catch (System.StackOverflowException e)
{
usersConnection.Abort(e);
throw;
}
catch (System.Threading.ThreadAbortException e)
{
usersConnection.Abort(e);
throw;
}
}
public byte[] Promote()
{
// Operations that might be affected by multi-threaded use MUST be done inside the lock.
// Don't read values off of the connection outside the lock unless it doesn't really matter
// from an operational standpoint (i.e. logging connection's ObjectID should be fine,
// but the PromotedDTCToken can change over calls. so that must be protected).
SqlInternalConnection connection = GetValidConnection();
Exception promoteException;
byte[] returnValue = null;
SqlConnection usersConnection = connection.Connection;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
lock (connection)
{
try
{
// Now that we've acquired the lock, make sure we still have valid state for this operation.
ValidateActiveOnConnection(connection);
connection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Promote, null, IsolationLevel.Unspecified, _internalTransaction, true);
returnValue = _connection.PromotedDTCToken;
// For Global Transactions, we need to set the Transaction Id since we use a Non-MSDTC Promoter type.
if (_connection.IsGlobalTransaction)
{
if (SysTxForGlobalTransactions.SetDistributedTransactionIdentifier == null)
{
throw SQL.UnsupportedSysTxForGlobalTransactions();
}
if (!_connection.IsGlobalTransactionsEnabledForServer)
{
throw SQL.GlobalTransactionsNotEnabled();
}
SysTxForGlobalTransactions.SetDistributedTransactionIdentifier.Invoke(_atomicTransaction, new object[] { this, GetGlobalTxnIdentifierFromToken() });
}
promoteException = null;
}
catch (SqlException e)
{
promoteException = e;
// Doom the connection, to make sure that the transaction is
// eventually rolled back.
// VSTS 144562: doom the connection while having the lock on it to prevent race condition with "Transaction Ended" Event
connection.DoomThisConnection();
}
catch (InvalidOperationException e)
{
promoteException = e;
connection.DoomThisConnection();
}
}
}
catch (System.OutOfMemoryException e)
{
usersConnection.Abort(e);
throw;
}
catch (System.StackOverflowException e)
{
usersConnection.Abort(e);
throw;
}
catch (System.Threading.ThreadAbortException e)
{
usersConnection.Abort(e);
throw;
}
if (promoteException != null)
{
throw SQL.PromotionFailed(promoteException);
}
return(returnValue);
}
// Dooms connection and throws and error if not a valid, active, delegated transaction for the given
// connection. Designed to be called AFTER a lock is placed on the connection, otherwise a normal return
// may not be trusted.
private void ValidateActiveOnConnection(SqlInternalConnection connection) {
bool valid = _active && (connection == _connection) && (connection.DelegatedTransaction == this);
if (!valid) {
// Invalid indicates something BAAAD happened (Commit after TransactionEnded, for instance)
// Doom anything remotely involved.
if (null != connection) {
connection.DoomThisConnection();
}
if (connection != _connection && null != _connection) {
_connection.DoomThisConnection();
}
throw ADP.InternalError(ADP.InternalErrorCode.UnpooledObjectHasWrongOwner); //
}
}
public Byte [] Promote()
{
// Operations that might be affected by multi-threaded use MUST be done inside the lock.
// Don't read values off of the connection outside the lock unless it doesn't really matter
// from an operational standpoint (i.e. logging connection's ObjectID should be fine,
// but the PromotedDTCToken can change over calls. so that must be protected).
SqlInternalConnection connection = GetValidConnection();
Exception promoteException;
byte[] returnValue = null;
SqlConnection usersConnection = connection.Connection;
Bid.Trace("<sc.SqlDelegatedTransaction.Promote|RES|CPOOL> %d#, Connection %d#, promoting transaction.\n", ObjectID, connection.ObjectID);
RuntimeHelpers.PrepareConstrainedRegions();
try {
#if DEBUG
TdsParser.ReliabilitySection tdsReliabilitySection = new TdsParser.ReliabilitySection();
RuntimeHelpers.PrepareConstrainedRegions();
try {
tdsReliabilitySection.Start();
#else
{
#endif //DEBUG
lock (connection) {
try {
// Now that we've acquired the lock, make sure we still have valid state for this operation.
ValidateActiveOnConnection(connection);
connection.ExecuteTransaction(SqlInternalConnection.TransactionRequest.Promote, null, IsolationLevel.Unspecified, _internalTransaction, true);
returnValue = _connection.PromotedDTCToken;
promoteException = null;
}
catch (SqlException e) {
promoteException = e;
ADP.TraceExceptionWithoutRethrow(e);
// Doom the connection, to make sure that the transaction is
// eventually rolled back.
// VSTS 144562: doom the connection while having the lock on it to prevent race condition with "Transaction Ended" Event
connection.DoomThisConnection();
}
catch (InvalidOperationException e)
{
promoteException = e;
ADP.TraceExceptionWithoutRethrow(e);
connection.DoomThisConnection();
}
}
}
#if DEBUG
finally {
tdsReliabilitySection.Stop();
}
#endif //DEBUG
}
catch (System.OutOfMemoryException e) {
usersConnection.Abort(e);
throw;
}
catch (System.StackOverflowException e) {
usersConnection.Abort(e);
throw;
}
catch (System.Threading.ThreadAbortException e) {
usersConnection.Abort(e);
throw;
}
if (promoteException != null)
{
throw SQL.PromotionFailed(promoteException);
}
return(returnValue);
}
private void ValidateActiveOnConnection(SqlInternalConnection connection)
{
if ((!this._active || (connection != this._connection)) || (connection.DelegatedTransaction != this))
{
if (connection != null)
{
connection.DoomThisConnection();
}
if ((connection != this._connection) && (this._connection != null))
{
this._connection.DoomThisConnection();
}
throw ADP.InternalError(ADP.InternalErrorCode.UnpooledObjectHasWrongOwner);
}
}
