public void A_subscription_entry_should_be_added_to_the_database()
{
var messageTypes = new[] { new MessageType(typeof(MessageA)), new MessageType(typeof(MessageB)) };
using (var transaction = new TransactionScope())
{
storage.Subscribe(TestClients.ClientA, messageTypes);
transaction.Complete();
}
using (var session = subscriptionStorageSessionProvider.OpenSession())
{
var subscriptions = session.CreateCriteria(typeof(Subscription)).List<Subscription>();
Assert.AreEqual(subscriptions.Count, 2);
}
}
private bool _active; // Is the transaction active?
internal SqlDelegatedTransaction(SqlInternalConnection connection, SysTx.Transaction tx) {
Debug.Assert(null != connection, "null connection?");
_connection = connection;
_atomicTransaction = tx;
_active = false;
SysTx.IsolationLevel systxIsolationLevel = tx.IsolationLevel;
// We need to map the System.Transactions IsolationLevel to the one
// that System.Data uses and communicates to SqlServer. We could
// arguably do that in Initialize when the transaction is delegated,
// however it is better to do this before we actually begin the process
// of delegation, in case System.Transactions adds another isolation
// level we don't know about -- we can throw the exception at a better
// place.
switch (systxIsolationLevel) {
case SysTx.IsolationLevel.ReadCommitted: _isolationLevel = IsolationLevel.ReadCommitted; break;
case SysTx.IsolationLevel.ReadUncommitted: _isolationLevel = IsolationLevel.ReadUncommitted; break;
case SysTx.IsolationLevel.RepeatableRead: _isolationLevel = IsolationLevel.RepeatableRead; break;
case SysTx.IsolationLevel.Serializable: _isolationLevel = IsolationLevel.Serializable; break;
case SysTx.IsolationLevel.Snapshot: _isolationLevel = IsolationLevel.Snapshot; break;
default:
throw SQL.UnknownSysTxIsolationLevel(systxIsolationLevel);
}
}
// 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 the the DTC participants aborted
// the transaction).
internal void TransactionEnded(SysTx.Transaction transaction) {
SqlInternalConnection connection = _connection;
if (connection != null) {
Bid.Trace("<sc.SqlDelegatedTransaction.TransactionEnded|RES|CPOOL> %d#, Connection %d#, transaction completed externally.\n", ObjectID, connection.ObjectID);
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;
}
}
}
}
// Called by the transaction to initiate commit sequence
public void SinglePhaseCommit(SysTx.SinglePhaseEnlistment enlistment) {
Debug.Assert(null != enlistment, "null enlistment?");
SqlInternalConnection connection = GetValidConnection();
SqlConnection usersConnection = connection.Connection;
Bid.Trace("<sc.SqlDelegatedTransaction.SinglePhaseCommit|RES|CPOOL> %d#, Connection %d#, committing 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 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;
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) {
commitException = e;
ADP.TraceExceptionWithoutRethrow(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();
}
}
}
#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;
}
}
// Called by transaction to initiate abort sequence
public void Rollback(SysTx.SinglePhaseEnlistment enlistment) {
Debug.Assert(null != enlistment, "null enlistment?");
SqlInternalConnection connection = GetValidConnection();
SqlConnection usersConnection = connection.Connection;
Bid.Trace("<sc.SqlDelegatedTransaction.Rollback|RES|CPOOL> %d#, Connection %d#, aborting 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);
_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 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();
// 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 e) {
ADP.TraceExceptionWithoutRethrow(e);
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();
}
#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;
}
}
internal void GetCurrentTransactionPair(out long transactionId, out SysTx.Transaction transaction) {
// SQLBU 214740: Transaction state could change between obtaining tranid and transaction
// due to background SqlDelegatedTransaction processing. Lock the connection to prevent that.
lock (this) {
transactionId = (null != CurrentTransaction) ? CurrentTransaction.TransactionId : 0;
transaction = null;
if (0 != transactionId) {
transaction = InternalEnlistedTransaction;
}
}
}
override protected void Activate(SysTx.Transaction transaction)
{
Debug.Assert(false, "Activating an internal SMI connection?"); // we should never be activating, because that would indicate we're being pooled.
}
