| public EnlistPromotableSinglePhase ( IPromotableSinglePhaseNotification promotableSinglePhaseNotification ) : bool | ||
| promotableSinglePhaseNotification | IPromotableSinglePhaseNotification | The object that implements the IPromotableSinglePhaseNotification interface. |
| Результат | bool | |
private void Enlist(Transaction transaction)
{
if (transaction == null)
{
// no enlistment as we are not in a TransactionScope
return;
}
// try to enlist as a PSPE
if (!transaction.EnlistPromotableSinglePhase(this))
{
// our enlistmente fail so we need to enlist ourselves as durable.
// we create a transaction directly instead of using BeginTransaction that GraphClient
// doesn't store it in its stack of scopes.
var localTransaction = new Neo4jTransaction(_client);
localTransaction.ForceKeepAlive();
_transactionId = localTransaction.Id;
var resourceManager = GetResourceManager();
var propagationToken = TransactionInterop.GetTransmitterPropagationToken(transaction);
var transactionExecutionEnvironment = new TransactionExecutionEnvironment(_client.ExecutionConfiguration)
{
TransactionId = localTransaction.Id,
TransactionBaseEndpoint = _client.TransactionEndpoint
};
resourceManager.Enlist(transactionExecutionEnvironment, propagationToken);
localTransaction.Cancel();
}
_enlistedInTransactions.Add(transaction);
}
/// <summary>
/// Instantiate an opened connection enlisted to the Transaction
/// if promotable is false, the Transaction wraps a local
/// transaction inside and can never be promoted
/// </summary>
/// <param name="dbResourceAllocator"></param>
/// <param name="transaction"></param>
/// <param name="wantPromotable"></param>
internal SharedConnectionInfo(
DbResourceAllocator dbResourceAllocator,
Transaction transaction,
bool wantPromotable,
ManualResetEvent handle)
{
Debug.Assert((transaction != null), "Null Transaction!");
if (null == handle)
throw new ArgumentNullException("handle");
this.handle = handle;
if (wantPromotable)
{
// Enlist a newly opened connection to this regular Transaction
this.connection = dbResourceAllocator.OpenNewConnection();
this.connection.EnlistTransaction(transaction);
}
else
{
// Make this transaction no longer promotable by attaching our
// IPromotableSinglePhaseNotification implementation (LocalTranscaction)
// and track the DbConnection and DbTransaction associated with the LocalTranscaction
LocalTransaction localTransaction = new LocalTransaction(dbResourceAllocator, handle);
transaction.EnlistPromotableSinglePhase(localTransaction);
this.connection = localTransaction.Connection;
this.localTransaction = localTransaction.Transaction;
}
}
internal SharedConnectionInfo(DbResourceAllocator dbResourceAllocator, Transaction transaction, bool wantPromotable, ManualResetEvent handle)
{
if (handle == null)
{
throw new ArgumentNullException("handle");
}
this.handle = handle;
if (wantPromotable)
{
this.connection = dbResourceAllocator.OpenNewConnection();
this.connection.EnlistTransaction(transaction);
}
else
{
LocalTransaction promotableSinglePhaseNotification = new LocalTransaction(dbResourceAllocator, handle);
transaction.EnlistPromotableSinglePhase(promotableSinglePhaseNotification);
this.connection = promotableSinglePhaseNotification.Connection;
this.localTransaction = promotableSinglePhaseNotification.Transaction;
}
}
public void Enlist(Transaction tx)
{
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;
}
}
}
async Task<byte[]> EnlistAsync(Link link, Transaction txn)
{
string id = txn.TransactionInformation.LocalIdentifier;
Enlistment enlistment;
lock (this.SyncRoot)
{
if (!this.enlistments.TryGetValue(id, out enlistment))
{
enlistment = new Enlistment(this, txn);
this.enlistments.Add(id, enlistment);
txn.TransactionCompleted += this.OnTransactionCompleted;
if (!txn.EnlistPromotableSinglePhase(enlistment))
{
this.enlistments.Remove(id);
txn.TransactionCompleted -= this.OnTransactionCompleted;
throw new InvalidOperationException("DTC not supported");
}
}
}
return await enlistment.EnlistAsync(link);
}
/// <summary>
/// Enlists in the specified transaction.
/// </summary>
/// <param name="transaction">
/// A reference to an existing <see cref="System.Transactions.Transaction"/> in which to enlist.
/// </param>
public override void EnlistTransaction(Transaction transaction)
{
// enlisting in the null transaction is a noop
if (transaction == null)
return;
// guard against trying to enlist in more than one transaction
if (driver.CurrentTransaction != null)
{
if (driver.CurrentTransaction.BaseTransaction == transaction)
return;
throw new MySqlException("Already enlisted");
}
// now see if we need to swap out drivers. We would need to do this since
// we have to make sure all ops for a given transaction are done on the
// same physical connection.
Driver existingDriver = DriverTransactionManager.GetDriverInTransaction(transaction);
if (existingDriver != null)
{
// we can't allow more than one driver to contribute to the same connection
if (existingDriver.IsInActiveUse)
throw new NotSupportedException(Resources.MultipleConnectionsInTransactionNotSupported);
// there is an existing driver and it's not being currently used.
// now we need to see if it is using the same connection string
string text1 = existingDriver.Settings.GetConnectionString(true);
string text2 = Settings.GetConnectionString(true);
if (String.Compare(text1, text2, true) != 0)
throw new NotSupportedException(Resources.MultipleConnectionsInTransactionNotSupported);
// close existing driver
// set this new driver as our existing driver
CloseFully();
driver = existingDriver;
}
if (driver.CurrentTransaction == null)
{
MySqlPromotableTransaction t = new MySqlPromotableTransaction(this, transaction);
if (!transaction.EnlistPromotableSinglePhase(t))
throw new NotSupportedException(Resources.DistributedTxnNotSupported);
driver.CurrentTransaction = t;
DriverTransactionManager.SetDriverInTransaction(driver);
driver.IsInActiveUse = true;
}
}
private void EnlistNonNull(SysTx.Transaction tx)
{
Debug.Assert(null != tx, "null transaction?");
SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.SqlInternalConnection.EnlistNonNull|ADV> {0}, transaction {1}.", ObjectID, tx.GetHashCode());
bool hasDelegatedTransaction = false;
if (Is2005OrNewer)
{
SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.SqlInternalConnection.EnlistNonNull|ADV> {0}, attempting to delegate", ObjectID);
// Promotable transactions are only supported on 2005
// servers or newer.
SqlDelegatedTransaction delegatedTransaction = new SqlDelegatedTransaction(this, tx);
try
{
// NOTE: System.Transactions claims to resolve all
// potential race conditions between multiple delegate
// requests of the same transaction to different
// connections in their code, such that only one
// attempt to delegate will succeed.
// NOTE: PromotableSinglePhaseEnlist will eventually
// make a round trip to the server; doing this inside
// a lock is not the best choice. We presume that you
// aren't trying to enlist concurrently on two threads
// and leave it at that -- We don't claim any thread
// safety with regard to multiple concurrent requests
// to enlist the same connection in different
// transactions, which is good, because we don't have
// it anyway.
// PromotableSinglePhaseEnlist may not actually promote
// the transaction when it is already delegated (this is
// the way they resolve the race condition when two
// threads attempt to delegate the same Lightweight
// Transaction) In that case, we can safely ignore
// our delegated transaction, and proceed to enlist
// in the promoted one.
// NOTE: Global Transactions is an Azure SQL DB only
// feature where the Transaction Manager (TM) is not
// MS-DTC. Sys.Tx added APIs to support Non MS-DTC
// promoter types/TM in .NET 4.6.1. Following directions
// from .NETFX shiproom, to avoid a "hard-dependency"
// (compile time) on Sys.Tx, we use reflection to invoke
// the new APIs. Further, the _isGlobalTransaction flag
// indicates that this is an Azure SQL DB Transaction
// that could be promoted to a Global Transaction (it's
// always false for on-prem Sql Server). The Promote()
// call in SqlDelegatedTransaction makes sure that the
// right Sys.Tx.dll is loaded and that Global Transactions
// are actually allowed for this Azure SQL DB.
if (_isGlobalTransaction)
{
if (SysTxForGlobalTransactions.EnlistPromotableSinglePhase == null)
{
// This could be a local Azure SQL DB transaction.
hasDelegatedTransaction = tx.EnlistPromotableSinglePhase(delegatedTransaction);
}
else
{
hasDelegatedTransaction = (bool)SysTxForGlobalTransactions.EnlistPromotableSinglePhase.Invoke(tx, new object[] { delegatedTransaction, _globalTransactionTMID });
}
}
else
{
// This is an MS-DTC distributed transaction
hasDelegatedTransaction = tx.EnlistPromotableSinglePhase(delegatedTransaction);
}
if (hasDelegatedTransaction)
{
this.DelegatedTransaction = delegatedTransaction;
SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.SqlInternalConnection.EnlistNonNull|ADV> {0}, delegated to transaction {1} with transactionId=0x{2}", ObjectID, null != CurrentTransaction ? CurrentTransaction.ObjectID : 0, null != CurrentTransaction ? CurrentTransaction.TransactionId : SqlInternalTransaction.NullTransactionId);
}
}
catch (SqlException e)
{
// we do not want to eat the error if it is a fatal one
if (e.Class >= TdsEnums.FATAL_ERROR_CLASS)
{
throw;
}
// if the parser is null or its state is not openloggedin, the connection is no longer good.
SqlInternalConnectionTds tdsConnection = this as SqlInternalConnectionTds;
if (tdsConnection != null)
{
TdsParser parser = tdsConnection.Parser;
if (parser == null || parser.State != TdsParserState.OpenLoggedIn)
{
throw;
}
}
ADP.TraceExceptionWithoutRethrow(e);
// In this case, SqlDelegatedTransaction.Initialize
// failed and we don't necessarily want to reject
// things -- there may have been a legitimate reason
// for the failure.
}
}
if (!hasDelegatedTransaction)
{
SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.SqlInternalConnection.EnlistNonNull|ADV> {0}, delegation not possible, enlisting.", ObjectID);
byte[] cookie = null;
if (_isGlobalTransaction)
{
if (SysTxForGlobalTransactions.GetPromotedToken == null)
{
throw SQL.UnsupportedSysTxForGlobalTransactions();
}
cookie = (byte[])SysTxForGlobalTransactions.GetPromotedToken.Invoke(tx, null);
}
else
{
if (null == _whereAbouts)
{
byte[] dtcAddress = GetDTCAddress();
if (null == dtcAddress)
{
throw SQL.CannotGetDTCAddress();
}
_whereAbouts = dtcAddress;
}
cookie = GetTransactionCookie(tx, _whereAbouts);
}
// send cookie to server to finish enlistment
PropagateTransactionCookie(cookie);
_isEnlistedInTransaction = true;
SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.SqlInternalConnection.EnlistNonNull|ADV> {0}, enlisted with transaction {1} with transactionId=0x{2}", ObjectID, null != CurrentTransaction ? CurrentTransaction.ObjectID : 0, null != CurrentTransaction ? CurrentTransaction.TransactionId : SqlInternalTransaction.NullTransactionId);
}
EnlistedTransaction = tx; // Tell the base class about our enlistment
// If we're on a 2005 or newer server, and we we delegate the
// transaction successfully, we will have done a begin transaction,
// which produces a transaction id that we should execute all requests
// on. The TdsParser or SmiEventSink will store this information as
// the current transaction.
//
// Likewise, propagating a transaction to a 2005 or newer server will
// produce a transaction id that The TdsParser or SmiEventSink will
// store as the current transaction.
//
// In either case, when we're working with a 2005 or newer server
// we better have a current transaction by now.
Debug.Assert(!Is2005OrNewer || null != CurrentTransaction, "delegated/enlisted transaction with null current transaction?");
}
public override void EnlistTransaction( Transaction transaction ) {
if( transaction != null ) {
if( this.driver.CurrentTransaction != null ) {
if( this.driver.CurrentTransaction.BaseTransaction != transaction ) {
throw new MySqlException( "Already enlisted" );
}
} else {
Driver driverInTransaction = DriverTransactionManager.GetDriverInTransaction( transaction );
if( driverInTransaction != null ) {
if( driverInTransaction.IsInActiveUse ) {
throw new NotSupportedException( Resources.MultipleConnectionsInTransactionNotSupported );
}
string connectionString = driverInTransaction.Settings.GetConnectionString( true );
string strB = this.Settings.GetConnectionString( true );
if( string.Compare( connectionString, strB, true ) != 0 ) {
throw new NotSupportedException( Resources.MultipleConnectionsInTransactionNotSupported );
}
this.CloseFully();
this.driver = driverInTransaction;
}
if( this.driver.CurrentTransaction == null ) {
MySqlPromotableTransaction promotableSinglePhaseNotification = new MySqlPromotableTransaction( this, transaction );
if( !transaction.EnlistPromotableSinglePhase( promotableSinglePhaseNotification ) ) {
throw new NotSupportedException( Resources.DistributedTxnNotSupported );
}
this.driver.CurrentTransaction = promotableSinglePhaseNotification;
DriverTransactionManager.SetDriverInTransaction( this.driver );
this.driver.IsInActiveUse = true;
}
}
}
}
private void EnlistNonNull(SysTx.Transaction tx)
{
Debug.Assert(null != tx, "null transaction?");
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, transaction %d#.\n", base.ObjectID, tx.GetHashCode());
}
bool hasDelegatedTransaction = false;
if (IsYukonOrNewer)
{
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, attempting to delegate\n", base.ObjectID);
}
// Promotable transactions are only supported on Yukon
// servers or newer.
SqlDelegatedTransaction delegatedTransaction = new SqlDelegatedTransaction(this, tx);
try {
// NOTE: System.Transactions claims to resolve all
// potential race conditions between multiple delegate
// requests of the same transaction to different
// connections in their code, such that only one
// attempt to delegate will succeed.
// NOTE: PromotableSinglePhaseEnlist will eventually
// make a round trip to the server; doing this inside
// a lock is not the best choice. We presume that you
// aren't trying to enlist concurrently on two threads
// and leave it at that -- We don't claim any thread
// safety with regard to multiple concurrent requests
// to enlist the same connection in different
// transactions, which is good, because we don't have
// it anyway.
// PromotableSinglePhaseEnlist may not actually promote
// the transaction when it is already delegated (this is
// the way they resolve the race condition when two
// threads attempt to delegate the same Lightweight
// Transaction) In that case, we can safely ignore
// our delegated transaction, and proceed to enlist
// in the promoted one.
if (tx.EnlistPromotableSinglePhase(delegatedTransaction))
{
hasDelegatedTransaction = true;
this.DelegatedTransaction = delegatedTransaction;
if (Bid.AdvancedOn)
{
long transactionId = SqlInternalTransaction.NullTransactionId;
int transactionObjectID = 0;
if (null != CurrentTransaction)
{
transactionId = CurrentTransaction.TransactionId;
transactionObjectID = CurrentTransaction.ObjectID;
}
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, delegated to transaction %d# with transactionId=0x%I64x\n", base.ObjectID, transactionObjectID, transactionId);
}
}
}
catch (SqlException e) {
// we do not want to eat the error if it is a fatal one
if (e.Class >= TdsEnums.FATAL_ERROR_CLASS)
{
throw;
}
// if the parser is null or its state is not openloggedin, the connection is no longer good.
SqlInternalConnectionTds tdsConnection = this as SqlInternalConnectionTds;
if (tdsConnection != null)
{
TdsParser parser = tdsConnection.Parser;
if (parser == null || parser.State != TdsParserState.OpenLoggedIn)
{
throw;
}
}
ADP.TraceExceptionWithoutRethrow(e);
// In this case, SqlDelegatedTransaction.Initialize
// failed and we don't necessarily want to reject
// things -- there may have been a legitimate reason
// for the failure.
}
}
if (!hasDelegatedTransaction)
{
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, delegation not possible, enlisting.\n", base.ObjectID);
}
byte[] cookie = null;
if (null == _whereAbouts)
{
byte[] dtcAddress = GetDTCAddress();
if (null == dtcAddress)
{
throw SQL.CannotGetDTCAddress();
}
_whereAbouts = dtcAddress;
}
cookie = GetTransactionCookie(tx, _whereAbouts);
// send cookie to server to finish enlistment
PropagateTransactionCookie(cookie);
_isEnlistedInTransaction = true;
if (Bid.AdvancedOn)
{
long transactionId = SqlInternalTransaction.NullTransactionId;
int transactionObjectID = 0;
if (null != CurrentTransaction)
{
transactionId = CurrentTransaction.TransactionId;
transactionObjectID = CurrentTransaction.ObjectID;
}
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, enlisted with transaction %d# with transactionId=0x%I64x\n", base.ObjectID, transactionObjectID, transactionId);
}
}
EnlistedTransaction = tx; // Tell the base class about our enlistment
// If we're on a Yukon or newer server, and we we delegate the
// transaction successfully, we will have done a begin transaction,
// which produces a transaction id that we should execute all requests
// on. The TdsParser or SmiEventSink will store this information as
// the current transaction.
//
// Likewise, propagating a transaction to a Yukon or newer server will
// produce a transaction id that The TdsParser or SmiEventSink will
// store as the current transaction.
//
// In either case, when we're working with a Yukon or newer server
// we better have a current transaction by now.
Debug.Assert(!IsYukonOrNewer || null != CurrentTransaction, "delegated/enlisted transaction with null current transaction?");
}
public override void EnlistTransaction(Transaction systemTransaction)
{
lock (m_syncRoot)
{
CheckClosed();
if (systemTransaction == null)
{
throw new ArgumentNullException("transaction");
}
HsqlEnlistment enlistment = m_enlistment;
if (enlistment == null)
{
enlistment = new HsqlEnlistment(this, systemTransaction);
if (!systemTransaction.EnlistPromotableSinglePhase(enlistment))
{
if (m_transaction == null)
{
BeginTransaction(HsqlConvert.ToIsolationLevel(systemTransaction.IsolationLevel));
}
enlistment.m_dbTransaction = m_transaction;
systemTransaction.EnlistDurable(enlistment.Rmid, enlistment, EnlistmentOptions.None);
}
m_enlistment = enlistment;
GC.KeepAlive(this);
}
else if (enlistment.Transaction != systemTransaction)
{
throw new InvalidOperationException(
"Connection currently has transaction enlisted."
+ " Finish current transaction and retry."); // NOI18N
}
}
}
private void EnlistNonNull(Transaction tx)
{
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, transaction %d#.\n", base.ObjectID, tx.GetHashCode());
}
bool flag = false;
if (this.IsYukonOrNewer)
{
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, attempting to delegate\n", base.ObjectID);
}
SqlDelegatedTransaction promotableSinglePhaseNotification = new SqlDelegatedTransaction(this, tx);
try
{
if (tx.EnlistPromotableSinglePhase(promotableSinglePhaseNotification))
{
flag = true;
this.DelegatedTransaction = promotableSinglePhaseNotification;
if (Bid.AdvancedOn)
{
long transactionId = 0L;
int objectID = 0;
if (this.CurrentTransaction != null)
{
transactionId = this.CurrentTransaction.TransactionId;
objectID = this.CurrentTransaction.ObjectID;
}
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, delegated to transaction %d# with transactionId=0x%I64x\n", base.ObjectID, objectID, transactionId);
}
}
}
catch (SqlException exception)
{
if (exception.Class >= 20)
{
throw;
}
SqlInternalConnectionTds tds = this as SqlInternalConnectionTds;
if (tds != null)
{
TdsParser parser = tds.Parser;
if ((parser == null) || (parser.State != TdsParserState.OpenLoggedIn))
{
throw;
}
}
ADP.TraceExceptionWithoutRethrow(exception);
}
}
if (!flag)
{
if (Bid.AdvancedOn)
{
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, delegation not possible, enlisting.\n", base.ObjectID);
}
byte[] transactionCookie = null;
if (this._whereAbouts == null)
{
byte[] dTCAddress = this.GetDTCAddress();
if (dTCAddress == null)
{
throw SQL.CannotGetDTCAddress();
}
this._whereAbouts = dTCAddress;
}
transactionCookie = GetTransactionCookie(tx, this._whereAbouts);
this.PropagateTransactionCookie(transactionCookie);
this._isEnlistedInTransaction = true;
if (Bid.AdvancedOn)
{
long num2 = 0L;
int num = 0;
if (this.CurrentTransaction != null)
{
num2 = this.CurrentTransaction.TransactionId;
num = this.CurrentTransaction.ObjectID;
}
Bid.Trace("<sc.SqlInternalConnection.EnlistNonNull|ADV> %d#, enlisted with transaction %d# with transactionId=0x%I64x\n", base.ObjectID, num, num2);
}
}
base.EnlistedTransaction = tx;
}