internal DurableInternalEnlistment(
Enlistment enlistment,
Guid resourceManagerIdentifier,
InternalTransaction transaction,
IEnlistmentNotification twoPhaseNotifications,
ISinglePhaseNotification singlePhaseNotifications,
Transaction atomicTransaction) :
base(enlistment, transaction, twoPhaseNotifications, singlePhaseNotifications, atomicTransaction)
{
_resourceManagerIdentifier = resourceManagerIdentifier;
}
internal InternalEnlistment(
Enlistment enlistment,
IEnlistmentNotification twoPhaseNotifications,
InternalTransaction transaction,
Transaction atomicTransaction)
{
_enlistment = enlistment;
_twoPhaseNotifications = twoPhaseNotifications;
_transaction = transaction;
_atomicTransaction = atomicTransaction;
}
internal Enlistment(
IEnlistmentNotification twoPhaseNotifications,
InternalTransaction transaction,
Transaction atomicTransaction)
{
_internalEnlistment = new InternalEnlistment(
this,
twoPhaseNotifications,
transaction,
atomicTransaction
);
}
// This constructor is for a promotable single phase enlistment.
internal Enlistment(
InternalTransaction transaction,
IPromotableSinglePhaseNotification promotableSinglePhaseNotification,
Transaction atomicTransaction)
{
_internalEnlistment = new PromotableInternalEnlistment(
this,
transaction,
promotableSinglePhaseNotification,
atomicTransaction
);
}
internal static void DistributedTransactionOutcome(InternalTransaction tx, TransactionStatus status)
{
FinalizedObject fo = null;
lock (tx)
{
if (null == tx._innerException)
{
tx._innerException = tx.PromotedTransaction.InnerException;
}
switch (status)
{
case TransactionStatus.Committed:
{
tx.State.ChangeStatePromotedCommitted(tx);
break;
}
case TransactionStatus.Aborted:
{
tx.State.ChangeStatePromotedAborted(tx);
break;
}
case TransactionStatus.InDoubt:
{
tx.State.InDoubtFromDtc(tx);
break;
}
default:
{
Debug.Assert(false, "InternalTransaction.DistributedTransactionOutcome - Unexpected TransactionStatus");
TransactionException.CreateInvalidOperationException(TraceSourceType.TraceSourceLtm,
"",
null,
tx.DistributedTxId
);
break;
}
}
fo = tx._finalizedObject;
}
if (null != fo)
{
fo.Dispose();
}
}
internal InternalEnlistment(
Enlistment enlistment,
InternalTransaction transaction,
IEnlistmentNotification twoPhaseNotifications,
ISinglePhaseNotification singlePhaseNotifications,
Transaction atomicTransaction)
{
_enlistment = enlistment;
_transaction = transaction;
_twoPhaseNotifications = twoPhaseNotifications;
_singlePhaseNotifications = singlePhaseNotifications;
_atomicTransaction = atomicTransaction;
_enlistmentId = transaction._enlistmentCount++;
_traceIdentifier = EnlistmentTraceIdentifier.Empty;
}
// Create a transaction with the given settings
//
internal DependentTransaction(IsolationLevel isoLevel, InternalTransaction internalTransaction, bool blocking) :
base(isoLevel, internalTransaction)
{
_blocking = blocking;
lock (_internalTransaction)
{
if (blocking)
{
_internalTransaction.State.CreateBlockingClone(_internalTransaction);
}
else
{
_internalTransaction.State.CreateAbortingClone(_internalTransaction);
}
}
}
internal Enlistment(
Guid resourceManagerIdentifier,
InternalTransaction transaction,
IEnlistmentNotification twoPhaseNotifications,
ISinglePhaseNotification singlePhaseNotifications,
Transaction atomicTransaction)
{
_internalEnlistment = new DurableInternalEnlistment(
this,
resourceManagerIdentifier,
transaction,
twoPhaseNotifications,
singlePhaseNotifications,
atomicTransaction
);
}
internal CommittableTransaction(IsolationLevel isoLevel, TimeSpan timeout) : base(isoLevel, (InternalTransaction)null)
{
// object to use for synchronization rather than locking on a public object
_internalTransaction = new InternalTransaction(timeout, this)
{
// Because we passed null for the internal transaction to the base class, we need to
// fill in the traceIdentifier field here.
_cloneCount = 1
};
_cloneId = 1;
TransactionsEtwProvider etwLog = TransactionsEtwProvider.Log;
if (etwLog.IsEnabled())
{
etwLog.TransactionCreated(this, "CommittableTransaction");
}
}
internal void TimeoutTransactions()
{
int i;
int transactionCount = _index;
_timedOut = true;
Interlocked.MemoryBarrier();
for (i = 0; i <= transactionCount && i < _size; i++)
{
Debug.Assert(transactionCount == _index, "Index changed timing out transactions");
InternalTransaction tx = _transactions[i];
if (tx != null)
{
lock (tx)
{
tx.State.Timeout(tx);
}
}
}
}
internal Transaction(IsolationLevel isoLevel, ISimpleTransactionSuperior superior)
{
TransactionManager.ValidateIsolationLevel(isoLevel);
if (superior == null)
{
throw new ArgumentNullException(nameof(superior));
}
_isoLevel = isoLevel;
// Never create a transaction with an IsolationLevel of Unspecified.
if (IsolationLevel.Unspecified == _isoLevel)
{
_isoLevel = TransactionManager.DefaultIsolationLevel;
}
_internalTransaction = new InternalTransaction(this, superior);
// ISimpleTransactionSuperior is defined to also promote to MSDTC.
_internalTransaction.SetPromoterTypeToMSDTC();
_cloneId = 1;
}
internal bool Add(InternalTransaction tx)
{
int currentIndex = Interlocked.Increment(ref _index);
if (currentIndex < _size)
{
tx._tableBucket = this;
tx._bucketIndex = currentIndex;
Interlocked.MemoryBarrier(); // This data must be written before the transaction
// could be timed out.
_transactions[currentIndex] = tx;
if (_timedOut)
{
lock (tx)
{
tx.State.Timeout(tx);
}
}
}
else
{
Bucket newBucket = new Bucket(_owningSet)
{
nextBucketWeak = new WeakReference(this)
};
Bucket oldBucket = Interlocked.CompareExchange(ref _owningSet.headBucket, newBucket, this);
if (oldBucket == this)
{
// ladies and gentlemen we have a winner.
_previous = newBucket;
}
return(false);
}
return(true);
}
// Add a transaction to the table. Transactions are added to the end of the list in sorted order based on their
// absolute timeout.
internal int Add(InternalTransaction txNew)
{
// Tell the runtime that we are modifying global state.
int readerIndex = 0;
readerIndex = _rwLock.EnterReadLock();
try
{
// Start the timer if needed before checking the current time since the current
// time can be more efficient with a running timer.
if (txNew.AbsoluteTimeout != long.MaxValue)
{
if (!_timerEnabled)
{
if (!_timer.Change(_timerInterval, _timerInterval))
{
throw TransactionException.CreateInvalidOperationException(
TraceSourceType.TraceSourceLtm,
SR.UnexpectedTimerFailure,
null
);
}
_lastTimerTime = DateTime.UtcNow.Ticks;
_timerEnabled = true;
}
}
txNew.CreationTime = CurrentTime;
AddIter(txNew);
}
finally
{
_rwLock.ExitReadLock();
}
return(readerIndex);
}
// Create a transaction with the given settings
//
internal Transaction(IsolationLevel isoLevel, InternalTransaction internalTransaction)
{
TransactionManager.ValidateIsolationLevel(isoLevel);
_isoLevel = isoLevel;
// Never create a transaction with an IsolationLevel of Unspecified.
if (IsolationLevel.Unspecified == _isoLevel)
{
_isoLevel = TransactionManager.DefaultIsolationLevel;
}
if (internalTransaction != null)
{
_internalTransaction = internalTransaction;
_cloneId = Interlocked.Increment(ref _internalTransaction._cloneCount);
}
else
{
// Null is passed from the constructor of a CommittableTransaction. That
// constructor will fill in the traceIdentifier because it has allocated the
// internal transaction.
}
}
// Absolute timeout
internal TimeSpan RecalcTimeout(InternalTransaction tx)
{
return(TimeSpan.FromMilliseconds((tx.AbsoluteTimeout - _ticks) * _timerInterval));
}
internal FinalizedObject(InternalTransaction internalTransaction, Guid identifier)
{
_internalTransaction = internalTransaction;
_identifier = identifier;
}
internal TransactionInformation(InternalTransaction internalTransaction)
{
_internalTransaction = internalTransaction;
}
public Phase1VolatileDemultiplexer(InternalTransaction transaction) : base(transaction)
{
}
public VolatileDemultiplexer(InternalTransaction transaction)
{
_transaction = transaction;
}
internal void Remove(InternalTransaction tx)
{
_transactions[tx._bucketIndex] = null;
}
// Remove a transaction from the table.
internal void Remove(InternalTransaction tx)
{
tx._tableBucket.Remove(tx);
tx._tableBucket = null;
}
private void AddIter(InternalTransaction txNew)
{
//
// Theory of operation.
//
// Note that the head bucket contains any transaction with essentially infinite
// timeout (long.MaxValue). The list is sorted in decending order. To add
// a node the code must walk down the list looking for a set of bucket that matches
// the absolute timeout value for the transaction. When it is found it passes
// the insert down to that set.
//
// An importent thing to note about the list is that forward links are all weak
// references and reverse links are all strong references. This allows the GC
// to clean up old links in the list so that they don't need to be removed manually.
// However if there is still a rooted strong reference to an old link in the
// chain that link won't fall off the list because there is a strong reference held
// forward.
//
BucketSet currentBucketSet = _headBucketSet;
while (currentBucketSet.AbsoluteTimeout != txNew.AbsoluteTimeout)
{
BucketSet lastBucketSet = null;
do
{
WeakReference nextSetWeak = (WeakReference)currentBucketSet.nextSetWeak;
BucketSet nextBucketSet = null;
if (nextSetWeak != null)
{
nextBucketSet = (BucketSet)nextSetWeak.Target;
}
if (nextBucketSet == null)
{
//
// We've reached the end of the list either because nextSetWeak was null or
// because its reference was collected. This code doesn't care. Make a new
// set, attempt to attach it and move on.
//
BucketSet newBucketSet = new BucketSet(this, txNew.AbsoluteTimeout);
WeakReference newSetWeak = new WeakReference(newBucketSet);
WeakReference oldNextSetWeak = (WeakReference)Interlocked.CompareExchange(
ref currentBucketSet.nextSetWeak, newSetWeak, nextSetWeak);
if (oldNextSetWeak == nextSetWeak)
{
// Ladies and Gentlemen we have a winner.
newBucketSet.prevSet = currentBucketSet;
}
// Note that at this point we don't update currentBucketSet. On the next loop
// iteration we should be able to pick up where we left off.
}
else
{
lastBucketSet = currentBucketSet;
currentBucketSet = nextBucketSet;
}
}while (currentBucketSet.AbsoluteTimeout > txNew.AbsoluteTimeout);
if (currentBucketSet.AbsoluteTimeout != txNew.AbsoluteTimeout)
{
//
// Getting to here means that we've found a slot in the list where this bucket set should go.
//
BucketSet newBucketSet = new BucketSet(this, txNew.AbsoluteTimeout);
WeakReference newSetWeak = new WeakReference(newBucketSet);
newBucketSet.nextSetWeak = lastBucketSet.nextSetWeak;
WeakReference oldNextSetWeak = (WeakReference)Interlocked.CompareExchange(
ref lastBucketSet.nextSetWeak, newSetWeak, newBucketSet.nextSetWeak);
if (oldNextSetWeak == newBucketSet.nextSetWeak)
{
// Ladies and Gentlemen we have a winner.
if (oldNextSetWeak != null)
{
BucketSet oldSet = (BucketSet)oldNextSetWeak.Target;
if (oldSet != null)
{
// prev references are just there to root things for the GC. If this object is
// gone we don't really care.
oldSet.prevSet = newBucketSet;
}
}
newBucketSet.prevSet = lastBucketSet;
}
// Special note - We are going to loop back to the BucketSet that preceeds the one we just tried
// to insert because we may have lost the race to insert our new BucketSet into the list to another
// "Add" thread. By looping back, we check again to see if the BucketSet we just created actually
// got added. If it did, we will exit out of the outer loop and add the transaction. But if we
// lost the race, we will again try to add a new BucketSet. In the latter case, the BucketSet
// we created during the first iteration will simply be Garbage Collected because there are no
// strong references to it since we never added the transaction to a bucket and the act of
// creating the second BucketSet with remove the backward reference that was created in the
// first trip thru the loop.
currentBucketSet = lastBucketSet;
lastBucketSet = null;
// The outer loop will iterate and pick up where we left off.
}
}
//
// Great we found a spot.
//
currentBucketSet.Add(txNew);
}
internal Transaction(DistributedTransaction distributedTransaction)
{
_isoLevel = distributedTransaction.IsolationLevel;
_internalTransaction = new InternalTransaction(this, distributedTransaction);
_cloneId = Interlocked.Increment(ref _internalTransaction._cloneCount);
}
