public TransactionService GetTransaction(bool create, bool queryOnly, out bool isNew)
{
var transaction = _slot.Value;
if (create && transaction == null)
{
isNew = true;
bool alreadyLock;
// must lock _transaction before work with _transactions (GetInitialSize use _transactions)
lock (_transactions)
{
if (_transactions.Count >= MAX_OPEN_TRANSACTIONS)
{
throw new LiteException(0, "Maximum number of transactions reached");
}
var initialSize = this.GetInitialSize();
// check if current thread contains any transaction
alreadyLock = _transactions.Values.Any(x => x.ThreadID == Environment.CurrentManagedThreadId);
transaction = new TransactionService(_header, _locker, _disk, _walIndex, initialSize, this, queryOnly);
// add transaction to execution transaction dict
_transactions[transaction.TransactionID] = transaction;
}
// enter in lock transaction after release _transaction lock
if (alreadyLock == false)
{
try
{
_locker.EnterTransaction();
}
catch
{
transaction.Dispose();
lock (_transactions)
{
// return pages
_freePages += transaction.MaxTransactionSize;
_transactions.Remove(transaction.TransactionID);
}
throw;
}
}
// do not store in thread query-only transaction
if (queryOnly == false)
{
_slot.Value = transaction;
}
}
else
{
isNew = false;
}
return(transaction);
}
/// <summary>
/// Check if transaction size reach limit AND check if is possible extend this limit
/// </summary>
public bool CheckSafepoint(TransactionService trans)
{
return
(trans.Pages.TransactionSize >= trans.MaxTransactionSize &&
this.TryExtend(trans) == false);
}
public QueryPipe(TransactionService transaction, IDocumentLookup loader, SortDisk tempDisk, bool utcDate)
: base(transaction, loader, tempDisk, utcDate)
{
}
public GroupByPipe(TransactionService transaction, IDocumentLookup loader, SortDisk tempDisk, EnginePragmas pragmas)
: base(transaction, loader, tempDisk, pragmas)
{
}
public QueryPipe(TransactionService transaction, IDocumentLookup loader, EnginePragmas pragmas)
: base(transaction, loader, pragmas)
{
}
/// <summary>
/// Dispose transaction and remove from global variable
/// </summary>
internal void ClearTransaction()
{
_locker.Release();
_transaction.Dispose();
_transaction = null;
}
