/// <summary>
/// Create a transaction
/// </summary>
/// <param name="transactionsList">The optional transactions to see this transaction with.</param>
/// <param name="isolated">Whether this is an isolated transaction.</param>
/// <param name="callerMemberName"></param>
/// <param name="callerLineNumber"></param>
/// <returns></returns>
/// <remarks>
/// An isolated transaction is one which sits away from any other current transactions. One could say have a transaction
/// being currently active but the code needs to create a transaction for which every transaction is committed by the time the commit has been executed.
/// This wouldn't happen unless it were an isolated transaction.
/// Whenever a transaction is created, the transaction depth is incremented. For non isolated transactions if there is already a transaction in play then any new transactions are appended to it.
/// </remarks>
public static Transaction Create(TransactionsList transactionsList = default, bool isolated = false, [CallerMemberName] string callerMemberName = default, [CallerLineNumber] int callerLineNumber = default)
{
var id = Interlocked.Increment(ref _idSeed);
if (IsLoggingEnabled.Value)
{
Logging.Instance.LogInformation(
"Transaction {id} Created, isolated:{isolated},thread:{threadId},with transactions:{withTransactions},transaction depth:{transactionDepth}",
id, isolated, Thread.CurrentThread.ManagedThreadId, (transactionsList != default),
Model.TransactionDepth);
}
Model.Lock.EnterWriteLock();
try
{
++Model.TransactionDepth;
// let us check that if the current instance is isolated then any requests whilst active should be isolated as well
if (!isolated && Model.TransactionDepth > 1 && Model.Instance.Isolated)
{
isolated = true;
Logging.Instance.LogWarning("Transaction {id} created inside an existing isolated transaction.Promoting to isolated as well. Called by {calledMember}, {calledLineNumber}", id, callerMemberName, callerLineNumber);
}
var transaction = new Transaction(id, transactionsList, isolated);
Model.SaveInstance();
Model.Instance = transaction;
return(transaction);
}
finally
{
Model.Lock.ExitWriteLock();
}
}
private Transaction(int id, TransactionsList transactionsList, bool isolated = false)
{
_id = id;
Isolated = isolated;
TransactionsList = transactionsList ?? new TransactionsList();
}
private Transaction(int id)
{
_id = id;
TransactionsList = new TransactionsList();
}
/// <summary>
/// Add a transaction.
/// </summary>
/// <param name="action"></param>
public void Add(Action action)
{
VerifyTransaction();
TransactionsList.Add(action);
}
/// <summary>
/// Commit any transactions.
/// </summary>
/// <remarks>
/// If this is an isolated transaction the transactions are immediately committed.
/// If not isolated then if the transaction depth is "1" then the transactions are added to a commit queue. If the commit queue isn't currently being processed then
/// this transactions are then committed. If the commit queue is active then a prior commit call will result in the transactions ultimately being 'committed'.
/// </remarks>
public void Commit()
{
if (IsLoggingEnabled.Value)
{
Logging.Instance.LogInformation(
"Transaction {id} Commit starting,thread:{threadId},no transactions:{noTransactions},transaction depth:{transactionDepth}", _id,
Thread.CurrentThread.ManagedThreadId, TransactionsList.Count, Model.TransactionDepth);
}
var commit = false;
Model.Lock.EnterWriteLock();
try
{
--Model.TransactionDepth;
// if not isolated and there are some transactions then add them to the commit queue
if (!Isolated && TransactionsList.Count > 0)
{
Model.CommitQueue.Add(TransactionsList);
}
// if isolated or depth of transactions is back at ground zero then we need to commit
if (Isolated || Model.TransactionDepth == 0)
{
commit = true;
}
Model.RestoreInstance();
}
finally
{
Model.Lock.ExitWriteLock();
}
// should we commit transactions?
if (commit)
{
try
{
// If this is an isolated transaction, then we apply immediately
if (Isolated)
{
TransactionsList.Apply();
}
else
{
// This will return immediately if higher level commit currently in play
Model.CommitQueue.Commit();
}
}
catch (Exception exception)
{
Logging.Instance.LogError(exception, "Transaction {id} Commit failure", _id);
// mark as complete, so as to not generate a duff error
_completed = true;
throw;
}
}
// indicate we are done
_completed = true;
if (IsLoggingEnabled.Value)
{
Logging.Instance.LogInformation(
"Transaction {id} Commit complete,thread:{threadId},transaction depth:{transactionDepth}", _id,
Thread.CurrentThread.ManagedThreadId, Model.TransactionDepth);
}
}
/// <summary>
/// Create a new transactions list from a provided <see cref="TransactionsList"/>
/// </summary>
/// <param name="transactionsList"></param>
public TransactionsList(TransactionsList transactionsList)
{
_transactions = transactionsList != null ? new List <Action>(transactionsList._transactions) : new List <Action>();
}
