/// <summary>
/// Returns a valid opened and connected IStatelessSession instance
/// for the given connection alias.
/// </summary>
/// <param name="alias"></param>
/// <returns></returns>
public IStatelessSession OpenStatelessSession(String alias)
{
if (alias == null)
{
throw new ArgumentNullException("alias");
}
ITransaction transaction = ObtainCurrentTransaction();
StatelessSessionDelegate wrapped = sessionStore.FindCompatibleStatelessSession(alias);
if (wrapped == null || (transaction != null && !wrapped.Transaction.IsActive))
{
IStatelessSession session = CreateStatelessSession(alias);
wrapped = WrapSession(transaction == null, session);
EnlistIfNecessary(true, transaction, wrapped);
sessionStore.Store(alias, wrapped);
}
else
{
EnlistIfNecessary(false, transaction, wrapped);
wrapped = WrapSession(false, wrapped.InnerSession);
}
return(wrapped);
}
/// <summary>
/// Enlists if necessary.
/// </summary>
/// <param name="weAreSessionOwner">if set to <c>true</c> [we are session owner].</param>
/// <param name="transaction">The transaction.</param>
/// <param name="session">The session.</param>
/// <returns></returns>
protected bool EnlistIfNecessary(bool weAreSessionOwner,
ITransaction transaction,
StatelessSessionDelegate session)
{
if (transaction == null)
{
return(false);
}
var list = (IList <IStatelessSession>)transaction.Context["nh.statelessSession.enlisted"];
bool shouldEnlist;
if (list == null)
{
list = new List <IStatelessSession>();
shouldEnlist = true;
}
else
{
shouldEnlist = true;
foreach (IStatelessSession sess in list)
{
if (StatelessSessionDelegate.AreEqual(session, sess))
{
shouldEnlist = false;
break;
}
}
}
if (shouldEnlist)
{
if (session.Transaction == null || !session.Transaction.IsActive)
{
transaction.Context["nh.statelessSession.enlisted"] = list;
IsolationLevel level = TranslateIsolationLevel(transaction.IsolationMode);
transaction.Enlist(new ResourceAdapter(session.BeginTransaction(level), transaction.IsAmbient));
list.Add(session);
}
if (weAreSessionOwner)
{
transaction.RegisterSynchronization(new StatelessSessionDisposeSynchronization(session));
}
}
return(true);
}
/// <summary>
/// Returns <see langword="true"/> if the supplied stateless sessions are equal, <see langword="false"/> otherwise.
/// </summary>
/// <param name="left">The left.</param>
/// <param name="right">The right.</param>
/// <returns></returns>
public static bool AreEqual(IStatelessSession left, IStatelessSession right)
{
StatelessSessionDelegate ssdLeft = left as StatelessSessionDelegate;
StatelessSessionDelegate ssdRight = right as StatelessSessionDelegate;
if (ssdLeft != null && ssdRight != null)
{
return(Object.ReferenceEquals(ssdLeft._innerSession, ssdRight._innerSession));
}
else
{
throw new NotSupportedException("AreEqual: left is " +
left.GetType().Name + " and right is " + right.GetType().Name);
}
}
/// <summary>
/// Enlists if necessary.
/// </summary>
/// <param name="weAreSessionOwner">if set to <c>true</c> [we are session owner].</param>
/// <param name="transaction">The transaction.</param>
/// <param name="session">The session.</param>
/// <returns></returns>
protected bool EnlistIfNecessary(bool weAreSessionOwner,
ITransaction transaction,
StatelessSessionDelegate session)
{
if (transaction == null)
{
return(false);
}
if (weAreSessionOwner && session.Transaction.IsActive)
{
var ue = new UnregisterEnlistment(Logger, session.UnregisterFromStore, transaction);
transaction.Inner.EnlistVolatile(ue, EnlistmentOptions.EnlistDuringPrepareRequired);
}
return(true);
}
