public FactID InsertFact(FactMemento fact, int typeId)
{
_session.Command.CommandText = "INSERT Fact (FKTypeID, Data, Hashcode) VALUES (@TypeID, @Data, @Hashcode)";
AddParameter("@TypeID", typeId);
AddParameter("@Data", fact.Data);
AddParameter("@Hashcode", fact.GetHashCode());
_session.Command.ExecuteNonQuery();
_session.Command.Parameters.Clear();
_session.Command.CommandText = "SELECT @@IDENTITY";
decimal result = (decimal)_session.Command.ExecuteScalar();
_session.Command.Parameters.Clear();
return(new FactID {
key = (Int64)result
});
}
public List <IdentifiedFactMemento> GetEqualFactsByHashCode(FactMemento memento, bool readCommitted, int typeId)
{
_session.Command.CommandText = HEAD_SELECT +
(readCommitted ? "" : "WITH (NOLOCK) ") +
"WHERE f.FKTypeID = @TypeID AND f.Hashcode = @Hashcode " +
TAIL_JOIN +
"ORDER BY ff.FactID, p.PredecessorID";
AddParameter("@TypeID", typeId);
AddParameter("@Hashcode", memento.GetHashCode());
using (var loader = new Loader(_session.Command.ExecuteReader()))
{
_session.Command.Parameters.Clear();
return(loader.LoadMementos()
.Where(im => im.Memento.Equals(memento))
.ToList());
}
}
private List <IdentifiedFactMemento> FindExistingFacts(FactMemento memento, Session session, bool readCommitted)
{
int typeId = SaveType(session, memento.FactType);
// Load all candidates that have the same hash code.
session.Command.CommandText = HEAD_SELECT +
(readCommitted ? "" : "WITH (NOLOCK) ") +
"WHERE f.FKTypeID = @TypeID AND f.Hashcode = @Hashcode " +
TAIL_JOIN +
"ORDER BY ff.FactID, p.PredecessorID";
AddParameter(session.Command, "@TypeID", typeId);
AddParameter(session.Command, "@Hashcode", memento.GetHashCode());
using (IDataReader factReader = session.Command.ExecuteReader())
{
session.Command.Parameters.Clear();
return(LoadMementosFromReader(factReader).Where(im => im.Memento.Equals(memento)).ToList());
}
}
public FactID Save(string domain, FactMemento fact, Guid clientGuid)
{
// Retry on concurrency failure.
while (true)
{
using (var session = new Session(_connectionString))
{
session.BeginTransaction();
// First see if the fact is already in storage.
FactID id;
if (FindExistingFact(fact, out id, session, readCommitted: true))
{
return(id);
}
// It isn't there, so store it.
int typeId = SaveType(session, fact.FactType);
session.Command.CommandText = "INSERT Fact (FKTypeID, Data, Hashcode) VALUES (@TypeID, @Data, @Hashcode)";
AddParameter(session.Command, "@TypeID", typeId);
AddParameter(session.Command, "@Data", fact.Data);
AddParameter(session.Command, "@Hashcode", fact.GetHashCode());
session.Command.ExecuteNonQuery();
session.Command.Parameters.Clear();
session.Command.CommandText = "SELECT @@IDENTITY";
decimal result = (decimal)session.Command.ExecuteScalar();
session.Command.Parameters.Clear();
id.key = (Int64)result;
// Store the predecessors.
foreach (PredecessorMemento predecessor in fact.Predecessors)
{
int roleId = SaveRole(session, predecessor.Role);
session.Command.CommandText = "INSERT Predecessor (FKFactID, FKRoleID, FKPredecessorFactID, IsPivot) VALUES (@FactID, @RoleID, @PredecessorFactID, @IsPivot)";
AddParameter(session.Command, "@FactID", id.key);
AddParameter(session.Command, "@RoleID", roleId);
AddParameter(session.Command, "@PredecessorFactID", predecessor.ID.key);
AddParameter(session.Command, "@IsPivot", predecessor.IsPivot);
session.Command.ExecuteNonQuery();
session.Command.Parameters.Clear();
}
// Store a message for each pivot.
FactID newFactId = id;
List <MessageMemento> pivotMessages = fact.Predecessors
.Where(predecessor => predecessor.IsPivot)
.Select(predecessor => new MessageMemento(predecessor.ID, newFactId))
.ToList();
// Store messages for each non-pivot. This fact belongs to all predecessors' pivots.
string[] nonPivots = fact.Predecessors
.Where(predecessor => !predecessor.IsPivot)
.Select(predecessor => predecessor.ID.key.ToString())
.ToArray();
List <MessageMemento> nonPivotMessages;
if (nonPivots.Length > 0)
{
string nonPivotGroup = string.Join(",", nonPivots);
session.Command.CommandText = string.Format(
"SELECT DISTINCT PivotId FROM Message WHERE FactId IN ({0})",
nonPivotGroup);
List <FactID> predecessorsPivots;
using (IDataReader predecessorPivotReader = session.Command.ExecuteReader())
{
session.Command.Parameters.Clear();
predecessorsPivots = LoadIDsFromReader(predecessorPivotReader).ToList();
}
nonPivotMessages = predecessorsPivots
.Select(predecessorPivot => new MessageMemento(predecessorPivot, newFactId))
.ToList();
}
else
{
nonPivotMessages = new List <MessageMemento>();
}
int clientId = SaveClient(session, clientGuid);
var messages = pivotMessages.Union(nonPivotMessages).Distinct().ToList();
SaveMessages(session, messages, clientId);
// Optimistic concurrency check.
// Make sure we don't find more than one.
var existingFacts = FindExistingFacts(fact, session, readCommitted: false);
if (existingFacts.Count == 1)
{
session.Commit();
if (messages.Any() && PivotAffected != null)
{
foreach (var message in messages)
{
PivotAffected(domain, message.PivotId);
}
}
return(id);
}
else
{
_retried = true;
}
}
}
}
public FactID InsertFact(FactMemento fact, int typeId)
{
_session.Command.CommandText = "INSERT Fact (FKTypeID, Data, Hashcode) VALUES (@TypeID, @Data, @Hashcode)";
AddParameter("@TypeID", typeId);
AddParameter("@Data", fact.Data);
AddParameter("@Hashcode", fact.GetHashCode());
_session.Command.ExecuteNonQuery();
_session.Command.Parameters.Clear();
_session.Command.CommandText = "SELECT @@IDENTITY";
decimal result = (decimal)_session.Command.ExecuteScalar();
_session.Command.Parameters.Clear();
return new FactID { key = (Int64)result };
}
public List<IdentifiedFactMemento> GetEqualFactsByHashCode(FactMemento memento, bool readCommitted, int typeId)
{
_session.Command.CommandText = HEAD_SELECT +
(readCommitted ? "" : "WITH (NOLOCK) ") +
"WHERE f.FKTypeID = @TypeID AND f.Hashcode = @Hashcode " +
TAIL_JOIN +
"ORDER BY ff.FactID, p.PredecessorID";
AddParameter("@TypeID", typeId);
AddParameter("@Hashcode", memento.GetHashCode());
using (var loader = new Loader(_session.Command.ExecuteReader()))
{
_session.Command.Parameters.Clear();
return loader.LoadMementos()
.Where(im => im.Memento.Equals(memento))
.ToList();
}
}