public SagaDispatchResult DispatchToSaga(string correlationId, object message, bool createNew, bool wait, SagaBase sagaHandler, Action<SagaBase> callback)
{
string sagaId = null;
if (!sagaHandler.TryGetSagaIdFromMessage(message, out sagaId))
{
sagaId = correlationId;
}
else
{
if (SagaBase.IGNORE_MESSAGE == sagaId)
{
return SagaDispatchResult.MessageHandled;
}
}
if (!createNew && string.IsNullOrEmpty(sagaId))
{
if (IgnoreMessagesWithoutSagaId)
{
return SagaDispatchResult.MessageHandled;
}
else throw new Exception("Saga Id could not be determined");
}
bool b = ExclusiveLock(sagaId, wait, delegate()
{
DispatchToSagaInternal(sagaId, createNew, sagaHandler, callback);
});
if (!b)
{
log.Info("Concurrent update of saga {0}, will process the message later", sagaId);
}
return b ? SagaDispatchResult.MessageHandled : SagaDispatchResult.ConcurrentUpdateHandleLater;
}
protected void DispatchToSagaInternal(string sagaId, bool createNew, SagaBase sagaHandler, Action <SagaBase> callback)
{
string version = null;
bool found = false;
object sagaState = null;
var st = Stopwatch.StartNew();
var sagaStateType = sagaHandler.GetType().BaseType.GetGenericArguments()[0]; //todo: what if inheritance is deeper???
if (!string.IsNullOrEmpty(sagaId))
{
found = SagaStateRepo.Get(sagaId, sagaStateType, true, out sagaState, out version);
}
else //create new id
{
sagaId = Guid.NewGuid().ToString("N");
}
if (!found)
{
if (!createNew)
{
throw new Exception("Saga instance not found: " + sagaId);
}
sagaState = Activator.CreateInstance(sagaStateType);
version = "1";
}
sagaHandler.IsNew = !found;
sagaHandler.InitializeSagaState(sagaId, version, sagaState);
callback(sagaHandler);
if (sagaHandler.Completed)
{
if (!createNew)
{
SagaStateRepo.Delete(sagaId);
log.Info("Deleted saga {0}/{1}", sagaHandler.GetType().Name, sagaId);
}
}
else
{
sagaHandler.BeforeSave();
if (!found)
{
SagaStateRepo.InsertNew(sagaHandler.Id, sagaState);
log.Info("Saved new saga {0}/{1}", sagaHandler.GetType().Name, sagaId);
}
else
{
SagaStateRepo.Update(sagaHandler.Id, sagaState, version);
log.Debug("Updated saga {0}/{1}", sagaHandler.GetType().Name, sagaId);
}
}
st.Stop();
statLog.Info("Dispatch:{0}", st.ElapsedMilliseconds);
}
public EfSagaRecord(SagaBase saga, List<SagaCorrelationProperty> sagaCorrelationIds) : base(saga.SagaId)
{
Guard.ArgumentNotNull(saga, nameof(saga));
Guard.ArgumentNotNull(sagaCorrelationIds, nameof(sagaCorrelationIds));
var sagaState = saga.SagaState;
var sagaStateType = sagaState.State.GetType();
StateType = sagaStateType.AssemblyQualifiedName;
SagaState = ContractlessMessagePackSerializer.Instance.BinarySerialize(sagaState.State, sagaStateType);
SagaVersion = sagaState.SagaVersion;
foreach (var message in sagaState.Messages)
{
this.RaiseEvent(message);
}
sagaState.Messages.Clear();
CorrelationIds = sagaCorrelationIds.Select(id => new EfSagaCorrelationId(Id, saga.GetType().Name, id.PropertyName, id.PropertyValue)).ToList();
}
// here we need to attach Saga
public void SaveSaga(SagaBase saga, List <SagaCorrelationProperty> correlationIds)
{
using (var db = _contextFactory())
{
var record = new EfSagaRecord(saga, correlationIds);
if (record.SagaVersion == 1)
{
db.Sagas.Add(record);
}
else
{
db.Sagas.Update(record);
db.Entry(record).Property("SagaVersion").OriginalValue = (saga.SagaState.SagaVersion - 1);
}
db.SaveChanges();
}
}
public List <SagaCorrelationProperty> GetCorrelationIdsFromSaga(SagaBase saga)
{
if (saga.GetType() != SagaType)
{
throw new InvalidOperationException("Wrong Saga Type");
}
List <SagaCorrelationProperty> result = new List <SagaCorrelationProperty>();
foreach (var config in EventMappings.Values.DistinctBy(v => v.SagaPropertyName))
{
var value = config.SagaPropertyFunc(saga.SagaState.State);
if (value == null || object.Equals(GetDefault(value.GetType()), value))
{
continue;
}
result.Add(new SagaCorrelationProperty(config.SagaPropertyName, value.ToString()));
}
return(result);
}
public SagaDispatchResult DispatchToSaga(string correlationId, object message, bool createNew, bool wait, SagaBase sagaHandler, Action <SagaBase> callback)
{
string sagaId = null;
if (!sagaHandler.TryGetSagaIdFromMessage(message, out sagaId))
{
sagaId = correlationId;
}
else
{
if (SagaBase.IGNORE_MESSAGE == sagaId)
{
return(SagaDispatchResult.MessageHandled);
}
}
if (!createNew && string.IsNullOrEmpty(sagaId))
{
if (IgnoreMessagesWithoutSagaId)
{
return(SagaDispatchResult.MessageHandled);
}
else
{
throw new Exception("Saga Id could not be determined");
}
}
bool b = ExclusiveLock(sagaId, wait, delegate()
{
DispatchToSagaInternal(sagaId, createNew, sagaHandler, callback);
});
if (!b)
{
log.Info("Concurrent update of saga {0}, will process the message later", sagaId);
}
return(b ? SagaDispatchResult.MessageHandled : SagaDispatchResult.ConcurrentUpdateHandleLater);
}
public SendNotificationToAdministrator(SagaBase saga) : base(saga)
{
}
public SendGreetingEmail(SagaBase saga) : base(saga)
{
}
protected void DispatchToSagaInternal(string sagaId, bool createNew, SagaBase sagaHandler, Action<SagaBase> callback)
{
string version = null;
bool found = false;
object sagaState = null;
var st = Stopwatch.StartNew();
var sagaStateType = sagaHandler.GetType().BaseType.GetGenericArguments()[0]; //todo: what if inheritance is deeper???
if (!string.IsNullOrEmpty(sagaId))
{
found = SagaStateRepo.Get(sagaId, sagaStateType, true, out sagaState, out version);
}
else //create new id
{
sagaId = Guid.NewGuid().ToString("N");
}
if (!found)
{
if (!createNew) throw new Exception("Saga instance not found: " + sagaId);
sagaState = Activator.CreateInstance(sagaStateType);
version = "1";
}
sagaHandler.IsNew = !found;
sagaHandler.InitializeSagaState(sagaId, version, sagaState);
callback(sagaHandler);
if (sagaHandler.Completed)
{
if (!createNew)
{
SagaStateRepo.Delete(sagaId);
log.Info("Deleted saga {0}/{1}", sagaHandler.GetType().Name, sagaId);
}
}
else
{
sagaHandler.BeforeSave();
if (!found)
{
SagaStateRepo.InsertNew(sagaHandler.Id, sagaState);
log.Info("Saved new saga {0}/{1}", sagaHandler.GetType().Name, sagaId);
}
else
{
SagaStateRepo.Update(sagaHandler.Id, sagaState, version);
log.Debug("Updated saga {0}/{1}", sagaHandler.GetType().Name, sagaId);
}
}
st.Stop();
statLog.Info("Dispatch:{0}", st.ElapsedMilliseconds);
}
