public void PersistSagasWith(ISagaPersistence sagaPersistence)
{
_graph.SagaPersistence = sagaPersistence;
}
public void Apply(HandlerChain chain, ISagaPersistence persistence)
{
if (persistence == null)
{
throw new InvalidOperationException("No saga persistence strategy is registered.");
}
var sagaStateType = DetermineSagaStateType(chain);
var sagaIdType = persistence.DetermineSagaIdType(sagaStateType);
var sagaHandler = chain.Handlers.FirstOrDefault(x => x.HandlerType.Closes(typeof(StatefulSagaOf <>)));
var existence = DetermineExistence(sagaHandler.As <HandlerCall>());
Variable sagaIdVariable = null;
if (existence == SagaStateExistence.Existing)
{
var identityMethod = sagaHandler
.HandlerType
.GetMethods(BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static)
.Where(x => x.Name == IdentityMethodName && x.ReturnType == sagaIdType)
.FirstOrDefault(x => x.GetParameters().Any(p => p.ParameterType == chain.MessageType));
var sagaId = ChooseSagaIdProperty(chain.MessageType);
sagaIdVariable = createSagaIdVariable(sagaHandler.HandlerType, chain.MessageType, sagaId, identityMethod, sagaIdType);
chain.Middleware.Add(sagaIdVariable.Creator);
}
var existingState = sagaHandler.Creates.FirstOrDefault(x => x.VariableType == sagaStateType);
// Tells the handler chain codegen to not use this as a cascading message
existingState?.Properties.Add(HandlerChain.NotCascading, true);
var persistenceFrame = persistence.DeterminePersistenceFrame(existence, ref sagaIdVariable, sagaStateType, existingState, out existingState);
if (persistenceFrame != null)
{
chain.Middleware.Add(persistenceFrame);
}
if (existence == SagaStateExistence.Existing)
{
chain.Middleware.Add(new AssertSagaStateExistsFrame(existingState, sagaIdVariable));
}
var enlistInSagaId = MethodCall.For <IMessageContext>(x => x.EnlistInSaga(null));
enlistInSagaId.Arguments[0] = sagaIdVariable;
chain.Postprocessors.Add(enlistInSagaId);
var storeOrDeleteFrame = persistence.DetermineStoreOrDeleteFrame(existingState, sagaHandler.HandlerType);
chain.Postprocessors.Add(storeOrDeleteFrame);
}
public SagaManager(ISagaPersistence sagaPersistence, ISagaPublisher sagaPublisher)
{
_sagaPersistence = sagaPersistence;
_sagaPublisher = sagaPublisher;
}
