static Func <TMessage, Guid> GetCorrelationIdSelector(EventBinder <TSaga> binder)
{
Func <TMessage, Guid> correlationIdSelector = binder.GetCorrelationIdSelector <TMessage>();
if (correlationIdSelector != null)
{
return(correlationIdSelector);
}
var visitor = new CorrelationExpressionToSagaIdVisitor <TSaga, TMessage>();
Expression <Func <TMessage, Guid> > exp = visitor.Build(binder.GetBindExpression <TMessage>());
if (exp != null)
{
return(exp.Compile());
}
if (typeof(TMessage).Implements <CorrelatedBy <Guid> >())
{
Type genericType = typeof(Correlated <>).MakeGenericType(typeof(TSaga), typeof(TMessage), typeof(TMessage));
var correlated = (ICorrelated <TMessage>)Activator.CreateInstance(genericType);
return(correlated.CorrelationIdSelector);
}
return(x => NewId.NextGuid());
}
public PropertySagaSubscriptionConnector(ISagaRepository <TSaga> sagaRepository,
DataEvent <TSaga, TMessage> dataEvent,
IEnumerable <State> states,
ISagaPolicyFactory policyFactory,
Expression <Func <TSaga, bool> > removeExpression,
EventBinder <TSaga> eventBinder)
{
_sagaRepository = sagaRepository;
_dataEvent = dataEvent;
_bindExpression = eventBinder.GetBindExpression <TMessage>();
Func <TMessage, Guid> correlationIdSelector = GetCorrelationIdSelector(eventBinder);
_policy = policyFactory.GetPolicy(states, correlationIdSelector, removeExpression);
}
public PropertyEventSagaWorkerConnector(ISagaRepository <TSaga> sagaRepository,
DataEvent <TSaga, TMessage> dataEvent,
IEnumerable <State> states,
ISagaPolicyFactory policyFactory,
Expression <Func <TSaga, bool> > removeExpression,
EventBinder <TSaga> eventBinder)
: base(sagaRepository)
{
_dataEvent = dataEvent;
_states = states;
_policyFactory = policyFactory;
_removeExpression = removeExpression;
_bindExpression = eventBinder.GetBindExpression <TMessage>();
_correlationIdSelector = GetCorrelationIdSelector(eventBinder);
}
