public async Task Handle(ICorrelationEvent evt)
{
if (!evt.CorrelationId.HasValue)
{
return;
}
var sagaState = await _sagaStateRepository.Read(evt.CorrelationId.Value).ConfigureAwait(false);
if (sagaState == null)
{
return;
}
var result = await _eventDispatcher.OnEventAsync(sagaState.StateType, sagaState.State, evt).ConfigureAwait(false);
if (result == null)
{
return;
}
if (!result.IsEventHandled)
{
return;
}
if (result.IsSagaComplete)
{
await _sagaStateRepository.Delete(evt.CorrelationId.Value).ConfigureAwait(false);
}
else
{
await _sagaStateRepository.Update(evt.CorrelationId.Value, sagaState.State).ConfigureAwait(false);
}
}
public async Task <StateMachineProcessingResults> OnEventAsync(Type stateType, object state, ICorrelationEvent evt)
{
if (_stateMachineTypes == null)
{
throw new Exception("Saga configuration error. You need to configure the SagaStateMachineFactoryBuilder.");
}
var stateMachineType = _stateMachineTypes[stateType];
if (stateMachineType == null)
{
if (_stateMachineTypes.Values.Count == 0)
{
throw new Exception($"State machine type {stateType} not found. No state machines have been scanned. Did you add the assembly via SagaStateMachineFactoryBuilder.WithStateMachinesInAssembiles?");
}
throw new Exception($"State machine type {stateType} not found out of {_stateMachineTypes.Values.Count} state machines.");
}
if (_container == null)
{
throw new Exception("IContainer supplied to SagaStateMachineFactoryBuilder is null.");
}
var stateMachine = _container.GetInstance(stateMachineType);
var methodInfo = stateMachineType.GetMethod("ProcessNextStep", new[] { typeof(Guid), typeof(ICorrelationEvent), stateType, typeof(StateMachineProcessingResults) });
if (methodInfo == null || stateMachine == null)
{
throw new Exception($"No valid state machine {stateMachineType.Name} for state {stateType.Name}.");
}
{
var result = new StateMachineProcessingResults();
await((Task)methodInfo?.Invoke(stateMachine, new[] { evt.CorrelationId, evt, state, result })).ConfigureAwait(false);
return(result);
}
}
public abstract Task ProcessNextStep(Guid correlationId, ICorrelationEvent evt, T state, StateMachineProcessingResults results);
