private async Task <ISaga> DispatchStepSync(
ExecuteStepCommand command)
{
using (IServiceScope scope = serviceScopeFactory.CreateScope())
{
ExecuteStepCommandHandler stepExecutor = ActivatorUtilities.
CreateInstance <ExecuteStepCommandHandler>(scope.ServiceProvider);
ISaga saga = await stepExecutor.
Handle(command);
if (saga == null)
{
await messageBus.Publish(
new ExecutionEndMessage(SagaID.From(command.Saga.Data.ID)));
return(null);
}
else
{
if (saga.IsIdle())
{
await messageBus.Publish(
new ExecutionEndMessage(SagaID.From(saga.Data.ID)));
if (saga.HasError())
{
throw saga.ExecutionState.CurrentError;
}
return(saga);
}
else
{
return(await Handle(new ExecuteActionCommand()
{
Async = AsyncExecution.False(),
Saga = saga,
Model = command.Model
}));
}
}
}
}
private async Task <ISaga> ExecuteSaga(
ISagaEvent @event, ISagaModel model,
ISaga saga,
Guid sagaID,
IDictionary <string, object> executionValues,
bool resume)
{
bool sagaStarted = false;
try
{
serviceProvider.
GetRequiredService <ObservableRegistrator>().
Initialize();
await messageBus.
Publish(new ExecutionStartMessage(SagaID.From(sagaID), model));
sagaStarted = true;
if (saga == null)
{
saga = await sagaPersistance.Get(sagaID);
}
if (saga == null)
{
throw new SagaInstanceNotFoundException();
}
if (saga.ExecutionState.IsDeleted)
{
throw new CountNotExecuteDeletedSagaException(sagaID);
}
if (!resume)
{
if (saga.IsIdle())
{
saga.ExecutionState.CurrentError = null;
saga.ExecutionState.ExecutionID = ExecutionID.New();
if (model.HistoryPolicy == ESagaHistoryPolicy.StoreOnlyCurrentStep)
{
saga.ExecutionState.History.Clear();
}
saga.ExecutionValues.
Set(executionValues);
saga.ExecutionState.
CurrentEvent = @event ?? new EmptyEvent();
}
else
{
throw new SagaNeedToBeResumedException(saga.Data.ID);
}
logger.
LogInformation($"Executing saga: {saga.Data.ID}");
}
else
{
logger.
LogInformation($"Resuming saga: {saga.Data.ID}");
}
ExecuteActionCommandHandler handler = serviceProvider.
GetRequiredService <ExecuteActionCommandHandler>();
return(await handler.Handle(new ExecuteActionCommand
{
Async = AsyncExecution.False(),
Saga = saga,
Model = model
}));
}
catch (Exception ex)
{
if (sagaStarted)
{
await messageBus.Publish(
new ExecutionEndMessage(SagaID.From(sagaID)));
}
if (ex is SagaStepException sagaStepException && sagaStepException?.OriginalException != null)
{
throw sagaStepException.OriginalException;
}
throw;
}
}