public async Task <ISaga> Publish(ISagaEvent @event, IDictionary <string, object> executionValues)
{
Type eventType = @event.GetType();
SagaID sagaId = SagaID.From(@event.ID);
ISagaModel model = sagaRegistrator.
FindModelForEventType(eventType);
if (model == null)
{
throw new SagaEventNotRegisteredException(eventType);
}
ISaga newSaga = await CreateNewSagaIfRequired(model, sagaId, eventType);
try
{
return(await ExecuteSaga(
@event,
model,
newSaga,
SagaID.From(newSaga?.Data?.ID ?? sagaId.Value),
executionValues,
false));
}
catch
{
//if (newSaga != null)
// await sagaPersistance.Remove(newSaga.Data.ID);
throw;
}
}
private async Task <ISaga> CreateNewSaga(ISagaModel model, SagaID id)
{
if (id == SagaID.Empty())
{
id = SagaID.New();
}
ISagaData data = (ISagaData)Activator.CreateInstance(model.SagaStateType);
data.ID = id;
ISaga saga = new Saga
{
Data = data,
ExecutionInfo = new SagaExecutionInfo
{
ModelName = model.Name,
Created = dateTimeProvider.Now,
Modified = dateTimeProvider.Now
},
ExecutionState = new SagaExecutionState
{
CurrentState = new SagaStartState().GetStateName(),
CurrentStep = null
}
};
return(saga);
}
public AsyncStepCompletedMessage(SagaID sagaID, string currentState,
string currentStep, bool isCompensating, ISagaModel model)
{
SagaID = sagaID;
CurrentState = currentState;
CurrentStep = currentStep;
IsCompensating = isCompensating;
Model = model;
}
private async Task <ISaga> CreateNewSagaIfRequired(ISagaModel model, SagaID id, Type eventType)
{
ISaga saga = null;
if (eventType != null)
{
bool isStartEvent = model.Actions.IsStartEvent(eventType);
if (isStartEvent)
{
saga = await CreateNewSaga(model, id);
}
}
return(saga);
}
public async Task <ISaga> Publish(ISagaEvent @event, IDictionary <string, object> executionValues, Guid?parentId, SagaRunOptions runOptions)
{
runOptions = runOptions ?? new SagaRunOptions();
Type eventType = @event.GetType();
SagaID sagaId = SagaID.From(@event.ID);
ISagaModel model = sagaRegistrator.
FindModelForEventType(eventType);
if (model == null)
{
throw new SagaEventNotRegisteredException(eventType);
}
SagaID?parentSagaId = parentId == null ? (SagaID?)null : SagaID.From(parentId.Value);
ISaga newSaga = await CreateNewSagaIfRequired(model, sagaId, parentSagaId, eventType);
var id = SagaID.From(newSaga?.Data?.ID ?? sagaId.Value);
try
{
var createdSaga = await ExecuteSaga(
@event,
model,
newSaga,
id,
executionValues,
false,
runOptions);
return(createdSaga);
}
/*catch (SagaStopException ex)
* {
* return await sagaPersistance.Get(id.Value);
* }*/
catch
{
//if (newSaga != null)
// await sagaPersistance.Remove(newSaga.Data.ID);
throw;
}
}
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;
}
}
public ExecutionEndMessage(SagaID sagaId)
{
SagaId = sagaId;
}
public ExecutionStartMessage(SagaID saga, ISagaModel model)
{
SagaID = saga;
this.Model = model;
}