public static ISagaStep GetNextStepToExecute(
this ISagaAction sagaAction,
ISagaStep step,
SagaExecutionState sagaState)
{
NextStepInfo nextStepForWhile = getNextStepForWhile(sagaAction, step, sagaState);
if (nextStepForWhile != null)
{
return(nextStepForWhile.NextStep);
}
NextStepInfo nextStepForIf = getNextStepForIf(sagaAction, step, sagaState);
if (nextStepForIf != null)
{
return(nextStepForIf.NextStep);
}
NextStepInfo nextChildStep = getChildNextStep(step);
if (nextChildStep != null)
{
return(nextChildStep.NextStep);
}
return(getNextStep(sagaAction, step, sagaState));
}
static bool getResultFromPrevIfElse(
SagaSteps childSteps,
ISagaStep step,
SagaExecutionState sagaState)
{
while (true)
{
ISagaStep prevStepIf = GetPrevStepSameLevel(childSteps, step.ParentStep, step);
if (prevStepIf.Is <ISagaStepForIf>())
{
IStepData stepDataIf = sagaState.History.
GetLatestByStepName(prevStepIf.StepName);
if (stepDataIf?.ExecutionData?.ConditionResult == true)
{
return(true);
}
if (!prevStepIf.Is <ISagaStepForElse>())
{
return(false);
}
step = prevStepIf;
}
else
{
return(false);
}
}
}
/// <summary>
/// Инициализирует новый экземпляр класса <see cref="SagaConsumerOf{TS,TM,TK}"/>.
/// </summary>
/// <param name="sagaLifecycle">Управляет жизненным циклом саги.</param>
/// <param name="sagaStep">Обработчик шага саги.</param>
/// <param name="canInitiate">Если <c>true</c> - тогда сага может быть создана обработчиком сообщения.</param>
/// <param name="failedHandler">Обработчик ошибок в саге.</param>
public SagaConsumerOf(ISagaLifecycle <TS, TM, TK> sagaLifecycle, ISagaStep <TS, TM, TK> sagaStep, bool canInitiate, ISagaFailedHandler <TS, TM, TK> failedHandler)
{
this.SagaLifecycle = sagaLifecycle;
this.SagaStep = sagaStep;
this.CanInitiate = canInitiate;
this.SagaFailedHandler = failedHandler;
}
static ISagaStep getNextStepForElse(
ISagaAction sagaAction,
ISagaStep step,
SagaExecutionState sagaState)
{
if (step.Is <ISagaStepForElse>())
{
bool ifElseResult = getResultFromPrevIfElse(
sagaAction.ChildSteps,
step,
sagaState);
// jesli if-else jest spelniony to nie wchodzimy juz do niego
// czyli szukamy kolengo kroku poza if-else
if (ifElseResult)
{
ISagaStep nextStepAfterIfElse = GetNextStepAfterIfElse(
sagaAction.ChildSteps,
step);
if (nextStepAfterIfElse != null)
{
return(nextStepAfterIfElse);
}
}
return(getNextStep(sagaAction, step, sagaState));
}
return(step);
}
public static ISagaAction FindActionForStep(
this ISagaModel model, ISagaStep sagaStep)
{
return(model.Actions.
FindActionByStep(sagaStep?.StepName));
}
public static async Task ExecuteChain(
List <NextMiddleware> middlewaresChain,
ISaga saga,
ISagaStep sagaStep,
StepData stepData)
{
await middlewaresChain[0].Invoke(saga, sagaStep, stepData);
}
static ISagaStep getChildNextStep(
ISagaStep step)
{
if (step.ChildSteps.Any())
{
return(step.ChildSteps.GetFirstStep());
}
return(null);
}
public SagaBuilderState(Type currentEvent, string currentState, ISagaModel model,
IServiceProvider serviceProvider, UniqueNameGenerator uniqueNameGenerator, ISagaStep parentStep)
{
CurrentEvent = currentEvent;
CurrentState = currentState;
Model = model;
ServiceProvider = serviceProvider;
UniqueNameGenerator = uniqueNameGenerator;
ParentStep = parentStep;
}
public ISagaStepBuilder <TContext> With_Roll_Back_Action_On_Error(ISagaStep <TContext> compensateStep)
{
if (Steps.Any())
{
var lastStep = Steps.Last();
lastStep.CompensateStep = compensateStep;
}
return(this);
}
