private int CheckDecision(int flowStepIndex, DecisionFlowStepBase decisionFlowStep, FlowDefinition <TFlowRequest, TFlowResponse> flowDefinition,
FlowContext stepFlowContext, FlowValues flowValues, FlowTrace flowTrace)
{
var decisionRequest = (FlowDecisionBase)CreateRequest(stepFlowContext, decisionFlowStep, flowValues);
// TODO: Pass the targets directly into GetMatchingBranchIndex
decisionFlowStep.Branches.ForEach(b => decisionRequest.AddBranch(b.Targets));
_logger?.LogDecisionRequest(stepFlowContext, decisionRequest);
var branchIndex = decisionRequest.GetMatchingBranchIndex();
if (branchIndex < 0 || branchIndex >= decisionFlowStep.Branches.Count)
{
throw new FlowException($"The branch index returned was out of bounds of the branch array: {branchIndex}");
}
var branch = decisionFlowStep.Branches[branchIndex];
flowTrace.AddStep(new FlowTraceStep
{
StepType = FlowTraceStepType.Decision, Name = decisionFlowStep.Name, BranchTargets = branch.Targets
});
_logger?.LogDecisionResponse(stepFlowContext, branch);
if (branch.IsEnd)
{
return(int.MaxValue);
}
if (branch.IsUnhandled)
{
throw new FlowUnhandledElseException($"Unhandled ELSE for decision '{decisionFlowStep.Name}'");
}
var isContinue = (branch.NextStepName == null);
if (isContinue)
{
return(flowStepIndex + 1);
}
var nextFlowStepIndex = flowDefinition.GetStepIndex(branch.NextStepName);
return(nextFlowStepIndex);
}
private async Task <int> PerformFlowStep(FlowContext stepFlowContext, FlowDefinition <TFlowRequest, TFlowResponse> flowDefinition, FlowStep flowStep,
int flowStepIndex, FlowValues flowValues, FlowTrace flowTrace, CancellationToken cancellationToken)
{
int nextFlowStepIndex;
switch (flowStep)
{
case ActivityFlowStep activityFlowStep:
await DoActivity(
activityFlowStep, stepFlowContext, flowValues,
flowTrace, cancellationToken);
nextFlowStepIndex = flowStepIndex + 1;
break;
case DecisionFlowStepBase decisionFlowStep:
nextFlowStepIndex =
CheckDecision(
flowStepIndex, decisionFlowStep, flowDefinition, stepFlowContext, flowValues,
flowTrace);
break;
case GotoFlowStep gotoFlowStep:
_logger.LogGoto(stepFlowContext, gotoFlowStep.NextStepName);
nextFlowStepIndex = flowDefinition.GetStepIndex(gotoFlowStep.NextStepName);
break;
case LabelFlowStep _:
RecordLabelStep(flowTrace, stepFlowContext);
nextFlowStepIndex = flowStepIndex + 1;
break;
case EndFlowStep _:
nextFlowStepIndex = int.MaxValue;
break;
default:
throw new FlowException(
$"Unexpected flow activityFlowStep type {flowStep.GetType().FullName}");
}
return(nextFlowStepIndex);
}
