public async Task <IPipelineExecutionContext> Execute(IPipelineExecutionContext executionContext, CancellationToken cancellationToken = default)
{
if (executionContext == null)
{
throw new ArgumentNullException(nameof(executionContext));
}
var behaviors = ResolveBehaviors();
foreach (var step in _stepDescriptors)
{
ExecuteStepDelegate @delegate = s_boundDelegates.GetOrAdd(step.Id, _ => step.CreateDelegate());
await ExecuteStep(step, executionContext, cancellationToken, @delegate, behaviors);
}
return(executionContext);
}
private Task ExecuteStep(StepDescriptor step, IPipelineExecutionContext executionContext, CancellationToken cancellationToken, ExecuteStepDelegate @delegate, IPipelineBehavior[] behaviors)
{
var stepInstance = _factory(step.TypeInfo);
executionContext.CurrentStep = stepInstance;
Func <CancellationToken, Task> currentFunc = token => @delegate(stepInstance, executionContext, _namingStrategy, _unknownParameterBehavior, token);
for (var i = behaviors.Length - 1; i >= 0; i--)
{
var behavior = behaviors[i];
var previousFunc = currentFunc;
currentFunc = token => behavior.Handle(executionContext, cancellationToken, previousFunc);
}
return(currentFunc(cancellationToken));
}
