public Logic(TaskCompletionSource <T> promise, FirstOrDefaultStage <T> stage) : base(stage.Shape)
{
_promise = promise;
_stage = stage;
SetHandler(stage.In, this);
}
public Logic(TaskCompletionSource <T> promise, FirstOrDefaultStage <T> stage) : base(stage.Shape)
{
_stage = stage;
SetHandler(stage.In, onPush: () =>
{
promise.TrySetResult(Grab(stage.In));
CompleteStage();
},
onUpstreamFinish: () =>
{
promise.TrySetResult(default(T));
CompleteStage();
},
onUpstreamFailure: cause =>
{
promise.TrySetException(cause);
FailStage(cause);
});
}