OnBarUpdate is called before OnStartUp

[bboyle1234]

Sometimes an indicator loaded by another indicator may run OnBarUpdate a number of times before it runs OnStartUp.

Is there anybody here who can shed some understand on this situation so I can figure out how to work around it?

Thanks, Ben

[bboyle1234]

Here is some code that shows a scenario that may cause the inner indicator to run its OnBarUpdate method before its OnStartUp method

// start indicator code extract

InnerIndicator innerIndicator; // store a reference to the "inner" indicator

protected override void Initialize()
{
    // add an additional one-minute dataseries
    Add(PeriodType.Minute, 1);
}

protected override void OnStartUp()
{
    // create the "inner" indicator on the additional one-minute series and store a reference to it
    innerIndicator = InnerIndicator(Closes[1]);
}

protected overrride void OnBarUpdate()
{
    if (BarsInProgress != 0)
        return;

    // ensure the inner indicator is up to date
    innerIndicator.Update();

    // use data from the inner indicator
}

// end indicator code extract

[sledge]

You could count the # of objects created in the InnerIndicator to see if caching in NT is involved.

Just be sure to decrease the count upon termination.

[bboyle1234]

Hi Sledge, thanks for the suggestion, I have investigated caching before and found the following, correct me if I'm wrong:

Caches are only on a per-indicator basis.
NinjaTrader does not store a global cache of indicators.
Each indicator stores its own private cache of indicators it has already created.
Each indicator does not have access to indicators created and cached by other indicators.

[NinjaTrader_CalH]

Hello Ben,

Thank you for your post.

I have not seen any scenario that does this.

Are you just trying to load one indicator in the first script or are there multiple ones working?

[Harry]

Message deleted to avoid confusion.

[bboyle1234]

Hi Cal, there are often multiple inner indicators loaded by the first script.

[Harry]

Hey Harry, interesting comment. I've been doing it for years in heaps of indicators and it seems to work (except when it doesn't). Can you expand on that? What would you do instead?

Sorrry, I was tired when I answered and my comment was not correct, I have therefore deleted it.

[NinjaTrader_Jesse]

Hello bboyle1234,

I wanted to check, when you see the OnBarUpdate run a number of times before the OnStartUp, is this only when you are storing a indicator such as you posted:

InnerIndicator innerIndicator; // store a reference to the "inner" indicator

I would like to try and recreate what you are experiencing, can you provide an example script for me to check, preferably limited to just the portion of the script that is causing this.

With what you had provided earlier I was unable to recreate this. I have attached the test I have run please review it and verify I am doing the same as you are.

Test2 calls Test in the same way that you had posted originally.

I set my chart for 10 bars to control the amount of prints, I got 20 total print statements, 10 for Test2 and 10 for Test.

I look forward to being of further assistance.