Does pressing F5 in the chart immediately terminate the strategy?

[jetheil2]

Hello,

When each bar arrives, the strategy will go through onbarupdate again.
Suppose the strategy is very complex and takes a long time. For example, it takes 5 seconds to complete the logic in the onbarupdate.
During the 5-second calculation, I'm pressing F5 from the chart.
I want to know whether the strategy waits for the onbarupdate to complete before terminating, or Terminate immediately (for example, when a statement inside onbarupdate is run, it is terminated immediately).

Because I have txt file output as shared variable between charts, I am worried that there will be problems with F5. For example, if a part of file is output, I don't know what will happen.

Thankyou

[NinjaTrader_ChelseaB]

Hello jetheil2,

Once OnBarUpdate() is run, there is no abort in this. Disabling a script will prevent the next OnBarUpdate cycle and begin cloning and disposing once all current market / order events have completed.

[jetheil2]

Hello ChelseaB,

The post below:

https://ninjatrader.com/support/foru...ate#post451254
https://ninjatrader.com/support/foru...s-on-f5-repeat


It seems to say that OnBarUpdate() terminates immediately when F5 is pressed.
He said that sometimes, I haven't tested in detail
But this was many years ago.


Thank you for your help.

[NinjaTrader_ChelseaB]

Hello jetheil2,

The first post is describing how the script will start disposing resources while OnBarUpdate() is still running as the State of script becomes Terminated. It does not abort that pass of OnBarUpdate() which does finish running.

[jetheil2]

Hello ChelseaB,

What I should consider is:

1.
Disposing resources when Terminated (when I press F5 on the chart), xxx1.dispose, xxx2 = null will happen
( If I write "xxx1.dispose, xxx2 = null" in (State == State.Terminated){ xxx1.dispose , xxx2= null } , )
While OnBarUpdate() is executing the last time, A null pointer exception will occur.

2.
But if I don't write anything in State == State.Terminated{ }, will it still generate a null pointer exception (or the resource is released early)?


Is that right?

Thankyou

[NinjaTrader_ChelseaB]

Hello jetheil2,

A null pointer exception would only occur if you try and use a variable that has a null value. Checking the variable is not null first can avoid that error.

if (myObject != null)
{
// do something with myObject)
}

[jetheil2]

Hello ChelseaB,
thank you for your help.

I was thinking that when F5 is pressed, OnStateChange will be called and will go to on(State == State.Terminated), which may Disposing resources early and empty some variables,
Is what I said in item 2 of the above post correct?

[NinjaTrader_ChelseaB]

Hello jetheil2,

Only NinjaTrader resources would be disposed.

The script would run OnStateChange() as the next instruction from the script thread.

[jetheil2]

Hello ChelseaB,

"Only NinjaTrader resources would be disposed."
What does NinjaTrader resources refer to?



"The script would run OnStateChange() as the next instruction from the script thread."

Sorry, I didn't understand. Can you explain briefly? Thank you

[NinjaTrader_ChelseaB]

Hello jetheil2,

As an example, if you have your own custom class and an object instantiated that implements the Dispose method, that object would not be disposed automatically unless the entire script instance is disposed which would be after State.Terminated has finished.

An example class I can think of would be StreamReader / StreamWriter.

https://ninjatrader.com/support/helpGuides/nt8/using_streamreader_to_read_fro.htm

NinjaTrader resources would be things like orders, the renderTarget, market data, etc. Things that are part strategy class that are not held until the end of State.Terminated that you would not explicitly call Dispose on.

[jetheil2]

Hello jetheil2,

As an example, if you have your own custom class and an object instantiated that implements the Dispose method, that object would not be disposed automatically unless the entire script instance is disposed which would be after State.Terminated has finished.

An example class I can think of would be StreamReader / StreamWriter.

https://ninjatrader.com/support/helpGuides/nt8/using_streamreader_to_read_fro.htm

NinjaTrader resources would be things like orders, the renderTarget, market data, etc. Things that are part strategy class that are not held until the end of State.Terminated that you would not explicitly call Dispose on.

Thank you for the explanation.
I would use File.XXX, try to avoid StreamReader/StreamWriter, they need to be dispose manually.


".....object would not be disposed automatically unless the entire script instance is disposed which would be after State. Terminated has finished."

if OnBarUpdate() is running, the entire script instance will not disposed, although State.Terminated may have finished.
am i right?

Thank you

[NinjaTrader_ChelseaB]

Hello jetheil2,

The strategy would not reach State.Terminated until after the in-progress pass of OnBarUpdate().

The script instance will not be disposed until after OnStateChange() has completed it's pass of State.Terminated. (or in some cases, will not be disposed of at all)

[jetheil2]

Hello ChelseaB,

Hello jetheil2,

The strategy would not reach State.Terminated until after the in-progress pass of OnBarUpdate().

If the OnBarUpdate() is still running and i press F5 in the chart, won't the strategy reach State.Terminated?

[NinjaTrader_ChelseaB]

Hello jetheil2,

It will and OnStateChange() will update with the Terminated state once any in progress methods finish their pass and the script is ready for teardown.