Prevent Watchdog from crashing the app?

I have a webRequest in my widget which is getting a long dictionary, tah must be sorted (see my older topic).

If the webserice response is too large, I get a http errorcode. SO I can show a message to inform the user why it's not possible to show the data.

But in case the response is small enougt, but it's too big for the sorting algorithm, the watchdog is stopping the app.
Is there a possible way to prevent the crash? Somehow with a try/cath around the lung running loop?

I assume, the watchdog is triggered by CPU calls, not by time? So it's even not possible to count the time the sort is running to stop it before the app crashes?

0 jim_m_58 over 2 years ago

The watchdog triggers when you've run too long without returning from your app. One solution could be splitting your sort up so you only do "x" sorts at a time and use a timer to do "x" on a timer tick.

The other thing is look at how you do the sort.

Also note, the watchdog varies by device where it's longer on some devices than others.

0 ronnywinkler over 2 years ago in reply to jim_m_58

Hi Jim,
I can't do this with timers. It's a web request result which should be shown in the view.

Perhaps you remember this discusson :-)
https://forums.garmin.com/developer/connect-iq/f/discussion/302929/dictionary-access-by-index

I'm extracting the time and ID from the dictionary. Then the array is sorted with a bubble sort by time (as moment). I can't show the view without the correct sorted data. Without sort it's not useful.

So it can happen, that a long dictionary is received. My main question was, it I can react before the watchdof is triggered. It would be nice if a exception would be thrown to stop the processing (perhaps with a error message on the screen) instead just stopping the app. But as I've read along in the forum it's not possible this way, right?

0 jim_m_58 over 2 years ago in reply to ronnywinkler

There is no way to catch a watchdog error. It's there to prevent an app from blocking other things from running.

You can probably use a timer, but just display a message in the view if the sort is still occurring.

0 ronnywinkler over 2 years ago

And using a timer, showing a message (with View.requestUpdate) will reset the watchdog counter? Thanks for the suggestion. I'll try this.

0 jim_m_58 over 2 years ago in reply to ronnywinkler

Returning to the VM resets it. So if you sort x from the timer callback and then return to the VM to wait for the next timer tick to do more, it's reset