ActiveStateChanged triggers on recycle

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Kasper Pedersen

Posted on 14/11/2024 09:17:04

Hello,

I have an issue, where my application keeps failing when i am releasing and the app recycles.

I've located the issue in a NotificationSubscriber on Standard.Page.ActiveStateChanged Notification.

We use this to make an api call to our CDN provider and clear the cache of the page that becomes inactive.

I then found that the error on application start is a stack overflow error because we send a api request for each inactive page on the site.

Is there a way to make sure that our NotificationSubscriber is not triggered on application start or recycle for every page in the application?

I am on DW 9.17.4 for reference

Thanks

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Nicolai Pedersen

Posted on 14/11/2024 12:21:33

Hi Kasper

It comes from a check on the property of active when we load it from the database. Default value of that property is true when we contruct a new page and then we set it to false when loading pages from database if they are set to false there - this cause a notification for each page being loaded from DB. We whould change that behavior as that is not how it is meant to behave.

On your solution and version, you can do a Application.BeforeDynamicwebStart notification subscriber and set a value on a static variable that the solution is starting, and then in your statechanged notification check if that static variable is true. Then in the end, create a notification subscriber for Application.AfterDynamicwebStart that sets that variable to false again....

Kasper Pedersen

Posted on 14/11/2024 12:56:06

Hi Nicolai,

Thank you for the response :)

I will try and implement your work around for the time being :)

Kasper Pedersen

Posted on 14/11/2024 14:34:34

Hi again Nicolai,

I tried your suggestion but this doesn't work as the ActiveStateChanged doesn't trigger until after the AfterDynamicwebStart notification.

I added some logging:

....

Do you have another suggestion or another observer I could use to automatically prevent it from triggering?

Nicolai Pedersen

Posted on 14/11/2024 14:41:07

Are you using Application.BeforeStart and Application.AfterStart or Application.BeforeDynamicwebStart and Applicatino.AfterDynamicwebStart?

An alternative to AfterDynamicwebStart is to use Standard.Application.BeforeEndRequest and set Models.Variables.SolutionIsStartingUp to false if it is true

Kasper Pedersen

Posted on 14/11/2024 14:44:34

I am using, Application.BeforeDynamicwebStart and Applicatino.AfterDynamicwebStart.

I wil try out the BeforeEndRequest method :)

Kasper Pedersen

Posted on 14/11/2024 15:01:43

Hello again,

I am sorry to say but this doesn't solve the issue as it still triggers before the active state changed.

...

Nicolai Pedersen

Posted on 14/11/2024 15:39:04

You probably have different things hitting - or the IIS startup page or something.

Maybe set a startup timestamp on BeforeStartUp and do not execute inside ActiveStateChanged unless startup time is at least 60 seconds ago or similar. Or use the timestamp inside BeforeEndRequest to not set the SolutionIsStartingUp to false before a minut has passed.

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ActiveStateChanged triggers on recycle

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