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Limiting the time the IRunAndRenderTask runs [message #1282812]

Wed, 02 April 2014 20:25

Olly

Messages: 61
Registered: June 2010
Location: Florida

Member

I am currently using Birt 3.7.1 with no option to upgrade. Currently what is happening is if I try to create a PDF report via my web application that contains anything above 5,000 records, it takes about three and a half minutes. But if a user tries to create a PDF report with 50,000 records, it takes too long and causes stuck threads on the WebLogic server where it is running. Now, I found in the IRunAndRenderTask API the setmaxrowsperquery option. This is an option for the moment, but I'd like to know if there is a way to set the engine to die or kill itself after 5 minutes or so. I didn't see this in the API. Any help is greatly appreciated. In the long run, we may create materialized views that aggregate the data, but for the short term, I need a quicker fix.

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Re: Limiting the time the IRunAndRenderTask runs [message #1284334 is a reply to message #1282812]

Fri, 04 April 2014 10:59

donino donino

Messages: 183
Registered: July 2011

Senior Member

All BIRT tasks such IRunAndRenderTask have a ".cancel()" method we can invoke to interrupt it.

I don't believe there is an out-of-the-box timeout feature, however this might be implemented quickly. I plan to contribute soonly to the BIRT project with a such TaskManager, here is what i have in mind:

- A method "register" allowing to store birt tasks on demand in a WeakHashMap, with the starting time
- A java.util.TimerTask, scanning periodically all tasks registered. For each entry:
- if the task is still active and maxtime is exceeded, then we invoke task.cancel()
- if the task is terminated or null then we remove the entry from the map

That's it. If you make use of the reportEngine API it should be quite fast to implement. With a such approach you could even add a "getActiveTasks()" method to inspect what's going on in your BIRT engine!

I hope it helps

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