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Is there a way to delete the data EList (Xcore) from my tableviewer faster? [message #1828265]

Fri, 05 June 2020 08:20

Patrick Kremer

Messages: 1
Registered: June 2020

Junior Member

Hi,
i connected a table viewer to an EList (xcore) via databinding.

ObservableListContentProvider listContentProvider = new ObservableListContentProvider();
IObservableMap[] observeMaps = EMFObservables.observeMaps(listContentProvider.getKnownElements(), new EStructuralFeature[]{Literals.TEST1__NAME});
tableViewer.setLabelProvider(new ObservableMapLabelProvider(observeMaps));
tableViewer.setContentProvider(listContentProvider);
//
IObservableList testInputObserveList = EMFObservables.observeList(Realm.getDefault(), test, Literals.TEST__INPUT);
tableViewer.setInput(testInputObserveList);

I have a lot of records (+/-4000 Entrys) in my table and i want to delete them with the code clear(), the deletion process takes several seconds.

test.getInput().clear();

Is there a way to delete the data from my table faster?

thanks

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Re: Is there a way to delete the data EList (Xcore) from my tableviewer faster? [message #1828292 is a reply to message #1828265]

Sat, 06 June 2020 03:47

Ed Merks

Messages: 33142
Registered: July 2009

Senior Member

Looking at the implementation I expect that a single notification is produced and handled by this part of the code to compute the diff:

https://git.eclipse.org/c/emf/org.eclipse.emf.git/tree/plugins/org.eclipse.emf.databinding/src/org/eclipse/emf/databinding/EObjectObservableList.java#n112

I expect that part is O(n) to compute the list of diffs. The diff is then fired here:

https://git.eclipse.org/c/emf/org.eclipse.emf.git/tree/plugins/org.eclipse.emf.databinding/src/org/eclipse/emf/databinding/EObjectObservableList.java#n150

And after that the observer implementation does all the work and if it's that slow, likely there is some O(n^2) work being done there.

But I see no special support for "clear" in the platform's data binding framework, so there is nothing I see that you can optimize at your end or that I can optimize in the EMF framework in this regard.

In the end, to optimize anything like this, one would need to measure where the costs are with a profiler. YourKit is very good...

Ed Merks
Professional Support: https://www.macromodeling.com/

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