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Clearing cached elements in virtual table [message #657302]

Wed, 02 March 2011 06:20

manasa
Messages: 32
Registered: October 2010

Member

Hi,

I am making use of a virtual table to hold and display a huge result set which is around 7lacs.
And later I try to reset the table to its initial state releasing the 7lac result set using the following code.

tv.getTable().clearAll();
tv.getTable().setItemCount(0);

Ideally setItemCount() should clear the existing cache, as it is setting the cache size to 0.
But I still see the cachedelements holding the huge resultset resulting in performance issues.

Could any clarify how to clear the cached elements in a virtual table.
Thanks in advance,

Regards,
Manasa

[Updated on: Wed, 02 March 2011 06:45]

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Re: Clearing cached elements in virtual table [message #657667 is a reply to message #657302]

Thu, 03 March 2011 10:38

Grant Gayed
Messages: 2131
Registered: July 2009

Senior Member

Hi Manasa,

Table.clearAll() is the correct way to do this at the swt level. To verify
that this is working in your environment you can take
http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/org. eclipse.swt.snippets/src/org/eclipse/swt/snippets/Snippet144 .java
and add a block like the one below that calls clearAll(), then see that the
SetData listener starts being invoked again on items already shown.

table.addListener(SWT.MouseDoubleClick, new Listener() {
public void handleEvent(Event event) {
table.clearAll();
System.out.println("CLEAR ALL!");
}
});

I don't know the jface level too well, but since you're using TableViewer on
top of Table, maybe this needs to be done at the TableViewer level instead?
Does
http://dev.eclipse.org/viewcvs/viewvc.cgi/org.eclipse.jface. snippets/Eclipse%20JFace%20Snippets/org/eclipse/jface/snippe ts/viewers/Snippet030VirtualLazyTableViewer.java?revision=1. 2&view=markup
give any useful clues?

Grant

"manasa" <manasa.priya.c@sap.com> wrote in message
news:ikl8oo$n3v$1@news.eclipse.org...
> Hi,
>
> I am making use of a virtual table to hold and display a huge result set
> which is around 7lacs.
> And later I try to reset the table to its initial state releasing the 7lac
> result set using the following code.
>
>
> tv.getTable().clearAll();
> tv.getTable().setItemCount(0);
>
>
> Ideally setItemCount() should clear the existing cache, as it is setting
> the cache size to 0.
> But I still see the cachedelements holding the huge resultset resulting in
> performance issues.
>
> Could any clarify how to clear the cached elements in a virtual table.
> Thanks in advance,
>
> Regards,
> Manasa

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