<AWT Dev> <Awt Dev>  Review Request for 8022057: JFileChooser blocks EDT in Win32ShellFolder2.getIcon
semyon.sadetsky at oracle.com
Mon Jun 1 15:02:17 UTC 2015
On my laptop both calls are always very fast even when I open a USB
drive dir with many files.
Probably it is very rare situation but Netbeans reported it several
times and people complains on delays of tens of seconds. I could not
I made a guess that following MS recommendations can eliminate delays +
I added Windows libraries icons.
On 6/1/2015 5:41 PM, Anton V. Tarasov wrote:
> Hi Semyon,
> The idea of the fix looks ok to me.
> On 28.05.2015 9:44, Semyon Sadetsky wrote:
>> Please review fix for JDK9:
>> bug: https://bugs.openjdk.java.net/browse/JDK-8022057
>> webrev: http://cr.openjdk.java.net/~ssadetsky/8022057/webrev.00/
>> The full story can be found in the jira's comments and NetBeans
>> tracker (https://netbeans.org/bugzilla/show_bug.cgi?id=188001).
>> It seems the bug proposes to change the design of the AWT shell
>> support on Windows platform. But instead I tried to eliminate the
>> user experience issue it can be a good step to improve the situation.
>> The user experience issue is the JFileChooser spontaneous delays
>> caused by getIcon(): I could not reproduce this under Win7 and
>> jdk8/9. But I found in MSDN that ExtractIcon Win32 API call can take
>> significant amount of time in some cases. Mostly when the file is an
>> executable or a link and its icon is not cached yet.
>> MS propose a way how to avoid that: use asynchronous flag GIL_ASYNC
>> with GetIconLocation call which then may return E_PENDING which means
>> consequent ExtractIcon call can take time. There are several ways to
>> handle E_PENDING return I propose just to use the default icon for
>> the file which can be obtained with GIL_DEFAULTICON flag and should
>> be much faster. Since I cannot reproduce the issue I don't know how
>> effective it will be.
> But did you simply try to load with GIL_DEFAULTICON for a sanity
> check? Is it really much faster?
>> Also in the fix I added possibility to get Windows-Libraries icons,
>> which were not available before in the JFileChooser.
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