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to be or not to be? is disposing correct? [message #463668]

Wed, 14 February 2007 05:13

Eclipse User

Originally posted by: peter_ossipov.mail.ru

Hello everybody!
I have a class-singleton for my application that manages caching images
in my application. I dispose it this way. Is it correct to do it like
that? Or should I dispose it when the bundle stops?
private ImageMaker()
{
// do not forget to free all the system resources
PlatformUI.getWorkbench().addWorkbenchListener(new
IWorkbenchListener()
{

public void postShutdown(IWorkbench workbench)
{
dispose();
PlatformUI.getWorkbench().removeWorkbenchListener(this);
}

public boolean preShutdown(IWorkbench workbench, boolean forced)
{
return true;
}
});
}

/**
* dispose all cashed images
*
*/
private void dispose()
{
for (Iterator iter = imagesCache.values().iterator();
iter.hasNext();)
{
Image image = (Image)iter.next();
image.dispose();
}
imagesCache.clear();
}

Re: to be or not to be? is disposing correct? [message #463670 is a reply to message #463668]

Wed, 14 February 2007 05:26

Eclipse User

Originally posted by: 11235813.despammed.com

Peter Osipov schrieb:
> Hello everybody!
> I have a class-singleton for my application that manages caching images
> in my application. I dispose it this way. Is it correct to do it like
> that? Or should I dispose it when the bundle stops?

Why don't you use an ImageRegistry instead? Then you don't have to think
about disposing the images by yourself.

Carmen

Re: to be or not to be? is disposing correct? [message #463671 is a reply to message #463668]

Wed, 14 February 2007 05:27

Eclipse User

Hi,

Why don't you simply use ImageRegistry and let it handle the disposing
for you? You can use JFaceResources.getImageRegistry() to even share
your images across plugin boundaries ;-)

Tom

Peter Osipov schrieb:
> Hello everybody!
> I have a class-singleton for my application that manages caching images
> in my application. I dispose it this way. Is it correct to do it like
> that? Or should I dispose it when the bundle stops?
> private ImageMaker()
> {
> // do not forget to free all the system resources
> PlatformUI.getWorkbench().addWorkbenchListener(new
> IWorkbenchListener()
> {
>
> public void postShutdown(IWorkbench workbench)
> {
> dispose();
> PlatformUI.getWorkbench().removeWorkbenchListener(this);
> }
>
> public boolean preShutdown(IWorkbench workbench, boolean forced)
> {
> return true;
> }
> });
> }
>
> /**
> * dispose all cashed images
> *
> */
> private void dispose()
> {
> for (Iterator iter = imagesCache.values().iterator();
> iter.hasNext();)
> {
> Image image = (Image)iter.next();
> image.dispose();
> }
> imagesCache.clear();
> }

Re: to be or not to be? is disposing correct? [message #463672 is a reply to message #463671]

Wed, 14 February 2007 05:49

Eclipse User

Originally posted by: peter_ossipov.mail.ru

Yep, I thought about it actually. But by the time I found out about this
registry - the current way had been done, so do not want to change to
registry if the current way is OK. Just too much to do apart from
polishing the code. :-)
Tom Schindl wrote:
> Hi,
>
> Why don't you simply use ImageRegistry and let it handle the disposing
> for you? You can use JFaceResources.getImageRegistry() to even share
> your images across plugin boundaries ;-)
>
> Tom
>
> Peter Osipov schrieb:
>
>> Hello everybody!
>> I have a class-singleton for my application that manages caching images
>> in my application. I dispose it this way. Is it correct to do it like
>> that? Or should I dispose it when the bundle stops?
>> private ImageMaker()
>> {
>> // do not forget to free all the system resources
>> PlatformUI.getWorkbench().addWorkbenchListener(new
>> IWorkbenchListener()
>> {
>>
>> public void postShutdown(IWorkbench workbench)
>> {
>> dispose();
>> PlatformUI.getWorkbench().removeWorkbenchListener(this);
>> }
>>
>> public boolean preShutdown(IWorkbench workbench, boolean forced)
>> {
>> return true;
>> }
>> });
>> }
>>
>> /**
>> * dispose all cashed images
>> *
>> */
>> private void dispose()
>> {
>> for (Iterator iter = imagesCache.values().iterator();
>> iter.hasNext();)
>> {
>> Image image = (Image)iter.next();
>> image.dispose();
>> }
>> imagesCache.clear();
>> }
>>

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