yes you should also do the caching then. But that is the response
ability of the subclass.
if you want caching support for removing the cache. Then we could make
an invalidate() method on DynamicImageResource
that you can implement if you want.
Gili wrote:
This isn't enough. You want to cache the resulting data because it
is expensive to generate. All in all, the StreamedImageResource I sent
consists of as many lines of code as either BufferedImageResource or
RenderedImageResource and it has a decent use-case. I'm pretty sure
that anyone who stores their dynamic images outside of memory will
want to use this.
Gili
Johan Compagner wrote:
just subclass DynamicImageResource
and implement getImageData() (where you acccess the db to get the
byte[])
Gili wrote:
On a related topic...
I'm retrieving DynamicImageResources (images) from the DB and I
want to render them... now, I can't use BufferedDynamicImageResource
because I wish for the images to be lazily initialized (they're
large) and I can't use RenderedDynamicImageResource because I don't
know their dimensions ahead of time (again, I don't want to poll the
DB until I have to).
A while back I asked Jon to add a DynamicImageResource that
would allow me to do something like this and I guess back then I
didn't have a good use-case but now I think I do. If I create a new
type of DynamicImageResource to meet these requirements, would you
consider adding it to core?
It would basically be a DynamicImageResource whose
getImageData() must be overriden (to render the image lazily) but it
caches the resulting data so it doesn't need to be re-rendered on
future hits. This is a hybrid of the two preexisting
DynamicImageResources. What do you think?
Gili
Gili wrote:
You are right. Thank you for clarifying :)
Gili
Johan Compagner wrote:
because rendered can be re rendered when the image data is null
Buffered can't that just holds the array. And flushing or making
it transient doesn't make any sense
Because it can never generate it again..
johan
Gili wrote:
Hi,
Why is RenderedDynamicImageResource's data transient but
BufferedDynamicImageResource's data not?
Gili
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