Hi Mark Renouf
Thank you for reply.
Let me try to give an example (maybe not very appropriate).
I create tree on page. I get data for that tree from server. I can get
data for all tree nodes to construct tree, or make new requests to
server when user opens new nodes. Suppose whole tree is too big to
load it all. User opens and closes nodes during his work. I can free
memory resources connected with closed nodes (eliminate references)
immidiately, but what if user opens it again? Then application needs
to make new request to server. I want to avoid it. I want to let js
engine garbage collect data only when it's not enough memory. If it
were desktop java application I would use java.lang.ref.SoftReference.
It is similar to regular reference to java object, it has get() method
to get object that it holds, but that object can also be garbage
collected when application needs memory. So I just call get() and if
it returns null I recreated object (request it from server, read it
from file, etc.).
So, I was asking about something similar in GWT. Thinking about it
again, I can see that that feature should be supported by browser's js
gc engine, which is doubtful. Anyway, thank you for your help!
On 24 апр, 19:00, Mark Renouf mark.ren...@gmail.com wrote:
Garbage collection in JavaScript is browser-dependent, but similar
rules apply as with Java. When you are no longer using the data, make
sure you eliminate all references to it. For example, if you've stored
it in an Array or Collection of some sort, be sure to null out or
remove those entries. The browser's JavaScript engine will do it's
best to garbage collect that data (some better than others
obviously).
GWT goes to great lengths to do this for you as automatically as
possible. For example, if you perform an AJAX request for a chunk of
HTML and insert it into an HTML widget, insert it into the page, then
later remove it, GWT ensures that the element is cleanly detached from
the DOM and the Widget object is removed from it's parent. Assuming
you haven't stored it elsewhere (usually not), it will be eligable for
garbage collection.
Others can probably tell you which browsers to watch out for (IE6?),
and some pitfalls that might cause problems (circular references?)
On Apr 23, 6:41 am, zold...@gmail.com zold...@gmail.com wrote:
I have GWT application. Use loads page, then visits links (I use GWT's
Hyperlink, so page is not reloaded). Amount of data that page contain
is increased (I use AJAX requests to get data from server). I have
some data that shouldn't necessarily exist always, I can load it from
server again. Is there any way I can tell js engine that it can be
garbage collected? Something similar to java.lang.ref.SoftReference?
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