I need the status on the server (new, deleted, modified), so I must wait
with the modification until I know the objects have been serialized.
Even though Javascript is single threaded, the actual RPC-call is done
with a separate XMLHttpRequest-object, I'm uncertain if the objects are
safe on the code line right after the actual RPC-call. The easiest (at
least for me, but probably also Google) would be if they were. But how
would I know?
On 25. mars 2011 03:26, Craig Mitchell wrote:
Javascript is single threaded, so you can just mark them as clean just
before you send them. IOW. It won't be possible for them to be
updated between when they are marked as clean, and when the call to
save starts.
If the save fails, just mark them back to being modified.
Note: During the save process on the server, they can be modified.
On Mar 24, 4:19 am, Martin Larsson<[email protected]>
wrote:
We're experimenting with background saving in our GWT-app. IOW. we
mark objects as 'modified', and then at regular intervals, find all
modified objects and pass them to the database for storage. The
question is when is it safe to mark the object as 'clean'. The on-
success-handler of the save()-method is too late, obviously. That can
happen any time later and the user might have modified the object(s)
again. As the status also can be 'new' or 'deleted', I need to pass
the status to the server so it knows what to do. IOW. I can't mark the
object clean too early. What I'd like is to mark them 'clean' when
they're safely serialized, and have the on-failure-handler set them
back to 'modified' if the save() failed.
So ... is there any point in the code where I can be certain that the
objects are serialized and on their way to the server so I can start
modifying them in the client without interfering?
Figure 4 here:http://eclipse.dzone.com/news/making-gwt-remote-procedure-ca
indicates that the objects are safe once the method in *Async returns.
Is that safe?
M.
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