hello again,
following my last mail.
It is difficult the explain the problems because they are inconsistent, but
I'll try:
I use to update my dynamic pages with WTimer. I have 3 dynamic pages with very
big tables.
On timer tick I clear the table content and fill in new elements. Apparently
the tables were very big and update time was too long so the browser window
stucked until the refresh.
So I decided to change the method to server push.
I have a cyclic thread that emits the signal whenever needed. The pages
register the signal in the Ctr.
the errors are different:
- vector subscript out of range (call stuck: WContainerWidget:: updateDom() -->
server::connection::handleReadyBody()).
- map/set iterator incompatible.
- sometimes a popup appears with : "wt internal error : [object error], code
undefined, description, object required"
I suppose there is parallel access to a member of the application.
I take the application lock before updating and use triggerUpdate when I
finish. the update contains clearing 2 tables and filling in them with new
elements. I do the same as in the SimpleChat example.
As I wrote last time, I use the same method with the WTimer and it works fine.
I also tried to use the WTimer to just emit the signal and it works fine. This
way would have pleased me, but strangely it works slow too - I suppose that
when it emits the signal there is a context switch before the method of the
WTimer returns (maybe because of high priority of handling signal).
Again, I know it is not very informative, but please think how to guide me what
to do in order to solve it.
Hadas
-----Original Message-----
From: omer katz [mailto:[email protected]]
Sent: Wednesday, January 13, 2010 1:27 PM
To: [email protected]
Subject: Re: [Wt-interest] server push problems
My first sugesstion is to create a separate branch and try to compile it with
the newest version.
My second suggestion is if possible show us the error log and the code that
causes the errors.
Is it a segfualt? Is it a deadlock? What kind of errors are you guys getting?
It doesn't work! doesn't really help us.
Omer Katz
2010/1/13 HADASS YAARI <[email protected]<mailto:[email protected]>>
Hello everybody,
In order to accelerate updates of dynamic pages and due to your recommendation,
I changed 3 dynamic pages from updating by WTimer to updating by server push.
I added a signal and a cyclic thread that emits it whenever needed. The 3 pages
(container widgets) connect to the signal in the Ctr.
I use the same method to update the page that I used with the Wtimer.
I don't know why but the application collapse when updating. The collapse is
not consistent and also the errors not.
I implemented exactly like in the simpleChat example:
In the Ctr I wrote: WApplication::instance->enableUpdate();
and also connected to the signal.
In the method that is called by the signal emit I wrote:
lock = WApplication::instance->getUpdateLock();
and then I clear 2 tables and inseret new data to them.
afterwards :
WApplication::instance->triggerUpdate();
The collapse is not when calling triggerUpdate but in the methods between
getting the lock and triggerUpdate.
the errors are different everytime. One of the errors was from CreateDomElement
and another one from WebRender::needUpdate().
What's the problem?
the same methods works fine with the WTimer so I guess the problem is not in
the updating table methods.
I use older version of Wt (2.2.3) - If this bug was fixed, please tell me.
Thank you,
Hadas
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