John Dickinson wrote:
In answer to your first set of questions, ajax_response() waited to
see if anything would show up in the response bucket that needed to be
sent to the client. Once something showed up, it was send down the
pipe to the client, and the connection was closed.
What kind of thing shows up? I don't see the application...
The client would then reopen the connection the ajax_response to see
if anything else was on the server that needed to be processed on the
client side.
But, that was an inefficient implementation. I would suggest that the
newer implementation I posted this morning be used instead. I'm sure
that it can still be improved upon, but it is better (for webware's
threads) than the older implementation used in the AjaxSuggest example
page.
In your previous mail, you explain that the client wait for some
amount of time. Wait for what?
In the newer implementation, the client waits so as not to hammer the
server with requests as fast as possible. If that were allowed, it
would amount to the site developer willingly subjecting themselves to
a DDOS. The client timeout allows the servers some time between
requests. Essentially, the client wakes up every few seconds and asks
the server if any new data is available. The server then responds
immediately. If there was something to give to the client, then that
is sent back. If there is nothing to give back to the client, nothing
is send back besides the number of seconds for the client to wait
until it asks the server for results again.
Check out the code: wiki.w4py.org/ajax_in_webware.html.
I think I understand now.
The client is polling the server for new data that could come up because
of external events.
If I understand correctly, this kind of application is useful for a
certain class of websites like chat, real time data updating (like stock
quotes), etc..
In majority of ajax applications, such polling might be useless isn't it?
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