Hello All,
My web application uses the default request cycle render strategy
IRequestCycleSettings.RenderStrategy.REDIRECT_TO_BUFFER.
An external web site calls a web page on my web application using a URL with
page parameters (all of which I set before I hand over to the external web
site). I find that the relevant WebPage constructor gets called twice during
the request-response process, which I presume is expected behaviour: once to
handle the action part of the request, again to handle the render part of
the request.
In the past, I bypassed this issue by showing an option with an "OK" button
for action, so it didn't matter if the page constructor was called twice; no
persistence code got executed until the user clicked "OK" subsequently.
Now, however, I need to act on the request from the external web site
straight away, in order to ensure that the database is updated before the
user moves to another page without clicking "OK" (or away from my
application altogether). Currently, I code this to happen in the page's
constructor, so my database persistence code get called twice too. Not good,
especially with Google App Engine, which does not like rapid updating of the
same persistent "entity group".
My question is: is there a (simple) way for me to know whether my page is
being constructed during the action part of the request as opposed to the
render part of the request?
(I have a work-around in mind, which is to store relevant details in the
session, and use a check on these to prevent a second database persistence
operation for the same data, but I would have thought that a simpler, more
direct solution exists.)
Any hints would be greatly appreciated.
MY DEVELOPMENT ENVIRONMENT
Web framework: Wicket 1.5.7
Java: 1.6.0_33; Java HotSpot(TM) Client VM 20.8-b03
Web server system: Google App Engine for Java version 1.6.6
Operating system: Microsoft Windows XP Home Edition version 2002 SP3
(version 5.1 running on x86; Cp1252; en_GB) (nb)
IDE: NetBeans IDE 7.1.2 (Build 201204101705)
Ian Marshall
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