Hi *,
We built an app which has a base page, and several child pages which
inherit from the base page.
The app is themeable, and one of the requirements of the app is/was that
these themes should be manageable.
This means we have a set of themes which can be changed on-the-fly.
To add flexibility to our app, a theme can override the html of the base
page.
To handle the custom html, our base page implements
IMarkupResourceStreamProvider and IMarkupCacheKeyProvider.
Every user of the app can select a theme, so the theme is determined per
request.
The cache key is generated based on the theme id and the container class:
@Override
public String getCacheKey( MarkupContainer container, Class< ? >
containerClass )
{
final Theme theme = getWebsite().getTheme();
return "Theme#" + theme.getId() + "-" + containerClass.getName();
}
The markup resource stream is only "overriden" for the base page:
@Override
public IResourceStream getMarkupResourceStream( MarkupContainer
container, Class< ? > containerClass )
{
final Theme theme = getWebsite().getTheme();
if( containerClass.equals( WebsiteLayout.class ) )
{
String markup = theme.getMarkup();
return new StringResourceStream( markup, "text/html" );
}
return defaultResourceStreamProvider.getMarkupResourceStream(
container, containerClass );
}
(where defaultResourceStreamProvider is a
DefaultMarkupResourceStreamProvider instance).
The problem we are facing is that when the user switches to a different
theme, they keep seeing the html code of the previously selected theme.
Debugging shows that when the theme is changed:
- getCacheKey is hit for both the child page and the base page
- getMarkupResourceStream is hit for both the child page and the base page
I think it could be due to the way wicket's
DefaultMarkupResourceStreamProvider handles inheritance: maybe it (too)
caches the base page markup?
Can anyone help with this? How do we properly cache dynamic html for a
base page which is used by several (static) child pages?
Thanks!
--
Met vriendelijke groet,
Kind regards,
Bas Gooren
