Martijn Dashorst created WICKET-6055:
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Summary: AjaxLazyLoadPanel should provide non-blocking lazy load
Key: WICKET-6055
URL: https://issues.apache.org/jira/browse/WICKET-6055
Project: Wicket
Issue Type: Improvement
Components: wicket-extensions
Affects Versions: 7.1.0
Reporter: Martijn Dashorst
Assignee: Martijn Dashorst
When having multiple AjaxLazyLoadPanels on your page, they all block their
Wicket request thread until the content is ready to load. This can be
problematic when you try to wait for some background job to finish and want to
poll for that job to be ready, and only then update the contents.
The improvement would be to add a method that gives the developer the option to
not update just yet (isReadyForReplacement) and when it returns true, start the
replacement. By default this would return true, implementing the current
behavior of the AjaxLazyLoadPanel.
Furthermore to improve the responsiveness of the ALLP it should add a single
timer to the page that can be used by multiple ALLPs to update themselves. The
timer would poll each second and the ALLPs would use Wicket's event bus to
update themselves. With some reference counting, the timer can remove itself
from the page when all ALLPs have updated themselves.
This enables refreshing the page as well when outside an AJAX context, or
having a user be impatient and pressing F5.
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