[WICKET-5732] Improve component queuing and auto component

• Type: Task
• Status: Resolved
• Priority: Critical
• Resolution: Implemented
• Affects Version/s: 7.0.0-M3
• Fix Version/s: 7.0.0-M5
• Assignee: Andrea Del Bene
• Reporter: Andrea Del Bene
• Created: 21/Oct/14 16:51
• Updated: 08/Nov/14 15:43
• Resolved: 08/Nov/14 15:43

Description

One of the new feature implemented in Wicket 7 is component queuing (see https://www.42lines.net/2014/02/28/component-queueing-in-wicket-7).
Amongst other things, component queuing is aimed to improve auto components usage.
The current implementation of component queuing has raised some issues (WICKET-5730, WICKET-5724) which might make impossible for a Wicket application to migrate from 6.x to 7.x.
As a consequence I've tried to find a solution that could solved the encountered issues without changing the expected behavior for component queuing. The solution can be seen in the new branch 'improvingQueuing' (https://github.com/apache/wicket/tree/improvingQueuing).

However, this solution comes at the price of changing the current way Wicket handles auto component. So far Wicket removes auto components added during rendering phase after this latter has finished. On the contrary, my solution implies that auto components must stay in their hierarchy
This is of course quite a big change to Wicket internals, so ad Martin Grigorov suggested, we should discuss it before merging it to master branch.