[WICKET-6769] InMemoryPageStore customizable map implementation

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 9.0.0-M5
• Fix Version/s: 9.0.0
• Component/s: wicket
• Assignee: Sven Meier
• Reporter: Sven Meier
• Created: 13/Apr/20 21:52
• Updated: 16/Apr/20 12:29
• Resolved: 16/Apr/20 12:29

Description

In Wicket 8 PerSessionPageStore utilized SoftReferences to build a cache of pages in cooperation with the GC.

The experts seem to agree that depending on the GC to clean up caches is a bad idea:

https://stackoverflow.com/questions/264582/is-there-a-softhashmap-in-java

http://jeremymanson.blogspot.com/2009/07/how-hotspot-decides-to-clear_07.html

Instead of replicating the old feature, the new InMemoryPageStore should allow to be customized with a map implementation. This allows applications to utilize different map-based caches, e.g. https://github.com/ben-manes/caffeine

Issue Links

• relates to: WICKET-6563 Rework page and data storage