Can the caching mechanism be improved? --------------------------------------
Key: JCR-731 URL: https://issues.apache.org/jira/browse/JCR-731 Project: Jackrabbit Issue Type: Improvement Reporter: Martijn Hendriks Hi all, We've identified the method "getNonVirtualItemState" in the SharedItemStateManager as a hot spot in our application. To avoid the contention in "getNonVirtualItemState", we have pulled the isCached call out of the synchronized block and re-implemented the MLRUItemStateCache. It uses a HashMap that contains the ItemId-ItemState mapping and a ReadWriteLock to replace all synchronized blocks in the code. The implementation of "shrinkIfRequired" unfortunatly got much more expensive as the entryset of the HashMap must be sorted by accesscount. This method then clearly is a bottleneck. We solved this by changing the CacheManager a bit: the "resizeAll" method avoids the eviction of items out of caches as long as possible. These changes work out really well for our application. I have attached the changed files; comments/feedback are very welcome! Regards, Martijn Hendriks <GX> creative online development B.V. t: 024 - 3888 261 f: 024 - 3888 621 e: [EMAIL PROTECTED] Wijchenseweg 111 6538 SW Nijmegen http://www.gx.nl/ -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.