[GROOVY-8437] Implement an atomic `getAndPut` method for `LRUCache`

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-2
• Assignee: Daniel Sun
• Reporter: Daniel Sun
• Created: 09/Jan/18 01:44
• Updated: 09/Jan/18 01:46
• Resolved: 09/Jan/18 01:46

Description

Currently LRUCache just provides basic cache function(i.e. get, put), which can not make sure same entry will not be added multi-times easily and effectively.

In order to resolve the above problem, ConcurrentLinkedHashMap is refined to support `computeIfAbsent`, which is key function for caches. In addition, LRUCache implements `getAndPut`, which is based on the `computeIfAbsent`.

Note: the improvement is only available in Groovy 3.0.0+