Synchronization in a HashMap cache

Question

I\'ve got a web application where people ask for resources. This resources are cached using a synchronized hash map for efficiency. The problem here is when two different re

Answer 1

Your code looks ok, except that you are synchronizing more than actually required:

• Using a ConcurrentHashMap instead of a synchronized HashMap would allow multiple invocations of the get method without locking.

• Synchronizing on this instead of resources is probably not necessary, but it depends on the rest of your code.