Github user BrynCooke commented on the issue:
https://github.com/apache/tinkerpop/pull/567
1. ManagedConcurrentValueMap is not a map. I don't really know why we use
this. but computeIfAbsent is not present on this class.
2. Guava LoadingCache and MoreExecutors.directExecutor() is the correct way
of solving this problem. It allows soft values and does all the syncronisation
stuff for us. Is there a reason why guava is not used by Tinkerpop?
If we want avoid guava we need to have a striped lock on script, and to
create our own direct executor.
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