[Collection] Moving tx map wrappers into Collection Component?

[Oliver Zeigermann]

I was wondering if you collection people would like to have the 
transactional map wrappers I have developed in the transaction component 
moved into the collection component. They might be a good supplement and 
get more attention this way.

Those wrappers work fine and each has some basic JUnit test. The wrappes 
include
- a basic version doing "read committed" isolation that never blocks and 
never fails upon commit
- an extended version allowing for "serializable" isolation using 
pessimistic locks; the drawback is this wrapper might deadlock
- and extended verion allowing for "serializable" isolation using an 
optimictic strategy; the drawback is this wrapper might fail upon commit 
when conflicts occur

All wrappers take any kind of map to be wrapped. In case you use LRUMap 
or anything similar you can even implement a transactional cache with it.

What do you folks say?
Cheers,
Oliver
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