Decouple session from connection #215
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So it could later use it to obtain connections on demand rather than hold a single connection permanently.
This commit effectively decouples session from connection. Session now holds two `ConnectionHolder`s that lazily pick connection from the pool when it is needed and try to release connection back to the pool when it does not have any users. Session keeps one connection holder for read connection and one for write connection. Connection is acquired for `Session#run()` and released when the returned result is either fully consumed or error happens. Also connection is acquired for `Session#beginTransaction()` and released when transaction commits or rolls back.
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lgtm! |
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