SmartKeyRWLocker
Combining globalRWLocker and internal map of SmartRWLocker associated by T to provide next logic:
Locker by key, for reading: waiting for globalRWLocker unlock write by acquiring read permit in it and then taking or creating locker for key T and lock its reading too
Locker by key, for writing: waiting for globalRWLocker unlock write by acquiring read permit in it and then taking or creating locker for key T and lock its writing
globalRWLocker, for reading: using SmartRWLocker.acquireRead, will be suspended until its SmartRWLocker.lockWrite will not be unlocked
globalRWLocker, for writing: using SmartRWLocker.lockWrite, will be paused by other reading and writing operations and will pause other operations until the end of operation (calling of unlockWrite)
You may see, that lockers by key still will use global locker permits - it is required to prevent globalRWLocker write locking during all other operations are not done. In fact, all the keys works like a simple SmartRWLocker as well, as globalRWLocker, but they are linked with globalRWLocker permissions