[Improvement][server] Fix some sonar analyzed bugs (#3415)
* [FIX_BUG][*]fix sonar bugs fix assert error(assertions always pass) * fix assert error(assertions always pass) insert data should judging the success status * fix assert error(assertions always pass) * use AtomicReference<Object> to replace unsafe volatile Object * use AtomicReference<Object> to replace unsafe volatile Object * lazy initialization holder class Singleton... * reformat code judge database operations * reformat code judge database operations * revert * use ThreadLocalRandom to build random numbers * reform code * fix dao test error * judge database operations
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