Tomasz Posluszny 6528ecc800 Add event listeners to RocksJava (#7425) ... Summary: Allows adding event listeners in RocksJava. * Adds listeners getter and setter in `Options` and `DBOptions` classes. * Adds `EventListener` Java interface and base class for implementing custom event listener callbacks - `AbstractEventListener`, which has an underlying native callback class implementing C++ `EventListener` class. * `AbstractEventListener` class has mechanism for selectively enabling its callback methods in order to prevent invoking Java method if it is not implemented. This decreases performance cost in case only subset of event listener callback methods is needed - the JNI code for remaining "no-op" callbacks is not executed. * The code is covered by unit tests in `EventListenerTest.java`, there are also tests added for setting/getting listeners field in `OptionsTest.java` and `DBOptionsTest.java`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7425 Reviewed By: pdillinger Differential Revision: D24063390 Pulled By: jay-zhuang fbshipit-source-id: 508c359538983d6b765e70d9989c351794a944ee		2020-10-14 11:33:52 -07:00
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main/java/org/rocksdb	Add event listeners to RocksJava (#7425)	2020-10-14 11:33:52 -07:00
test/java/org/rocksdb	Add event listeners to RocksJava (#7425)	2020-10-14 11:33:52 -07:00