2023
https://questdb.io/blog/concurrent-lockfree-datastructure-design-walkthrough/

https://stackoverflow.com/questions/6965731/are-locks-autocloseable

https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/concurrent/locks/ReentrantLock.html
    ... like synchronized methods and statements, but with extended capabilities. 
    if (!tryLock())
        throw ...