2024
https://habr.com/ru/companies/simbirsoft/articles/812097/
2023
https://xalgord.in/multi-threaded-programming-in-java/
    ExecutorService executor = Executors.newFixedThreadPool(10);
    CompletionService<String> completionService = new ExecutorCompletionService<>(executor);
2022
https://blogs.oracle.com/javamagazine/post/java-thread-synchronization-raceconditions-locks-conditions
    https://habr.com/ru/companies/otus/articles/755316/
2021
https://dzone.com/refcardz/core-java-concurrency
    volatile solves the problem of visibility, and makes changes the value to be atomic,
    because there is a happens-before relationship:
    write to a volatile variable happens before any subsequent read from the volatile variable. 
2019
https://habr.com/ru/company/yandex/blog/477074/
2018
https://dzone.com/articles/java-patterns-for-concurrency
2015
https://javarevisited.blogspot.com/2015/05/top-10-java-multithreading-and.html
2012
https://www.java67.com/2012/08/difference-between-countdownlatch-and-cyclicbarrier-java.html
2007
http://jeremymanson.blogspot.com/2007/08/atomicity-visibility-and-ordering.html
    Conceptually, all actions on volatiles happen in a single order, where each read sees the last write in that order.