StampedLockExample2

package com.thread.utils.statmp;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.StampedLock;
import java.util.stream.Collectors;
public class StampedLockExample2 {
    //private final static ReentrantLock lock = new ReentrantLock();
    private final static StampedLock lock = new StampedLock();
    private final static List<Long> data = new ArrayList<>();

    public static void main(String[] args) {
        ExecutorService service = Executors.newFixedThreadPool(10);
        Runnable readTask = () -> {
            for (; ; ) {
                read();
            }
        };
        Runnable writeTask = () -> {
            for (; ; ) {
                writer();
            }
        };

        for (int i = 0; i < 9; i++) {
            service.submit(readTask);
        }

        service.submit(writeTask);
    }

    private static void read() {
        long stamped = lock.tryOptimisticRead();
        System.err.println(stamped);
        if (lock.validate(stamped)) {
            try {
                stamped = lock.readLock();
                Optional.of(data.stream().map(String::valueOf).collect(Collectors.joining("#", "readlock=>[", "]")))
                        .ifPresent(System.out::println);
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            } finally {
                lock.unlockRead(stamped);
            }
        }
    }

    private static void writer() {
        long stamped = -1;
        try {
            stamped = lock.writeLock();
            data.add(System.currentTimeMillis());
            TimeUnit.SECONDS.sleep(1);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            lock.unlockWrite(stamped);
        }
    }
}