package com.winterbe.java8.samples.concurrent;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.locks.StampedLock;
/**
* @author Benjamin Winterberg
*/
public class Lock4 {
public static void main(String[] args) {
ExecutorService executor = Executors.newFixedThreadPool(2);
Map<String, String> map = new HashMap<>();
StampedLock lock = new StampedLock();
executor.submit(() -> {
long stamp = lock.writeLock();
try {
ConcurrentUtils.sleep(1);
map.put("foo", "bar");
} finally {
lock.unlockWrite(stamp);
}
});
Runnable readTask = () -> {
long stamp = lock.readLock();
try {
System.out.println(map.get("foo"));
ConcurrentUtils.sleep(1);
} finally {
lock.unlockRead(stamp);
}
};
executor.submit(readTask);
executor.submit(readTask);
ConcurrentUtils.stop(executor);
}
}