import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
public class MyResource {
private ReadWriteLock lock = new ReentrantReadWriteLock();
private int value;
public int getValue() {
lock.readLock().lock();
try {
return value;
} finally {
lock.readLock().unlock();
}
}
public void setValue(int value) {
lock.writeLock().lock();
try {
this.value = value;
} finally {
lock.writeLock().unlock();
}
}
}
import java.util.concurrent.locks.StampedLock;
public class MyResource {
private StampedLock lock = new StampedLock();
private int value;
public int getValue() {
long stamp = lock.tryOptimisticRead();
int currentValue = value;
if (!lock.validate(stamp)) {
stamp = lock.readLock();
try {
currentValue = value;
} finally {
lock.unlockRead(stamp);
}
}
return currentValue;
}
public void setValue(int value) {
long stamp = lock.writeLock();
try {
this.value = value;
} finally {
lock.unlockWrite(stamp);
}
}
}
