java-concurrent-programming/src/main/java/ch6/s6/Point.java at master · ZaleKB/java-concurrent-programming · GitHub

33 lines (29 loc) · 807 Bytes

package ch6.s6;

import java.util.concurrent.locks.StampedLock;

public class Point {

private double x,y;

private final StampedLock s1 = new StampedLock();

void move(double deltaX, double deltaY){

long stamp = s1.writeLock();

try{

x += deltaX;

y += deltaY;

} finally {

s1.unlockWrite(stamp);

}

double distanceFromOrigin(){

long stamp = s1.tryOptimisticRead();

double currentX = x, currentY = y;

if(!s1.validate(stamp)){

stamp = s1.readLock();

try{

currentX = x;

currentY = y;

} finally {

s1.unlockRead(stamp);

}

return Math.sqrt(currentX*currentX + currentY*currentY);

}

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