double x = rnd(), y = rnd();
// circle search
c = new Circle( x, y, RADIUS);
// box search
b = new Box( new Point(x - HALF_BOX_WIDTH, y - HALF_BOX_WIDTH), new Point(x + HALF_BOX_WIDTH, y + HALF_BOX_WIDTH) );
// perform circle query
singleRun = System.currentTimeMillis();
result = repo.findByPositionWithin(c);
singleRun = System.currentTimeMillis() - singleRun;