import java.util.concurrent.ExecutorService
import java.util.concurrent.Executors
import java.util.concurrent.atomic.LongAccumulator
import java.util.function.LongBinaryOperator
import java.util.stream.IntStream
public class LongAccumulator {
public static void main(String[] args) {
testAccumulate()
}
private static void testAccumulate() {
LongBinaryOperator op = (x, y) -> 2 * x + y
LongAccumulator accumulator = new LongAccumulator(op, 1L)
ExecutorService executor = Executors.newFixedThreadPool(2)
IntStream.range(0, 10)
.forEach(i -> executor.submit(() -> accumulator.accumulate(i)))
ConcurrentUtils.stop(executor)
System.out.format("Add: %d\n", accumulator.getThenReset())
}
}