Here you can find the source of getAndAddRequest(AtomicLong requested, long n)
| Parameter | Description |
|---|---|
| requested | atomic long that should be updated |
| n | the number of requests to add to the requested count, positive (not validated) |
public static long getAndAddRequest(AtomicLong requested, long n)
//package com.java2s; /**// w ww . j a va2s . com * Copyright 2015 Netflix, Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ import java.util.concurrent.atomic.*; public class Main { /** * Adds {@code n} (not validated) to {@code requested} and returns the value prior to addition once the * addition is successful (uses CAS semantics). If overflows then sets * {@code requested} field to {@code Long.MAX_VALUE}. * * @param requested * atomic long that should be updated * @param n * the number of requests to add to the requested count, positive (not validated) * @return requested value just prior to successful addition */ public static long getAndAddRequest(AtomicLong requested, long n) { // add n to field but check for overflow while (true) { long current = requested.get(); long next = addCap(current, n); if (requested.compareAndSet(current, next)) { return current; } } } /** * Adds two positive longs and caps the result at Long.MAX_VALUE. * @param a the first value * @param b the second value * @return the capped sum of a and b */ public static long addCap(long a, long b) { long u = a + b; if (u < 0L) { u = Long.MAX_VALUE; } return u; } }