Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * 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 {
    /**
     * Atomically subtracts a value from the requested amount unless it's at Long.MAX_VALUE.
     * @param requested the requested amount holder
     * @param n the value to subtract from the requested amount, has to be positive (not verified)
     * @return the new requested amount
     * @throws IllegalStateException if n is greater than the current requested amount, which
     * indicates a bug in the request accounting logic
     */
    public static long produced(AtomicLong requested, long n) {
        for (;;) {
            long current = requested.get();
            if (current == Long.MAX_VALUE) {
                return Long.MAX_VALUE;
            }
            long next = current - n;
            if (next < 0L) {
                throw new IllegalStateException("More produced than requested: " + next);
            }
            if (requested.compareAndSet(current, next)) {
                return next;
            }
        }
    }
}