try Decrement AtomicInteger And Get If Greater Than - Java java.util.concurrent.atomic

Java examples for java.util.concurrent.atomic:AtomicInteger

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Description

try Decrement AtomicInteger And Get If Greater Than

Demo Code

/*//from   w w  w . j  av a 2s  .c  o  m
 * @(#)$Id: codetemplate_xbird.xml 943 2006-09-13 07:03:37Z yui $
 *
 * Copyright 2006-2008 Makoto YUI
 *
 * 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.
 * 
 * Contributors:
 *     Makoto YUI - initial implementation
 */
//package com.java2s;
import java.util.concurrent.atomic.AtomicInteger;

public class Main {
    public static int tryDecrementAndGetIfGreaterThan(
            final AtomicInteger capacity, final int least) {
        for (;;) {
            final int current = capacity.get();
            if (current <= least) {
                return current;
            }
            final int next = current - 1;
            if (capacity.compareAndSet(current, next)) {
                return next;
            }
        }
    }
}

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