Java AtomicInteger generateUniqueId()

Description

Generate unique id int.

License

Apache License

Return

the int

Declaration

public static int generateUniqueId() 

Method Source Code

//package com.java2s;
/*/*from ww  w .  ja v  a  2 s . c om*/
 * Copyright (c) 2016 Martin Pfeffer
 *
 * 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.AtomicInteger;

public class Main {
    private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1);

    /**
     * Generate unique id int.
     *
     * @return the int
     */
    public static int generateUniqueId() {
        for (;;) {
            final int result = sNextGeneratedId.get();
            int newValue = result + 1;
            if (newValue > 0x00FFFFFF)
                newValue = 1;
            if (sNextGeneratedId.compareAndSet(result, newValue)) {
                return result;
            }
        }
    }
}

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