001/**
002 * Copyright (c) 2015-2022, Michael Yang 杨福海 (fuhai999@gmail.com).
003 * <p>
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 * <p>
008 * http://www.apache.org/licenses/LICENSE-2.0
009 * <p>
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package io.jboot.objects.counter.impl;
017
018import io.jboot.objects.counter.JbootCounter;
019
020import java.util.HashMap;
021import java.util.Map;
022import java.util.concurrent.atomic.AtomicLong;
023
024/**
025 * @author michael yang (fuhai999@gmail.com)
026 * @Date: 2020/3/7
027 */
028public class JbootLocalCounter implements JbootCounter {
029
030    private static Map<String, AtomicLong> ATOMICLONGS = new HashMap<>();
031
032    private AtomicLong atomicLong;
033
034    public JbootLocalCounter(String name) {
035        atomicLong = ATOMICLONGS.get(name);
036        if (atomicLong == null) {
037            synchronized (JbootLocalCounter.class) {
038                atomicLong = ATOMICLONGS.get(name);
039                if (atomicLong == null) {
040                    atomicLong = new AtomicLong();
041                    ATOMICLONGS.put(name, atomicLong);
042                }
043            }
044        }
045    }
046
047    @Override
048    public Long increment() {
049        return atomicLong.incrementAndGet();
050    }
051
052    @Override
053    public Long decrement() {
054        return atomicLong.decrementAndGet();
055    }
056
057    @Override
058    public Long get() {
059        return atomicLong.get();
060    }
061
062    @Override
063    public void set(long newValue) {
064        atomicLong.set(newValue);
065    }
066}