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/*
 * Copyright 1999-2018 Alibaba Group Holding Ltd.
 *
 * 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.
 */

package com.alibaba.nacos.config.server.utils;

import java.util.concurrent.atomic.AtomicLong;

/**
 * Accumulate Stat Count.
 *
 * @author Nacos
 */
public class AccumulateStatCount {
    
    final AtomicLong total = new AtomicLong(0);
    
    long lastStatValue = 0;
    
    public long increase() {
        return total.incrementAndGet();
    }
    
    /**
     * accumulate stat.
     *
     * @return stat.
     */
    public long stat() {
        long tmp = total.get() - lastStatValue;
        lastStatValue += tmp;
        return tmp;
    }
}