com.github.yizzuide.milkomeda.moon.PercentMoonStrategy Maven / Gradle / Ivy

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/*
 * Copyright (c) 2021 yizzuide All rights Reserved.
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.github.yizzuide.milkomeda.moon;

import com.github.yizzuide.milkomeda.util.IOUtils;
import lombok.Data;
import lombok.EqualsAndHashCode;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;

import java.io.IOException;
import java.io.Serializable;
import java.util.Collections;
import java.util.List;

/**
 * PercentMoonStrategy
 * 百分比分配 

 *
 * 全部阶段总百分比为100，阶段赋值如下：

 * 33% 设置 33：阶段值为索引0
 * 67% 设置 67：阶段值为索引1
 *
 * @author yizzuide
 * @since 2.6.0
 * @version 3.12.10
 * 

 * Create at 2020/03/13 21:42
 */
@EqualsAndHashCode(callSuper = false)
@Data
public class PercentMoonStrategy extends AbstractMoonStrategy {
    /**
     * 分布式key前缀
     */
    private static final String PREFIX = "moon:percent-";
    /**
     * 默认总占百分（-1为自动根据百分比计算）
     */
    public static final int DEFAULT_PERCENT = -1;
    /**
     * 百分比
     */
    private int percent = DEFAULT_PERCENT;

    @Override
    public  T getCurrentPhase(Moon moon) {
        throw new UnsupportedOperationException("PercentMoonStrategy is not support run on standalone.");
    }

    @SuppressWarnings("all")
    @Override
    public  T getPhase(String key, Integer p, Moon prototype) {
        for (Integer i = 0; i < prototype.getLen(); i++) {
            T phaseName = prototype.getPhaseNames().get(i);
            if (!(phaseName instanceof Integer)) {
                throw new UnsupportedOperationException("Only support int data type.");
            }
            Integer phase = (Integer) phaseName;
            // 累计百分比，使各阶段分配相应百分比的值
            if (i != 0) {
                phase += (Integer) prototype.getPhaseNames().get(i - 1);
            }
            // 找到不满足百分比的阶段，返回阶段索引值
            if (p < phase) {
                return (T) Integer.valueOf(i);
            }
        }
        return null;
    }

    @Override
    protected int calcBounds(Moon moon) {
        fixPercent(moon);
        return percent;
    }

    @SuppressWarnings("unchecked")
    @Override
    public  T getPhaseFast(String key, Moon prototype) {
        //  自动计算百分总份
        fixPercent(prototype);
        RedisTemplate redisTemplate = getJsonRedisTemplate();
        RedisScript redisScript = new DefaultRedisScript<>(getLuaScript(), Long.class);
        List phaseNames = prototype.getPhaseNames();
        // map -> table
        /*Map phaseMap = new HashMap<>();
        for (int i = 0; i < phaseNames.size(); i++) {
            phaseMap.put("p" + (i + 1), (Integer)phaseNames.get(i));
        }
        Long phase = redisTemplate.execute(redisScript, Collections.singletonList(PREFIX + key), phaseMap, phaseMap.size(), percent);*/
        // list -> table
        Long phase = redisTemplate.execute(redisScript, Collections.singletonList(PREFIX + key), phaseNames, percent);
        assert phase != null;
        return (T) ((Integer) phase.intValue());
    }

    @Override
    public String loadLuaScript() throws IOException {
        return IOUtils.loadLua(IOUtils.LUA_PATH, "moon_percent.lua");
    }

    /**
     * 百分比表达式解析 

     *      * 百分总量为10时：5/5、3/7、1/5/4、0/10、10/0
     * 百分总量为100时：25/75、10/20/70、0/100、100/0
     * 
     * @param percentExpress    百分比表达式
     * @return 百分比列表
     */
    public static Integer[] parse(String percentExpress) {
        String[] percentComps = percentExpress.split("/");
        int len = percentComps.length;
        if (len < 2) {
            throw new IllegalArgumentException("Percent express format is illegal: " + percentExpress);
        }
        Integer[] percentArray = new Integer[len];
        for (int i = 0; i < len; i++) {
            percentArray[i] = Integer.valueOf(percentComps[i]);
        }
        return percentArray;
    }

    private  void fixPercent(Moon prototype) {
        if (percent == -1) {
            percent = prototype.getPhaseNames().stream().map(p -> (Integer) p).reduce(0, Integer::sum);
        }
    }
}