/src/main/java/com/jieyin/upload/utils/RedisUtils.java

/**
 * Copyright (c) 2016-2019 人人开源 All rights reserved.
 * <p>
 * https://www.renren.io
 * <p>
 * 版权所有，侵权必究！
 */

package com.jieyin.upload.utils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.RedisStringCommands;
import org.springframework.data.redis.connection.ReturnType;
import org.springframework.data.redis.core.*;
import org.springframework.data.redis.core.types.Expiration;
import org.springframework.stereotype.Component;

import java.io.Serializable;
import java.nio.charset.Charset;
import java.util.Date;
import java.util.List;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * Redis工具类
 *
 * @author Mark sunlightcs@gmail.com
 */
@Slf4j
@Component
public class RedisUtils {
    @Autowired
    private RedisTemplate redisTemplate;

    /**
     * 写入缓存
     *
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value) {
        boolean result = false;
        try {
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            operations.set(key, value);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 写入缓存设置当前时间
     *
     * @param key
     * @param value
     * @param nowTime
     * @return
     */
    public boolean set(final String key, Object value, Long nowTime) {
        boolean result = false;
        try {
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            operations.set(key, value);
            operations.set(key + "_setTime", String.valueOf(nowTime));
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 写入缓存设置当前时间
     *
     * @param key
     * @param value
     * @return
     */
    public boolean setNowData(final String key, Object value) {
        Long nowTime = new Date().getTime();
        return set(key, value, nowTime);
    }

    /**
     * 获取缓存
     *
     * @param key
     * @param expireTime
     * @return
     */
    public Object get(final String key, Long expireTime) {
        Object result = null;
        Object setTime;
        Long nowTime = new Date().getTime();
        ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
        setTime = operations.get(key + "_setTime");
        if (setTime != null && nowTime - Long.parseLong(setTime.toString()) < expireTime) {
            result = operations.get(key);
            log.info("从redis中取出的值为:{}",result.toString());
        }
        return result;
    }

    /**
     * 获取缓存（有效期限制）转对象
     *
     * @param key
     * @param expireTime
     * @param clazz
     * @param <T>
     * @return
     */
    public <T> T get(final String key, Long expireTime, Class<T> clazz) {
        Object object = get(key, expireTime);
        if (object == null) {
            return null;
        } else {
            JSONObject jsonObject = JSONObject.parseObject(object.toString());
            return JSON.toJavaObject(jsonObject, clazz);
        }
    }

    /**
     * 写入缓存设置时效时间
     *
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value, Long expireTime, TimeUnit timeUnit) {
        boolean result = false;
        try {
            ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
            operations.set(key, value);
            redisTemplate.expire(key, expireTime, timeUnit);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 批量删除对应的value
     *
     * @param keys
     */
    public void remove(final String... keys) {
        for (String key : keys) {
            remove(key);
        }
    }

    /**
     * 批量删除key
     *
     * @param pattern
     */
    public void removePattern(final String pattern) {
        Set<Serializable> keys = redisTemplate.keys(pattern);
        if (keys.size() > 0) {
            redisTemplate.delete(keys);
        }
    }

    /**
     * 删除对应的value
     *
     * @param key
     */
    public void remove(final String key) {
        if (exists(key)) {
            redisTemplate.delete(key);
        }
    }

    /**
     * 判断缓存中是否有对应的value
     *
     * @param key
     * @return
     */
    public boolean exists(final String key) {
        return redisTemplate.hasKey(key);
    }

    /**
     * 读取缓存
     *
     * @param key
     * @return
     */
    public Object get(final String key) {
        Object result = null;
        ValueOperations<Serializable, Object> operations = redisTemplate.opsForValue();
        result = operations.get(key);
        return result;
    }

    /**
     * 哈希 添加
     *
     * @param key
     * @param hashKey
     * @param value
     */
    public void hmSet(String key, Object hashKey, Object value) {
        HashOperations<String, Object, Object> hash = redisTemplate.opsForHash();
        hash.put(key, hashKey, value);
    }

    /**
     * 哈希获取数据
     *
     * @param key
     * @param hashKey
     * @return
     */
    public Object hmGet(String key, Object hashKey) {
        HashOperations<String, Object, Object> hash = redisTemplate.opsForHash();
        return hash.get(key, hashKey);
    }

    /**
     * 列表添加
     *
     * @param k
     * @param v
     */
    public void lPush(String k, Object v) {
        ListOperations<String, Object> list = redisTemplate.opsForList();
        list.rightPush(k, v);
    }

    /**
     * 列表获取
     *
     * @param k
     * @param l
     * @param l1
     * @return
     */
    public List<Object> lRange(String k, long l, long l1) {
        ListOperations<String, Object> list = redisTemplate.opsForList();
        return list.range(k, l, l1);
    }

    /**
     * 集合添加
     *
     * @param key
     * @param value
     */
    public void add(String key, Object value) {
        SetOperations<String, Object> set = redisTemplate.opsForSet();
        set.add(key, value);
    }

    /**
     * 集合获取
     *
     * @param key
     * @return
     */
    public Set<Object> setMembers(String key) {
        SetOperations<String, Object> set = redisTemplate.opsForSet();
        return set.members(key);
    }

    /**
     * 有序集合添加
     *
     * @param key
     * @param value
     * @param scoure
     */
    public void zAdd(String key, Object value, double scoure) {
        ZSetOperations<String, Object> zset = redisTemplate.opsForZSet();
        zset.add(key, value, scoure);
    }

    /**
     * 有序集合获取
     *
     * @param key
     * @param scoure
     * @param scoure1
     * @return
     */
    public Set<Object> rangeByScore(String key, double scoure, double scoure1) {
        ZSetOperations<String, Object> zset = redisTemplate.opsForZSet();
        return zset.rangeByScore(key, scoure, scoure1);
    }

    /**
     * 解锁脚本，原子操作
     */
    private static final String unlockScript =
            "if redis.call(\"get\",KEYS[1]) == ARGV[1]\n"
                    + "then\n"
                    + "    return redis.call(\"del\",KEYS[1])\n"
                    + "else\n"
                    + "    return 0\n"
                    + "end";

    /**
     * 加锁，有阻塞
     *
     * @param name
     * @param expire
     * @param timeout
     * @return
     */
    public String lock(String name, long expire, long timeout) {
        long startTime = System.currentTimeMillis();
        String token;
        do {
            token = tryLock(name, expire);
            if (token == null) {
                if ((System.currentTimeMillis() - startTime) > (timeout - 50))
                    break;
                try {
                    Thread.sleep(50); //try 50 per sec
                } catch (InterruptedException e) {
                    e.printStackTrace();
                    return null;
                }
            }
        } while (token == null);

        return token;
    }

    /**
     * 加锁，无阻塞
     *
     * @param name
     * @param expire
     * @return
     */
    public String tryLock(String name, long expire) {
        String token = UUID.randomUUID().toString();
        RedisConnectionFactory factory = redisTemplate.getConnectionFactory();
        RedisConnection conn = factory.getConnection();
        try {
            Boolean result = conn.set(name.getBytes(Charset.forName("UTF-8")), token.getBytes(Charset.forName("UTF-8")),
                    Expiration.from(expire, TimeUnit.MILLISECONDS), RedisStringCommands.SetOption.SET_IF_ABSENT);
            if (result != null && result)
                return token;
        } finally {
            RedisConnectionUtils.releaseConnection(conn, factory);
        }
        return null;
    }

    /**
     * 解锁
     *
     * @param name
     * @param token
     * @return
     */
    public boolean unlock(String name, String token) {
        byte[][] keysAndArgs = new byte[2][];
        keysAndArgs[0] = name.getBytes(Charset.forName("UTF-8"));
        keysAndArgs[1] = token.getBytes(Charset.forName("UTF-8"));
        RedisConnectionFactory factory = redisTemplate.getConnectionFactory();
        RedisConnection conn = factory.getConnection();
        try {
            Long result = conn.scriptingCommands().eval(unlockScript.getBytes(Charset.forName("UTF-8")), ReturnType.INTEGER, 1, keysAndArgs);
            if (result != null && result > 0)
                return true;
        } finally {
            RedisConnectionUtils.releaseConnection(conn, factory);
        }

        return false;
    }
}