package com.zy.common.utils;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.data.redis.core.RedisTemplate;
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import org.springframework.stereotype.Component;
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import org.springframework.util.CollectionUtils;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.TimeUnit;
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import java.util.regex.Pattern;
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/**
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* redisTemplate封装
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*
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*/
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@Slf4j
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@Component
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public class RedisUtil {
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private static final long LOCAL_NO_EXPIRE = Long.MAX_VALUE;
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/** 无 TTL 写入 Redis 失败时,内存条目默认保留时长(秒) */
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private static final long LOCAL_DEFAULT_TTL_SEC = 86400L;
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// @Autowired
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// private RedisTemplate<String, Object> redisTemplate;
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@Autowired
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private RedisTemplate redisTemplate;
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private final ConcurrentHashMap<String, LocalCacheEntry> localCache = new ConcurrentHashMap<>();
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private final Object fallbackLock = new Object();
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private volatile boolean redisFallbackMode = false;
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private final Set<String> fallbackLocalKeys = ConcurrentHashMap.newKeySet();
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public RedisTemplate getRedisTemplate() {
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return redisTemplate;
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}
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public RedisUtil(RedisTemplate redisTemplate) {
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this.redisTemplate = redisTemplate;
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}
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/**
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* 指定缓存失效时间
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*
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* @param key 键
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* @param time 时间(秒)
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* @return
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*/
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public boolean expire(String key, long time) {
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try {
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if (time > 0) {
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redisTemplate.expire(key, time, TimeUnit.SECONDS);
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}
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 根据key 获取过期时间
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*
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* @param key 键 不能为null
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* @return 时间(秒) 返回0代表为永久有效
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*/
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public long getExpire(String key) {
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return redisTemplate.getExpire(key, TimeUnit.SECONDS);
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}
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/**
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* 判断key是否存在
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*
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* @param key 键
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* @return true 存在 false不存在
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*/
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public boolean hasKey(String key) {
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try {
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return redisTemplate.hasKey(key);
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} catch (Exception e) {
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e.printStackTrace();
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return localHasValid(key);
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}
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}
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/**
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* 删除缓存
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*
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* @param key 可以传一个值 或多个
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*/
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@SuppressWarnings("unchecked")
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public void del(String... key) {
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if (key != null && key.length > 0) {
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try {
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if (key.length == 1) {
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redisTemplate.delete(key[0]);
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} else {
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redisTemplate.delete(CollectionUtils.arrayToList(key));
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}
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} catch (Exception e) {
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// Redis 不可用时仍清理本地条目
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}
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for (String k : key) {
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if (k != null) {
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localCache.remove(k);
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}
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}
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}
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}
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//============================ String =============================
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/**
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* 普通缓存获取
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*
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* @param key 键
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* @return 值
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*/
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public Object get(String key) {
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if (key == null) {
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return null;
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}
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try {
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Object v = redisTemplate.opsForValue().get(key);
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notifyRedisAvailable();
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return v;
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} catch (Exception e) {
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enterFallbackIfNeeded();
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log.info("Redis 不可用,从 JVM 内存读取 key={},原因: {}", key, e.getMessage());
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return localGet(key);
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}
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}
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/**
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* 获取全部数据
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* @return
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*/
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public HashMap<Object, Object> getRedis() {
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Set<String> keys = redisTemplate.keys("*");
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HashMap<Object, Object> map = new HashMap<>();
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for (String key : keys) {
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Object value = redisTemplate.opsForValue().get(key);
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map.put(key, value);
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}
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return map;//返回全部数据集合
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}
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/**
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* 普通缓存放入
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*
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* @param key 键
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* @param value 值
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* @return true成功 false失败
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*/
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public boolean set(String key, Object value) {
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try {
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redisTemplate.opsForValue().set(key, value);
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long start = System.currentTimeMillis();
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while (System.currentTimeMillis() - start < 10000) {//有效期10s
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Object o = redisTemplate.opsForValue().get(key);
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if (o == null) {
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continue;
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}
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if (o.equals(value)) {
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break;
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}
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}
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localCache.remove(key);
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notifyRedisAvailable();
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return true;
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} catch (Exception e) {
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log.debug("Redis set 失败", e);
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localPutFallback(key, value, LOCAL_DEFAULT_TTL_SEC);
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return true;
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}
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}
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/**
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* 普通缓存放入-异步
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*
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* @param key 键
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* @param value 值
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* @return true成功 false失败
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*/
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public boolean setAsync(String key, Object value) {
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try {
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redisTemplate.opsForValue().set(key, value);
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localCache.remove(key);
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notifyRedisAvailable();
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return true;
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} catch (Exception e) {
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log.debug("Redis setAsync 失败", e);
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localPutFallback(key, value, LOCAL_DEFAULT_TTL_SEC);
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return true;
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}
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}
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/**
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* 普通缓存放入并设置时间
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*
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* @param key 键
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* @param value 值
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* @param time 时间(秒) time要大于0 如果time小于等于0 将设置无限期
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* @return true成功 false 失败
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*/
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public boolean set(String key, Object value, long time) {
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try {
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if (time > 0) {
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redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
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} else {
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set(key, value);
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return true;
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}
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localCache.remove(key);
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notifyRedisAvailable();
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return true;
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} catch (Exception e) {
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log.debug("Redis set(expire) 失败", e);
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long ttl = time > 0 ? time : LOCAL_DEFAULT_TTL_SEC;
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localPutFallback(key, value, ttl);
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return true;
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}
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}
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/**
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* 递增
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*
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* @param key 键
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* @param delta 要增加几(大于0)
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* @return
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*/
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public long incr(String key, long delta) {
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if (delta < 0) {
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throw new RuntimeException("递增因子必须大于0");
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}
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return redisTemplate.opsForValue().increment(key, delta);
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}
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/**
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* 递减
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*
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* @param key 键
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* @param delta 要减少几(小于0)
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* @return
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*/
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public long decr(String key, long delta) {
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if (delta < 0) {
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throw new RuntimeException("递减因子必须大于0");
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}
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return redisTemplate.opsForValue().increment(key, -delta);
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}
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//================================ Hash =================================
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/**
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* HashGet
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*
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* @param key 键 不能为null
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* @param item 项 不能为null
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* @return 值
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*/
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public Object hget(String key, String item) {
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return redisTemplate.opsForHash().get(key, item);
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}
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/**
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* 获取hashKey对应的所有键值
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*
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* @param key 键
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* @return 对应的多个键值
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*/
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public Map<Object, Object> hmget(String key) {
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return redisTemplate.opsForHash().entries(key);
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}
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/**
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* HashSet
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*
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* @param key 键
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* @param map 对应多个键值
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* @return true 成功 false 失败
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*/
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public boolean hmset(String key, Map<String, Object> map) {
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try {
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redisTemplate.opsForHash().putAll(key, map);
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* HashSet 并设置时间
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*
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* @param key 键
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* @param map 对应多个键值
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* @param time 时间(秒)
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* @return true成功 false失败
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*/
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public boolean hmset(String key, Map<String, Object> map, long time) {
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try {
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redisTemplate.opsForHash().putAll(key, map);
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if (time > 0) {
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expire(key, time);
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}
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 向一张hash表中放入数据,如果不存在将创建
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*
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* @param key 键
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* @param item 项
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* @param value 值
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* @return true 成功 false失败
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*/
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public boolean hset(String key, String item, Object value) {
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try {
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redisTemplate.opsForHash().put(key, item, value);
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 向一张hash表中放入数据,如果不存在将创建
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*
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* @param key 键
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* @param item 项
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* @param value 值
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* @param time 时间(秒) 注意:如果已存在的hash表有时间,这里将会替换原有的时间
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* @return true 成功 false失败
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*/
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public boolean hset(String key, String item, Object value, long time) {
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try {
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redisTemplate.opsForHash().put(key, item, value);
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if (time > 0) {
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expire(key, time);
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}
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 删除hash表中的值
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*
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* @param key 键 不能为null
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* @param item 项 可以使多个 不能为null
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*/
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public void hdel(String key, Object... item) {
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redisTemplate.opsForHash().delete(key, item);
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}
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/**
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* 判断hash表中是否有该项的值
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*
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* @param key 键 不能为null
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* @param item 项 不能为null
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* @return true 存在 false不存在
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*/
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public boolean hHasKey(String key, String item) {
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return redisTemplate.opsForHash().hasKey(key, item);
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}
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/**
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* hash递增 如果不存在,就会创建一个 并把新增后的值返回
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*
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* @param key 键
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* @param item 项
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* @param by 要增加几(大于0)
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* @return
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*/
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public double hincr(String key, String item, double by) {
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return redisTemplate.opsForHash().increment(key, item, by);
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}
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/**
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* hash递减
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*
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* @param key 键
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* @param item 项
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* @param by 要减少记(小于0)
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* @return
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*/
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public double hdecr(String key, String item, double by) {
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return redisTemplate.opsForHash().increment(key, item, -by);
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}
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//============================ set =============================
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/**
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* 根据key获取Set中的所有值
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*
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* @param key 键
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* @return
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*/
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public Set<Object> sGet(String key) {
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try {
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return redisTemplate.opsForSet().members(key);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* 根据value从一个set中查询,是否存在
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*
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* @param key 键
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* @param value 值
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* @return true 存在 false不存在
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*/
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public boolean sHasKey(String key, Object value) {
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try {
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return redisTemplate.opsForSet().isMember(key, value);
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 将数据放入set缓存
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*
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* @param key 键
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* @param values 值 可以是多个
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* @return 成功个数
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*/
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public long sSet(String key, Object... values) {
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try {
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return redisTemplate.opsForSet().add(key, values);
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} catch (Exception e) {
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e.printStackTrace();
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return 0;
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}
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}
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/**
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* 将set数据放入缓存
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*
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* @param key 键
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* @param time 时间(秒)
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* @param values 值 可以是多个
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* @return 成功个数
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*/
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public long sSetAndTime(String key, long time, Object... values) {
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try {
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Long count = redisTemplate.opsForSet().add(key, values);
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if (time > 0) {
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expire(key, time);
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}
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return count;
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} catch (Exception e) {
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e.printStackTrace();
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return 0;
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}
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}
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/**
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* 获取set缓存的长度
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*
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* @param key 键
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* @return
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*/
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public long sGetSetSize(String key) {
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try {
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return redisTemplate.opsForSet().size(key);
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} catch (Exception e) {
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e.printStackTrace();
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return 0;
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}
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}
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/**
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* 移除值为value的
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*
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* @param key 键
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* @param values 值 可以是多个
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* @return 移除的个数
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*/
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public long setRemove(String key, Object... values) {
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try {
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Long count = redisTemplate.opsForSet().remove(key, values);
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return count;
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} catch (Exception e) {
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e.printStackTrace();
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return 0;
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}
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}
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//===============================list=================================
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/**
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* 获取list缓存的内容
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*
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* @param key 键
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* @param start 开始
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* @param end 结束 0 到 -1代表所有值
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* @return
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*/
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public List<Object> lGet(String key, long start, long end) {
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try {
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return redisTemplate.opsForList().range(key, start, end);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* 获取list缓存的长度
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*
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* @param key 键
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* @return
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*/
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public long lGetListSize(String key) {
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try {
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return redisTemplate.opsForList().size(key);
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} catch (Exception e) {
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e.printStackTrace();
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return 0;
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}
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}
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/**
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* 通过索引 获取list中的值
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*
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* @param key 键
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* @param index 索引 index>=0时, 0 表头,1 第二个元素,依次类推;index<0时,-1,表尾,-2倒数第二个元素,依次类推
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* @return
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*/
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public Object lGetIndex(String key, long index) {
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try {
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return redisTemplate.opsForList().index(key, index);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* 将list放入缓存
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*
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* @param key 键
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* @param value 值
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* @return
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*/
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public boolean lSet(String key, Object value) {
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try {
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redisTemplate.opsForList().rightPush(key, value);
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 将list放入缓存
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*
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* @param key 键
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* @param value 值
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* @param time 时间(秒)
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* @return
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*/
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public boolean lSet(String key, Object value, long time) {
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try {
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redisTemplate.opsForList().rightPush(key, value);
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if (time > 0) {
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expire(key, time);
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}
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 将list放入缓存
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*
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* @param key 键
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* @param value 值
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* @return
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*/
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public boolean lSet(String key, List<Object> value) {
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try {
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redisTemplate.opsForList().rightPushAll(key, value);
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 将list放入缓存
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*
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* @param key 键
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* @param value 值
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* @param time 时间(秒)
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* @return
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*/
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public boolean lSet(String key, List<Object> value, long time) {
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try {
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redisTemplate.opsForList().rightPushAll(key, value);
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if (time > 0) {
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expire(key, time);
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}
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 根据索引修改list中的某条数据
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*
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* @param key 键
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* @param index 索引
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* @param value 值
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* @return
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*/
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public boolean lUpdateIndex(String key, long index, Object value) {
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try {
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redisTemplate.opsForList().set(key, index, value);
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return true;
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} catch (Exception e) {
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e.printStackTrace();
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return false;
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}
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}
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/**
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* 移除N个值为value
|
*
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* @param key 键
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* @param count 移除多少个
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* @param value 值
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* @return 移除的个数
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*/
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public long lRemove(String key, long count, Object value) {
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try {
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Long remove = redisTemplate.opsForList().remove(key, count, value);
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return remove;
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} catch (Exception e) {
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e.printStackTrace();
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return 0;
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}
|
}
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/**
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* 模糊查询获取key值
|
*
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* @param pattern
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* @return
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*/
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public Set keys(String pattern) {
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try {
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Set<?> s = redisTemplate.keys(pattern);
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notifyRedisAvailable();
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return s;
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} catch (Exception e) {
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enterFallbackIfNeeded();
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log.info("Redis 不可用,从 JVM 内存匹配 keys,pattern={},原因: {}", pattern, e.getMessage());
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return localKeysMatching(pattern);
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}
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}
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/**
|
* 使用Redis的消息队列
|
*
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* @param channel
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* @param message 消息内容
|
*/
|
public void convertAndSend(String channel, Object message) {
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redisTemplate.convertAndSend(channel, message);
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}
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private void enterFallbackIfNeeded() {
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synchronized (fallbackLock) {
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if (!redisFallbackMode) {
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redisFallbackMode = true;
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log.warn("Redis 不可用,字符串相关缓存将暂存于 JVM 内存,待 Redis 恢复后自动切回 Redis 并清理上述键");
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}
|
}
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}
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private void notifyRedisAvailable() {
|
if (!redisFallbackMode && fallbackLocalKeys.isEmpty()) {
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return;
|
}
|
synchronized (fallbackLock) {
|
if (!redisFallbackMode && fallbackLocalKeys.isEmpty()) {
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return;
|
}
|
int n = fallbackLocalKeys.size();
|
for (String k : new ArrayList<>(fallbackLocalKeys)) {
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localCache.remove(k);
|
}
|
fallbackLocalKeys.clear();
|
redisFallbackMode = false;
|
if (n > 0) {
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log.info("Redis 已恢复,已清理 JVM 内存中 {} 个因 Redis 不可用而暂存的键", n);
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} else {
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log.info("Redis 已恢复");
|
}
|
}
|
}
|
|
private void localPutFallback(String key, Object value, long ttlSeconds) {
|
if (key == null) {
|
return;
|
}
|
synchronized (fallbackLock) {
|
if (!redisFallbackMode) {
|
redisFallbackMode = true;
|
log.warn("Redis 不可用,字符串相关缓存将暂存于 JVM 内存,待 Redis 恢复后自动切回 Redis 并清理上述键");
|
}
|
fallbackLocalKeys.add(key);
|
localPut(key, value, ttlSeconds);
|
}
|
log.info("Redis 不可用,键已写入 JVM 内存: {}", key);
|
}
|
|
private void localPut(String key, Object value, long ttlSeconds) {
|
if (key == null) {
|
return;
|
}
|
long expireAt = ttlSeconds > 0
|
? System.currentTimeMillis() + TimeUnit.SECONDS.toMillis(ttlSeconds)
|
: LOCAL_NO_EXPIRE;
|
localCache.put(key, new LocalCacheEntry(value, expireAt));
|
}
|
|
private Object localGet(String key) {
|
LocalCacheEntry e = localCache.get(key);
|
if (e == null) {
|
return null;
|
}
|
if (e.expireAtMillis != LOCAL_NO_EXPIRE && System.currentTimeMillis() > e.expireAtMillis) {
|
localCache.remove(key, e);
|
return null;
|
}
|
return e.value;
|
}
|
|
private boolean localHasValid(String key) {
|
return localGet(key) != null;
|
}
|
|
private Set<String> localKeysMatching(String pattern) {
|
if (pattern == null) {
|
return new HashSet<>();
|
}
|
Pattern p = Pattern.compile(globToRegex(pattern));
|
Set<String> out = new HashSet<>();
|
for (String k : localCache.keySet()) {
|
if (localGet(k) == null) {
|
continue;
|
}
|
if (p.matcher(k).matches()) {
|
out.add(k);
|
}
|
}
|
return out;
|
}
|
|
private static String globToRegex(String glob) {
|
StringBuilder sb = new StringBuilder("^");
|
for (int i = 0; i < glob.length(); i++) {
|
char c = glob.charAt(i);
|
if (c == '*') {
|
sb.append(".*");
|
} else if (c == '?') {
|
sb.append('.');
|
} else if ("\\.[]{}()+-^$|".indexOf(c) >= 0) {
|
sb.append('\\').append(c);
|
} else {
|
sb.append(c);
|
}
|
}
|
sb.append('$');
|
return sb.toString();
|
}
|
|
private static final class LocalCacheEntry {
|
final Object value;
|
final long expireAtMillis;
|
|
LocalCacheEntry(Object value, long expireAtMillis) {
|
this.value = value;
|
this.expireAtMillis = expireAtMillis;
|
}
|
}
|
|
}
|