RedisCache存入redis的数据key为何name和id的分隔符是两个冒号::

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Redis Cache缓存数据生成的key是由两部分组成，cacheNames和+d或者自定义生成方案，如果采用cacheNames+id方案则会在中间添加两个冒号::,这样使用工具查看的时候感觉怪怪的，今天我们就探讨下具体生成原因。

一、CacheKeyPrefix钩子回调接口

@FunctionalInterface
public interface CacheKeyPrefix {String SEPARATOR = "::";String compute(String cacheName);static CacheKeyPrefix simple() {return name -> name + SEPARATOR;}static CacheKeyPrefix prefixed(String prefix) {Assert.notNull(prefix, "Prefix must not be null");return name -> prefix + name + SEPARATOR;}
}

回调函数定义了simple()和prefixed()两个方法将定义的name和双冒号拼接

二、具体使用代码RedisCacheConfiguration#prefixCacheNameWith

	/*** Prefix the {@link RedisCache#getName() cache name} with the given value. <br />* The generated cache key will be: {@code prefix + cache name + "::" + cache entry key}.** @param prefix the prefix to prepend to the cache name.* @return new {@link RedisCacheConfiguration}.* @see #computePrefixWith(CacheKeyPrefix)* @see CacheKeyPrefix#prefixed(String)* @since 2.3*/public RedisCacheConfiguration prefixCacheNameWith(String prefix) {return computePrefixWith(CacheKeyPrefix.prefixed(prefix));}

注解标记拼接方案是：prefix + cache name + “::” + cache entry key

三、配置类RedisCacheConfiguration#createConfiguration调用上述方法

	private org.springframework.data.redis.cache.RedisCacheConfiguration createConfiguration(CacheProperties cacheProperties, ClassLoader classLoader) {Redis redisProperties = cacheProperties.getRedis();org.springframework.data.redis.cache.RedisCacheConfiguration config = org.springframework.data.redis.cache.RedisCacheConfiguration.defaultCacheConfig();config = config.serializeValuesWith(SerializationPair.fromSerializer(new JdkSerializationRedisSerializer(classLoader)));if (redisProperties.getTimeToLive() != null) {config = config.entryTtl(redisProperties.getTimeToLive());}if (redisProperties.getKeyPrefix() != null) {// 配置cacheName组合方案config = config.prefixCacheNameWith(redisProperties.getKeyPrefix());}if (!redisProperties.isCacheNullValues()) {config = config.disableCachingNullValues();}if (!redisProperties.isUseKeyPrefix()) {config = config.disableKeyPrefix();}return config;}