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87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
#pragma once
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#include "acl_cpp/acl_cpp_define.hpp"
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#include <vector>
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#include "acl_cpp/stdlib/string.hpp"
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#include "acl_cpp/redis/redis_command.hpp"
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namespace acl
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{
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class redis_client;
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class redis_client_cluster;
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class ACL_CPP_API redis_hyperloglog : virtual public redis_command
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{
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public:
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/**
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* see redis_command::redis_command()
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*/
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redis_hyperloglog(void);
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/**
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* see redis_command::redis_command(redis_client*)
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*/
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redis_hyperloglog(redis_client* conn);
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/**
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* see redis_command::redis_command(redis_client_cluster*, size_t)
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*/
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redis_hyperloglog(redis_client_cluster* cluster, size_t max_conns = 0);
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virtual ~redis_hyperloglog(void);
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/**
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* 将任意数量的元素添加到指定的 HyperLogLog 里面
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* add the specified elements to the specified HyperLogLog
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* @param key {const char*} 指定 key 值
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* the key
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* @param first_element {const char*} 元素集合的第一个元素值，非空字符串
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* the first element of the elements list, and the last must be NULL
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* in the elements list
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* @return {int} 操作是否成功，同时表明是否发生了变更，返回值含义如下：
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* return the follow values:
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* 1：操作成功，且数据发生了变更（新增数据或老数据发生变更）
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* successful, and the data was varied
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* 0：修改老数据未发生变化
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* nothing was changed after modifying the old data
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* -1：出错或对应的 key 对象非 hyperloglog 对象
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* error or the keh isn't a hyperloglog type
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*/
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int pfadd(const char* key, const char* first_element, ...);
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int pfadd(const char* key, const std::vector<const char*>& elements);
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int pfadd(const char* key, const std::vector<string>& elements);
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/**
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* 获得给定键列表的 HyperLoglog 去重后元素的近似数量
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* return the approximated cardinality of the set(s) observed by
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* the hyperloglog at key(s)
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* @param first_key {const char*} key 集合的第一个 key，非空字符串
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* the firs key which must not be NULL of the keys list, and the
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* last parameter must be NULL in keys' list
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* @return {int} 键列表集合中经去重后元素的近似数量
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*/
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int pfcount(const char* first_key, ...);
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int pfcount(const std::vector<const char*>& keys);
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int pfcount(const std::vector<string>& keys);
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/**
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* 将多个 HyperLogLog 合并（merge）为一个 HyperLogLog ， 合并后的
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* HyperLogLog 的基数接近于所有输入 HyperLogLog 的可见集合的并集
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* merge multiple different hyperloglogs into a single one
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* @param dst {const char*} 目标存储 HyperLogLog 对象的键值
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* the single key as the destination
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* @param first_src {const char*} 源对象集合中第一个源 HyperLogLog 对象的键
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* the first source key which must not be NULL in the sources list,
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* and the last one must be NULL showing the end of the list
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* @return {bool} 操作是否成功，返回 false 表明出错或目标/源对象非
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* HyperLogLog 对象
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* true on success, false if the error or the dest/src are not
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* hyperloglog
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*/
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bool pfmerge(const char* dst, const char* first_src, ...);
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bool pfmerge(const char* dst, const std::vector<const char*>& keys);
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bool pfmerge(const char* dst, const std::vector<string>& keys);
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};
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} // namespace acl
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