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200 lines
7.8 KiB
C++
200 lines
7.8 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 <map>
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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_result;
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class string;
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class ACL_CPP_API redis_pubsub : 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_pubsub();
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/**
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* see redis_command::redis_command(redis_client*)
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*/
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redis_pubsub(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_pubsub(redis_client_cluster* cluster, size_t max_conns);
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virtual ~redis_pubsub();
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/////////////////////////////////////////////////////////////////////
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/**
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* 将信息发送到指定的频道 channel
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* post a message to a channel
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* @param channel {const char*} 所发送消息的目标频道
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* the specified channel
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* @param msg {const char*} 消息内容
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* the message to be sent
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* @param len {size_t} 消息长度
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* the message's length
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* @return {int} 成功发送至订阅该频道的订阅者数量
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* the number of clients that received the message
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* -1：表示出错
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* error happened
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* 0：没有订阅者
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* no client subscribe the channel
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* >0：订阅该频道的订阅者数量
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* the number of clients that received the message
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*/
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int publish(const char* channel, const char* msg, size_t len);
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/**
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* 订阅给定的一个或多个频道的信息；在调用本函数后的操作只能发送的命令有：
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* subscribe、unsubscribe、psubscribe、punsubscribe、get_message，只有
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* 取消订阅了所有频道（或连接重建）后才摆脱该限制
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* subscribe one or more channel(s). Once the client enters the
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* subscribed state it is not supposed to issue any other commands,
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* except for additional SUBSCRIBE, PSUBSCRIBE, UNSUBSCRIBE
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* and PUNSUBSCRIBE commands
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* @param first_channel {const char*} 所订阅的频道列表的第一个非空字符串
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* 的频道，对于变参列表中的最后一个必须是 NULL
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* the first non-NULL channel in the channel list, and the last
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* parameter must be NULL indicating the end of the channel list
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* @return {int} 返回当前已经成功订阅的频道个数（即所订阅的所有频道数量）
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* the number of channels subscribed by the current client
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*/
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int subscribe(const char* first_channel, ...);
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int subscribe(const std::vector<const char*>& channels);
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int subscribe(const std::vector<string>& channels);
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/**
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* 取消订阅给定的一个或多个频道的信息
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* stop listening for messages posted to the given channels
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* @param first_channel {const char*} 所取消的所订阅频道列表的第一个频道
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* the fist channel in channel list, and the last parameter must be
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* NULL indicating the end of the channel list
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* @return {int} 返回剩余的所订阅的频道的个数
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* the rest channels listened by the current client
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*/
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int unsubscribe(const char* first_channel, ...);
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int unsubscribe(const std::vector<const char*>& channels);
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int unsubscribe(const std::vector<string>& channels);
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/**
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* 订阅一个或多个符合给定模式的频道；每个模式以 * 作为匹配符；在调用本函数后的操作
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* 只能发送的命令有：subscribe、unsubscribe、psubscribe、punsubscribe、
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* get_message，只有取消订阅了所有频道（或连接重建）后才摆脱该限制
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* listen for messages published to channels matching the give patterns
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* @param first_pattern {const char*} 第一个匹配模式串
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* the first pattern in pattern list, the last parameter must be NULL
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* int the variable args
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* @return {int} 返回当前已经成功订阅的频道个数（即所订阅的所有频道数量）
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* the number of channels listened by the current client
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*/
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int psubscribe(const char* first_pattern, ...);
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int psubscribe(const std::vector<const char*>& patterns);
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int psubscribe(const std::vector<string>& patterns);
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/**
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* 根据模式匹配串取消订阅给定的一个或多个频道的信息
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* stop listening for messaged posted to channels matching
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* the given patterns
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* @param first_pattern {const char*} 第一个匹配模式串
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* the first parttern in a variable args ending with NULL
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* @return {int} 返回剩余的所订阅的频道的个数
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* the rest number of channels be listened by the client
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*/
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int punsubscribe(const char* first_pattern, ...);
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int punsubscribe(const std::vector<const char*>& patterns);
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int punsubscribe(const std::vector<string>& patterns);
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/**
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* 在订阅频道后可以循环调用本函数从所订阅的频道中获取订阅消息；
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* 在调用 subscribe 或 psubscribe 后才可调用本函数来获取所订阅的频道的消息
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* get messages posted to channels after SUBSCRIBE or PSUBSCRIBE
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* @param channel {string&} 存放当前有消息的频道名
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* buffer for storing the channel associate with the msg
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* @param msg {string&} 存放当前获得的消息内容
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* store the message posted to the channel
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* @return {bool} 是否成功，如果返回 false 则表示出错
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* true on success, false on error
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*/
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bool get_message(string& channel, string& msg);
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/**
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* 列出当前的活跃频道：活跃频道指的是那些至少有一个订阅者的频道， 订阅模式的
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* 客户端不计算在内
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* Lists the currently active channels.
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* @param channels {std::vector<string>*} 非空时存放频道结果集
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* store the active channels
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* @param first_pattern {const char*} 作为附加的匹配模式第一个匹配字符串，
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* 该指针可以为 NULL，此时获取指所有的活跃频道；对于变参而言最后一个参数需为 NULL
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* the first pattern in a variable args ending with NULL arg, and
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* the first arg can be NULL.
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* @return {int} 返回活跃频道数； -1 表示出错
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* the number of active channels. -1 if error
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*
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* 操作成功后可以通过以下任一方式获得数据
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* 1、基类方法 get_value 获得指定下标的元素数据
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* 2、基类方法 get_child 获得指定下标的元素对象(redis_result），然后再通过
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* redis_result::argv_to_string 方法获得元素数据
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* 3、基类方法 get_result 方法取得总结果集对象 redis_result，然后再通过
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* redis_result::get_child 获得一个元素对象，然后再通过方式 2 中指定
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* 的方法获得该元素的数据
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* 4、基类方法 get_children 获得结果元素数组对象，再通过 redis_result 中
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* 的方法 argv_to_string 从每一个元素对象中获得元素数据
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* 5、在调用方法中传入非空的存储结果对象的地址
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*
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*/
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int pubsub_channels(std::vector<string>* channels,
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const char* first_pattern, ...);
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int pubsub_channels(const std::vector<const char*>& patterns,
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std::vector<string>* channels);
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int pubsub_channels(const std::vector<string>& patterns,
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std::vector<string>* channels);
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/**
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* 返回给定频道的订阅者数量， 订阅模式的客户端不计算在内
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* Returns the number of subscribers (not counting clients
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* subscribed to patterns) for the specified channels.
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* @param out {std::map<string, int>&} 存储查询结果，其中 out->first 存放
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* 频道名，out->second 在座该频道的订阅者数量
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* store the results
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* @param first_pattern {const char*} 作为附加的匹配模式第一个匹配字符串，
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* 该指针可以为 NULL，此时获取指所有的活跃频道；对于变参而言最后一个参数需为 NULL
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* the first pattern in a variable args ending with NULL arg, and
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* the first arg can be NULL.
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* @return {int} 频道的数量，-1 表示出错
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*/
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int pubsub_numsub(std::map<string, int>& out,
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const char* first_channel, ...);
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int pubsub_numsub(const std::vector<const char*>& channels,
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std::map<string, int>& out);
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int pubsub_numsub(const std::vector<string>& channels,
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std::map<string, int>& out);
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/**
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* 返回订阅模式的数量，这个命令返回的不是订阅模式的客户端的数量， 而是客户端订阅的
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* 所有模式的数量总和
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* Returns the number of subscriptions to patterns.
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* @return {int} 客户端所有订阅模式的总和，-1 表示出错
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* the number of patterns all the clients are subscribed to,
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* -1 if error.
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*/
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int pubsub_numpat();
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private:
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int subop(const char* cmd, const std::vector<const char*>& channels);
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int subop(const char* cmd, const std::vector<string>& channels);
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int check_channel(const redis_result* obj, const char* cmd,
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const string& channel);
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int pubsub_numsub(std::map<string, int>& out);
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};
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} // namespace acl
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