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149 lines
4.3 KiB
C++
149 lines
4.3 KiB
C++
#pragma once
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#include "../acl_cpp_define.hpp"
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#include <vector>
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#include "../stdlib/string.hpp"
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#include "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 ACL_CPP_API redis_transaction : 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_transaction(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_transaction(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_transaction(redis_client_cluster* cluster, size_t max_conns = 0);
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virtual ~redis_transaction(void);
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/////////////////////////////////////////////////////////////////////
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/**
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* 监视一个(或多个) key ，如果在事务执行之前这个(或这些) key 被其他命令所改动，
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* 那么事务将被打断
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* watch the given keys to determine execution of the MULTI/EXEC
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* block, before EXEC some of the given keys were changed outer,
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* the transaction will break
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* @param keys {const std::vector<string>&} key 集合
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* the given keys collection
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* @return {bool} 操作是否成功，即使 key 集合中的有 key 不存在也会返回成功
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* if success of this operation
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*/
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bool watch(const std::vector<string>& keys);
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/**
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* 取消 WATCH 命令对所有 key 的监视
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* forget about all watched keys
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* @return {bool} 操作是否成功
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* if success of this operation
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*/
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bool unwatch(void);
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/**
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* 标记一个事务块的开始，事务块内的多条命令会按照先后顺序被放进一个队列当中，
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* 最后由 EXEC 命令原子性(atomic)地执行
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* mark the start of a transaction block
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* @return {bool} 操作是否成功
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* if success of this operation
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*/
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bool multi(void);
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/**
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* 执行所有事务块内的命令，假如某个(或某些) key 正处于 WATCH 命令的监视之下，
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* 且事务块中有和这个(或这些) key 相关的命令，那么 EXEC 命令只在这个(或这些)
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* key 没有被其他命令所改动的情况下执行并生效，否则该事务被打断(abort)；
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* 在执行本条命令成功后，可以调用下面的 get_size()/get_child() 获得每条命令的
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* 操作结果
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* execute all commands issued after MULTI
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* @return {bool} 操作是否成功
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* if success of this operation
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*/
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bool exec(void);
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/**
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* 取消事务，放弃执行事务块内的所有命令，如果正在使用 WATCH 命令监视某个(或某些)
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* key，那么取消所有监视，等同于执行命令 UNWATCH
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* discard all commands issued after MULTI
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* @return {bool}
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*/
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bool discard(void);
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/**
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* 在 multi 和 exec 之间可多次调用本函数执行多条 redis 客户端命令
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* run one command between MULTI and EXEC
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* @param cmd {const char*} redis 命令
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* the command
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* @param argv {const char* []} 参数数组
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* the args array associate with the command
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* @param lens [const size_t []} 参数的长度数组
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* the length array of the args array
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* @param argc {size_t} 参数数组的长度
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* the length of the array for args
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* @return {bool} 操作是否成功
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* if successful
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*/
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bool run_cmd(const char* cmd, const char* argv[],
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const size_t lens[], size_t argc);
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/**
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* 在 multi 和 exec 之间多次调用本函数执行多条 redis 客户端命令
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* run one command between MULTI and exec, this function can be
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* called more than once
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* @param cmd {const char*} redis 命令
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* the redis command
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* @param args {const std::vector<string>&} 参数数组
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* the args array for the command
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* @return {bool} 操作是否成功
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* if successful
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*/
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bool run_cmd(const char* cmd, const std::vector<string>& args);
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/**
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* 在成功调用 exec 后调用本函数获得操作结果数组的长度
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* get the result array's length after EXEC
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* @return {size_t}
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*/
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size_t get_size(void) const;
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/**
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* 获取指定下标的对应的命令的执行结果对象
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* get the result of the given subscript
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* @param i {size_t} 命令执行结果在结果数组中的下标
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* the given subscript
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* @param cmd {string*} 该参数非空时存放对应的 redis 命令
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* if not NULL, it will store the command of the given subscript
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* @return {const redis_result*} 执行某条命令的结果，当 i 越界时返回 NULL
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* return the result of one command, NULL if i was out of bounds
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*/
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const redis_result* get_child(size_t i, string* cmd) const;
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/**
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* 获得当前事务所重的命令集合
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* get all the commands issued between MULTI and EXEC
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* @return {const std::vector<string>&}
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*/
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const std::vector<string>& get_commands(void) const
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{
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return cmds_;
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}
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private:
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std::vector<string> cmds_;
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};
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} // namespace acl
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