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255 lines
9.1 KiB
C++
255 lines
9.1 KiB
C++
#pragma once
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#include "../acl_cpp_define.hpp"
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#include <vector>
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#include <map>
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#include "../stdlib/string.hpp"
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#include "../redis/redis_command.hpp"
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namespace acl
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{
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typedef class redis_client disque_client;
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typedef class redis_client_pool disque_client_pool;
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typedef class redis_client_cluster disque_client_cluster;
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class disque_cond;
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class disque_node;
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class disque_job;
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/**
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* disque 命令操作类
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*/
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class ACL_CPP_API disque : 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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disque();
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/**
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* see redis_command::redis_command(redis_client*)
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*/
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disque(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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disque(redis_client_cluster* cluster, size_t max_conns);
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virtual ~disque();
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/////////////////////////////////////////////////////////////////////
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/**
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* add a job to the specified queue
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* 添加一个任务消息至指定的队列中
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* @param name {const char*} the name of the specified queue
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* 队列名称
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* @param job {const char*} a message to deliver
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* 任务消息字符串
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* @param timeout {int} the command timeout in milliseconds
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* 该命令执行的超时时间（毫秒）
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* @param args {const std::map<acl::string, int>*} the condition
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* for ADDJOB command, the conditions name include:
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* REPLICATE, DELAY, RETRY, TTL, MAXLEN, ASYNC, if the args was NULL,
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* none condition will be used in this operation
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* 添加消息的处理条件集合，对应的条件内容项：
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* REPLICATE -- 副本个数，
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* DELAY -- 指定任务在放入各个节点的队列之前， 需要等待多少秒钟
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* TTL -- 任务生存周期（秒）
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* MAXLEN -- 指定队列最多可以存放多少个待传递的任务
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* ASYNC -- 服务端采用异步方式将任务同步至其副本结点
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* @return {const char*} a ID of the job will be returned, NULL will
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* be returned if some error happened.
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* 返回任务 ID 号，如果返回 NULL 则表示出错
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*/
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const char* addjob(const char* name, const char* job,
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int timeout, const std::map<string, int>* args = NULL);
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const char* addjob(const char* name, const string& job,
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int timeout, const std::map<string, int>* args = NULL);
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const char* addjob(const char* name, const void* job, size_t job_len,
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int timeout, const std::map<string, int>* args = NULL);
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/**
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* add a job to the specified queue
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* 向指定消息队列添加任务
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* @param name {const char*} the name of the specified queue
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* 指定的消息队列名称
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* @param job {const char*} a message to deliver
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* 将添加的任务
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* @param timeout {int} the command timeout in milliseconds
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* 毫秒精度的命令超时限制
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* @param cond {const acl::disque_cond*} the condition for the ADDJOB
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* 添加任务的条件，参见类 disque_cond
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* @return {const char*} a ID of the job will be returned, NULL will
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* be returned if some error happened.
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* 返回任务 ID 号，如果返回 NULL 则表示出错
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*/
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const char* addjob(const char* name, const char* job,
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int timeout, const disque_cond* cond);
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const char* addjob(const char* name, const string& job,
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int timeout, const disque_cond* cond);
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const char* addjob(const char* name, const void* job, size_t job_len,
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int timeout, const disque_cond* cond);
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/**
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* get jobs from the specified queues, or return NULL if the timeout
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* is reached.
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* 从指定的队列集合中获得取指定最大数量的任务
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* @param names {const std::vector<acl::string>&} the specified queues
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* 指定的列表名称集合
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* @param timeout {int} the command timeout in milliseconds
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* 毫秒精度的命令超时限制
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* @param count {size_t} the max count of the jobs to be got
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* 指定了返回任务结果集的最大个数限制
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* @return {const std::vector<acl::disque_job*>*} return the jobs,
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* or return NULL if the timeout is reached or some error happens.
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* 返回结果集。如果超时或发生错误则返回 NULL
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*/
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const std::vector<disque_job*>* getjob(const std::vector<string>& names,
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size_t timeout, size_t count);
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const std::vector<disque_job*>* getjob(const char* name,
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size_t timeout, size_t count);
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/**
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* acknowledge the execution of one or more jobs via IDs. The node
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* receiving the ACK will replicate it to multiple nodes and will try
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* to garbage collect both the job and the ACKs from the cluster so
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* that memory can be freed.
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* 通过给定任务 ID ， 向节点告知任务已经被执行。接收到 ACK 消息的节点会将该消息
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* 复制至多个节点， 并尝试对任务和来自集群的 ACK 消息进行垃圾回收操作， 从而释放
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* 被占用的内存。
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* @param job_ids {const std::vector<acl::string>&} the jobs' IDs
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* 任务 ID 集合
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* @return {int} return the number of IDs been ACKed, -1 will be
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* returned if some error happened
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* 返回被确认的任务个数，如果出错则返回 -1
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*/
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int ackjob(const std::vector<string>& job_ids);
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/**
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* perform a best effort cluster wide detection of the specified
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* job IDs.
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* 尽最大努力在集群范围内对给定的任务进行删除；在网络连接良好并且所有节点都在线时，
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* 这个命令的效果和 ACKJOB 命令的效果一样， 但是因为这个命令引发的消息交换比
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* ACKJOB 要少， 所以它的速度比 ACKJOB 要快不少；但是当集群中包含了失效节点的
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* 时候， FASTACK 命令比 ACKJOB 命令更容易出现多次发送同一消息的情况
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* @param job_ids {const std::vector<acl::string>&} the jobs' IDs
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* 任务 ID 集合
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* @return {int} return the number of IDs been ACKed, -1 will be
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* returned if some error happened
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* 返回被确认的任务个数，如果出错则返回 -1
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*/
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int fastack(const std::vector<string>& job_ids);
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/**
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* peek some jobs no more than the specified count from the specified
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* queue and remain these jobs in queue.
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* 在不取出任务的情况下， 从队列里面返回指定数量的任务
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* @param name {const char*} the specified queue
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* 指定的队列名称
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* @param count {int} limit the max count of jobs to be got
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* 限定了返回结果集的最大数量
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* @return {const std::vector<acl::disque_job*>*} return the jobs
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* if the queue isn't empty. NULL will be returned if the queue
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* is empty or some error happened.
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* 返回结果集，如果队列为空或出错则返回 NULL
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*/
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const std::vector<disque_job*>* qpeek(const char* name, int count);
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/**
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* get the number of jobs stored in the specified queue
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* 获得指定队列中的任务数量
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* @param name {const char*} the specified queue
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* 指定的队列名称
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* @return {int} return the number of the jobs in queue
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* 返回指定队列中的任务数量，返回出错则返回 -1
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*/
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int qlen(const char* name);
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/**
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* get the stat information of the specified job by job id
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* 根据任务 ID 获得任务的相关信息
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* @param job_id {const char*} the id of the job
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* 指定的任务 ID
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* @return {const acl::disque_job*} return the job's information,
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* return NULL if the job doesn't exist or some error happens.
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* 返回指定任务的信息，参考类 disque_job；如果任务不存在或出错则返回 NULL
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*/
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const disque_job* show(const char* job_id);
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/**
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* queue jobs if not already queued
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* 如果给定任务未被放入到队列里， 则把它们放入到队列里
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* @param job_ids {const std::vector<acl::string>&} the job IDs
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* 指定的任务 ID 集合
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* @return {int} return the number of jobs been queued, -1 will be
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* returned if some error happens.
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* 返回被放入队列里的任务数量，如果出错则返回 -1
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*/
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int enqueue(const std::vector<string>& job_ids);
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/**
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* remove the jobs from the queue
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* 从队列里面移除指定的任务
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* @param job_ids {const std::vector<acl::string>&} the job IDs
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* 准备移除的任务 ID 集合
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* @return {int} return the number of jobs been removed, -1 will be
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* returned if some error happens.
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* 返回被移除的任务数量，如果出错则返回 -1
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*/
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int dequeue(const std::vector<string>& job_ids);
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/**
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* completely delete a job from a node.
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* 在节点里面彻底地删除给定的任务。 这个命令和 FASTACK 很相似， 唯一的不同是，
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* DELJOB 命令引发的删除操作只会在单个节点里面执行， 它不会将 DELJOB 集群总线
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* 消息（cluster bus message）发送至其他节点
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* @param job_ids {const std::vector<acl::string>&} the job IDs
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* 被删除的任务 ID 集合
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* @return {int} return the number of jobs been deleted, -1 will be
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* returned if some error happens.
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* 返回被删除的任务数量，如果出错则返回 -1
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*/
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int deljob(const std::vector<string>& job_ids);
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/**
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* display the information of the disque cluster
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* 获得当前集群的状态信息
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* @param out {std::map<acl::string, acl::string>&} store result
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* 存储结果
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* @return {bool} if the operation is successful
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* 操作是否正常，如果出错则返回 false
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*/
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bool info(std::map<string, string>& out);
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/**
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* get the information of all the nodes in the cluster
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* 获得集群中所有结点的信息
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* @return {const std::vector<acl::disque_node*>*} all the nodes'
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* information in the cluster, return NULL if some error happened.
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* 返回集群中所有结点信息的结果集，如果出错则返回 NULL；参考类 disque_node
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*/
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const std::vector<disque_node*>* hello();
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private:
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int jobs_bat(const std::vector<string>& job_ids, const char* cmd);
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private:
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disque_job* job_;
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std::vector<disque_job*> jobs_;
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const std::vector<disque_job*>* get_jobs(const char* name);
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void free_jobs();
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private:
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int version_;
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string myid_;
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std::vector<disque_node*> nodes_;
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disque_node* create_node(const redis_result* rr);
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void free_nodes();
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};
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} // namespace acl
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