一.Broker模块介绍

二.Broker模块具体实现

1. 类的成员变量与构造函数

成员变量

• 事件循环和TCP服务器:

  • muduo::net::EventLoop _baseloop;
  • muduo::net::TcpServer _server; 这些是muduo库提供的核心组件，负责处理网络事件和管理TCP连接。

• 消息分发和编码:

  • muduo::net::ProtobufDispatcher _dispatcher;
  • muduo::net::ProtobufCodec _codec; 这些是muduo库中用于处理Protocol Buffers消息的工具，_dispatcher负责根据消息类型调用对应的回调函数，_codec用于处理消息的序列化与反序列化。

• 连接管理器:

  • ConnectionManager _connectionManager; 管理所有的客户端连接，确保在处理消息时能获取到正确的连接信息。

• 消费者管理器:

  • ConsumerManager _consumerManager; 管理所有的消费者，处理消息的订阅与消费逻辑。

• 虚拟机:

  • VirtualHost _virtualHost; 在消息队列系统中，虚拟机管理交换机、队列等资源。

• 线程池:

  • muduo::ThreadPool _threadPool; 用于处理耗时的任务，避免阻塞主线程的事件循环。

构造函数

 Broker(int port, std::string dbname, std::string msgdir)             : _server(&_baseloop, muduo::net::InetAddress("127.0.0.1", port), "MyBroker", muduo::net::TcpServer::kReusePort),               _dispatcher(std::bind(&Broker::onUnknowMessage, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)),               _codec(std::make_shared(std::bind(&ProtobufDispatcher::onProtobufMessage, &_dispatcher, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3))),               _connections(std::make_shared()),               _consumers(std::make_shared()),               _pool(std::make_shared(1)),               _vhost(std::make_shared(virtualHost, dbname, msgdir))         {             // 1.将所有的消息回调函数注册到_dispatcher中             //_dispatcher.registerMessageCallback(std::bind(&Broker::onOpenChannel,this,std::placeholders::_1,std::placeholders::_2,std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onOpenChannel, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onCloseChannel, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onDeclareExchange, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onRemoveExchange, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onDeclareQueue, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onRemoveQueueReq, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBind, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onUnBind, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBasicPublish, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBasicAck, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBasicSubscribe, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBasicCancel, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));              // 2._server设置连接回调函数和消息回调函数             _server.setConnectionCallback(std::bind(&Broker::onConnection, this, std::placeholders::_1));             _server.setMessageCallback(std::bind(&ProtobufCodec::onMessage, _codec.get(), std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));         }

• 初始化_server: 创建一个TCP服务器，监听指定的地址，并绑定了连接回调函数和消息回调函数。
• 初始化_dispatcher和_codec: 负责消息的分发和编码处理。
• 注册消息回调函数: 将各种消息类型的处理函数注册到_dispatcher，确保接收到特定类型的消息时能够调用对应的处理逻辑。

2. 服务器的启动与连接管理

服务器启动

void start() {     _server.start();     _baseloop->loop(); } 

• _server.start(): 启动TCP服务器，开始监听并接受客户端连接。
• _baseloop->loop(): 进入事件循环，处理所有的网络事件和定时任务

连接管理

void onConnection(const muduo::net::TcpConnectionPtr& conn) {     if (conn->connected()) {         // 处理新连接         std::shared_ptr connection = std::make_shared(conn);         _connectionManager.addConnection(connection);     } else {         // 处理连接关闭         _connectionManager.removeConnection(conn);     } } 

• 新连接的建立: 当有新的连接建立时，创建一个Connection对象，并将其添加到_connectionManager。
• 连接的关闭: 当连接断开时，从_connectionManager中移除该连接。

  void onUnknowMessage(const muduo::net::TcpConnectionPtr &conn,                              const MessagePtr &message,                              muduo::Timestamp receiveTime)         {             LOG_INFO << "unknow message: " << message->GetTypeName();             conn->shutdown();         }

3.消息回调函数的实现

接收到来自客户端的不同类型的请求时,通过_dispatcher调用对应的消息处理回调函数

打开/关闭信道

拿到连接,然后打开信道即可.

其它消息处理回调函数

拿到连接+打开信道+利用信道调用服务端对应的函数即可.

4.线程池的实现

1. 成员变量

    using Task = std::function;

ThreadPool类的成员变量主要包括以下几部分：

• 任务队列 (std::vector _tasks)：

  • 用于存储待执行的任务，每个任务都是一个std::function类型的可调用对象。

• 线程相关 (std::vector _threads)：

  • 用于存储线程池中的所有线程，这些线程会循环执行任务队列中的任务。

• 同步机制 (std::mutex _mutex 和 std::condition_variable _cond)：

  • _mutex用于保护任务队列，防止多个线程同时访问任务队列时出现竞争条件。
  • _cond用于在线程等待和唤醒时进行同步控制，当任务队列中有新任务时，唤醒等待的线程。

• 线程池状态 (std::atomic _is_stop)：

  • 这是一个原子变量，用于标志线程池是否停止工作。当设置为true时，线程池将停止接受新任务并退出。

2. 构造函数与析构函数

构造函数，用于初始化线程池并启动指定数量的线程。

析构函数，用于停止线程池并等待所有线程退出。

3.push的实现

push函数用于向线程池提交新任务。该函数是模板函数，能够接受任意类型的函数和参数，并将其封装为异步任务。

• 任务封装：使用std::bind将函数和参数绑定在一起，然后使用std::packaged_task将其封装成异步任务。
• push到任务队列：将任务添加到任务队列_tasks中。
• 唤醒线程：通过_cond.notify_one()唤醒一个等待中的线程去执行任务。
• 返回std::future：返回一个std::future对象，用户可以通过它获取任务的执行结果。

4.entry

• 等待任务：线程通过_cond.wait等待，直到任务队列中有任务或线程池停止。
• 任务处理：取出所有任务并执行。通过交换_tasks和临时任务列表tmp，避免频繁加锁解锁。

5.stop

• 设置停止标志：将_is_stop设置为true，标志着线程池将停止工作。
• 唤醒所有线程：通过_cond.notify_all()唤醒所有等待中的线程，以便它们可以检查停止标志并退出。
• 等待线程退出：调用join()等待每个线程退出。

6.线程池全部代码

#pragma once #include  #include  #include  #include  #include  #include  #include  #include  #include  #include   class ThreadPool { public:     using ptr = std::shared_ptr;     ThreadPool(int thread_num = 1)     {         // 初始化线程池,创建thread_num个线程,每个线程执行entry函数         _is_stop = false;         for (int i = 0; i < thread_num; i++)         {             _threads.emplace_back(&ThreadPool::entry, this);//用这些参数来构造对象         }     }     ~ThreadPool()     {         stop();     }      using Task = std::function;      // 用户传入要执行的函数和参数,push内部封装成packaged_task异步任务,利用lambda生成可调用对象并放入队列中     template      auto push(F &&func, Args &&...args) -> std::future     {         using return_type = decltype(func(args...));         auto obj = std::bind(std::forward(func), std::forward(args)...);         auto ptask = std::make_shared>(obj);         std::future future = ptask->get_future();          {             std::unique_lock lock(_mutex);             // 将可调用对象放入队列             _tasks.push_back([ptask]()                              { (*ptask)(); });             // 唤醒一个线程             _cond.notify_one();         }         return future;     }      void stop()     {         if (_is_stop == true)             return;         _is_stop = true;         _cond.notify_all();         for (auto &t : _threads)         {             t.join();         }     }  private:     void entry() // 线程入口函数     {         while (_is_stop == false)         {             // 一个线程一次将队列中的所有任务都取出,避免频繁加锁解锁             std::vector tmp;             {                 std::unique_lock lock(_mutex);                 _cond.wait(lock, [this]()                 { return !_tasks.empty() || _is_stop; });                  tmp.swap(_tasks);             }             for(auto &task:tmp)             {                 task();             }         }     }  private:     // 任务队列     std::vector _tasks;     // 同步互斥,锁相关     std::mutex _mutex;     std::condition_variable _cond;     // 一批线程     std::vector _threads;     // 结束标志     std::atomic _is_stop; };  

三.全部代码

#pragma once  #include "connection.hpp" #include "../include/muduo/net/Buffer.h" #include "../include/muduo/net/EventLoop.h" #include "../include/muduo/net/TcpServer.h" #include "../include/muduo/base/noncopyable.h" #include "../include/muduo/net/Callbacks.h" #include "proto/dispatcher.h" #include "proto/codec.h" #include "../include/muduo/base/Logging.h" #include "../include/muduo/base/Mutex.h" #include  #include   namespace mq {     class Broker     {     private:         const std::string virtualHost = "defaultHost"; // 默认虚拟机名称          // 1.muduo库服务器相关         // 服务器和事件循环         muduo::net::EventLoop _baseloop;         muduo::net::TcpServer _server;         // Protobuf消息分发器         ProtobufDispatcher _dispatcher;         // Protobuf协议处理器,解决粘包等问题,提取出一个完整的请求报文,并交给_dispatcher处理         mq::ProtobufCodecPtr _codec;         // 2.消息队列相关         ConnectionManager::ptr _connections; // 连接管理器         VirtualHost::ptr _vhost;             // 虚拟机         ConsumerManager::ptr _consumers;     // 消费者管理器         ThreadPool::ptr _pool;               // 线程池      public:         Broker(int port, std::string dbname, std::string msgdir)             : _server(&_baseloop, muduo::net::InetAddress("127.0.0.1", port), "MyBroker", muduo::net::TcpServer::kReusePort),               _dispatcher(std::bind(&Broker::onUnknowMessage, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)),               _codec(std::make_shared(std::bind(&ProtobufDispatcher::onProtobufMessage, &_dispatcher, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3))),               _connections(std::make_shared()),               _consumers(std::make_shared()),               _pool(std::make_shared(1)),               _vhost(std::make_shared(virtualHost, dbname, msgdir))         {             // 1.将所有的消息回调函数注册到_dispatcher中             //_dispatcher.registerMessageCallback(std::bind(&Broker::onOpenChannel,this,std::placeholders::_1,std::placeholders::_2,std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onOpenChannel, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onCloseChannel, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onDeclareExchange, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onRemoveExchange, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onDeclareQueue, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onRemoveQueueReq, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBind, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onUnBind, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBasicPublish, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBasicAck, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBasicSubscribe, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));             _dispatcher.registerMessageCallback(std::bind(&Broker::onBasicCancel, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));              // 2._server设置连接回调函数和消息回调函数             _server.setConnectionCallback(std::bind(&Broker::onConnection, this, std::placeholders::_1));             _server.setMessageCallback(std::bind(&ProtobufCodec::onMessage, _codec.get(), std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));         }         void start()         {             _server.start();             _baseloop.loop();         }      private:         void onConnection(const muduo::net::TcpConnectionPtr &conn)         {             if (conn->connected())             {                 DLOG("new connection from:%s ", conn->peerAddress().toIpPort().c_str());                 _connections->addConnection(std::make_shared(), _vhost, _consumers, conn, _codec, _pool);             }             else             {                 DLOG("connection from:%s closed", conn->peerAddress().toIpPort().c_str());                 _connections->removeConnection(conn);             }         }         void onUnknowMessage(const muduo::net::TcpConnectionPtr &conn,                              const MessagePtr &message,                              muduo::Timestamp receiveTime)         {             LOG_INFO << "unknow message: " << message->GetTypeName();             conn->shutdown();         }          //-----------------------一系列消息回调函数---------------------------------         // 1.打开/关闭信道'         void onOpenChannel(const muduo::net::TcpConnectionPtr &conn,                            const OpenChannelPtr &req,                            muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onOpenChannel: connection is null");                 conn->shutdown();                 return;             }             connection->openChannel(req);         }         void onCloseChannel(const muduo::net::TcpConnectionPtr &conn,                             const CloseChannelReqPtr &req,                             muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onCloseChannel: connection is null");                 conn->shutdown();                 return;             }             connection->closeChannel(req);         }         // 2.声明/移除交换机         void onDeclareExchange(const muduo::net::TcpConnectionPtr &conn,                                const DeclareExchangeReqPtr &req,                                muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onDeclareExchange: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onDeclareExchange: channel is null");                 conn->shutdown();                 return;             }             channel->declareExchange(req);         }         void onRemoveExchange(const muduo::net::TcpConnectionPtr &conn,                               const RemoveExchangeReqPtr &req,                               muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onRemoveExchange: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onRemoveExchange: channel is null");                 conn->shutdown();                 return;             }             channel->removeExchange(req);         }         // 3.声明/移除队列         void onDeclareQueue(const muduo::net::TcpConnectionPtr &conn,                             const DeclareQueueReqPtr &req,                             muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onDeclareQueue: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onDeclareQueue: channel is null");                 conn->shutdown();                 return;             }             channel->declareQueue(req);         }         void onRemoveQueueReq(const muduo::net::TcpConnectionPtr &conn,                               const RemoveQueueReqPtr &req,                               muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onRemoveQueueReq: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onRemoveQueueReq: channel is null");                 conn->shutdown();                 return;             }             channel->removeQueue(req);         }         // 4.绑定/解除绑定         void onBind(const muduo::net::TcpConnectionPtr &conn,                     const BindReqPtr &req,                     muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onBind: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onBind: channel is null");                 conn->shutdown();                 return;             }             channel->bind(req);         }         void onUnBind(const muduo::net::TcpConnectionPtr &conn,                       const UnbindReqPtr &req,                       muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onUnBind: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onUnBind: channel is null");                 conn->shutdown();                 return;             }             channel->unbind(req);         }         // 5.发布/确认消息         void onBasicPublish(const muduo::net::TcpConnectionPtr &conn,                             const BasicPublishReqPtr &req,                             muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onBasicPublish: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onBasicPublish: channel is null");                 conn->shutdown();                 return;             }             channel->basicPublish(req);         }         void onBasicAck(const muduo::net::TcpConnectionPtr &conn,                         const BasicAckReqPtr &req,                         muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onBasicAck: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onBasicAck: channel is null");                 conn->shutdown();                 return;             }             channel->basicAck(req);         }         // 6.订阅和取消订阅         void onBasicSubscribe(const muduo::net::TcpConnectionPtr &conn,                               const BasicSubscribeReqPtr &req,                               muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onBasicSubscribe: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onBasicSubscribe: channel is null");                 conn->shutdown();                 return;             }             channel->basicSubscribe(req);         }         void onBasicCancel(const muduo::net::TcpConnectionPtr &conn,                            const BasicCancelReqPtr &req,                            muduo::Timestamp receiveTime)         {             auto connection = _connections->getConnection(conn);             if (connection.get() == nullptr)             {                 DLOG("onBasicCancel: connection is null");                 conn->shutdown();                 return;             }             auto channel = connection->getChannel(req->chid());             if (channel.get() == nullptr)             {                 DLOG("onBasicCancel: channel is null");                 conn->shutdown();                 return;             }             channel->basicCancel(req);         }     }; };