OpenRTMFP/Cumulus Primer（6）CumulusServer启动流程分析（续2）

OpenRTMFP/Cumulus Primer（6）CumulusServer启动流程分析（续2）

• 作者：柳大Poechant（钟超）
• 博客：Blog.CSDN.net/Poechant
• 邮箱：zhongchao.ustc#gmail.com (# -> @)
• 日期：April 14th, 2012

  1 main.cpp 中的main()函数中的server

  main.cpp 中真正启动的是server，它继承自Cumulus::RTMFPServer，而Cumulus::RTMFPServer?又继承自Cumulus::Startable、Cumulus::Gateway、Cumulus::Handler。而Cumulus::Startable继承自Poco::Runnable，所以其是一个可以运行的线程。在OpenRTMFP/CumulusServer中，这是主线程。

  Server server(config().getString("application.dir", "./"), *this, config());server.start(params);

  这是CumulusServer/Server.h中定义的，其构造函数的原型为：

  Server(const std::string& root,       ApplicationKiller& applicationKiller,       const Poco::Util::AbstractConfiguration& configurations);

  个参数含义如下：

  1. The Path Root for the Server Application
  2. Killer for Termanting the Server Application
  3. Server Configuration

  距离来说，在我的 Worksapce 中：

  • root是/Users/michael/Development/workspace/eclipse/OpenRTMFP-Cumulus/Debug/

    构造函数的初始化列表极长：

    Server::Server(const std::string& root,               ApplicationKiller& applicationKiller,               const Util::AbstractConfiguration& configurations)     : _blacklist(root + "blacklist", *this),      _applicationKiller(applicationKiller),      _hasOnRealTime(true),      _pService(NULL),      luaMail(_pState=Script::CreateState(),              configurations.getString("smtp.host","localhost"),              configurations.getInt("smtp.port",SMTPSession::SMTP_PORT),              configurations.getInt("smtp.timeout",60)) {

    下面调用Poco::File创建目录：

        File((string&)WWWPath = root + "www").createDirectory();

    因为roor是/Users/michael/Development/workspace/eclipse/OpenRTMFP-Cumulus/Debug/目录，所以WWWPath就是/Users/michael/Development/workspace/eclipse/OpenRTMFP-Cumulus/Debug/www目录。然后初始化GlobalTable，这个GlobalTable是和 Lua 有关的东东，这里暂不细说，先知道与 Lua 相关就好。

        Service::InitGlobalTable(_pState);

    下面就涉及到了 Lua script 了：

        SCRIPT_BEGIN(_pState)        SCRIPT_CREATE_PERSISTENT_OBJECT(Invoker,LUAInvoker,*this)        readNextConfig(_pState,configurations,"");        lua_setglobal(_pState,"cumulus.configs");    SCRIPT_END}

    其中SCRIPT_BEGIN、SCRIPT_CREATE_PERSISTENT_OBJECT和SCRIPT_END都是宏，其定义在Script.h文件中，如下：

    #define SCRIPT_BEGIN(STATE) \    if (lua_State* __pState = STATE) { \        const char* __error=NULL;#define SCRIPT_CREATE_PERSISTENT_OBJECT(TYPE,LUATYPE,OBJ) \    Script::WritePersistentObject<TYPE,LUATYPE>(__pState,OBJ); \    lua_pop(__pState,1);#define SCRIPT_END }

    SCRIPT_BEGIN和SCRIPT_END经常用到，当与 Lua 相关的操作出现时，都会以这两个宏作为开头和结尾。

    2 main.cpp 中main()函数的server.start()

    void RTMFPServer::start(RTMFPServerParams& params) {

    如果OpenRTMFP/CumulusServer正在运行，则返回并终止启动。

        if(running()) {        ERROR("RTMFPServer server is yet running, call stop method before");        return;    }

    设定端口号，如果端口号为 0，则返回并终止启动。

        _port = params.port;    if (_port == 0) {        ERROR("RTMFPServer port must have a positive value");        return;    }

    设定OpenRTMFP/CumulusEdge的端口号，如果其端口号与OpenRTMFP/CumulusSever端口号相同，则返回并终止启动：

        _edgesPort = params.edgesPort;    if(_port == _edgesPort) {        ERROR("RTMFPServer port must different than RTMFPServer edges.port");        return;    }

    Cirrus：

        _freqManage = 2000000; // 2 sec by default    if(params.pCirrus) {        _pCirrus = new Target(*params.pCirrus);        _freqManage = 0; // no waiting, direct process in the middle case!        NOTE("RTMFPServer started in man-in-the-middle mode with server %s \             (unstable debug mode)", _pCirrus->address.toString().c_str());    }

    middle：

        _middle = params.middle;    if(_middle)        NOTE("RTMFPServer started in man-in-the-middle mode between peers \              (unstable debug mode)");

    UDP Buffer：

        (UInt32&)udpBufferSize =         params.udpBufferSize==0 ?             _socket.getReceiveBufferSize() : params.udpBufferSize;    _socket.setReceiveBufferSize(udpBufferSize);    _socket.setSendBufferSize(udpBufferSize);    _edgesSocket.setReceiveBufferSize(udpBufferSize);    _edgesSocket.setSendBufferSize(udpBufferSize);    DEBUG("Socket buffer receving/sending size = %u/%u",        udpBufferSize,        udpBufferSize);    (UInt32&)keepAliveServer =         params.keepAliveServer < 5 ? 5000 : params.keepAliveServer * 1000;    (UInt32&)keepAlivePeer =         params.keepAlivePeer < 5 ? 5000 : params.keepAlivePeer * 1000;    (UInt8&)edgesAttemptsBeforeFallback = params.edgesAttemptsBeforeFallback;    setPriority(params.threadPriority);

    启动线程，进入循环运行：

        Startable::start();}

    上句具体的源码实现为：

    void Startable::start() {    if (running())        return;

    如果在运行则返回并终止启动。然后加一个局部锁。

        ScopedLock<FastMutex> lock(_mutex);

    如果不得不join()到主线程中，那就join()吧

        if(_haveToJoin) {        _thread.join();        _haveToJoin=false;    }

    然后就运行这个线程吧：

        _terminate = false;    _thread.start(*this);    _haveToJoin = true;}

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