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：
- The Path Root for the Server Application
- Killer for Termanting the Server Application
- 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(__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 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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