khanat-opennel-code/code/nel/src/net/stdin_monitor_thread.cpp

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2010-05-06 00:08:41 +00:00
//-----------------------------------------------------------------------------
// includes
//-----------------------------------------------------------------------------
#include "stdnet.h"
#include "nel/misc/common.h"
#include "nel/misc/thread.h"
#include "nel/misc/command.h"
#include "stdin_monitor_thread.h"
//-----------------------------------------------------------------------------
// namespace: NLNET
//-----------------------------------------------------------------------------
namespace NLNET
{
//-----------------------------------------------------------------------------
// class CStdinMonitorThread
//-----------------------------------------------------------------------------
class CStdinMonitorThread : public NLMISC::IRunnable
{
public:
// ctor
CStdinMonitorThread();
// main routine executed when the thread is started
void run();
// interface for adding commands, retrieving commands and verifying whether there are commands waiting
void pushCommand(std::string nextCommand);
std::string popCommand();
bool commandWaiting() const;
private:
std::string _NextCommand;
volatile bool _CommandWaiting;
};
//-----------------------------------------------------------------------------
// methods CStdinMonitorThread
//-----------------------------------------------------------------------------
CStdinMonitorThread::CStdinMonitorThread()
{
_CommandWaiting= false;
}
void CStdinMonitorThread::run ()
{
while(!feof(stdin))
{
// wait for the main thread to deal with the previous command
while (commandWaiting())
{
NLMISC::nlSleep(1);
}
// get the next command from the command line
char theCommand[1024] = "";
fgets(theCommand, sizeofarray(theCommand), stdin);
// push the command to allow reader thread to deal with it
pushCommand(theCommand);
}
}
void CStdinMonitorThread::pushCommand(std::string nextCommand)
{
// wait for the previous command to be treated
while (_CommandWaiting)
{
NLMISC::nlSleep(1);
}
// copy the next command into the appropriate buffer
_NextCommand= nextCommand;
while (!_NextCommand.empty()
&& (_NextCommand[_NextCommand.size()-1] == '\n'
|| _NextCommand[_NextCommand.size()-1] == '\r'))
{
_NextCommand = _NextCommand.substr(0, _NextCommand.size()-1);
}
// set the _CommandWaiting flag, to allow reader thread to treat the new command
_CommandWaiting= true;
}
std::string CStdinMonitorThread::popCommand()
{
// wait for a command to be ligned up (waiting)
while (!_CommandWaiting)
{
}
// copy out the next command
std::string result= _NextCommand;
// clear out the next command variable ready for its next use
_NextCommand.clear();
// clear the _CommandWaiting flag, to allow writer thread to add a new command
_CommandWaiting= false;
// all done so return the command
return result;
}
bool CStdinMonitorThread::commandWaiting() const
{
return _CommandWaiting;
}
//-----------------------------------------------------------------------------
// class CStdinMonitorSingleton
//-----------------------------------------------------------------------------
class CStdinMonitorSingleton: public IStdinMonitorSingleton
{
public:
// static for getting hold of the singleton instance
static CStdinMonitorSingleton* getInstance();
// methods required by IStdinMonitorSingleton
void init();
void update();
void release();
private:
// this is a singleton so dissallow construction from outside...
CStdinMonitorSingleton();
CStdinMonitorSingleton(const CStdinMonitorSingleton&);
CStdinMonitorSingleton& operator =(const CStdinMonitorSingleton&);
private:
// data for the singleton instance
CStdinMonitorThread* _StdinMonitorThreadInstance;
NLMISC::IThread* _StdinMonitorThreadHandle;
};
//-----------------------------------------------------------------------------
// methods IStdinMonitorSingleton
//-----------------------------------------------------------------------------
IStdinMonitorSingleton* IStdinMonitorSingleton::getInstance()
{
return CStdinMonitorSingleton::getInstance();
}
//-----------------------------------------------------------------------------
// methods CStdinMonitorSingleton
//-----------------------------------------------------------------------------
CStdinMonitorSingleton* CStdinMonitorSingleton::getInstance()
{
static CStdinMonitorSingleton* instance= NULL;
if (instance==NULL)
instance= new CStdinMonitorSingleton;
return instance;
}
void CStdinMonitorSingleton::init()
{
_StdinMonitorThreadInstance= new CStdinMonitorThread;
_StdinMonitorThreadHandle = NLMISC::IThread::create (_StdinMonitorThreadInstance, 1024*4*4);
_StdinMonitorThreadHandle->start();
}
void CStdinMonitorSingleton::update()
{
// if we're not initialised yet then return
if (_StdinMonitorThreadInstance== NULL)
return;
// if there's a command waiting then treat it (not more than one command per visit)
if (_StdinMonitorThreadInstance->commandWaiting())
{
std::string nextCommand= _StdinMonitorThreadInstance->popCommand();
if (!nextCommand.empty())
{
NLMISC::ICommand::execute(nextCommand,*NLMISC::InfoLog);
}
}
}
void CStdinMonitorSingleton::release()
{
// if we've never been initialised or we've already been released thent there's nothing more to do...
if (_StdinMonitorThreadInstance== NULL)
return;
// terminate the thread and wait for it to finish
_StdinMonitorThreadHandle->terminate();
_StdinMonitorThreadHandle->wait();
// destroy the thread object instance and reset the pointer to NULL to mark as 'uninitialised'
delete _StdinMonitorThreadInstance;
_StdinMonitorThreadInstance= NULL;
}
CStdinMonitorSingleton::CStdinMonitorSingleton()
{
_StdinMonitorThreadHandle= NULL;
_StdinMonitorThreadInstance= NULL;
}
CStdinMonitorSingleton::CStdinMonitorSingleton(const CStdinMonitorSingleton&)
{
_StdinMonitorThreadHandle= NULL;
_StdinMonitorThreadInstance= NULL;
}
CStdinMonitorSingleton& CStdinMonitorSingleton::operator =(const CStdinMonitorSingleton&)
{
return *this;
}
} // NLNET