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TCPServerDispatcher.cpp

//
// TCPServerDispatcher.cpp
//
// $Id: //poco/1.2/Net/src/TCPServerDispatcher.cpp#1 $
//
// Library: Net
// Package: TCPServer
// Module:  TCPServerDispatcher
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Net/TCPServerDispatcher.h"
#include "Poco/Net/TCPServerConnectionFactory.h"
#include "Poco/Net/TCPServerParams.h"
#include "Poco/Notification.h"
#include "Poco/AutoPtr.h"
#include <memory>


using Poco::Notification;
using Poco::FastMutex;
using Poco::AutoPtr;


namespace Poco {
namespace Net {


class TCPConnectionNotification: public Notification
{
public:
      TCPConnectionNotification(const StreamSocket& socket):
            _socket(socket)
      {
      }
      
      ~TCPConnectionNotification()
      {
      }
      
      const StreamSocket& socket() const
      {
            return _socket;
      }

private:
      StreamSocket _socket;
};


TCPServerDispatcher::TCPServerDispatcher(TCPServerConnectionFactory* pFactory, Poco::ThreadPool& threadPool, TCPServerParams* pParams):
      _rc(1),
      _pParams(pParams),
      _currentThreads(0),
      _totalConnections(0),
      _currentConnections(0),
      _maxConcurrentConnections(0),
      _refusedConnections(0),
      _stopped(false),
      _pConnectionFactory(pFactory),
      _threadPool(threadPool)
{
      poco_check_ptr (pFactory);

      if (!_pParams)
            _pParams = new TCPServerParams;
      
      if (_pParams->getMaxThreads() == 0)
            _pParams->setMaxThreads(threadPool.capacity());
}


00098 TCPServerDispatcher::~TCPServerDispatcher()
{
      _pParams->release();
      delete _pConnectionFactory;
}


00105 void TCPServerDispatcher::duplicate()
{
      _mutex.lock();
      ++_rc;
      _mutex.unlock();
}


00113 void TCPServerDispatcher::release()
{
      _mutex.lock();
      int rc = --_rc;
      _mutex.unlock();
      if (rc == 0) delete this;
}


00122 void TCPServerDispatcher::run()
{
      AutoPtr<TCPServerDispatcher> guard(this, true); // ensure object stays alive

      int idleTime = (int) _pParams->getThreadIdleTime().totalMilliseconds();

      for (;;)
      {
            AutoPtr<Notification> pNf = _queue.waitDequeueNotification(idleTime);
            if (pNf)
            {
                  TCPConnectionNotification* pCNf = dynamic_cast<TCPConnectionNotification*>(pNf.get());
                  if (pCNf)
                  {
                        std::auto_ptr<TCPServerConnection> pConnection(_pConnectionFactory->createConnection(pCNf->socket()));
                        poco_check_ptr(pConnection.get());
                        beginConnection();
                        pConnection->start();
                        endConnection();
                  }
            }
      
            FastMutex::ScopedLock lock(_mutex);
            if (_stopped || _currentThreads > 1 && _queue.empty())
            {
                  --_currentThreads;
                  break;
            }
      }
}

      
00154 void TCPServerDispatcher::enqueue(const StreamSocket& socket)
{
      FastMutex::ScopedLock lock(_mutex);

      if (_queue.size() < _pParams->getMaxQueued())
      {
            _queue.enqueueNotification(new TCPConnectionNotification(socket));
            if (!_queue.hasIdleThreads() && _currentThreads < _pParams->getMaxThreads())
            {
                  try
                  {
                        static const std::string threadName("TCPServerConnection");
                        _threadPool.start(*this, threadName);
                        ++_currentThreads;
                  }
                  catch (Poco::Exception&)
                  {
                        // no problem here, connection is already queued
                        // and a new thread might be available later.
                  }
            }
      }
      else
      {
            ++_refusedConnections;
      }
}


00183 void TCPServerDispatcher::stop()
{
      _stopped = true;
      _queue.clear();
      _queue.wakeUpAll();
}


00191 int TCPServerDispatcher::currentThreads() const
{
      FastMutex::ScopedLock lock(_mutex);
      
      return _currentThreads;
}


00199 int TCPServerDispatcher::totalConnections() const
{
      FastMutex::ScopedLock lock(_mutex);
      
      return _totalConnections;
}


00207 int TCPServerDispatcher::currentConnections() const
{
      FastMutex::ScopedLock lock(_mutex);
      
      return _currentConnections;
}


00215 int TCPServerDispatcher::maxConcurrentConnections() const
{
      FastMutex::ScopedLock lock(_mutex);
      
      return _maxConcurrentConnections;
}


00223 int TCPServerDispatcher::queuedConnections() const
{
      return _queue.size();
}


00229 int TCPServerDispatcher::refusedConnections() const
{
      FastMutex::ScopedLock lock(_mutex);
      
      return _refusedConnections;
}


00237 void TCPServerDispatcher::beginConnection()
{
      FastMutex::ScopedLock lock(_mutex);
      
      ++_totalConnections;
      ++_currentConnections;
      if (_currentConnections > _maxConcurrentConnections)
            _maxConcurrentConnections = _currentConnections;
}


00248 void TCPServerDispatcher::endConnection()
{
      FastMutex::ScopedLock lock(_mutex);

      --_currentConnections;
}


} } // namespace Poco::Net

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