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SocketReactor.cpp

//
// SocketReactor.cpp
//
// $Id: //poco/1.2/Net/src/SocketReactor.cpp#1 $
//
// Library: Net
// Package: Reactor
// Module:  SocketReactor
//
// 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/SocketReactor.h"
#include "Poco/Net/SocketNotification.h"
#include "Poco/Net/SocketNotifier.h"
#include "Poco/ErrorHandler.h"
#include "Poco/Exception.h"


using Poco::FastMutex;
using Poco::Exception;
using Poco::ErrorHandler;


namespace Poco {
namespace Net {


SocketReactor::SocketReactor():
      _stop(false),
      _timeout(DEFAULT_TIMEOUT),
      _pReadableNotification(new ReadableNotification(this)),
      _pWritableNotification(new WritableNotification(this)),
      _pErrorNotification(new ErrorNotification(this)),
      _pTimeoutNotification(new TimeoutNotification(this)),
      _pShutdownNotification(new ShutdownNotification(this))
{
}


00065 SocketReactor::SocketReactor(const Poco::Timespan& timeout):
      _stop(false),
      _timeout(timeout),
      _pReadableNotification(new ReadableNotification(this)),
      _pWritableNotification(new WritableNotification(this)),
      _pErrorNotification(new ErrorNotification(this)),
      _pTimeoutNotification(new TimeoutNotification(this)),
      _pShutdownNotification(new ShutdownNotification(this))
{
}


00077 SocketReactor::~SocketReactor()
{
}


00082 void SocketReactor::run()
{
      Socket::SocketList readable;
      Socket::SocketList writable;
      Socket::SocketList except;
      
      while (!_stop)
      {
            readable.clear();
            writable.clear();
            except.clear();
            {
                  FastMutex::ScopedLock lock(_mutex);
                  for (EventHandlerMap::iterator it = _handlers.begin(); it != _handlers.end(); ++it)
                  {
                        if (it->second->accepts(_pReadableNotification))
                              readable.push_back(it->first);
                        if (it->second->accepts(_pWritableNotification))
                              writable.push_back(it->first);
                        if (it->second->accepts(_pErrorNotification))
                              except.push_back(it->first);
                  }
            }
            if (Socket::select(readable, writable, except, _timeout))
            {
                  for (Socket::SocketList::iterator it = readable.begin(); it != readable.end(); ++it)
                        dispatch(*it, _pReadableNotification);
                  for (Socket::SocketList::iterator it = writable.begin(); it != writable.end(); ++it)
                        dispatch(*it, _pWritableNotification);
                  for (Socket::SocketList::iterator it = except.begin(); it != except.end(); ++it)
                        dispatch(*it, _pErrorNotification);
            }
            else onTimeout();
      }
      onShutdown();
}

      
00120 void SocketReactor::stop()
{
      _stop = true;
}


00126 void SocketReactor::setTimeout(const Poco::Timespan& timeout)
{
      _timeout = timeout;
}

      
00132 const Poco::Timespan& SocketReactor::getTimeout() const
{
      return _timeout;
}


00138 void SocketReactor::addEventHandler(const Socket& socket, const Poco::AbstractObserver& observer)
{
      FastMutex::ScopedLock lock(_mutex);
      
      NotifierPtr pNotifier;
      EventHandlerMap::iterator it = _handlers.find(socket);
      if (it == _handlers.end())
      {
            pNotifier = new SocketNotifier(socket);
            _handlers[socket] = pNotifier;
      }
      else pNotifier = it->second;
      pNotifier->addObserver(this, observer);
}


00154 void SocketReactor::removeEventHandler(const Socket& socket, const Poco::AbstractObserver& observer)
{
      FastMutex::ScopedLock lock(_mutex);
      
      EventHandlerMap::iterator it = _handlers.find(socket);
      if (it != _handlers.end())
      {
            NotifierPtr pNotifier = it->second;
            pNotifier->removeObserver(this, observer);
            if (!pNotifier->hasObservers())
                  _handlers.erase(it);
      }
}


00169 void SocketReactor::onTimeout()
{
      dispatch(_pTimeoutNotification);
}


00175 void SocketReactor::onShutdown()
{
      dispatch(_pShutdownNotification);
}


00181 void SocketReactor::dispatch(const Socket& socket, SocketNotification* pNotification)
{
      NotifierPtr pNotifier;
      {
            FastMutex::ScopedLock lock(_mutex);
            EventHandlerMap::iterator it = _handlers.find(socket);
            if (it != _handlers.end())
                  pNotifier = it->second;
            else
                  return;
      }
      dispatch(pNotifier, pNotification);
}


00196 void SocketReactor::dispatch(SocketNotification* pNotification)
{
      std::vector<NotifierPtr> delegates;
      delegates.reserve(_handlers.size());
      {
            FastMutex::ScopedLock lock(_mutex);
            for (EventHandlerMap::iterator it = _handlers.begin(); it != _handlers.end(); ++it)
                  delegates.push_back(it->second);
      }
      for (std::vector<NotifierPtr>::iterator it = delegates.begin(); it != delegates.end(); ++it)
      {
            dispatch(*it, pNotification);
      }
}


void SocketReactor::dispatch(NotifierPtr& pNotifier, SocketNotification* pNotification)
{
      try
      {
            pNotifier->dispatch(pNotification);
      }
      catch (Exception& exc)
      {
            ErrorHandler::handle(exc);
      }
      catch (std::exception& exc)
      {
            ErrorHandler::handle(exc);
      }
      catch (...)
      {
            ErrorHandler::handle();
      }
}


} } // namespace Poco::Net

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