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AsyncChannel.cpp

//
// AsyncChannel.cpp
//
// $Id: //poco/1.3/Foundation/src/AsyncChannel.cpp#4 $
//
// Library: Foundation
// Package: Logging
// Module:  AsyncChannel
//
// Copyright (c) 2004-2007, 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/AsyncChannel.h"
#include "Poco/Notification.h"
#include "Poco/Message.h"
#include "Poco/Formatter.h"
#include "Poco/AutoPtr.h"
#include "Poco/LoggingRegistry.h"
#include "Poco/Exception.h"


namespace Poco {


class MessageNotification: public Notification
{
public:
      MessageNotification(const Message& msg)
      {
            _msg = msg;
      }
      
      ~MessageNotification()
      {
      }
      
      const Message& message() const
      {
            return _msg;
      }
      
private:
      Message _msg;
};


AsyncChannel::AsyncChannel(Channel* pChannel, Thread::Priority prio): 
      _pChannel(pChannel), 
      _thread("AsyncChannel")
{
      if (_pChannel) _pChannel->duplicate();
      _thread.setPriority(prio);
}


00080 AsyncChannel::~AsyncChannel()
{
      close();
      if (_pChannel) _pChannel->release();
}


00087 void AsyncChannel::setChannel(Channel* pChannel)
{
      FastMutex::ScopedLock lock(_mutex);
      
      if (_pChannel) _pChannel->release();
      _pChannel = pChannel;
      if (_pChannel) _pChannel->duplicate();
}


00097 Channel* AsyncChannel::getChannel() const
{
      return _pChannel;
}


00103 void AsyncChannel::open()
{
      FastMutex::ScopedLock lock(_mutex);

      if (!_thread.isRunning())
            _thread.start(*this);
}


00112 void AsyncChannel::close()
{
      if (_thread.isRunning())
      {
            while (!_queue.empty()) Thread::sleep(100);
            
            do 
            {
                  _queue.wakeUpAll(); 
            }
            while (!_thread.tryJoin(100));
      }
}


00127 void AsyncChannel::log(const Message& msg)
{
      open();

      _queue.enqueueNotification(new MessageNotification(msg));
}


00135 void AsyncChannel::setProperty(const std::string& name, const std::string& value)
{
      if (name == "channel")
            setChannel(LoggingRegistry::defaultRegistry().channelForName(value));
      else if (name == "priority")
            setPriority(value);
      else
            Channel::setProperty(name, value);
}


void AsyncChannel::run()
{
      AutoPtr<Notification> nf = _queue.waitDequeueNotification();
      while (nf)
      {
            MessageNotification* pNf = dynamic_cast<MessageNotification*>(nf.get());
            {
                  FastMutex::ScopedLock lock(_mutex);

                  if (pNf && _pChannel) _pChannel->log(pNf->message());
            }
            nf = _queue.waitDequeueNotification();
      }
}
            
            
void AsyncChannel::setPriority(const std::string& value)
{
      Thread::Priority prio = Thread::PRIO_NORMAL;
      
      if (value == "lowest")
            prio = Thread::PRIO_LOWEST;
      else if (value == "low")
            prio = Thread::PRIO_LOW;
      else if (value == "normal")
            prio = Thread::PRIO_NORMAL;
      else if (value == "high")
            prio = Thread::PRIO_HIGH;
      else if (value == "highest")
            prio = Thread::PRIO_HIGHEST;
      else
            throw InvalidArgumentException("thread priority", value);
            
      _thread.setPriority(prio);
}


} // namespace Poco

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