source: XMLIO_V2/external/src/POCO/Foundation/AsyncChannel.cpp @ 80

//
// 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);
}


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


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


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


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

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


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


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

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


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