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

//
// SimpleFileChannel.cpp
//
// $Id: //poco/1.3/Foundation/src/SimpleFileChannel.cpp#2 $
//
// Library: Foundation
// Package: Logging
// Module:  SimpleFileChannel
//
// 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/SimpleFileChannel.h"
#include "Poco/LogFile.h"
#include "Poco/File.h"
#include "Poco/Message.h"
#include "Poco/Exception.h"
#include <cctype>


namespace Poco {


const std::string SimpleFileChannel::PROP_PATH          = "path";
const std::string SimpleFileChannel::PROP_SECONDARYPATH = "secondaryPath";
const std::string SimpleFileChannel::PROP_ROTATION      = "rotation";


SimpleFileChannel::SimpleFileChannel(): 
        _limit(0),
        _pFile(0)
{
}


SimpleFileChannel::SimpleFileChannel(const std::string& path):
        _path(path),
        _secondaryPath(path + ".0"),
        _limit(0),
        _pFile(0)
{
}


SimpleFileChannel::~SimpleFileChannel()
{
        close();
}


void SimpleFileChannel::open()
{
        FastMutex::ScopedLock lock(_mutex);
        
        if (!_pFile)
        {
                File primary(_path);
                File secondary(_secondaryPath);
                Timestamp pt = primary.exists() ? primary.getLastModified() : 0;
                Timestamp st = secondary.exists() ? secondary.getLastModified() : 0;
                std::string path;
                if (pt >= st)
                        path = _path;
                else
                        path = _secondaryPath;
                _pFile = new LogFile(path);
        }
}


void SimpleFileChannel::close()
{
        FastMutex::ScopedLock lock(_mutex);

        delete _pFile;
        _pFile = 0;
}


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

        FastMutex::ScopedLock lock(_mutex);

        if (_limit > 0 && _pFile->size() >= _limit)
        {
                rotate();
        }
        _pFile->write(msg.getText());
}

        
void SimpleFileChannel::setProperty(const std::string& name, const std::string& value)
{
        FastMutex::ScopedLock lock(_mutex);

        if (name == PROP_PATH)
        {
                _path = value;
                if (_secondaryPath.empty())
                        _secondaryPath = _path + ".0";
        }
        else if (name == PROP_SECONDARYPATH)
                _secondaryPath = value;
        else if (name == PROP_ROTATION)
                setRotation(value);
        else
                Channel::setProperty(name, value);
}


std::string SimpleFileChannel::getProperty(const std::string& name) const
{
        if (name == PROP_PATH)
                return _path;
        else if (name == PROP_SECONDARYPATH)
                return _secondaryPath;
        else if (name == PROP_ROTATION)
                return _rotation;
        else
                return Channel::getProperty(name);
}


Timestamp SimpleFileChannel::creationDate() const
{
        if (_pFile)
                return _pFile->creationDate();
        else
                return 0;
}

        
UInt64 SimpleFileChannel::size() const
{
        if (_pFile)
                return _pFile->size();
        else
                return 0;
}


const std::string& SimpleFileChannel::path() const
{
        return _path;
}


const std::string& SimpleFileChannel::secondaryPath() const
{
        return _secondaryPath;
}


void SimpleFileChannel::setRotation(const std::string& rotation)
{
        std::string::const_iterator it  = rotation.begin();
        std::string::const_iterator end = rotation.end();
        UInt64 n = 0;
        while (it != end && std::isspace(*it)) ++it;
        while (it != end && std::isdigit(*it)) { n *= 10; n += *it++ - '0'; }
        while (it != end && std::isspace(*it)) ++it;
        std::string unit;
        while (it != end && std::isalpha(*it)) unit += *it++;
        
        if (unit == "K")
                _limit = n*1024;
        else if (unit == "M")
                _limit = n*1024*1024;
        else if (unit.empty())
                _limit = n;
        else if (unit == "never")
                _limit = 0;
        else
                throw InvalidArgumentException("rotation", rotation);
        _rotation = rotation;
}


void SimpleFileChannel::rotate()
{
        std::string newPath;
        if (_pFile->path() == _path)
                newPath = _secondaryPath;
        else
                newPath = _path;
        File f(newPath);
        if (f.exists())
        {
                try
                {
                        f.remove();
                }
                catch (...)
                {
                }
        }
        delete _pFile;
        _pFile = new LogFile(newPath);
}


} // namespace Poco