filechannel.cpp

很好用的网络封装库,不熟悉网络编程的人也可以使用。使用风格良好的标准c++编写。

//
// FileChannel.cpp
//
// $Id: //poco/1.3/Foundation/src/FileChannel.cpp#2 $
//
// Library: Foundation
// Package: Logging
// Module:  FileChannel
//
// Copyright (c) 2004-2006, 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/FileChannel.h"
#include "Poco/ArchiveStrategy.h"
#include "Poco/RotateStrategy.h"
#include "Poco/PurgeStrategy.h"
#include "Poco/Message.h"
#include "Poco/NumberParser.h"
#include "Poco/DateTimeFormatter.h"
#include "Poco/DateTime.h"
#include "Poco/LocalDateTime.h"
#include "Poco/String.h"
#include "Poco/Timespan.h"
#include "Poco/Exception.h"
#include <cctype>


namespace Poco {


const std::string FileChannel::PROP_PATH       = "path";
const std::string FileChannel::PROP_ROTATION   = "rotation";
const std::string FileChannel::PROP_ARCHIVE    = "archive";
const std::string FileChannel::PROP_TIMES      = "times";
const std::string FileChannel::PROP_COMPRESS   = "compress";
const std::string FileChannel::PROP_PURGEAGE   = "purgeAge";
const std::string FileChannel::PROP_PURGECOUNT = "purgeCount";


FileChannel::FileChannel(): 
	_times("utc"),
	_compress(false),
	_pFile(0),
	_pRotateStrategy(0),
	_pArchiveStrategy(new ArchiveByNumberStrategy),
	_pPurgeStrategy(0)
{
}


FileChannel::FileChannel(const std::string& path):
	_path(path),
	_times("utc"),
	_compress(false),
	_pFile(0),
	_pRotateStrategy(0),
	_pArchiveStrategy(new ArchiveByNumberStrategy),
	_pPurgeStrategy(0)
{
}


FileChannel::~FileChannel()
{
	close();
	delete _pRotateStrategy;
	delete _pArchiveStrategy;
	delete _pPurgeStrategy;
}


void FileChannel::open()
{
	FastMutex::ScopedLock lock(_mutex);
	
	if (!_pFile)
	{
		_pFile = new LogFile(_path);
	}
}


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

	delete _pFile;
	_pFile = 0;
}


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

	FastMutex::ScopedLock lock(_mutex);

	if (_pRotateStrategy && _pArchiveStrategy && _pRotateStrategy->mustRotate(_pFile))
	{
		try
		{
			_pFile = _pArchiveStrategy->archive(_pFile);
			purge();
		}
		catch (...)
		{
			_pFile = new LogFile(_path);
		}
	}
	_pFile->write(msg.getText());
}

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

	if (name == PROP_TIMES)
	{
		_times = value;

		if (!_rotation.empty())
			setRotation(_rotation);

		if (!_archive.empty())
			setArchive(_archive);
	}
	else if (name == PROP_PATH)
		_path = value;
	else if (name == PROP_ROTATION)
		setRotation(value);
	else if (name == PROP_ARCHIVE)
		setArchive(value);
	else if (name == PROP_COMPRESS)
		setCompress(value);
	else if (name == PROP_PURGEAGE)
		setPurgeAge(value);
	else if (name == PROP_PURGECOUNT)
		setPurgeCount(value);
	else
		Channel::setProperty(name, value);
}


std::string FileChannel::getProperty(const std::string& name) const
{
	if (name == PROP_TIMES)
		return _times;
	else if (name == PROP_PATH)
		return _path;
	else if (name == PROP_ROTATION)
		return _rotation;
	else if (name == PROP_ARCHIVE)
		return _archive;
	else if (name == PROP_COMPRESS)
		return std::string(_compress ? "true" : "false");
	else if (name == PROP_PURGEAGE)
		return _purgeAge;
	else if (name == PROP_PURGECOUNT)
		return _purgeCount;
	else
		return Channel::getProperty(name);
}


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

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


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


void FileChannel::setRotation(const std::string& rotation)
{
	std::string::const_iterator it  = rotation.begin();
	std::string::const_iterator end = rotation.end();
	int 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++;
	
	RotateStrategy* pStrategy = 0;
	if ((rotation.find(',') != std::string::npos) || (rotation.find(':') != std::string::npos))
	{
		if (_times == "utc")
			pStrategy = new RotateAtTimeStrategy<DateTime>(rotation);
		else if (_times == "local")
			pStrategy = new RotateAtTimeStrategy<LocalDateTime>(rotation);
		else
			throw PropertyNotSupportedException("times", _times);
	}
	else if (unit == "daily")
		pStrategy = new RotateByIntervalStrategy(Timespan(1*Timespan::DAYS));
	else if (unit == "weekly")
		pStrategy = new RotateByIntervalStrategy(Timespan(7*Timespan::DAYS));
	else if (unit == "monthly")
		pStrategy = new RotateByIntervalStrategy(Timespan(30*Timespan::DAYS));
	else if (unit == "seconds") // for testing only
		pStrategy = new RotateByIntervalStrategy(Timespan(n*Timespan::SECONDS));
	else if (unit == "hours")
		pStrategy = new RotateByIntervalStrategy(Timespan(n*Timespan::HOURS));
	else if (unit == "days")
		pStrategy = new RotateByIntervalStrategy(Timespan(n*Timespan::DAYS));
	else if (unit == "weeks")
		pStrategy = new RotateByIntervalStrategy(Timespan(n*7*Timespan::DAYS));
	else if (unit == "months")
		pStrategy = new RotateByIntervalStrategy(Timespan(n*30*Timespan::DAYS));
	else if (unit == "K")
		pStrategy = new RotateBySizeStrategy(n*1024);
	else if (unit == "M")
		pStrategy = new RotateBySizeStrategy(n*1024*1024);
	else if (unit.empty())
		pStrategy = new RotateBySizeStrategy(n);
	else if (unit != "never")
		throw InvalidArgumentException("rotation", rotation);
	delete _pRotateStrategy;
	_pRotateStrategy = pStrategy;
	_rotation = rotation;
}


void FileChannel::setArchive(const std::string& archive)
{
	ArchiveStrategy* pStrategy = 0;
	if (archive == "number")
	{
		pStrategy = new ArchiveByNumberStrategy;
	}
	else if (archive == "timestamp")
	{
		if (_times == "utc")
			pStrategy = new ArchiveByTimestampStrategy<DateTime>;
		else if (_times == "local")
			pStrategy = new ArchiveByTimestampStrategy<LocalDateTime>;
		else
			throw PropertyNotSupportedException("times", _times);
	}
	else throw InvalidArgumentException("archive", archive);
	delete _pArchiveStrategy;
	pStrategy->compress(_compress);
	_pArchiveStrategy = pStrategy;
	_archive = archive;
}


void FileChannel::setCompress(const std::string& compress)
{
	_compress = icompare(compress, "true") == 0;
	if (_pArchiveStrategy)
		_pArchiveStrategy->compress(_compress);
}


void FileChannel::setPurgeAge(const std::string& age)
{
	std::string::const_iterator it  = age.begin();
	std::string::const_iterator end = age.end();
	int 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++;
	
	Timespan::TimeDiff factor = Timespan::SECONDS;
	if (unit == "minutes")
		factor = Timespan::MINUTES;
	else if (unit == "hours")
		factor = Timespan::HOURS;
	else if (unit == "days")
		factor = Timespan::DAYS;
	else if (unit == "weeks")
		factor = 7*Timespan::DAYS;
	else if (unit == "months")
		factor = 30*Timespan::DAYS;
	else if (unit != "seconds")
		throw InvalidArgumentException("purgeAge", age);
		
	delete _pPurgeStrategy;
	_pPurgeStrategy = new PurgeByAgeStrategy(Timespan(factor*n));
	_purgeAge = age;
}


void FileChannel::setPurgeCount(const std::string& count)
{
	std::string::const_iterator it  = count.begin();
	std::string::const_iterator end = count.end();
	int 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;

	delete _pPurgeStrategy;
	_pPurgeStrategy = new PurgeByCountStrategy(n);
	_purgeCount = count;
}


void FileChannel::purge()
{
	if (_pPurgeStrategy)
	{
		try
		{
			_pPurgeStrategy->purge(_path);
		}
		catch (...)
		{
		}
	}
}


} // namespace Poco