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//
// PurgeStrategy.h
//
// Library: Foundation
// Package: Logging
// Module: FileChannel
//
// Definition of the PurgeStrategy class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_PurgeStrategy_INCLUDED
#define Foundation_PurgeStrategy_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/File.h"
#include "Poco/Timespan.h"
#include <vector>
namespace Poco {
class Foundation_API PurgeStrategy
/// The PurgeStrategy is used by FileChannel
/// to purge archived log files.
{
public:
PurgeStrategy();
virtual ~PurgeStrategy();
virtual void purge(const std::string& path) = 0;
/// Purges archived log files. The path to the
/// current "hot" log file is given.
/// To find archived log files, look for files
/// with a name consisting of the given path
/// plus any suffix (e.g., .1, .20050929081500, .1.gz).
/// A list of archived files can be obtained by calling
/// the list() method.
protected:
void list(const std::string& path, std::vector<File>& files);
/// Fills the given vector with a list of archived log
/// files. The path of the current "hot" log file is
/// given in path.
///
/// All files with the same name as the one given in path,
/// plus some suffix (e.g., .1, .20050929081500, .1.gz) are
/// considered archived files.
private:
PurgeStrategy(const PurgeStrategy&);
PurgeStrategy& operator = (const PurgeStrategy&);
};
class Foundation_API PurgeByAgeStrategy: public PurgeStrategy
/// This purge strategy purges all files that have
/// exceeded a given age (given in seconds).
{
public:
PurgeByAgeStrategy(const Timespan& age);
~PurgeByAgeStrategy();
void purge(const std::string& path);
private:
Timespan _age;
};
class Foundation_API PurgeByCountStrategy: public PurgeStrategy
/// This purge strategy ensures that a maximum number
/// of archived files is not exceeded. Files are deleted
/// based on their age, with oldest files deleted first.
{
public:
PurgeByCountStrategy(int count);
~PurgeByCountStrategy();
void purge(const std::string& path);
private:
int _count;
};
class Foundation_API PurgeOneFileStrategy: public PurgeStrategy
/// This purge strategy unconditionally purges one oldest file.
/// If there are no archived files, it will truncate current "hot" log file.
/// Intended usage: when there are no space left on device with logs.
{
public:
void purge(const std::string& path);
};
} // namespace Poco
#endif // Foundation_PurgeStrategy_INCLUDED
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