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PurgeStrategy.h

//
// PurgeStrategy.h
//
// $Id: //poco/1.3/Foundation/include/Poco/PurgeStrategy.h#1 $
//
// Library: Foundation
// Package: Logging
// Module:  FileChannel
//
// Definition of the PurgeStrategy class.
//
// 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.
//


#ifndef Foundation_PurgeStrategy_INCLUDED
#define Foundation_PurgeStrategy_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/File.h"
#include "Poco/Timespan.h"
#include <vector>


namespace Poco {


00052 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&);
};


00085 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;
};


00100 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;
};


} // namespace Poco


#endif // Foundation_PurgeStrategy_INCLUDED

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