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SimpleFileChannel.h

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


#ifndef Foundation_SimpleFileChannel_INCLUDED
#define Foundation_SimpleFileChannel_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Channel.h"
#include "Poco/Timestamp.h"
#include "Poco/Mutex.h"


namespace Poco {


class LogFile;


00055 class Foundation_API SimpleFileChannel: public Channel
      /// A Channel that writes to a file. This class only
      /// supports simple log file rotation.
      ///
      /// For more features, see the FileChannel class.
      ///
      /// Only the message's text is written, followed
      /// by a newline.
      ///
      /// Chain this channel to a FormattingChannel with an
      /// appropriate Formatter to control what is in the text. 
      ///
      /// Log file rotation based on log file size is supported.
      ///
      /// If rotation is enabled, the SimpleFileChannel will 
      /// alternate between two log files. If the size of
      /// the primary log file exceeds a specified limit,
      /// the secondary log file will be used, and vice
      /// versa. 
      ///
      /// Log rotation is configured with the "rotation"
      /// property, which supports the following values:
      ///   * never:         no log rotation
      ///   * <n>:           the file is rotated when its size exceeds
      ///                    <n> bytes.
      ///   * <n> K:         the file is rotated when its size exceeds
      ///                    <n> Kilobytes.
      ///   * <n> M:         the file is rotated when its size exceeds
      ///                    <n> Megabytes.
      ///
      /// The path of the (primary) log file can be specified with
      /// the "path" property. Optionally, the path of the secondary
      /// log file can be specified with the "secondaryPath" property.
      ///
      /// If no secondary path is specified, the secondary path will
      /// default to <primaryPath>.1.
{
public:
      SimpleFileChannel();
            /// Creates the FileChannel.

      SimpleFileChannel(const std::string& path);
            /// Creates the FileChannel for a file with the given path.

      void open();
            /// Opens the FileChannel and creates the log file if necessary.
            
      void close();
            /// Closes the FileChannel.

      void log(const Message& msg);
            /// Logs the given message to the file.
            
      void setProperty(const std::string& name, const std::string& value);
            /// Sets the property with the given name. 
            /// 
            /// The following properties are supported:
            ///   * path:          The primary log file's path.
            ///   * secondaryPath: The secondary log file's path.
            ///   * rotation:      The log file's rotation mode. See the 
            ///                    SimpleFileChannel class for details.

      std::string getProperty(const std::string& name) const;
            /// Returns the value of the property with the given name.
            /// See setProperty() for a description of the supported
            /// properties.

      Timestamp creationDate() const;
            /// Returns the log file's creation date.
            
      UInt64 size() const;
            /// Returns the log file's current size in bytes.

      const std::string& path() const;
            /// Returns the log file's primary path.

      const std::string& secondaryPath() const;
            /// Returns the log file's secondary path.

00134       static const std::string PROP_PATH;
      static const std::string PROP_SECONDARYPATH;
      static const std::string PROP_ROTATION;

protected:
      ~SimpleFileChannel();
      void setRotation(const std::string& rotation);
      void rotate();

private:
      std::string      _path;
      std::string      _secondaryPath;
      std::string      _rotation;
      UInt64           _limit;
      LogFile*         _pFile;
      FastMutex        _mutex;
};


} // namespace Poco


#endif // Foundation_SimpleFileChannel_INCLUDED

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