/*

 * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_LOGGING_LOGFILEOUTPUT_HPP

#define SHARE_VM_LOGGING_LOGFILEOUTPUT_HPP

#include "logging/logFileStreamOutput.hpp"

#include "runtime/semaphore.hpp"

#include "utilities/globalDefinitions.hpp"

class LogDecorations;

// The log file output, with support for file rotation based on a target size.

class LogFileOutput : public LogFileStreamOutput {

 private:

  static const char* const FileOpenMode;

  static const char* const FileCountOptionKey;

  static const char* const FileSizeOptionKey;

  static const char* const PidFilenamePlaceholder;

  static const char* const TimestampFilenamePlaceholder;

  static const char* const TimestampFormat;

  static const size_t DefaultFileCount = 5;

  static const size_t DefaultFileSize = 20 * M;

  static const size_t StartTimeBufferSize = 20;

  static const size_t PidBufferSize = 21;

  static const uint   MaxRotationFileCount = 1000;

  static char         _pid_str[PidBufferSize];

  static char         _vm_start_time_str[StartTimeBufferSize];

  const char* _name;

  char* _file_name;

  char* _archive_name;

  uint  _current_file;

  uint  _file_count;

  uint  _file_count_max_digits;

  size_t  _archive_name_len;

  size_t  _rotate_size;

  size_t  _current_size;

  // Semaphore used for synchronizing file rotations and writes

  Semaphore _rotation_semaphore;

  void archive();

  void rotate();

  bool parse_options(const char* options, outputStream* errstream);

  char *make_file_name(const char* file_name, const char* pid_string, const char* timestamp_string);

  bool should_rotate() {

    return _file_count > 0 && _rotate_size > 0 && _current_size >= _rotate_size;

  }

  void increment_file_count() {

    _current_file++;

    if (_current_file == _file_count) {

      _current_file = 0;

    }

  }

 public:

  LogFileOutput(const char *name);

  virtual ~LogFileOutput();

  virtual bool initialize(const char* options, outputStream* errstream);

  virtual int write(const LogDecorations& decorations, const char* msg);

  virtual int write(LogMessageBuffer::Iterator msg_iterator);

  virtual void force_rotate();

  virtual void describe(outputStream *out);

  virtual const char* name() const {

    return _name;

  }

  static const char* const Prefix;

  static void set_file_name_parameters(jlong start_time);

};

#endif // SHARE_VM_LOGGING_LOGFILEOUTPUT_HPP