text: /*
   *   BSD LICENSE
   *   Copyright (c) 2021 Samsung Electronics Corporation
   *   All rights reserved.
   *
   *   Redistribution and use in source and binary forms, with or without
   *   modification, are permitted provided that the following conditions
   *   are met:
   *
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in
   *       the documentation and/or other materials provided with the
   *       distribution.
   *     * Neither the name of Samsung Electronics Corporation nor the names of
   *       its contributors may be used to endorse or promote products derived
   *       from this software without specific prior written permission.
   *
   *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include <vector>
  #include <mutex>
  
  #include "log_group_buffer_status.h"
  #include "src/journal_manager/log_buffer/buffer_write_done_notifier.h"
  #include "src/journal_manager/status/i_log_buffer_status.h"
  
  namespace pos
  {
  class JournalConfiguration;
  class LogGroupReleaser;
  
  class BufferOffsetAllocator : public LogBufferWriteDoneEvent, public ILogBufferStatus
  {
  public:
      BufferOffsetAllocator(void);
      virtual ~BufferOffsetAllocator(void);
  
      virtual void Init(LogGroupReleaser* releaser, JournalConfiguration* journalConfiguration);
      // For UT
      void Init(LogGroupReleaser* logGroupReleaser,
          JournalConfiguration* journalConfiguration, std::vector<LogGroupBufferStatus*> LogBufferstatusList);
  
      virtual void Dispose(void);
  
      void Reset(void);
  
      virtual int AllocateBuffer(uint32_t logSize, uint64_t& allocatedOffset);
      virtual void LogWriteCanceled(int logGroupId);
  
      virtual void LogFilled(int logGroupId, MapPageList& dirty) override;
      virtual void LogBufferReseted(int logGroupId) override;
  
      uint64_t GetNumLogsAdded(void);
      uint64_t GetNextOffset(void);
  
      virtual LogGroupStatus GetBufferStatus(int logGroupId) override;
      virtual uint32_t GetSequenceNumber(int logGroupId) override;
  
      virtual int GetLogGroupId(uint64_t fileOffset);
  
  private:
      int _GetNewActiveGroup(void);
      uint32_t _GetNextSeqNum(void);
      void _TryToSetFull(int logGroupId);
  
      JournalConfiguration* config;
      LogGroupReleaser* releaser;
  
      std::mutex allocateLock;
      std::vector<LogGroupBufferStatus*> statusList;
  
      uint32_t nextSeqNumber;
      int currentLogGroupId;
  };
  } // namespace pos
  