/* Copyright (C) 2014 InfiniDB, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   This program 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 for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

#pragma once

/***************************************************************************
 *
 *   $Id: blockrequestprocessor.h 2055 2013-02-08 19:09:09Z pleblanc $
 *
 *   jrodriguez@calpont.com   *
 *                                                                         *
 ***************************************************************************/

#include <boost/thread.hpp>

#include "blocksize.h"
#include "fileblockrequestqueue.h"
#include "filebuffermgr.h"
#include "iomanager.h"
#include <cstdint>

/**
        @author Jason Rodriguez <jrodriguez@calpont.com>
*/

namespace dbbc
{
typedef std::list<FileBuffer> FileBufferList_t;

/**
 * @brief class to control the populating of the Disk Block Buffer Cache and manage Block requests.
 **/

class BlockRequestProcessor
{
 public:
  /**
   * @brief default ctor
   **/
  BlockRequestProcessor(uint32_t numBlcks, int thrCount, int blocksPerRead, uint32_t deleteBlocks = 0,
                        uint32_t blckSz = BLOCK_SIZE);

  /**
   * @brief default dtor
   **/
  virtual ~BlockRequestProcessor();

  /**
   * @brief send a request for disk blocks to the IO manager
   **/
  int sendRequest(fileRequest& blk)
  {
    return fBRPRequestQueue.push(blk);
  }

  /**
   * @brief verify that the lbid@ver disk block is in the block cache. Send request if it is not
   **/
  int check(BRM::LBID_t lbid, const BRM::QueryContext& ver, BRM::VER_t txn, bool flg, int compType,
            bool& wasBlockInCache);

  /**
   * @brief verify the LBIDRange of disk blocks is in the block cache. Send request if it is not
   **/
  int check(const BRM::InlineLBIDRange& range, const BRM::QueryContext& ver, const BRM::VER_t txn,
            const int compType, uint32_t& lbidCount);

  /**
   * @brief retrieve the lbid@ver disk block from the block cache
   **/
  inline FileBuffer* getBlockPtr(const BRM::LBID_t lbid, const BRM::VER_t ver, bool flg)
  {
    return fbMgr.findPtr(HashObject_t(lbid, ver, flg));
  }

  inline int read(const BRM::LBID_t& lbid, const BRM::VER_t& ver, FileBuffer& fb)
  {
    return (fbMgr.find(HashObject_t(lbid, ver, 0), fb) ? 1 : 0);
  }

  /**
   * @brief retrieve the lbid@ver disk block from the block cache
   **/
  inline int read(const BRM::LBID_t& lbid, const BRM::VER_t& ver, void* bufferPtr)
  {
    return (fbMgr.find(HashObject_t(lbid, ver, 0), bufferPtr) ? 1 : 0);
  }

  int getBlock(const BRM::LBID_t& lbid, const BRM::QueryContext& ver, BRM::VER_t txn, int compType,
               void* bufferPtr, bool flg, bool& wasCached, bool* wasVersioned, bool insertIntoCache,
               bool readFromCache);

  int getCachedBlocks(const BRM::LBID_t* lbids, const BRM::VER_t* vers, uint8_t** ptrs, bool* wasCached,
                      uint32_t count);

  inline bool exists(BRM::LBID_t lbid, BRM::VER_t ver)
  {
    return fbMgr.exists(HashObject_t(lbid, ver, 0));
  }

  /**
   * @brief
   **/
  void flushCache()
  {
    fbMgr.flushCache();
  }

  /**
   * @brief
   **/
  void flushOne(BRM::LBID_t lbid, BRM::VER_t ver)
  {
    fbMgr.flushOne(lbid, ver);
  }

  void flushMany(const LbidAtVer* laVptr, uint32_t cnt)
  {
    fbMgr.flushMany(laVptr, cnt);
  }

  void flushManyAllversion(const BRM::LBID_t* laVptr, uint32_t cnt)
  {
    fbMgr.flushManyAllversion(laVptr, cnt);
  }

  void flushOIDs(const uint32_t* oids, uint32_t count)
  {
    fbMgr.flushOIDs(oids, count);
  }

  void flushPartition(const std::vector<BRM::OID_t>& oids, const std::set<BRM::LogicalPartition>& partitions)
  {
    fbMgr.flushPartition(oids, partitions);
  }

  void setReportingFrequency(const uint32_t d)
  {
    fbMgr.setReportingFrequency(d);
  }

  uint32_t ReportingFrequency() const
  {
    return fbMgr.ReportingFrequency();
  }

  std::ostream& formatLRUList(std::ostream& os) const
  {
    return fbMgr.formatLRUList(os);
  }

 private:
  FileBufferMgr fbMgr;
  fileBlockRequestQueue fBRPRequestQueue;
  ioManager fIOMgr;
  boost::mutex check_mutex;

  /**
   * helper function for public check functions
   **/
  int check(fileRequest& rqstBlk);

  /**
   * send stop requests for IOmanager and request Q
   **/
  void stop();

  std::ofstream fLogFile;
  bool fTrace;

  BRM::DBRM fdbrm;

  // do not implement
  BlockRequestProcessor(const BlockRequestProcessor& brp);
  BlockRequestProcessor& operator=(const BlockRequestProcessor& brp);
};

}  // namespace dbbc