CellStoreScannerIntervalBlockIndex.h

Go to the documentation of this file.

/* -*- c++ -*-
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable 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 3 of the
 * License, or any later version.
 *
 * Hypertable 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.
 */


#ifndef Hypertable_RangeServer_CellStoreScannerIntervalBlockIndex_h
#define Hypertable_RangeServer_CellStoreScannerIntervalBlockIndex_h

#include <Hypertable/RangeServer/CellStore.h>
#include <Hypertable/RangeServer/CellStoreScannerInterval.h>
#include <Hypertable/RangeServer/ScanContext.h>

#include <Common/DynamicBuffer.h>

namespace Hypertable {

  class BlockCompressionCodec;


  template <typename IndexT>
  class CellStoreScannerIntervalBlockIndex : public CellStoreScannerInterval {
  public:

    typedef typename IndexT::iterator IndexIteratorT;

    CellStoreScannerIntervalBlockIndex(CellStorePtr &cellstore, IndexT *index,
                                       SerializedKey start_key, SerializedKey end_key, ScanContext *scan_ctx);
    virtual ~CellStoreScannerIntervalBlockIndex();
    virtual void forward();
    virtual bool get(Key &key, ByteString &value);

  private:

    bool fetch_next_block(bool eob=false);

    CellStorePtr          m_cellstore;
    IndexT               *m_index {};
    IndexIteratorT        m_iter;
    BlockInfo             m_block;
    Key                   m_key;
    SerializedKey         m_cur_key;
    ByteString            m_cur_value;
    SerializedKey         m_start_key;
    SerializedKey         m_end_key;
    const char *          m_end_row {};
    DynamicBuffer         m_key_buf;
    BlockCompressionCodec *m_zcodec {};
    KeyDecompressor      *m_key_decompressor {};
    int32_t               m_fd {-1};
    bool                  m_cached {};
    bool                  m_check_for_range_end {};
    int                   m_file_id {};
    ScanContext          *m_scan_ctx {};
    ScanContext::CstrRowSet& m_rowset;
  };

}

#endif // Hypertable_RangeServer_CellStoreScannerIntervalBlockIndex_h