CellListScannerBuffer.h

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/*
 * 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_CellListScannerBuffer_h
#define Hypertable_RangeServer_CellListScannerBuffer_h

#include "CellListScanner.h"

#include <Common/PageArena.h>
#include <Common/StlAllocator.h>

namespace Hypertable {

  class CellListScannerBuffer : public CellListScanner {
  public:

    CellListScannerBuffer(ScanContextPtr &scan_ctx);

    virtual ~CellListScannerBuffer() { return; }

    void add(const SerializedKey key, const ByteString value);

    virtual void forward();
    virtual bool get(Key &key, ByteString &value);

    virtual int64_t get_disk_read() { return m_disk_read; }

  private:

    void initialize_for_scan();

    typedef std::pair<SerializedKey, ByteString> KeyValueT;

    typedef StlAllocator<KeyValueT> KeyValueAllocT;

    typedef std::vector<KeyValueT, KeyValueAllocT> KeyValueVectorT;

    struct LtKeyValueT {
      bool operator()(const KeyValueT &kv1, const KeyValueT &kv2) const {
        return kv1.first < kv2.first;
      }
    };

    ScanContextPtr m_scan_context;

    KeyValueVectorT m_cells;

    KeyValueVectorT::iterator m_iter;

    ByteArena m_arena;

    bool m_initialized_for_scan {};
  };

}

#endif // Hypertable_RangeServer_CellListScannerBuffer_h