CellCacheManager.h

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/* -*- 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_CellCacheManager_h
#define Hypertable_RangeServer_CellCacheManager_h

#include <Hypertable/RangeServer/CellCache.h>
#include <Hypertable/RangeServer/CellList.h>
#include <Hypertable/RangeServer/CellListScanner.h>
#include <Hypertable/RangeServer/MergeScannerAccessGroup.h>
#include <Hypertable/RangeServer/ScanContext.h>

#include <Hypertable/Lib/Schema.h>

#include <memory>

namespace Hypertable {


  class CellCacheManager {

  public:

    CellCacheManager() : m_active_cache{new CellCache()} { }

    virtual ~CellCacheManager() { }

    void install_new_active_cache(CellCachePtr new_cache) {
      m_active_cache = new_cache;
    }

    void install_new_immutable_cache(CellCachePtr new_cache) {
      m_immutable_cache = new_cache;
    }

    void merge_caches(SchemaPtr &schema);

    void add(const Key &key, const ByteString value) {
      m_active_cache->add(key, value);
    }

    void add_counter(const Key &key, const ByteString value) {
      m_active_cache->add_counter(key, value);
    }

    void add(CellListScannerPtr &scanner);

    void add_immutable_scanner(MergeScannerAccessGroup *mscanner,
                               ScanContext *scan_ctx);

    void add_scanners(MergeScannerAccessGroup *scanner,
                      ScanContext *scan_ctx);

    void split_row_estimate_data(CellList::SplitRowDataMapT &split_row_data);

    CellListScannerPtr create_immutable_scanner(ScanContext *scan_ctx) {
      return m_immutable_cache ? 
        m_immutable_cache->create_scanner(scan_ctx) : CellListScannerPtr();
    }

    void lock() { m_active_cache->lock(); }

    void unlock() { m_active_cache->unlock(); }

    CellCachePtr &active_cache() { return m_active_cache; }

    CellCachePtr &immutable_cache() {
      return m_immutable_cache;
    }

    void drop_immutable_cache() { m_immutable_cache = nullptr; }

    size_t immutable_items() {
      return m_immutable_cache ? m_immutable_cache->size() : 0;
    }

    bool empty() {
      return m_active_cache->empty() && immutable_cache_empty();
    }

    bool immutable_cache_empty() {
      return !m_immutable_cache || m_immutable_cache->empty();
    }

    int64_t memory_used();

    int64_t logical_size();

    void get_cache_statistics(CellCache::Statistics &stats);

    int32_t delete_count();

    void freeze();

    void populate_key_set(KeySet &keys);

  private:

    CellCachePtr m_active_cache;

    CellCachePtr m_immutable_cache;
  };

  typedef std::shared_ptr<CellCacheManager> CellCacheManagerPtr;


}

#endif // Hypertable_RangeServer_CellCacheManager_h