rust-librocksdb-sys 0.43.0+11.0.4

Native bindings to librocksdb
Documentation 
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// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

#include "rocksdb/utilities/memory_util.h"

#include "db/db_impl/db_impl.h"

namespace ROCKSDB_NAMESPACE {

template <typename DBPtr>
Status MemoryUtil::GetApproximateMemoryUsageByType(
    const std::vector<DBPtr>& dbs,
    const std::unordered_set<const Cache*> cache_set,
    std::map<MemoryUtil::UsageType, uint64_t>* usage_by_type) {
  usage_by_type->clear();

  // MemTable
  for (auto& db : dbs) {
    uint64_t usage = 0;
    if (db->GetAggregatedIntProperty(DB::Properties::kSizeAllMemTables,
                                     &usage)) {
      (*usage_by_type)[MemoryUtil::kMemTableTotal] += usage;
    }
    if (db->GetAggregatedIntProperty(DB::Properties::kCurSizeAllMemTables,
                                     &usage)) {
      (*usage_by_type)[MemoryUtil::kMemTableUnFlushed] += usage;
    }
  }

  // Table Readers
  for (auto& db : dbs) {
    uint64_t usage = 0;
    if (db->GetAggregatedIntProperty(DB::Properties::kEstimateTableReadersMem,
                                     &usage)) {
      (*usage_by_type)[MemoryUtil::kTableReadersTotal] += usage;
    }
  }

  // Cache
  for (const auto* cache : cache_set) {
    if (cache != nullptr) {
      (*usage_by_type)[MemoryUtil::kCacheTotal] += cache->GetUsage();
    }
  }

  return Status::OK();
}

template Status MemoryUtil::GetApproximateMemoryUsageByType<DB*>(
    const std::vector<DB*>& dbs,
    const std::unordered_set<const Cache*> cache_set,
    std::map<MemoryUtil::UsageType, uint64_t>* usage_by_type);

template Status
MemoryUtil::GetApproximateMemoryUsageByType<std::unique_ptr<DB>>(
    const std::vector<std::unique_ptr<DB>>& dbs,
    const std::unordered_set<const Cache*> cache_set,
    std::map<MemoryUtil::UsageType, uint64_t>* usage_by_type);

}  // namespace ROCKSDB_NAMESPACE