ceph/src/rocksdb/cache/cache.cc

   1 //  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5 //
   6 // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
   7 // Use of this source code is governed by a BSD-style license that can be
   8 // found in the LICENSE file. See the AUTHORS file for names of contributors.
   9
  10 #include "rocksdb/cache.h"
  11
  12 #include "cache/lru_cache.h"
  13 #include "rocksdb/utilities/options_type.h"
  14 #include "util/string_util.h"
  15
  16 namespace ROCKSDB_NAMESPACE {
  17 #ifndef ROCKSDB_LITE
  18 static std::unordered_map<std::string, OptionTypeInfo>
  19     lru_cache_options_type_info = {
  20         {"capacity",
  21          {offsetof(struct LRUCacheOptions, capacity), OptionType::kSizeT,
  22           OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
  23         {"num_shard_bits",
  24          {offsetof(struct LRUCacheOptions, num_shard_bits), OptionType::kInt,
  25           OptionVerificationType::kNormal, OptionTypeFlags::kMutable}},
  26         {"strict_capacity_limit",
  27          {offsetof(struct LRUCacheOptions, strict_capacity_limit),
  28           OptionType::kBoolean, OptionVerificationType::kNormal,
  29           OptionTypeFlags::kMutable}},
  30         {"high_pri_pool_ratio",
  31          {offsetof(struct LRUCacheOptions, high_pri_pool_ratio),
  32           OptionType::kDouble, OptionVerificationType::kNormal,
  33           OptionTypeFlags::kMutable}},
  34 };
  35 #endif  // ROCKSDB_LITE
  36
  37 Status Cache::CreateFromString(const ConfigOptions& config_options,
  38                                const std::string& value,
  39                                std::shared_ptr<Cache>* result) {
  40   Status status;
  41   std::shared_ptr<Cache> cache;
  42   if (value.find('=') == std::string::npos) {
  43     cache = NewLRUCache(ParseSizeT(value));
  44   } else {
  45 #ifndef ROCKSDB_LITE
  46     LRUCacheOptions cache_opts;
  47     status = OptionTypeInfo::ParseStruct(
  48         config_options, "", &lru_cache_options_type_info, "", value,
  49         reinterpret_cast<char*>(&cache_opts));
  50     if (status.ok()) {
  51       cache = NewLRUCache(cache_opts);
  52     }
  53 #else
  54     (void)config_options;
  55     status = Status::NotSupported("Cannot load cache in LITE mode ", value);
  56 #endif  //! ROCKSDB_LITE
  57   }
  58   if (status.ok()) {
  59     result->swap(cache);
  60   }
  61   return status;
  62 }
  63 }  // namespace ROCKSDB_NAMESPACE