| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COMPONENTS_LEVELDB_PROTO_LEVELDB_DATABASE_H_ |
| #define COMPONENTS_LEVELDB_PROTO_LEVELDB_DATABASE_H_ |
| |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "base/gtest_prod_util.h" |
| #include "base/macros.h" |
| #include "base/strings/string_split.h" |
| #include "base/threading/thread_collision_warner.h" |
| #include "third_party/leveldatabase/env_chromium.h" |
| |
| namespace base { |
| class FilePath; |
| class HistogramBase; |
| } // namespace base |
| |
| namespace leveldb { |
| class Cache; |
| class DB; |
| class Env; |
| } // namespace leveldb |
| |
| namespace leveldb_proto { |
| |
| // Interacts with the LevelDB third party module. |
| // Once constructed, function calls and destruction should all occur on the |
| // same thread (not necessarily the same as the constructor). |
| class LevelDB { |
| public: |
| // Constructor. Does *not* open a leveldb - only initialize this class. |
| // |client_name| is the name of the "client" that owns this instance. Used |
| // for UMA statics as so: LevelDB.<value>.<client name>. It is best to not |
| // change once shipped. |
| explicit LevelDB(const char* client_name); |
| virtual ~LevelDB(); |
| |
| // Initializes a leveldb with the given options. If |database_dir| is |
| // empty, this opens an in-memory db. |
| virtual bool Init(const base::FilePath& database_dir, |
| const leveldb_env::Options& options); |
| |
| virtual bool Save(const base::StringPairs& pairs_to_save, |
| const std::vector<std::string>& keys_to_remove); |
| virtual bool Load(std::vector<std::string>* entries); |
| virtual bool LoadKeys(std::vector<std::string>* keys); |
| virtual bool Get(const std::string& key, bool* found, std::string* entry); |
| // Close (if currently open) and then destroy (i.e. delete) the database |
| // directory. |
| virtual bool Destroy(); |
| |
| private: |
| FRIEND_TEST_ALL_PREFIXES(ProtoDatabaseImplLevelDBTest, TestDBInitFail); |
| |
| DFAKE_MUTEX(thread_checker_); |
| |
| // The declaration order of these members matters: |db_| depends on |env_| and |
| // therefore has to be destructed first. |
| std::unique_ptr<leveldb::Env> env_; |
| std::unique_ptr<leveldb::DB> db_; |
| base::FilePath database_dir_; |
| leveldb_env::Options open_options_; |
| base::HistogramBase* open_histogram_; |
| base::HistogramBase* destroy_histogram_; |
| |
| DISALLOW_COPY_AND_ASSIGN(LevelDB); |
| }; |
| |
| } // namespace leveldb_proto |
| |
| #endif // COMPONENTS_LEVELDB_PROTO_LEVELDB_DATABASE_H_ |