leveldb_database.h revision a1401311d1ab56c4ed0a474bd38c108f75cb0cd9 
1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
6#define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
7
8#include <string>
9
10#include "base/files/file_path.h"
11#include "base/memory/scoped_ptr.h"
12#include "base/strings/string16.h"
13#include "base/strings/string_piece.h"
14#include "content/common/content_export.h"
15#include "third_party/leveldatabase/src/include/leveldb/status.h"
16
17namespace leveldb {
18class Comparator;
19class DB;
20class Env;
21class Snapshot;
22}
23
24namespace content {
25
26class LevelDBComparator;
27class LevelDBDatabase;
28class LevelDBIterator;
29class LevelDBWriteBatch;
30
31class LevelDBSnapshot {
32 private:
33  friend class LevelDBDatabase;
34  friend class LevelDBTransaction;
35
36  explicit LevelDBSnapshot(LevelDBDatabase* db);
37  ~LevelDBSnapshot();
38
39  leveldb::DB* db_;
40  const leveldb::Snapshot* snapshot_;
41};
42
43class CONTENT_EXPORT LevelDBLock {
44public:
45  virtual ~LevelDBLock() {}
46};
47
48class CONTENT_EXPORT LevelDBDatabase {
49 public:
50  static leveldb::Status Open(const base::FilePath& file_name,
51                              const LevelDBComparator* comparator,
52                              scoped_ptr<LevelDBDatabase>* db,
53                              bool* is_disk_full = 0);
54  static scoped_ptr<LevelDBDatabase> OpenInMemory(
55      const LevelDBComparator* comparator);
56  static leveldb::Status Destroy(const base::FilePath& file_name);
57  static scoped_ptr<LevelDBLock> LockForTesting(
58      const base::FilePath& file_name);
59  virtual ~LevelDBDatabase();
60
61  leveldb::Status Put(const base::StringPiece& key, std::string* value);
62  leveldb::Status Remove(const base::StringPiece& key);
63  virtual leveldb::Status Get(const base::StringPiece& key,
64                              std::string* value,
65                              bool* found,
66                              const LevelDBSnapshot* = 0);
67  leveldb::Status Write(const LevelDBWriteBatch& write_batch);
68  scoped_ptr<LevelDBIterator> CreateIterator(const LevelDBSnapshot* = 0);
69  const LevelDBComparator* Comparator() const;
70  void Compact(const base::StringPiece& start, const base::StringPiece& stop);
71
72 protected:
73  LevelDBDatabase();
74
75 private:
76  friend class LevelDBSnapshot;
77
78  scoped_ptr<leveldb::Env> env_;
79  scoped_ptr<leveldb::Comparator> comparator_adapter_;
80  scoped_ptr<leveldb::DB> db_;
81  const LevelDBComparator* comparator_;
82};
83
84}  // namespace content
85
86#endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
87