content/browser/indexed_db/leveldb/leveldb_database.h

   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
  17 namespace leveldb {
  18 class Comparator;
  19 class DB;
  20 class Env;
  21 class Snapshot;
  22 }
  23
  24 namespace content {
  25
  26 class LevelDBComparator;
  27 class LevelDBDatabase;
  28 class LevelDBIterator;
  29 class LevelDBWriteBatch;
  30
  31 class 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
  43 class CONTENT_EXPORT LevelDBLock {
  44 public:
  45   virtual ~LevelDBLock() {}
  46 };
  47
  48 class 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_