leveldb_database.h revision e5d81f57cb97b3b6b7fccc9c5610d21eb81db09d
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/comparator.h" 16#include "third_party/leveldatabase/src/include/leveldb/status.h" 17 18namespace leveldb { 19class Comparator; 20class DB; 21class Env; 22class Snapshot; 23} 24 25namespace content { 26 27class LevelDBComparator; 28class LevelDBDatabase; 29class LevelDBIterator; 30class LevelDBWriteBatch; 31 32class LevelDBSnapshot { 33 private: 34 friend class LevelDBDatabase; 35 friend class LevelDBTransaction; 36 37 explicit LevelDBSnapshot(LevelDBDatabase* db); 38 ~LevelDBSnapshot(); 39 40 leveldb::DB* db_; 41 const leveldb::Snapshot* snapshot_; 42}; 43 44class CONTENT_EXPORT LevelDBLock { 45public: 46 virtual ~LevelDBLock() {} 47}; 48 49class CONTENT_EXPORT LevelDBDatabase { 50 public: 51 class ComparatorAdapter : public leveldb::Comparator { 52 public: 53 explicit ComparatorAdapter(const LevelDBComparator* comparator); 54 55 virtual int Compare(const leveldb::Slice& a, 56 const leveldb::Slice& b) const OVERRIDE; 57 58 virtual const char* Name() const OVERRIDE; 59 60 virtual void FindShortestSeparator(std::string* start, 61 const leveldb::Slice& limit) const 62 OVERRIDE; 63 virtual void FindShortSuccessor(std::string* key) const OVERRIDE; 64 65 private: 66 const LevelDBComparator* comparator_; 67 }; 68 69 static leveldb::Status Open(const base::FilePath& file_name, 70 const LevelDBComparator* comparator, 71 scoped_ptr<LevelDBDatabase>* db, 72 bool* is_disk_full = 0); 73 static scoped_ptr<LevelDBDatabase> OpenInMemory( 74 const LevelDBComparator* comparator); 75 static leveldb::Status Destroy(const base::FilePath& file_name); 76 static scoped_ptr<LevelDBLock> LockForTesting( 77 const base::FilePath& file_name); 78 virtual ~LevelDBDatabase(); 79 80 leveldb::Status Put(const base::StringPiece& key, std::string* value); 81 leveldb::Status Remove(const base::StringPiece& key); 82 virtual leveldb::Status Get(const base::StringPiece& key, 83 std::string* value, 84 bool* found, 85 const LevelDBSnapshot* = 0); 86 leveldb::Status Write(const LevelDBWriteBatch& write_batch); 87 scoped_ptr<LevelDBIterator> CreateIterator(const LevelDBSnapshot* = 0); 88 const LevelDBComparator* Comparator() const; 89 void Compact(const base::StringPiece& start, const base::StringPiece& stop); 90 void CompactAll(); 91 92 protected: 93 LevelDBDatabase(); 94 95 private: 96 friend class LevelDBSnapshot; 97 98 scoped_ptr<leveldb::Env> env_; 99 scoped_ptr<leveldb::Comparator> comparator_adapter_; 100 scoped_ptr<leveldb::DB> db_; 101 const LevelDBComparator* comparator_; 102}; 103 104} // namespace content 105 106#endif // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_ 107