1 // Copyright 2014 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 COMPONENTS_LEVELDB_PROTO_PROTO_DATABASE_H_ 6 #define COMPONENTS_LEVELDB_PROTO_PROTO_DATABASE_H_ 7 8 #include <string> 9 #include <utility> 10 #include <vector> 11 12 #include "base/callback.h" 13 #include "base/files/file_path.h" 14 #include "base/memory/scoped_ptr.h" 15 16 namespace leveldb_proto { 17 18 // Interface for classes providing persistent storage of Protocol Buffer 19 // entries (T must be a Proto type extending MessageLite). 20 template <typename T> 21 class ProtoDatabase { 22 public: 23 typedef base::Callback<void(bool success)> InitCallback; 24 typedef base::Callback<void(bool success)> UpdateCallback; 25 typedef base::Callback<void(bool success, scoped_ptr<std::vector<T> >)> 26 LoadCallback; 27 // A list of key-value (string, T) tuples. 28 typedef std::vector<std::pair<std::string, T> > KeyEntryVector; 29 30 virtual ~ProtoDatabase() {} 31 32 // Asynchronously initializes the object. |callback| will be invoked on the 33 // calling thread when complete. 34 virtual void Init(const base::FilePath& database_dir, 35 InitCallback callback) = 0; 36 37 // Asynchronously saves |entries_to_save| and deletes entries from 38 // |keys_to_remove| from the database. |callback| will be invoked on the 39 // calling thread when complete. 40 virtual void UpdateEntries( 41 scoped_ptr<KeyEntryVector> entries_to_save, 42 scoped_ptr<std::vector<std::string> > keys_to_remove, 43 UpdateCallback callback) = 0; 44 45 // Asynchronously loads all entries from the database and invokes |callback| 46 // when complete. 47 virtual void LoadEntries(LoadCallback callback) = 0; 48 }; 49 50 } // namespace leveldb_proto 51 52 #endif // COMPONENTS_LEVELDB_PROTO_PROTO_DATABASE_H_ 53
