| // 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 CHROME_BROWSER_PREFS_LEVELDB_PREF_STORE_H_ |
| #define CHROME_BROWSER_PREFS_LEVELDB_PREF_STORE_H_ |
| |
| #include <set> |
| #include <string> |
| |
| #include "base/basictypes.h" |
| #include "base/compiler_specific.h" |
| #include "base/files/file_path.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/message_loop/message_loop_proxy.h" |
| #include "base/observer_list.h" |
| #include "base/prefs/persistent_pref_store.h" |
| #include "base/prefs/pref_value_map.h" |
| #include "base/timer/timer.h" |
| |
| namespace base { |
| class DictionaryValue; |
| class SequencedTaskRunner; |
| class Value; |
| } |
| |
| namespace leveldb { |
| class DB; |
| } |
| |
| // A writable PrefStore implementation that is used for user preferences. |
| class LevelDBPrefStore : public PersistentPrefStore { |
| public: |
| // |sequenced_task_runner| is must be a shutdown-blocking task runner, ideally |
| // created by GetTaskRunnerForFile() method above. |
| LevelDBPrefStore(const base::FilePath& pref_filename, |
| base::SequencedTaskRunner* sequenced_task_runner); |
| |
| // PrefStore overrides: |
| virtual bool GetValue(const std::string& key, |
| const base::Value** result) const override; |
| virtual void AddObserver(PrefStore::Observer* observer) override; |
| virtual void RemoveObserver(PrefStore::Observer* observer) override; |
| virtual bool HasObservers() const override; |
| virtual bool IsInitializationComplete() const override; |
| |
| // PersistentPrefStore overrides: |
| virtual bool GetMutableValue(const std::string& key, |
| base::Value** result) override; |
| // Takes ownership of value. |
| virtual void SetValue(const std::string& key, base::Value* value) override; |
| virtual void SetValueSilently(const std::string& key, |
| base::Value* value) override; |
| virtual void RemoveValue(const std::string& key) override; |
| virtual bool ReadOnly() const override; |
| virtual PrefReadError GetReadError() const override; |
| virtual PrefReadError ReadPrefs() override; |
| virtual void ReadPrefsAsync(ReadErrorDelegate* error_delegate) override; |
| virtual void CommitPendingWrite() override; |
| virtual void ReportValueChanged(const std::string& key) override; |
| |
| private: |
| struct ReadingResults; |
| class FileThreadSerializer; |
| |
| virtual ~LevelDBPrefStore(); |
| |
| static scoped_ptr<ReadingResults> DoReading(const base::FilePath& path); |
| static void OpenDB(const base::FilePath& path, |
| ReadingResults* reading_results); |
| void OnStorageRead(scoped_ptr<ReadingResults> reading_results); |
| |
| void PersistFromUIThread(); |
| void RemoveFromUIThread(const std::string& key); |
| void ScheduleWrite(); |
| |
| void SetValueInternal(const std::string& key, |
| base::Value* value, |
| bool notify); |
| void NotifyObservers(const std::string& key); |
| void MarkForInsertion(const std::string& key, const std::string& value); |
| void MarkForDeletion(const std::string& key); |
| |
| base::FilePath path_; |
| |
| const scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner_; |
| const scoped_refptr<base::SequencedTaskRunner> original_task_runner_; |
| |
| PrefValueMap prefs_; |
| |
| bool read_only_; |
| |
| ObserverList<PrefStore::Observer, true> observers_; |
| |
| scoped_ptr<ReadErrorDelegate> error_delegate_; |
| |
| bool initialized_; |
| PrefReadError read_error_; |
| |
| // This object is created on the UI thread right after preferences are loaded |
| // from disk. A message to delete it is sent to the FILE thread by |
| // ~LevelDBPrefStore. |
| scoped_ptr<FileThreadSerializer> serializer_; |
| |
| // Changes are accumulated in |keys_to_delete_| and |keys_to_set_| and are |
| // stored in the database according to |timer_|. |
| std::set<std::string> keys_to_delete_; |
| std::map<std::string, std::string> keys_to_set_; |
| base::OneShotTimer<LevelDBPrefStore> timer_; |
| |
| base::WeakPtrFactory<LevelDBPrefStore> weak_ptr_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(LevelDBPrefStore); |
| }; |
| |
| #endif // CHROME_BROWSER_PREFS_LEVELDB_PREF_STORE_H_ |