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// 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:
bool GetValue(const std::string& key,
const base::Value** result) const override;
void AddObserver(PrefStore::Observer* observer) override;
void RemoveObserver(PrefStore::Observer* observer) override;
bool HasObservers() const override;
bool IsInitializationComplete() const override;
// PersistentPrefStore overrides:
bool GetMutableValue(const std::string& key, base::Value** result) override;
// Takes ownership of value.
void SetValue(const std::string& key, base::Value* value) override;
void SetValueSilently(const std::string& key, base::Value* value) override;
void RemoveValue(const std::string& key) override;
bool ReadOnly() const override;
PrefReadError GetReadError() const override;
PrefReadError ReadPrefs() override;
void ReadPrefsAsync(ReadErrorDelegate* error_delegate) override;
void CommitPendingWrite() override;
void ReportValueChanged(const std::string& key) override;
private:
struct ReadingResults;
class FileThreadSerializer;
~LevelDBPrefStore() override;
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_
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