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| 1 // Copyright (c) 2012 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 BASE_PREFS_PERSISTENT_PREF_STORE_H_ | |
| 6 #define BASE_PREFS_PERSISTENT_PREF_STORE_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 | |
| 10 #include "base/prefs/base_prefs_export.h" | |
| 11 #include "base/prefs/writeable_pref_store.h" | |
| 12 | |
| 13 // This interface is complementary to the PrefStore interface, declaring | |
| 14 // additional functionality that adds support for setting values and persisting | |
| 15 // the data to some backing store. | |
| 16 class BASE_PREFS_EXPORT PersistentPrefStore : public WriteablePrefStore { | |
| 17 public: | |
| 18 // Unique integer code for each type of error so we can report them | |
| 19 // distinctly in a histogram. | |
| 20 // NOTE: Don't change the explicit values of the enums as it will change the | |
| 21 // server's meaning of the histogram. | |
| 22 enum PrefReadError { | |
| 23 PREF_READ_ERROR_NONE = 0, | |
| 24 PREF_READ_ERROR_JSON_PARSE = 1, | |
| 25 PREF_READ_ERROR_JSON_TYPE = 2, | |
| 26 PREF_READ_ERROR_ACCESS_DENIED = 3, | |
| 27 PREF_READ_ERROR_FILE_OTHER = 4, | |
| 28 PREF_READ_ERROR_FILE_LOCKED = 5, | |
| 29 PREF_READ_ERROR_NO_FILE = 6, | |
| 30 PREF_READ_ERROR_JSON_REPEAT = 7, | |
| 31 // PREF_READ_ERROR_OTHER = 8, // Deprecated. | |
| 32 PREF_READ_ERROR_FILE_NOT_SPECIFIED = 9, | |
| 33 // Indicates that ReadPrefs() couldn't complete synchronously and is waiting | |
| 34 // for an asynchronous task to complete first. | |
| 35 PREF_READ_ERROR_ASYNCHRONOUS_TASK_INCOMPLETE = 10, | |
| 36 PREF_READ_ERROR_LEVELDB_IO = 11, | |
| 37 PREF_READ_ERROR_LEVELDB_CORRUPTION_READ_ONLY = 12, | |
| 38 PREF_READ_ERROR_LEVELDB_CORRUPTION = 13, | |
| 39 PREF_READ_ERROR_MAX_ENUM | |
| 40 }; | |
| 41 | |
| 42 class ReadErrorDelegate { | |
| 43 public: | |
| 44 virtual ~ReadErrorDelegate() {} | |
| 45 | |
| 46 virtual void OnError(PrefReadError error) = 0; | |
| 47 }; | |
| 48 | |
| 49 // Whether the store is in a pseudo-read-only mode where changes are not | |
| 50 // actually persisted to disk. This happens in some cases when there are | |
| 51 // read errors during startup. | |
| 52 virtual bool ReadOnly() const = 0; | |
| 53 | |
| 54 // Gets the read error. Only valid if IsInitializationComplete() returns true. | |
| 55 virtual PrefReadError GetReadError() const = 0; | |
| 56 | |
| 57 // Reads the preferences from disk. Notifies observers via | |
| 58 // "PrefStore::OnInitializationCompleted" when done. | |
| 59 virtual PrefReadError ReadPrefs() = 0; | |
| 60 | |
| 61 // Reads the preferences from disk asynchronously. Notifies observers via | |
| 62 // "PrefStore::OnInitializationCompleted" when done. Also it fires | |
| 63 // |error_delegate| if it is not NULL and reading error has occurred. | |
| 64 // Owns |error_delegate|. | |
| 65 virtual void ReadPrefsAsync(ReadErrorDelegate* error_delegate) = 0; | |
| 66 | |
| 67 // Lands any pending writes to disk. | |
| 68 virtual void CommitPendingWrite() = 0; | |
| 69 | |
| 70 // Schedule a write if there is any lossy data pending. Unlike | |
| 71 // CommitPendingWrite() this does not immediately sync to disk, instead it | |
| 72 // triggers an eventual write if there is lossy data pending and if there | |
| 73 // isn't one scheduled already. | |
| 74 virtual void SchedulePendingLossyWrites() = 0; | |
| 75 | |
| 76 protected: | |
| 77 ~PersistentPrefStore() override {} | |
| 78 }; | |
| 79 | |
| 80 #endif // BASE_PREFS_PERSISTENT_PREF_STORE_H_ | |
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