1 // Copyright 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.
5 #ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_LOCAL_FILE_SYNC_STATUS_H_
6 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_LOCAL_FILE_SYNC_STATUS_H_
11 #include "base/basictypes.h"
12 #include "base/compiler_specific.h"
13 #include "base/gtest_prod_util.h"
14 #include "base/observer_list.h"
15 #include "base/threading/non_thread_safe.h"
16 #include "webkit/browser/fileapi/file_system_url.h"
22 namespace sync_file_system {
24 // Represents local file sync status.
25 // This class is supposed to run only on IO thread.
27 // This class manages two important synchronization flags: writing (counter)
28 // and syncing (flag). Writing counter keeps track of which URL is in
29 // writing and syncing flag indicates which URL is in syncing.
31 // An entry can have multiple writers but sync is exclusive and cannot overwrap
32 // with any writes or syncs.
33 class LocalFileSyncStatus
34 : public base::NonThreadSafe {
36 typedef std::pair<GURL, fileapi::FileSystemType> OriginAndType;
41 virtual ~Observer() {}
42 virtual void OnSyncEnabled(const fileapi::FileSystemURL& url) = 0;
43 virtual void OnWriteEnabled(const fileapi::FileSystemURL& url) = 0;
45 DISALLOW_COPY_AND_ASSIGN(Observer);
48 LocalFileSyncStatus();
49 ~LocalFileSyncStatus();
51 // Increment writing counter for |url|.
52 // This should not be called if the |url| is not writable.
53 void StartWriting(const fileapi::FileSystemURL& url);
55 // Decrement writing counter for |url|.
56 void EndWriting(const fileapi::FileSystemURL& url);
58 // Start syncing for |url| and disable writing.
59 // This should not be called if |url| is in syncing or in writing.
60 void StartSyncing(const fileapi::FileSystemURL& url);
62 // Clears the syncing flag for |url| and enable writing.
63 void EndSyncing(const fileapi::FileSystemURL& url);
65 // Returns true if the |url| or its parent or child is in writing.
66 bool IsWriting(const fileapi::FileSystemURL& url) const;
68 // Returns true if the |url| is enabled for writing (i.e. not in syncing).
69 bool IsWritable(const fileapi::FileSystemURL& url) const;
71 // Returns true if the |url| is enabled for syncing (i.e. neither in
72 // syncing nor writing).
73 bool IsSyncable(const fileapi::FileSystemURL& url) const;
75 void AddObserver(Observer* observer);
76 void RemoveObserver(Observer* observer);
79 FRIEND_TEST_ALL_PREFIXES(LocalFileSyncStatusTest, WritingOnPathsWithPeriod);
80 FRIEND_TEST_ALL_PREFIXES(LocalFileSyncStatusTest, SyncingOnPathsWithPeriod);
82 typedef std::set<base::FilePath> PathSet;
83 typedef std::map<OriginAndType, PathSet> URLSet;
85 typedef std::map<base::FilePath, int64> PathBucket;
86 typedef std::map<OriginAndType, PathBucket> URLBucket;
88 bool IsChildOrParentWriting(const fileapi::FileSystemURL& url) const;
89 bool IsChildOrParentSyncing(const fileapi::FileSystemURL& url) const;
91 // If this count is non-zero positive there're ongoing write operations.
94 // If this flag is set sync process is running on the file.
97 ObserverList<Observer> observer_list_;
99 DISALLOW_COPY_AND_ASSIGN(LocalFileSyncStatus);
102 } // namespace sync_file_system
104 #endif // CHROME_BROWSER_SYNC_FILE_SYSTEM_LOCAL_LOCAL_FILE_SYNC_STATUS_H_