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      1 // Copyright 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 SYNC_SYNCABLE_ON_DISK_DIRECTORY_BACKING_STORE_H_
      6 #define SYNC_SYNCABLE_ON_DISK_DIRECTORY_BACKING_STORE_H_
      7 
      8 #include "base/files/file_path.h"
      9 #include "sync/base/sync_export.h"
     10 #include "sync/syncable/directory_backing_store.h"
     11 
     12 namespace syncer {
     13 namespace syncable {
     14 
     15 // This is the concrete class that provides a useful implementation of
     16 // DirectoryBackingStore.
     17 class SYNC_EXPORT_PRIVATE OnDiskDirectoryBackingStore
     18     : public DirectoryBackingStore {
     19  public:
     20   OnDiskDirectoryBackingStore(const std::string& dir_name,
     21                               const base::FilePath& backing_filepath);
     22   virtual ~OnDiskDirectoryBackingStore();
     23   virtual DirOpenResult Load(
     24       Directory::MetahandlesMap* handles_map,
     25       JournalIndex* delete_journals,
     26       Directory::KernelLoadInfo* kernel_load_info) OVERRIDE;
     27 
     28   // A helper function that will make one attempt to load the directory.
     29   // Unlike Load(), it does not attempt to recover from failure.
     30   DirOpenResult TryLoad(
     31       Directory::MetahandlesMap* handles_map,
     32       JournalIndex* delete_journals,
     33       Directory::KernelLoadInfo* kernel_load_info);
     34 
     35  protected:
     36   // Subclasses may override this to avoid a possible DCHECK.
     37   virtual void ReportFirstTryOpenFailure();
     38 
     39  private:
     40   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MinorCorruption);
     41 
     42   bool allow_failure_for_test_;
     43   base::FilePath backing_filepath_;
     44 
     45   DISALLOW_COPY_AND_ASSIGN(OnDiskDirectoryBackingStore);
     46 };
     47 
     48 }  // namespace syncable
     49 }  // namespace syncer
     50 
     51 #endif  // SYNC_SYNCABLE_ON_DISK_DIRECTORY_BACKING_STORE_H_
     52