sync/syncable/in_memory_directory_backing_store.h

   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_IN_MEMORY_DIRECTORY_BACKING_STORE_H_
   6 #define SYNC_SYNCABLE_IN_MEMORY_DIRECTORY_BACKING_STORE_H_
   7
   8 #include "sync/syncable/directory_backing_store.h"
   9 #include "sync/base/sync_export.h"
  10
  11 namespace syncer {
  12 namespace syncable {
  13
  14 // This implementation of DirectoryBackingStore is used in tests that do not
  15 // require us to write to a file.  An in-memory sqlite database is much faster
  16 // than an on-disk database, so this can result in significant speedups in our
  17 // unit tests.
  18 //
  19 // An InMemoryDirectoryBackingStore cannot load data from existing databases.
  20 // When an InMemoryDirectoryBackingStore is destroyed, all data stored in this
  21 // database is lost.  If these limitations are a problem for you, consider using
  22 // TestDirectoryBackingStore.
  23 class SYNC_EXPORT_PRIVATE InMemoryDirectoryBackingStore
  24     : public DirectoryBackingStore {
  25  public:
  26   explicit InMemoryDirectoryBackingStore(const std::string& dir_name);
  27   DirOpenResult Load(Directory::MetahandlesMap* handles_map,
  28                      JournalIndex* delete_journals,
  29                      MetahandleSet* metahandles_to_purge,
  30                      Directory::KernelLoadInfo* kernel_load_info) override;
  31
  32   void request_consistent_cache_guid() {
  33     consistent_cache_guid_requested_ = true;
  34   }
  35
  36  private:
  37   bool consistent_cache_guid_requested_;
  38
  39   DISALLOW_COPY_AND_ASSIGN(InMemoryDirectoryBackingStore);
  40 };
  41
  42 }  // namespace syncable
  43 }  // namespace syncer
  44
  45 #endif  // SYNC_SYNCABLE_IN_MEMORY_DIRECTORY_BACKING_STORE_H_