chrome/browser/sync/glue/bookmark_model_associator.h

   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 CHROME_BROWSER_SYNC_GLUE_BOOKMARK_MODEL_ASSOCIATOR_H_
   6 #define CHROME_BROWSER_SYNC_GLUE_BOOKMARK_MODEL_ASSOCIATOR_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11
  12 #include "base/basictypes.h"
  13 #include "base/compiler_specific.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "chrome/browser/sync/glue/data_type_controller.h"
  16 #include "chrome/browser/sync/glue/data_type_error_handler.h"
  17 #include "chrome/browser/sync/glue/model_associator.h"
  18 #include "sync/internal_api/public/util/unrecoverable_error_handler.h"
  19
  20 class BookmarkModel;
  21 class BookmarkNode;
  22 class Profile;
  23
  24 namespace syncer {
  25 class BaseNode;
  26 class BaseTransaction;
  27 struct UserShare;
  28 }
  29
  30 namespace browser_sync {
  31
  32 // Contains all model association related logic:
  33 // * Algorithm to associate bookmark model and sync model.
  34 // * Methods to get a bookmark node for a given sync node and vice versa.
  35 // * Persisting model associations and loading them back.
  36 class BookmarkModelAssociator
  37     : public PerDataTypeAssociatorInterface<BookmarkNode, int64> {
  38  public:
  39   static syncer::ModelType model_type() { return syncer::BOOKMARKS; }
  40   // |expect_mobile_bookmarks_folder| controls whether or not we
  41   // expect the mobile bookmarks permanent folder to be created.
  42   // Should be set to true only by mobile clients.
  43   BookmarkModelAssociator(
  44       BookmarkModel* bookmark_model,
  45       Profile* profile_,
  46       syncer::UserShare* user_share,
  47       DataTypeErrorHandler* unrecoverable_error_handler,
  48       bool expect_mobile_bookmarks_folder);
  49   virtual ~BookmarkModelAssociator();
  50
  51   // Updates the visibility of the permanents node in the BookmarkModel.
  52   void UpdatePermanentNodeVisibility();
  53
  54   // AssociatorInterface implementation.
  55   //
  56   // AssociateModels iterates through both the sync and the browser
  57   // bookmark model, looking for matched pairs of items.  For any pairs it
  58   // finds, it will call AssociateSyncID.  For any unmatched items,
  59   // MergeAndAssociateModels will try to repair the match, e.g. by adding a new
  60   // node.  After successful completion, the models should be identical and
  61   // corresponding. Returns true on success.  On failure of this step, we
  62   // should abort the sync operation and report an error to the user.
  63   virtual syncer::SyncError AssociateModels(
  64       syncer::SyncMergeResult* local_merge_result,
  65       syncer::SyncMergeResult* syncer_merge_result) OVERRIDE;
  66
  67   virtual syncer::SyncError DisassociateModels() OVERRIDE;
  68
  69   // The has_nodes out param is true if the sync model has nodes other
  70   // than the permanent tagged nodes.
  71   virtual bool SyncModelHasUserCreatedNodes(bool* has_nodes) OVERRIDE;
  72
  73   // Returns sync id for the given bookmark node id.
  74   // Returns syncer::kInvalidId if the sync node is not found for the given
  75   // bookmark node id.
  76   virtual int64 GetSyncIdFromChromeId(const int64& node_id) OVERRIDE;
  77
  78   // Returns the bookmark node for the given sync id.
  79   // Returns NULL if no bookmark node is found for the given sync id.
  80   virtual const BookmarkNode* GetChromeNodeFromSyncId(int64 sync_id) OVERRIDE;
  81
  82   // Initializes the given sync node from the given bookmark node id.
  83   // Returns false if no sync node was found for the given bookmark node id or
  84   // if the initialization of sync node fails.
  85   virtual bool InitSyncNodeFromChromeId(
  86       const int64& node_id,
  87       syncer::BaseNode* sync_node) OVERRIDE;
  88
  89   // Associates the given bookmark node with the given sync id.
  90   virtual void Associate(const BookmarkNode* node, int64 sync_id) OVERRIDE;
  91   // Remove the association that corresponds to the given sync id.
  92   virtual void Disassociate(int64 sync_id) OVERRIDE;
  93
  94   virtual void AbortAssociation() OVERRIDE {
  95     // No implementation needed, this associator runs on the main
  96     // thread.
  97   }
  98
  99   // See ModelAssociator interface.
 100   virtual bool CryptoReadyIfNecessary() OVERRIDE;
 101
 102  protected:
 103   // Stores the id of the node with the given tag in |sync_id|.
 104   // Returns of that node was found successfully.
 105   // Tests override this.
 106   virtual bool GetSyncIdForTaggedNode(const std::string& tag, int64* sync_id);
 107
 108  private:
 109   typedef std::map<int64, int64> BookmarkIdToSyncIdMap;
 110   typedef std::map<int64, const BookmarkNode*> SyncIdToBookmarkNodeMap;
 111   typedef std::set<int64> DirtyAssociationsSyncIds;
 112
 113   // Posts a task to persist dirty associations.
 114   void PostPersistAssociationsTask();
 115   // Persists all dirty associations.
 116   void PersistAssociations();
 117
 118   // Matches up the bookmark model and the sync model to build model
 119   // associations.
 120   syncer::SyncError BuildAssociations(
 121       syncer::SyncMergeResult* local_merge_result,
 122       syncer::SyncMergeResult* syncer_merge_result);
 123
 124   // Removes bookmark nodes whose corresponding sync nodes have been deleted
 125   // according to sync delete journals. Return number of deleted bookmarks.
 126   int64 ApplyDeletesFromSyncJournal(syncer::BaseTransaction* trans);
 127
 128   // Associate a top-level node of the bookmark model with a permanent node in
 129   // the sync domain.  Such permanent nodes are identified by a tag that is
 130   // well known to the server and the client, and is unique within a particular
 131   // user's share.  For example, "other_bookmarks" is the tag for the Other
 132   // Bookmarks folder.  The sync nodes are server-created.
 133   // Returns true on success, false if association failed.
 134   bool AssociateTaggedPermanentNode(
 135       const BookmarkNode* permanent_node,
 136       const std::string& tag) WARN_UNUSED_RESULT;
 137
 138   // Compare the properties of a pair of nodes from either domain.
 139   bool NodesMatch(const BookmarkNode* bookmark,
 140                   const syncer::BaseNode* sync_node) const;
 141
 142   // Check whether bookmark model and sync model are synced by comparing
 143   // their transaction versions.
 144   void CheckModelSyncState() const;
 145
 146   BookmarkModel* bookmark_model_;
 147   Profile* profile_;
 148   syncer::UserShare* user_share_;
 149   DataTypeErrorHandler* unrecoverable_error_handler_;
 150   const bool expect_mobile_bookmarks_folder_;
 151   BookmarkIdToSyncIdMap id_map_;
 152   SyncIdToBookmarkNodeMap id_map_inverse_;
 153   // Stores sync ids for dirty associations.
 154   DirtyAssociationsSyncIds dirty_associations_sync_ids_;
 155
 156   // Used to post PersistAssociation tasks to the current message loop and
 157   // guarantees no invocations can occur if |this| has been deleted. (This
 158   // allows this class to be non-refcounted).
 159   base::WeakPtrFactory<BookmarkModelAssociator> weak_factory_;
 160
 161   DISALLOW_COPY_AND_ASSIGN(BookmarkModelAssociator);
 162 };
 163
 164 }  // namespace browser_sync
 165
 166 #endif  // CHROME_BROWSER_SYNC_GLUE_BOOKMARK_MODEL_ASSOCIATOR_H_