This is the implementation of the primary and secondary blob journals for

content/browser/indexed_db/indexed_db_backing_store.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_BACKING_STORE_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_BACKING_STORE_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 352 matching lines @@
     virtual ~Transaction();
     virtual void Begin();
     virtual leveldb::Status Commit();
     virtual void Rollback();
     void Reset() {
       backing_store_ = NULL;
       transaction_ = NULL;
     }
     void PutBlobInfo(int64 database_id,
                      int64 object_store_id,
-                     const std::string& key,
+                     const std::string& object_store_data_key,
                      std::vector<IndexedDBBlobInfo>*,
                      ScopedVector<webkit_blob::BlobDataHandle>* handles);
 
     LevelDBTransaction* transaction() { return transaction_; }
 
     // This holds a BlobEntryKey and the encoded IndexedDBBlobInfo vector stored
     // under that key.
     typedef std::vector<std::pair<BlobEntryKey, std::string> >
         BlobEntryKeyValuePairVec;
 
@@ skipping 80 matching lines @@
                         scoped_ptr<LevelDBComparator> comparator,
                         base::TaskRunner* task_runner);
   virtual ~IndexedDBBackingStore();
   friend class base::RefCounted<IndexedDBBackingStore>;
 
   virtual bool WriteBlobFile(
       int64 database_id,
       const Transaction::WriteDescriptor& descriptor,
       Transaction::ChainedBlobWriter* chained_blob_writer);
   virtual bool RemoveBlobFile(int64 database_id, int64 key);
+  virtual void StartJournalCleaningTimer();
+  void CleanPrimaryJournalIgnoreReturn();
 
  private:
   static scoped_refptr<IndexedDBBackingStore> Create(
       IndexedDBFactory* indexed_db_factory,
       const GURL& origin_url,
       const base::FilePath& blob_path,
       net::URLRequestContext* request_context,
       scoped_ptr<LevelDBDatabase> db,
       scoped_ptr<LevelDBComparator> comparator,
       base::TaskRunner* task_runner);
 
   static bool ReadCorruptionInfo(const base::FilePath& path_base,
                                  const GURL& origin_url,
                                  std::string& message);
 
   leveldb::Status FindKeyInIndex(
       IndexedDBBackingStore::Transaction* transaction,
       int64 database_id,
       int64 object_store_id,
       int64 index_id,
       const IndexedDBKey& key,
       std::string* found_encoded_primary_key,
       bool* found);
   leveldb::Status GetIndexes(int64 database_id,
                              int64 object_store_id,
                              IndexedDBObjectStoreMetadata::IndexMap* map)
       WARN_UNUSED_RESULT;
   bool RemoveBlobDirectory(int64 database_id);
+  leveldb::Status CleanUpBlobJournal(const std::string& level_db_key);
 
   IndexedDBFactory* indexed_db_factory_;
   const GURL origin_url_;
   base::FilePath blob_path_;
 
   // The origin identifier is a key prefix unique to the origin used in the
   // leveldb backing store to partition data by origin. It is a normalized
   // version of the origin URL with a versioning suffix appended, e.g.
   // "http_localhost_81@1" Since only one origin is stored per backing store
   // this is redundant but necessary for backwards compatibility; the suffix
   // provides for future flexibility.
   const std::string origin_identifier_;
 
   net::URLRequestContext* request_context_;
   base::TaskRunner* task_runner_;
   std::set<int> child_process_ids_granted_;
+  base::OneShotTimer<IndexedDBBackingStore> journal_cleaning_timer_;
 
   scoped_ptr<LevelDBDatabase> db_;
   scoped_ptr<LevelDBComparator> comparator_;
   // Whenever blobs are registered in active_blob_registry_, indexed_db_factory_
   // will hold a reference to this backing store.
   IndexedDBActiveBlobRegistry active_blob_registry_;
   base::OneShotTimer<IndexedDBBackingStore> close_timer_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_BACKING_STORE_H_