Blob support for IDB [Chromium]

content/browser/indexed_db/leveldb/leveldb_transaction.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_LEVELDB_LEVELDB_TRANSACTION_H_
 #define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_TRANSACTION_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 138 matching lines @@
   void NotifyIteratorsOfTreeChange();
 
   LevelDBDatabase* db_;
   const LevelDBSnapshot snapshot_;
   const LevelDBComparator* comparator_;
   TreeType tree_;
   bool finished_;
   std::set<TransactionIterator*> iterators_;
 };
 
+// The transaction actually does allow reading, but reads go straight to the

[jsbell, 2013/09/13 00:12:21]

Also note that duplicate writes are not consolidated, i.e. put(k1, v1); put(k1,
v2) results in extra work for leveldb.

[ericu, 2013/11/20 23:05:39]

Noted.  Perhaps I'll call it LevelDBUncachedTransaction.

+// database, ignoring any writes cached in write_batch_.
+// TODO(ericu): Rename to LevelDBSimpleTransaction.
 class LevelDBWriteOnlyTransaction {
  public:
   static scoped_ptr<LevelDBWriteOnlyTransaction> Create(LevelDBDatabase* db);
 
   ~LevelDBWriteOnlyTransaction();
+  void Put(const base::StringPiece& key, const std::string* value);
+  bool Get(const base::StringPiece& key, std::string* value, bool* found);
   void Remove(const base::StringPiece& key);
   bool Commit();
 
  private:
   explicit LevelDBWriteOnlyTransaction(LevelDBDatabase* db);
 
   LevelDBDatabase* db_;
   scoped_ptr<LevelDBWriteBatch> write_batch_;
   bool finished_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_TRANSACTION_H_