IDBObserver: Lifetime Management: Adding Observer

content/browser/indexed_db/indexed_db_database.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_DATABASE_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 20 matching lines @@
 
 namespace content {
 
 class IndexedDBBlobInfo;
 class IndexedDBConnection;
 class IndexedDBDatabaseCallbacks;
 class IndexedDBFactory;
 class IndexedDBKey;
 class IndexedDBKeyPath;
 class IndexedDBKeyRange;
+class IndexedDBObserver;
 class IndexedDBTransaction;
 struct IndexedDBValue;
 
 class CONTENT_EXPORT IndexedDBDatabase
     : NON_EXPORTED_BASE(public base::RefCounted<IndexedDBDatabase>) {
  public:
   // An index and corresponding set of keys
   using IndexKeys = std::pair<int64_t, std::vector<IndexedDBKey>>;
 
   // Identifier is pair of (origin, database name).
   using Identifier = std::pair<url::Origin, base::string16>;
 
+  std::vector<std::unique_ptr<IndexedDBObserver>> active_observers_;

[dmurph, 2016/06/15 12:49:43]

we'll want a map here of unique id -> observer so we can easily remove as well.

Generate the unique ID as outlined below.

[palakj1, 2016/06/16 07:05:40]

Done.

+
   static const int64_t kInvalidId = 0;
   static const int64_t kMinimumIndexId = 30;
 
   static scoped_refptr<IndexedDBDatabase> Create(
       const base::string16& name,
       IndexedDBBackingStore* backing_store,
       IndexedDBFactory* factory,
       const Identifier& unique_identifier,
       leveldb::Status* s);
 
@@ skipping 54 matching lines @@
   const IndexedDBTransactionCoordinator& transaction_coordinator() const {
     return transaction_coordinator_;
   }
 
   void TransactionCreated(IndexedDBTransaction* transaction);
   void TransactionFinished(IndexedDBTransaction* transaction, bool committed);
 
   // Called by transactions to report failure committing to the backing store.
   void TransactionCommitFailed(const leveldb::Status& status);
 
+  void Observe(int64_t transaction_id, int64_t observer_id);
+
   void Get(int64_t transaction_id,
            int64_t object_store_id,
            int64_t index_id,
            std::unique_ptr<IndexedDBKeyRange> key_range,
            bool key_only,
            scoped_refptr<IndexedDBCallbacks> callbacks);
   void GetAll(int64_t transaction_id,
               int64_t object_store_id,
               int64_t index_id,
               std::unique_ptr<IndexedDBKeyRange> key_range,
@@ skipping 175 matching lines @@
 
   ConnectionSet connections_;
   bool experimental_web_platform_features_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDatabase);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_DATABASE_H_