[IndexedDB] Propogating changes to observers : Renderer

content/browser/indexed_db/indexed_db_observer_changes.h

+// Copyright 2016 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.
+
+// This class holds all observed operations of a transaction corresponding to a
+// single connection.
+
+#ifndef CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_OBSERVER_CHANGES_H_
+#define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_OBSERVER_CHANGES_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <map>
+#include <set>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/stl_util.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class IndexedDBObservation;
+
+class CONTENT_EXPORT IndexedDBObserverChanges {
+ public:
+  IndexedDBObserverChanges();
+  ~IndexedDBObserverChanges();
+
+  void RecordObserverForLastObservation(int32_t observer_id);
+  void AddObservation(std::unique_ptr<IndexedDBObservation> observation);
+
+  const std::map<int32_t, std::vector<int32_t>>& observation_index() {
+    return observation_index_;
+  }
+  // TODO(palakj): Can I return const here.
+  std::vector<std::unique_ptr<IndexedDBObservation>>& observations() {
+    return observations_;
+  }
+
+ private:
+  // map observer_id to corresponding set of indices in observations.
+  std::map<int32_t, std::vector<int32_t>> observation_index_;
+  std::vector<std::unique_ptr<IndexedDBObservation>> observations_;
+
+  DISALLOW_COPY_AND_ASSIGN(IndexedDBObserverChanges);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_OBSERVER_CHANGES_H_