DNR Prototype: With flatbuffers

extensions/browser/api/declarative_net_request/rules_monitor.h

+// Copyright 2017 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 EXTENSIONS_BROWSER_API_DECLARATIVE_NET_REQUEST_RULES_MONITOR_H_
+#define EXTENSIONS_BROWSER_API_DECLARATIVE_NET_REQUEST_RULES_MONITOR_H_
+
+#include "base/macros.h"
+#include "base/scoped_observer.h"
+#include "extensions/browser/extension_registry_observer.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace base {
+class SequencedTaskRunner;
+}
+
+namespace extensions {
+class InfoMap;
+
+namespace declarative_net_request {
+
+// Lives on the UI thread. TODO take care of incognito.
+// Owned by ExtensionSystem.
+class RulesMonitor : public ExtensionRegistryObserver {
+ public:
+  // TODO if needed change to Profile.
+  explicit RulesMonitor(content::BrowserContext* browser_context,
+                        base::SequencedTaskRunner* task_runner,
+                        InfoMap* info_map);
+  ~RulesMonitor() override;
+
+ private:
+  void OnExtensionLoaded(content::BrowserContext* browser_context,
+                         const Extension* extension) override;
+
+  void OnExtensionUnloaded(content::BrowserContext* browser_context,
+                           const Extension* extension,
+                           UnloadedExtensionReason reason) override;
+
+  // TODO listen to OnExtensionUninstalled to clear persisted ruleset for
+  // unpacked extensions? Won't be needed for packed extensions since the
+  // extension directory will be deleted.
+
+  // TODO do we need to store browser context?
+  content::BrowserContext* browser_context_;
+  ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
+      registry_observer_;
+
+  // Weak. Owned by ExtensionService. The events above are propogated through
+  // the ExtensionService, which means this weak reference is safe to use.
+  base::SequencedTaskRunner* file_task_runner_;
+
+  // Weak. Owned by ExtensionSystem, which also owns us. We use it in the
+  // OnExtension* events, which means the ExtensionService hasn't been shut down
+  // which means the ExtensionSystem hasn't been shutdown. Hence this is safe to
+  // use.
+  InfoMap* info_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(RulesMonitor);
+};
+
+}  // namespace declarative_net_request
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_API_DECLARATIVE_NET_REQUEST_RULES_MONITOR_H_