Plumb invalidations from Tango to the extensions code for the Push Messaging API.

chrome/browser/extensions/api/push_messaging/push_messaging_invalidation_handler.h

+// Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_PUSH_MESSAGING_INVALIDATION_HANDLER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_PUSH_MESSAGING_INVALIDATION_HANDLER_H_
+
+#include <set>
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/threading/thread_checker.h"
+#include "chrome/browser/extensions/api/push_messaging/push_messaging_invalidation_mapper.h"
+#include "sync/notifier/sync_notifier_observer.h"
+
+class InvalidationService;
+
+namespace extensions {
+
+class PushMessagingInvalidationHandlerObserver;

[Munjal (Google), 2012/08/14 18:56:37]

I am wondering if we should have a browser/push_messaging folder where we put
most of our push messaging code in a push_messaging namespace. This has two
benefits:
- Class names won't be very long.
- Most of the push messaging stuff can be in one place and then we will just
have a thin layer for extension event routing.

[dcheng, 2012/08/14 21:39:59]

That seems like a good idea. The class names are ridiculously long, since I
didn't feel comfortable putting generic names like "InvalidationHandler" into
the extensions namespace. I'd like to pursue that move in a separate patch
though.

+
+// This class maps extension IDs to the corresponding object IDs, manages
+// invalidation registrations, and dispatches callbacks for any invalidations
+// received.
+class PushMessagingInvalidationHandler : public PushMessagingInvalidationMapper,
+                                         public syncer::SyncNotifierObserver {
+ public:
+  // |service| and |observer| must remain valid for the lifetime of this object.
+  // |extension_ids| is the set of extension IDs for which push messaging is
+  // enabled.
+  PushMessagingInvalidationHandler(
+      InvalidationService* service,
+      PushMessagingInvalidationHandlerObserver* observer,
+      const std::set<std::string>& extension_ids);
+  virtual ~PushMessagingInvalidationHandler();
+
+  // PushMessagingInvalidationMapper implementation.
+  virtual void RegisterExtension(const std::string& extension_id) OVERRIDE;
+  virtual void UnregisterExtension(const std::string& extension_id) OVERRIDE;
+
+  // SyncNotifierObserver implementation.
+  virtual void OnNotificationsEnabled() OVERRIDE;
+  virtual void OnNotificationsDisabled(
+      syncer::NotificationsDisabledReason reason) OVERRIDE;
+  virtual void OnIncomingNotification(
+      const syncer::ObjectIdPayloadMap& id_payloads,
+      syncer::IncomingNotificationSource source) OVERRIDE;
+
+ private:
+  base::ThreadChecker thread_checker_;
+  InvalidationService* service_;
+  syncer::ObjectIdSet registered_ids_;
+  PushMessagingInvalidationHandlerObserver* observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(PushMessagingInvalidationHandler);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_PUSH_MESSAGING_INVALIDATION_HANDLER_H_