Chrome Cloud Messaging

chrome/browser/extensions/api/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_INVALIDATION_HANDLER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_INVALIDATION_HANDLER_H_
+
+#include <map>
+#include <string>
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "google/cacheinvalidation/include/types.h"
+#include "sync/notifier/invalidation_util.h"
+#include "sync/notifier/sync_notifier_observer.h"
+
+namespace extensions {
+
+class InvalidationHandlerObserver;
+
+// Implements a listener for invalidations from Tango for app messaging.
+// TODO(dcheng): Are there threading requirements here? We probably need to run
+// on a certain thread.
+// TODO(dcheng): This name is probably too generic.
+class InvalidationHandler : public syncer::SyncNotifierObserver {
+ public:
+  explicit InvalidationHandler(InvalidationHandlerObserver* observer);
+  virtual ~InvalidationHandler();
+
+  void RegisterExtension(const std::string& id);
+  void UnregisterExtension(const std::string& id);
+
+  // SyncNotifierObserver implementation.
+  virtual void OnIncomingNotification(
+      const syncer::ObjectIdPayloadMap& id_payloads,
+      syncer::IncomingNotificationSource source) OVERRIDE;
+  virtual void OnNotificationsEnabled() OVERRIDE;
+  virtual void OnNotificationsDisabled(
+      syncer::NotificationsDisabledReason reason) OVERRIDE;
+
+ private:
+  struct InvalidationRecord {
+    // TODO(dcheng): Eventually we might store ack handles or something in here.
+    enum Status {
+      // TODO(dcheng): Better naming?
+      kUpToDate,
+      kNeedsAck,
+    };
+    Status status;
+  };
+  typedef std::map<invalidation::ObjectId,
+                   InvalidationRecord,
+                   syncer::ObjectIdLessThan> InvalidationRecordMap;
+
+  InvalidationHandlerObserver* observer_;
+  InvalidationRecordMap registered_entries_;
+
+  DISALLOW_COPY_AND_ASSIGN(InvalidationHandler);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_PUSH_MESSAGING_INVALIDATION_HANDLER_H_