content/child/notifications/notification_dispatcher.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_DISPATCHER_H_
   6 #define CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_DISPATCHER_H_
   7
   8 #include <map>
   9
  10 #include "base/synchronization/lock.h"
  11 #include "content/child/worker_thread_message_filter.h"
  12
  13 namespace content {
  14
  15 class NotificationDispatcher : public WorkerThreadMessageFilter {
  16  public:
  17   explicit NotificationDispatcher(ThreadSafeSender* thread_safe_sender);
  18
  19   // Generates a, process-unique new notification Id mapped to |thread_id|, and
  20   // return the notification Id. This method can be called on any thread.
  21   int GenerateNotificationId(int thread_id);
  22
  23  protected:
  24   ~NotificationDispatcher() override;
  25
  26  private:
  27   // WorkerThreadMessageFilter:
  28   bool ShouldHandleMessage(const IPC::Message& msg) const override;
  29   void OnFilteredMessageReceived(const IPC::Message& msg) override;
  30   bool GetWorkerThreadIdForMessage(const IPC::Message& msg,
  31                                    int* ipc_thread_id) override;
  32
  33   using NotificationIdToThreadId = std::map<int, int>;
  34
  35   base::Lock notification_id_map_lock_;
  36   NotificationIdToThreadId notification_id_map_;
  37   int next_notification_id_ = 0;
  38
  39   DISALLOW_COPY_AND_ASSIGN(NotificationDispatcher);
  40 };
  41
  42 }  // namespace content
  43
  44 #endif  // CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_DISPATCHER_H_