content/browser/devtools/protocol/system_info_handler.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_BROWSER_DEVTOOLS_PROTOCOL_SYSTEM_INFO_HANDLER_H_
   6 #define CONTENT_BROWSER_DEVTOOLS_PROTOCOL_SYSTEM_INFO_HANDLER_H_
   7
   8 #include <set>
   9
  10 #include "content/browser/devtools/protocol/devtools_protocol_dispatcher.h"
  11 #include "content/public/browser/browser_thread.h"
  12 #include "content/public/browser/gpu_data_manager_observer.h"
  13
  14 namespace content {
  15 namespace devtools {
  16 namespace system_info {
  17
  18 class SystemInfoHandler {
  19  public:
  20   using Response = DevToolsProtocolClient::Response;
  21
  22   SystemInfoHandler();
  23   ~SystemInfoHandler();
  24
  25   void SetClient(scoped_ptr<Client> client);
  26
  27   Response GetInfo(DevToolsCommandId command_id);
  28
  29  private:
  30   friend class SystemInfoHandlerGpuObserver;
  31
  32   void SendGetInfoResponse(DevToolsCommandId command_id);
  33
  34   // Bookkeeping for the active GpuObservers.
  35   void AddActiveObserverId(int observer_id);
  36   bool RemoveActiveObserverId(int observer_id);
  37   void ObserverWatchdogCallback(int observer_id, DevToolsCommandId command_id);
  38
  39   // For robustness, we have to guarantee a response to getInfo requests.
  40   // It's very unlikely that the requests will time out. The
  41   // GpuDataManager's threading model is not well defined (see comments in
  42   // gpu_data_manager_impl.h) and it is very difficult to correctly clean
  43   // up its observers. For the moment, especially since these classes are
  44   // only used in tests, we leak a little bit of memory if we don't get a
  45   // callback from the GpuDataManager in time.
  46   mutable base::Lock lock_;
  47   std::set<int> active_observers_;
  48
  49   scoped_ptr<Client> client_;
  50   base::WeakPtrFactory<SystemInfoHandler> weak_factory_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(SystemInfoHandler);
  53 };
  54
  55 }  // namespace system_info
  56 }  // namespace devtools
  57 }  // namespace content
  58
  59 #endif  // CONTENT_BROWSER_DEVTOOLS_PROTOCOL_SYSTEM_INFO_HANDLER_H_