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      1 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_DBUS_LIVENESS_SERVICE_PROVIDER_H_
      6 #define CHROME_BROWSER_CHROMEOS_DBUS_LIVENESS_SERVICE_PROVIDER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/compiler_specific.h"
     12 #include "base/memory/ref_counted.h"
     13 #include "base/memory/weak_ptr.h"
     14 #include "chrome/browser/chromeos/dbus/cros_dbus_service.h"
     15 #include "dbus/exported_object.h"
     16 
     17 namespace dbus {
     18 class MethodCall;
     19 class Response;
     20 }
     21 
     22 namespace chromeos {
     23 
     24 // This class exports a "CheckLiveness" D-Bus method that the session manager
     25 // calls periodically to confirm that Chrome's UI thread is responsive to D-Bus
     26 // messages.  It can be tested with the following command:
     27 //
     28 // % dbus-send --system --type=method_call --print-reply
     29 //     --dest=org.chromium.LibCrosService
     30 //     /org/chromium/LibCrosService
     31 //     org.chromium.LibCrosServiceInterface.CheckLiveness
     32 //
     33 // -> method return sender=:1.9 -> dest=:1.27 reply_serial=2
     34 //
     35 // (An empty response should be returned.)
     36 class LivenessServiceProvider
     37     : public CrosDBusService::ServiceProviderInterface {
     38  public:
     39   LivenessServiceProvider();
     40   virtual ~LivenessServiceProvider();
     41 
     42   // CrosDBusService::ServiceProviderInterface overrides:
     43   virtual void Start(
     44       scoped_refptr<dbus::ExportedObject> exported_object) OVERRIDE;
     45 
     46  private:
     47   // Called from ExportedObject when CheckLiveness() is exported as a D-Bus
     48   // method or failed to be exported.
     49   void OnExported(const std::string& interface_name,
     50                   const std::string& method_name,
     51                   bool success);
     52 
     53   // Called on UI thread in response to a D-Bus request.
     54   void CheckLiveness(dbus::MethodCall* method_call,
     55                      dbus::ExportedObject::ResponseSender response_sender);
     56 
     57   // Keep this last so that all weak pointers will be invalidated at the
     58   // beginning of destruction.
     59   base::WeakPtrFactory<LivenessServiceProvider> weak_ptr_factory_;
     60 
     61   DISALLOW_COPY_AND_ASSIGN(LivenessServiceProvider);
     62 };
     63 
     64 }  // namespace chromeos
     65 
     66 #endif  // CHROME_BROWSER_CHROMEOS_DBUS_LIVENESS_SERVICE_PROVIDER_H_
     67