dbus: Make Bus::GetManagedObjects skip unavailable services.

dbus/object_manager.h

 // Copyright (c) 2013 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 DBUS_OBJECT_MANAGER_H_
 #define DBUS_OBJECT_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 127 matching lines @@
 class CHROME_DBUS_EXPORT ObjectManager
     : public base::RefCountedThreadSafe<ObjectManager> {
 public:
   // ObjectManager::Interface must be implemented by any class wishing to have
   // its remote objects managed by an ObjectManager.
   class Interface {
    public:
     virtual ~Interface() {}
 
     // Called by ObjectManager to create a Properties structure for the remote
-    // D-Bus object identified by |object_path| and accessibile through
+    // D-Bus object identified by |object_path| and accessible through
     // |object_proxy|. The D-Bus interface name |interface_name| is that passed
     // to RegisterInterface() by the implementation class.
     //
     // The implementation class should create and return an instance of its own
     // subclass of dbus::PropertySet; ObjectManager will then connect signals
     // and update the properties from its own internal message reader.
     virtual PropertySet* CreateProperties(
         ObjectProxy *object_proxy,
         const dbus::ObjectPath& object_path,
         const std::string& interface_name) = 0;
@@ skipping 60 matching lines @@
   // cast the returned pointer to the appropriate type, e.g.:
   //   static_cast<Properties*>(GetProperties(object_path, my_interface));
   PropertySet* GetProperties(const ObjectPath& object_path,
                              const std::string& interface_name);
 
   // Instructs the object manager to refresh its list of managed objects;
   // automatically called by the D-Bus thread manager, there should never be
   // a need to call this manually.
   void GetManagedObjects();
 
+  // Returns true if the service providing this object is currently available
+  // (i.e. its name has an owner).
+  bool ServiceIsAvailable();
+
   // Cleans up any match rules and filter functions added by this ObjectManager.
   // The Bus object will take care of this so you don't have to do it manually.
   //
   // BLOCKING CALL.
   void CleanUp();
 
  protected:
   virtual ~ObjectManager();
 
  private:
@@ skipping 116 matching lines @@
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<ObjectManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectManager);
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_OBJECT_MANAGER_H_