Add methods to process the refesh action for a PhysicalSwitch

app/models/physical_switch.rb

@@ -3,4 +3,23 @@ class PhysicalSwitch < Switch
   has_one :hardware, :dependent => :destroy, :foreign_key => :switch_id, :inverse_of => :physical_switch
 
   belongs_to :ext_management_system, :foreign_key => :ems_id, :inverse_of => :physical_switches
+
+  def my_zone
+    ems = ext_management_system
+    ems ? ems.my_zone : MiqServer.my_zone
+  end
+
+  def refresh_ems
+    unless ext_management_system
+      raise _("No Provider defined")
+    end
+    unless ext_management_system.has_credentials?
+      raise _("No Provider credentials defined")
+    end
+    unless ext_management_system.authentication_status_ok?
+      raise _("Provider failed last authentication check")
+    end
+
+    EmsRefresh.queue_refresh(ext_management_system)
+  end
 end