def Install()

in ambari-metrics-timelineservice/src/main/python/embedded_hbase_service.py [0:0]
51 lines of code
5 McCabe index (conditional complexity)

  def Install(cls, startupMode = "auto", username = None, password = None):
    print("Installing service %s" % (cls._svc_name_))

    # Configure master.xml, which drives the java subprocess32
    java_path = get_java_exe_path()
    java_args = _build_master_java_args(username)

    config_file_path = _get_config_file_path()

    xmlFileContents = _MasterXml()
    xmlFileContents.service.id = EMBEDDED_HBASE_MASTER_SERVICE
    xmlFileContents.service.name = EMBEDDED_HBASE_MASTER_SERVICE
    xmlFileContents.service.description = "This service runs " + EMBEDDED_HBASE_MASTER_SERVICE
    xmlFileContents.service.executable = java_path
    xmlFileContents.service.arguments = java_args

    xmlFile = open(config_file_path, "w")
    xmlFile.write( str(xmlFileContents) )
    xmlFile.close()

    startType = cls._get_start_type(startupMode)
    serviceType = win32service.SERVICE_WIN32_OWN_PROCESS
    errorControl = win32service.SERVICE_ERROR_NORMAL

    commandLine = os.path.abspath(cls._exe_name_)
    hscm = win32service.OpenSCManager(None,None,win32service.SC_MANAGER_ALL_ACCESS)
    try:
      try:
        hs = win32service.CreateService(hscm,
                                        cls._svc_name_,
                                        cls._svc_display_name_,
                                        win32service.SERVICE_ALL_ACCESS,         # desired access
                                        serviceType,        # service type
                                        startType,
                                        errorControl,       # error control type
                                        commandLine,
                                        None,
                                        0,
                                        None,
                                        username,
                                        password)
        print("Service installed")
        win32service.CloseServiceHandle(hs)
      finally:
        win32service.CloseServiceHandle(hscm)
    except win32service.error as exc:
      if exc.winerror==winerror.ERROR_SERVICE_EXISTS:
        cls.Update(username, password)
      else:
        print("Error installing service: %s (%d)" % (exc.strerror, exc.winerror))
        err = exc.winerror
    except ValueError as msg: # Can be raised by custom option handler.
      print("Error installing service: %s" % str(msg))
      err = -1
      # xxx - maybe I should remove after _any_ failed install - however,
      # xxx - it may be useful to help debug to leave the service as it failed.
      # xxx - We really _must_ remove as per the comments above...
      # As we failed here, remove the service, so the next installation
      # attempt works.
      try:
        RemoveService(cls._svc_name_)
      except win32api.error:
        print("Warning - could not remove the partially installed service.")