# If not stated otherwise in this file or this component's license file the
# following copyright and licenses apply:
#
# Copyright 2020 RDK Management
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

## `event_addhandler(<~event> <~callable>)-><event handler>`
##
## adds an event handler to the specified event. returns an `<event handler>`
## which can be used to remove the handler from the event.
##
function(event_addhandler event handler)
  event("${event}")
  ans(event)

  event_handler("${handler}")
  ans(handler)

  ## then only append function 
  map_append_unique("${event}" handlers "${handler}")
 
  return(${handler})  
endfunction()

