function getServiceById(id) {
  return this.stateManager.get('serviceById', id);
}
@public
@description Get service by its id.
@param {string} id - Id of the service to get.
@returns {object} Return the service or null if not present.
@example
service.getServiceById('99dc10bb-14ab-49dc-bd11-f724e98fc97c');