class_docstr: A container that houses all configurations and services for the application runtime.
  
  @see https://symfony.com/doc/current/service_container.html
class_docstr_tok: ["A","container","that","houses","all","configurations","and","services","for","the","application","runtime",".","@","see","https",":","\/\/symfony.com\/doc\/current\/service_container.html"]
docstr: Returns a service
  
  All instances of a unique service id are singleton.
docstr_tok: ["Returns","a","service","All","instances","of","a","unique","service","id","are","singleton","."]
code: def get(self, service_id):
      """Returns a service
  
      All instances of a unique service id are singleton.
      """
      if service_id not in self._services:
          self._services[service_id] = self._instantiate(service_id)
      return self._services[service_id]
  
file_path: streamalert/streamalert/scheduled_queries/container/container.py
label_desc: Use image node_id 2 for calling the ServiceContainer obj's underlying member method code with example usage: obj.get(service_id) and returns: self