class Concurrent::SerializedExecutionDelegator

@see Concurrent::SerializedExecution
@see [SimpleDelegator](www.ruby-doc.org/stdlib-2.1.2/libdoc/delegate/rdoc/SimpleDelegator.html)
guarantees serialized execution of tasks.
A wrapper/delegator for any ‘ExecutorService` that

def initialize(executor) 

def initialize(executor)
  @executor   = executor
  @serializer = SerializedExecution.new
  super(executor)
end

def post(*args, &task)

@!macro executor_service_method_post 
def post(*args, &task)
  raise ArgumentError.new('no block given') unless block_given?
  return false unless running?
  @serializer.post(@executor, *args, &task)
end