forms process context entry

def managed_context_entry(process_name,
                          classname,
                          token,
                          time_qualifier,
                          trigger_frequency='every 60',
                          state_machine_name=STATE_MACHINE_DISCRETE,
                          is_on=True,
                          exchange=EXCHANGE_MANAGED_WORKER,
                          blocking_type=BLOCKING_NORMAL,
                          present_on_boxes=None,
                          time_grouping=1,
                          arguments=None,
                          queue=None,
                          routing=None,
                          source=None,
                          sink=None,
                          pid_file=None,
                          log_file=None):
    """ forms process context entry """
    _ROUTING_PREFIX = 'routing_'
    _QUEUE_PREFIX = 'queue_'

    if arguments is not None:
        assert isinstance(arguments, dict)

    process_entry = ManagedProcessEntry(
        process_name=process_name,
        trigger_frequency=trigger_frequency,
        state_machine_name=state_machine_name,
        is_on=is_on,
        blocking_type=blocking_type,
        classname=classname,
        token=token,
        source=source,
        sink=sink,
        mq_queue=queue if queue is not None else _QUEUE_PREFIX + token + time_qualifier,
        mq_routing_key=routing if routing is not None else _ROUTING_PREFIX + token + time_qualifier,
        mq_exchange=exchange,
        present_on_boxes=present_on_boxes,
        arguments=arguments if arguments is not None else dict(),
        time_qualifier=time_qualifier,
        time_grouping=time_grouping,
        log_filename=log_file if log_file is not None else token + time_qualifier + '.log',
        pid_filename=pid_file if pid_file is not None else token + time_qualifier + '.pid')
    return process_entry