code: public Map<String, Object> getDeadLetterExchangeArgs(final String exchange) {
          final Map<String, Object> args = Maps.newHashMapWithExpectedSize(1);
          args.put("x-dead-letter-exchange", exchange);
          return args;
      }
docs: Return the deadletter arguments.
  
  @param exchange
  the deadletter exchange
  @return map which holds the properties