code: AsteriskQueueMemberImpl getMemberByLocation(String location)
      {
          AsteriskQueueMemberImpl member;
          synchronized (members)
          {
              member = members.get(location);
          }
          if (member == null)
          {
              logger.error("Requested member at location " + location + " not found!");
          }
          return member;
      }
docs: Retrieves a member by its location.
  
  @param location of the member
  @return the requested member.