docs: void addMember(AsteriskQueueMemberImpl member)
      {
          synchronized (members)
          {
              // Check if member already exists
              if (members.containsValue(member))
              {
                  return;
              }
              // If not, add the new member.
              logger.info("Adding new member to the queue " + getName() + ": " + member.toString());
              members.put(member.getLocation(), member);
          }
  
          fireMemberAdded(member);
      }