code: private String buildConnectionDescription() {
  
        List<String> descList = Lists.newArrayListWithExpectedSize(4);
        for(ConnectionPoolSegment segment : segments) {
           String desc = segment.dbConnection.getConnectionDescription();
           if(!descList.contains(desc)) {
              descList.add(desc);
           }
        }
  
        return Joiner.on(',').join(descList);
     }
docs: Gets a description of the (real) database connection.
  @return The connection description.