code: @Override
      public RTMPConnection getConnectionBySessionId(String sessionId) {
          log.debug("Getting connection by session id: {}", sessionId);
          if (connMap.containsKey(sessionId)) {
              return connMap.get(sessionId);
          } else {
              log.warn("Connection not found for {}", sessionId);
              if (log.isTraceEnabled()) {
                  log.trace("Connections ({}) {}", connMap.size(), connMap.values());
              }
          }
          return null;
      }
docs: Returns a connection for a given session id.
  
  @param sessionId
  @return connection if found and null otherwise