code: public void onMessage(String sessionId, ByteBuffer buffer) {
          WebSocketSession session = WsonrpcRemotes.getSession(sessionId);
          byte[] bytes = buffer.array();
          WsonrpcSessions.begin(session);
          try {
              fireMessage(sessionId, bytes);
              wsonrpcControl.handle(session, bytes);
          } catch (Exception ex) {
              onError(session.getId(), ex);
          } finally {
              WsonrpcSessions.end();
          }
      }
docs: 收到Client端发来的数据
  @param sessionId
  @param buffer