code: public IClientBroadcastStream newBroadcastStream(Number streamId) {
          if (isValidStreamId(streamId)) {
              // get ClientBroadcastStream defined as a prototype in red5-common.xml
              ClientBroadcastStream cbs = (ClientBroadcastStream) scope.getContext().getBean("clientBroadcastStream");
              customizeStream(streamId, cbs);
              if (!registerStream(cbs)) {
                  cbs = null;
              }
              return cbs;
          }
          return null;
      }
docs: {@inheritDoc}