code: public ISingleItemSubscriberStream newSingleItemSubscriberStream(Number streamId) {
          if (isValidStreamId(streamId)) {
              // get SingleItemSubscriberStream defined as a prototype in red5-common.xml
              SingleItemSubscriberStream siss = (SingleItemSubscriberStream) scope.getContext().getBean("singleItemSubscriberStream");
              customizeStream(streamId, siss);
              if (!registerStream(siss)) {
                  siss = null;
              }
              return siss;
          }
          return null;
      }
docs: {@inheritDoc}