code: @Override
      public synchronized ChainGroupData getChainGroup(String groupName) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "getChainGroup: " + groupName);
          }
          if (null == groupName) {
              return null;
          }
          return this.chainGroups.get(groupName);
      }
docs: /*
  @see
  com.ibm.wsspi.channelfw.ChannelFramework#getChainGroup(java.lang.String)