code: private String fetchOfferings() {
          DiscovererFetchallResult allOfferings = null;
          try {
              String discovererOutput = discovererClient.getRequest("fetch_all", Collections.EMPTY_LIST);
              ObjectMapper mapper = new ObjectMapper();
              allOfferings = mapper.readValue(discovererOutput, DiscovererFetchallResult.class);
          } catch (IOException e) {
              e.printStackTrace();
          }
          String offerings = allOfferings.offering;
  
          return offerings;
      }
docs: Fetches the list offerings from the Discoverer
  
  @return the String containing a unique Tosca representation of all available offerings