code: public Set<String> getActivitiesWithDataUsage() {
          Set<String> result = new HashSet<>();
          String propertyValue = getProperty(ProcessContextProperty.ACTIVITIES_WITH_DATA_USAGE);
          if (propertyValue == null) {
              return result;
          }
          StringTokenizer activityTokens = StringUtils.splitArrayString(propertyValue, " ");
          while (activityTokens.hasMoreTokens()) {
              result.add(activityTokens.nextToken());
          }
          return result;
      }
docs: Returns the names of all activities with data usage.
  
  @return A set of all activities with data usage.