wro4j-core/src/main/java/ro/isdc/wro/http/WroFilter.java
private WroManagerFactory createWroManagerFactory() {
    if (wroManagerFactory == null) {
      final WroManagerFactory managerFactoryAttribute = ServletContextAttributeHelper.create(filterConfig)
          .getManagerFactory();
      LOG.debug("managerFactory attribute: {}", managerFactoryAttribute);
      wroManagerFactory = managerFactoryAttribute != null ? managerFactoryAttribute : newWroManagerFactory();
    }
    LOG.debug("created managerFactory: {}", wroManagerFactory);
    return wroManagerFactory;
  }
private WroManagerFactory createWroManagerFactory() {
    if (wroManagerFactory == null) {
      final WroManagerFactory managerFactoryAttribute = ServletContextAttributeHelper.create(filterConfig)
          .getManagerFactory();
      LOG.debug("managerFactory attribute: {}", managerFactoryAttribute);
      wroManagerFactory = managerFactoryAttribute != null ? managerFactoryAttribute : newWroManagerFactory();
    }
    LOG.debug("created managerFactory: {}", wroManagerFactory);
    return wroManagerFactory;
  }
Creates {@link WroManagerFactory}.