apollo-client-config-data/src/main/java/com/ctrip/framework/apollo/config/data/importer/ApolloConfigDataLoader.java/ApolloConfigDataLoader/getBindHandler
class ApolloConfigDataLoader:  private BindHandler getBindHandler(ConfigDataLoaderContext context) {
    return context.getBootstrapContext().getOrElse(BindHandler.class, null);
  }