@Override
  public <T> T getSetting(String setting, T defaultValue) {
    return baseExtensionContext.getSetting(setting, defaultValue);
  }
An {@link ExtensionContext} that is able to override registered services
to provide job/service specific values.
portability-api-launcher/src/main/java/org/datatransferproject/api/launcher/DelegatingExtensionContext.java