code: public static Grid getInstance(String configFile, String propertiesFile) throws InterruptedException {
          return getInstance(configFile == null ? null : new FileSystemResource(configFile), propertiesFile);
      }
docs: Retrieves the grid instance, as defined in the given configuration file.
  
  @param configFile The name of the configuration file containing the grid definition.
  @param propertiesFile The name of the properties file containing the grid's properties. You may, of course use Spring's {@code <context:property-placeholder location="classpath:com/foo/bar.properties"/>}
  but this parameter is helpful when you want to use the same xml configuration with different properties for different
  instances.
  @return The grid instance.