question: public static DiscCacheAware createReserveDiscCache ( File cacheDir ) { File individualDir = new File ( cacheDir , "uil-images" ) ; if ( individualDir . exists ( ) || individualDir . mkdir ( ) ) { cacheDir = individualDir ; } return new TotalSizeLimitedDiscCache ( cacheDir , 2 * 1024 * 1024 ) ; }
target:  Creates reserve disc cache which will be used if primary disc cache becomes unavailable 