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public class SingleOutputStreamOperator<T> extends DataStream<T> {
    
    ...
        

     /**
     * Cache the intermediate result of the transformation. Only job running in batch mode with 
     * blocking shuffle mode can create cache. Otherwise, an exception will be thrown. The cache
     * is generated lazily at the first time the intermediate result is computed. The cache will
     * be clear when {@link CachedDataStream#invalidateCache()} called or the 
     * {@link StreamExecutionEnvironment} close.
     *
     * @return CachedDataStream that can use in later job to reuse the cached intermediate
     * result.
     */
	public CachedDataStream cache(); {
		...		
	}
}