/guava/guava/src/com/google/common/cache/ForwardingCache.java
delegate( ).cleanUp( ) ;delegate( ).invalidateAll( keys) ;
delegate ( ) .invalidateAll ( keys ) ;
@Override public void invalidate(Object key) { delegate().invalidate(key); } @Override public void invalidateAll(Iterable<? extends Object> keys) { <extra_id_0> } @Override public void invalidateAll() { delegate().invalidateAll(); } @Override