question: @ Override public RES next ( REQ req ) { writeTraceLog ( req , middlewareName ) ; if ( predicate . test ( req ) ) { RES res = middleware . handle ( req , next ) ; writeTraceLog ( res , middlewareName ) ; return res ; } else if ( next != null ) { RES res = ( RES ) next . next ( req ) ; writeTraceLog ( res , middlewareName ) ; return res ; } else { return null ; } }
target:  Dispatches a request to the next chain of middleware.