Ur/Web: tests/roundTrip.ur annotate

Some client-side error handling

author	Adam Chlipala <adamc@hcoop.net>
date	Thu, 16 Apr 2009 13:47:20 -0400
parents	2197f0e24a9f
children	8a169fc0838b

rev	line source
adamc@728	1 table channels : { Client : client, Channel : channel (string * int * float) }
adamc@728	2 PRIMARY KEY Client
adamc@728	3
adamc@728	4 fun writeBack v =
adamc@728	5 me <- self;
adamc@728	6 r <- oneRow (SELECT channels.Channel FROM channels WHERE channels.Client = {[me]});
adamc@728	7 send r.Channels.Channel v
adamc@728	8
adamc@728	9 fun main () =
adamc@728	10 me <- self;
adamc@728	11 ch <- channel;
adamc@728	12 dml (INSERT INTO channels (Client, Channel) VALUES ({[me]}, {[ch]}));
adamc@728	13
adamc@728	14 buf <- Buffer.create;
adamc@728	15
adamc@728	16 let
adamc@728	17 fun receiverA () =
adamc@728	18 v <- recv ch;
adamc@728	19 Buffer.write buf ("A:(" ^ v.1 ^ ", " ^ show v.2 ^ ", " ^ show v.3 ^ ")");
adamc@728	20 receiverA ()
adamc@728	21
adamc@728	22 fun receiverB () =
adamc@728	23 v <- recv ch;
adamc@728	24 Buffer.write buf ("B:(" ^ v.1 ^ ", " ^ show v.2 ^ ", " ^ show v.3 ^ ")");
adamc@728	25 error <xml>Bail out!</xml>;
adamc@728	26 receiverB ()
adamc@728	27
adamc@728	28 fun sender s n f =
adamc@729	29 sleep 2000;
adamc@728	30 writeBack (s, n, f);
adamc@728	31 sender (s ^ "!") (n + 1) (f + 1.23)
adamc@728	32 in
adamc@729	33 return <xml><body onload={onDisconnect (alert "Server booted me");
adamc@729	34 onConnectFail (alert "Connection failed");
adamc@729	35 onServerError (fn s => alert ("Server error: " ^ s));
adamc@729	36 spawn (receiverA ()); spawn (receiverB ()); sender "" 0 0.0}>
adamc@728	37 <dyn signal={Buffer.render buf}/>
adamc@728	38 </body></xml>
adamc@728	39 end

Mercurial > urweb