Ur/Web: demo/roundTrip.ur annotate

Start of support for surviving database-server restarts, for Postgres

author	Adam Chlipala <adam@chlipala.net>
date	Sat, 17 Oct 2015 10:49:25 -0400
parents	ed06e25c70ef
children

rev	line source
adamc@698	1 table channels : { Client : client, Channel : channel (string * int * float) }
adamc@708	2 PRIMARY KEY Client
adamc@698	3
adamc@698	4 fun writeBack v =
adamc@698	5 me <- self;
adamc@698	6 r <- oneRow (SELECT channels.Channel FROM channels WHERE channels.Client = {[me]});
adamc@698	7 send r.Channels.Channel v
adamc@698	8
adamc@733	9 fun action () =
adamc@698	10 me <- self;
adamc@698	11 ch <- channel;
adamc@698	12 dml (INSERT INTO channels (Client, Channel) VALUES ({[me]}, {[ch]}));
adamc@698	13
adamc@698	14 buf <- Buffer.create;
adamc@698	15
adamc@698	16 let
adamc@698	17 fun receiver () =
adamc@698	18 v <- recv ch;
adamc@698	19 Buffer.write buf ("(" ^ v.1 ^ ", " ^ show v.2 ^ ", " ^ show v.3 ^ ")");
adamc@698	20 receiver ()
adamc@698	21
adamc@698	22 fun sender s n f =
adamc@698	23 sleep 2000;
adamc@908	24 rpc (writeBack (s, n, f));
adamc@698	25 sender (s ^ "!") (n + 1) (f + 1.23)
adamc@698	26 in
adamc@698	27 return <xml><body onload={spawn (receiver ()); sender "" 0 0.0}>
adamc@698	28 <dyn signal={Buffer.render buf}/>
adamc@698	29 </body></xml>
adamc@698	30 end
adamc@733	31
adamc@733	32 fun main () = return <xml><body>
adamc@733	33 <form><submit value="Begin demo" action={action}/></form>
adamc@733	34 </body></xml>

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