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Tutorial: hyperlinks for metaprogramming and row types
author Adam Chlipala <adam@chlipala.net>
date Wed, 20 Jul 2011 08:14:49 -0400
parents 8a169fc0838b
children
rev   line source
adamc@728 1 table channels : { Client : client, Channel : channel (string * int * float) }
adamc@728 2 PRIMARY KEY Client
adamc@728 3
adam@1348 4 table dearlyDeparted : { Client : option client, When : time }
adam@1348 5
adam@1348 6 task clientLeaves = fn cli : client =>
adam@1348 7 dml (INSERT INTO dearlyDeparted (Client, When) VALUES ({[Some cli]}, CURRENT_TIMESTAMP));
adam@1348 8 debug "Our favorite client has LEFT!"
adam@1348 9
adamc@728 10 fun writeBack v =
adamc@728 11 me <- self;
adamc@728 12 r <- oneRow (SELECT channels.Channel FROM channels WHERE channels.Client = {[me]});
adamc@728 13 send r.Channels.Channel v
adamc@728 14
adam@1348 15 fun main' () =
adamc@728 16 me <- self;
adamc@728 17 ch <- channel;
adamc@728 18 dml (INSERT INTO channels (Client, Channel) VALUES ({[me]}, {[ch]}));
adamc@728 19
adamc@728 20 buf <- Buffer.create;
adamc@728 21
adamc@728 22 let
adamc@728 23 fun receiverA () =
adamc@728 24 v <- recv ch;
adamc@728 25 Buffer.write buf ("A:(" ^ v.1 ^ ", " ^ show v.2 ^ ", " ^ show v.3 ^ ")");
adamc@728 26 receiverA ()
adamc@728 27
adamc@728 28 fun receiverB () =
adamc@728 29 v <- recv ch;
adamc@728 30 Buffer.write buf ("B:(" ^ v.1 ^ ", " ^ show v.2 ^ ", " ^ show v.3 ^ ")");
adamc@728 31 error <xml>Bail out!</xml>;
adamc@728 32 receiverB ()
adamc@728 33
adamc@728 34 fun sender s n f =
adamc@729 35 sleep 2000;
adam@1348 36 rpc (writeBack (s, n, f));
adamc@728 37 sender (s ^ "!") (n + 1) (f + 1.23)
adamc@728 38 in
adamc@729 39 return <xml><body onload={onDisconnect (alert "Server booted me");
adamc@729 40 onConnectFail (alert "Connection failed");
adamc@729 41 onServerError (fn s => alert ("Server error: " ^ s));
adamc@729 42 spawn (receiverA ()); spawn (receiverB ()); sender "" 0 0.0}>
adamc@728 43 <dyn signal={Buffer.render buf}/>
adamc@728 44 </body></xml>
adamc@728 45 end
adam@1348 46
adam@1348 47 fun main () = return <xml><body><form><submit action={main'}/></form></body></xml>