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table t : {A : int, Ch : channel string}
fun listener n ch =
s <- recv ch;
alert (show n ^ ": " ^ s);
listener n ch
fun speak id msg =
r <- oneRow (SELECT t.Ch FROM t WHERE t.A = {[id]});
send r.T.Ch msg
fun main () : transaction page =
ch1 <- channel;
dml (INSERT INTO t (A, Ch) VALUES (1, {[ch1]}));
ch2 <- channel;
dml (INSERT INTO t (A, Ch) VALUES (2, {[ch2]}));
s1 <- source "";
s2 <- source "";
return <xml><body onload={spawn (listener 1 ch1); spawn (listener 2 ch2)}>
1: <ctextbox source={s1}/><button onclick={msg <- get s1; speak 1 msg}/><br/>
2: <ctextbox source={s2}/><button onclick={msg <- get s2; speak 2 msg}/>
</body></xml>
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