1 files changed, 29 insertions, 0 deletions
diff --git a/demo/roundTrip.ur b/demo/roundTrip.ur
new file mode 100644
index 00000000..a2be8083
--- /dev/null
+++ b/demo/roundTrip.ur
@@ -0,0 +1,29 @@
+table channels : { Client : client, Channel : channel (string * int * float) }
+
+fun writeBack v =
+    me <- self;
+    r <- oneRow (SELECT channels.Channel FROM channels WHERE channels.Client = {[me]});
+    send r.Channels.Channel v
+
+fun main () =
+    me <- self;
+    ch <- channel;
+    dml (INSERT INTO channels (Client, Channel) VALUES ({[me]}, {[ch]}));
+    
+    buf <- Buffer.create;
+
+    let
+        fun receiver () =
+            v <- recv ch;
+            Buffer.write buf ("(" ^ v.1 ^ ", " ^ show v.2 ^ ", " ^ show v.3 ^ ")");
+            receiver ()
+
+        fun sender s n f =
+            sleep 2000;
+            writeBack (s, n, f);
+            sender (s ^ "!") (n + 1) (f + 1.23)
+    in
+        return <xml><body onload={spawn (receiver ()); sender "" 0 0.0}>
+          <dyn signal={Buffer.render buf}/>
+        </body></xml>
+    end