[undertow-dev] SSE: testing time between events

[Stuart Douglas]

When you send you are blocking the IO thread, so the events don't
actually get put on the wire till the IO thread returns.

Stuart

On Tue, May 2, 2017 at 7:54 AM, Ryan Dewell <ryan at dewell.org> wrote:
> Playing around at the moment, and missing something about the threading
> situation as it pertains to sending events.
>
> In my ServerSentEventConnectionCallback:
>
> public void connected(ServerSentEventConnection connection, String
> lastEventId) {
> try {
>   for (int i = 0; i<10; i++){
>     connection.send("i="+i);
>     Thread.sleep(1000);
>   }
> } catch (Exception e) {
>   throw new RuntimeException(e);
> }
> }
>
> Sending events, with one second between each.
>
> I’d expect the time between events to be reflected in the browser / client.
> However what instead happens is all 10 events arrive within the same
> millisecond (nanoseconds apart according to Chrome console time).
>
> So I’m missing something here.  But I don’t see anything obvious.  For
> example, there is nothing like a “flush()” on ServerSentEventConnection that
> could be used after each event is sent.
>
> Ideas/guidance?
>
> Thanks!
>
> Ryan
>
>
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