Re: [jetty-user] questions on the asynch nio and does framework support it

Yes you should be able to do something like this if I follow your line
of thinking, take a look at jetty continuations for servlet 2.5 and
these sorts of async behaviors are built into servlet 3.0

http://wiki.eclipse.org/Jetty/Feature/Continuations

cheers and good luck :)

jesse

--
jesse mcconnell
[email protected]

http://webtide.com / http://intalio.com
(the folks behind jetty and cometd)



On Fri, Sep 9, 2011 at 10:11, Dean Hiller <[email protected]> wrote:
> We would like to do something like the below.  Is this possible with jetty
> and the nio implementation?
>
> doGet(ServletReq req, ServletResp servletResponse) {
>    noSqlDatabase.asynchRead(keys, new CallbackForRead(servletResponse));
> }
>
> CallbackForRead implements NoSqlReadCallback {
>     private ServletResponse resp;
>     public CallbackForRead(ServletResponse r) { resp = r; }
>     public void dataRead(Data data) {
>         String response = formResponse(data);
>         resp.write(response);
>     }
> }
>
> NOTE: The jetty thread that fed us the request RETURNS while we wait for a
> response from the nosql database or any external system for that matter.
> When we are fed back the response of data, we are on a different thread but
> want to feed the servlet response back into the ServletResponse object(ie.
> the socket for the client is still open even though the thread returned).
>
> Why?  Well, it turns out we can use 10x less servers in this model because
> existing threads can be used which eliminates alot of cost as we can use 1
> server instead of 10.  The 10x number varies greatly depending on the
> network latency to the back end system whether database or DNS....the more
> latency the 10x number can increase even more significantly but 1 computer
> instead of 10 is already a really nice savings $$$$$.
>
> thanks,
> Dean
>
>

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