Re: [jetty-users] Sending data over the server end of a WebSocket

[Erin Drummond <erin.dru@xxxxxxxxx>]

That was the WebSocket client I was using originally, but I used it as
a base and rewrote it using xSocket for my purposes. It actually
worked really well though.

In the server, you have to create a WebSocketServlet. It spawns
WebSocket objects which, when connected, have an Outbound object you
can use to send messages back to the client.

Details here: http://blogs.webtide.com/gregw/entry/jetty_websocket_server

On Mon, Jan 18, 2010 at 6:29 PM, go canal <gocanal@xxxxxxxxx> wrote:
> Hi,
> I also just started playing around with WebSocket. I have not tried more
> than 3kb.
> Sorry, I do not have answers for your questions. But rather, I have a couple
> of questions:
>  - which WebSocket java client library are you using ?
>     I find this : http://github.com/adamac/Java-WebSocket-client but have
> not tried it.
>  - I have a server supporting WebSocket and JMS; Anther program send data to
> the server using JMS; all clients connect to the server using WebSocket. In
> the server, how do I pass JMS messages to WebSocket ?
>
> rgds,
> canal
>
> ________________________________
> From: Erin Drummond <erin.dru@xxxxxxxxx>
> To: jetty-users@xxxxxxxxxxx
> Sent: Mon, January 18, 2010 10:56:44 AM
> Subject: [jetty-users] Sending data over the server end of a WebSocket
>
> Hi,
>
> I am trying to get communications between two Java programs using a
> Websocket. One has an embedded Jetty server running a WebSocketServlet
> instance, and the other has a java implementation of a WebSocket
> client.
>
> The client can connect to the server and send data, and the server can
> send data back to the client through the Outbound object. This works
> fine for messages smaller than 3 kilobytes.
>
> However, I would like to send messages much larger than that (they
> contain base64-encoded binary data). If I try and send a message
> larger than 3 kilobytes, I get:
> java.lang.IllegalArgumentException: frame too large
>         at
> org.eclipse.jetty.websocket.WebSocketGenerator.addFrame(WebSocketGenerator.java:91)
>
> Since the limit of a WebSocket frame seems to be 3kb, how can I break
> up a message and send it in multiple frames? Actually I dont really
> understand the frame thing very well, as you can specify any number
> for the frame (and the same number multiple times) and the message
> still reaches the other end in exactly the same way. In my
> understanding, a frame should be a "chunk" of data, but then why can
> the user specify a number for it? You'd think that the underlying
> network would take care of chunking up the data as it does for a
> standard TCP socket.
>
> Can somebody please help me?
>
> Cheers,
> Erin
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