Re: Server Push

Which of these can be used with App Engine or is GAE channel api is the only possible way?

On Thursday, November 6, 2014 12:09:05 PM UTC-8, Peter Donald wrote:

Hi,

On Thu, Nov 6, 2014 at 12:07 AM, Marcel K <marcel...@gmail.com> wrote:

Which framework for Server Push do you recommend, since Atmosphere doesn't seem to work with GWT 2.7.0?

It sort of depends on your environment and what your underlying platform supports. Below is a response I made to another similar question on the mailing list.

In short if you can use latest JEE or jersey then I would recommend that you use 

* built-in web sockets (https://github.com/realityforge/gwt-websockets-example/blob/master/src/main/java/org/realityforge/gwt/websockets/example/server/ChatServer.java)

* addon support for EventSource/ServerSent events (https://github.com/realityforge/gwt-eventsource-example/blob/master/src/main/java/org/realityforge/gwt/eventsource/example/server/)

* Servlet 3 async services for long polling (https://github.com/realityforge/gwt-webpoller-example/tree/master/src/main/java/org/realityforge/gwt/webpoller/example/server)

We use all three in our server push apps with GWT clients.

HTH 

On Fri, Oct 31, 2014 at 5:22 AM, Peter Donald <pe...@realityforge.org> wrote:

Hi,

We have built several systems like this where we want to push data to clients from the server. The client is responsible for subscribing to a channel possibly with filters in place. Rather than use GWT-RPC we have tended to move to using raw messages that are typically json blobs. We have used 4 basic strategies depending on the clients supported and the application requirements. The strategies are;

1. WebSockets
2. Server-Sent Events
3. Long polling
4. Periodic Polling

I had a poke around and found a good stack overflow answer to this (See [1])

When we faced the same issues, we ended up putting together a couple of libraries to help with in GWT.

* websockets: https://github.com/realityforge/gwt-websockets
* Server-sent Events: https://github.com/realityforge/gwt-eventsource
* Polling: https://github.com/realityforge/gwt-webpoller (Warning this
API is not yet at 1.0 status)

The tricky part is actually managing the channels and messages sequencing in each channel but we never got arounf to releasing our code for that part of the problem.

HTH

[1] http://stackoverflow.com/questions/11077857/what-are-long-polling-websockets-server-sent-events-sse-and-comet

--

Cheers,

Peter Donald

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