GWT - Send a message from the server to the client?

[Joshua Godi]

Good afternoon,

I was curious how I would properly send a message from the server to the client? Here is my scenario:

Client A - Modifies User1 from the GUI and pushes the data to the server

Client B - Is looking at User1 and needs to be notified that there are changes that have been made

So the server needs to send a message to all clients that the user has changed.

What is the best way to solve this?

Thanks,

Joshua

[Timothy Spear]

Google gwteventservice.

Tim

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[Stevko]

There are several ways I've managed to do push messages to the client:

If you are using appengine, research the Channel api
https://developers.google.com/appengine/docs/java/channel/

If you have access to an MQ server (like ActiveMQ), consider using a JMS/STOMP/WebSocket protocol stack
http://blog.furiousbob.com/2011/03/20/receiving-jms-gwt/

as per Timothy, gwteventservice using the Comet method of pushing messages to the client.

I've refactored MVP applications designed to use GWT RPC, consolidated the Async callback code into a bona fide Model layer injected into the presenter layer, and then replaced the Model layer with an async protocol stack that communicates via jms/websocket to push updates to the presenter/client component.

[Andrea Boscolo]

I'd use http://errai.github.io/ and its bus.

[Joshua Godi]

Do you have any examples that you have done? Been having a hard time trying to just use the event bus portion.