How to update grid from server-side

[garyfisher]

Hi,

I hope this is not a FAQ. But I haven't found a solution for that.

How do I update a grid when a new item is ready on the server? I have a long running process and I'd like to display live results.

Thanks,
Gary

[Isomorphic]

See DataSource.updateCaches().

[garyfisher]

Thanks for a quick reply. But I'm new to SmartGWT and I'm not sure how to call this method on a server-side. I'm still confused where to work with a client data source and where with a server one.

I've just tried a Spring-based server-side job regularly updating a grid. So how should I call the updateCaches() from such a server job?

Thank you.

[Isomorphic]

Start by reading the QuickStart Guide, especially the Server Framework chapter, to gain an understanding of the client and server parts of SmartGWT.

[garyfisher]

I've read that. But now I need some help how to call this method. So is it possible to cal it from a server? Do you have some example?

[Isomorphic]

You've provided too little information to suggest a general approach, but you should look at the server-side API DSResponse.addRelatedUpdates().

[garyfisher]

If I understand correctly I have to have a client request first to use DSResponse.addRelatedUpdates(). But I have a different use-case. I just need to update a grid let's say every 10 seconds (or every time the server has a new row).

[garyfisher]

Should I use the com.google.gwt.user.client.Timer class to poll the server or is there a better way?

[Isomorphic]

Polling is one approach and is usually the best approach if immediate delivery is not important.

When you need low-latency deliver, SmartGWT offers the Real-Time Messaging module as well (see smartclient.com/product), which does server push. You could also use some kind of third-party server-push approach.