First thing first it depends how fast you want to poll your server for data. As you probably know the browser only allows you to have 2 connections ... You might run into issues if your polling again and again in seconds. We have something similar and decided to make our own ServiceManager class which uses 2 HTTPService instances and manages the concurrency for the 2 connections. So when you make a request the service manager schedules that request and when it has the service avalable is doing the request ... We are still using commands, but not delegates anymore. The HTTPService handles the results and parses the data through some unmarshaller classes into the model ... It is not the greatest separtion of concerns but since we are polling the hell out of the server we hit serveral tomeouts due to bad request schedulling ...
Traditionaly with cairngorm after you get the data dreom the server you populate the model and update the view through bindings. You can hav an message mechanism and trigger it directly form the model, or dispatching events handled by commands. As far as the indicator goes the same thing ... use a preloader with alternate set to true inside the message view or somewhere .... show when make request, hide when result or fault ... The topic is 2 large to tackle in 2 paragraphs but if you need further info senf a private msg ... Cheers, Claudiu ________________________________ From: Osman Ullah <[email protected]> To: [email protected] Sent: Tuesday, March 24, 2009 4:03:22 PM Subject: [flexcoders] Using cairngorm for "push" events I am using cairngorm on my current project and I have run into a couple issues which I am having trouble dealing with through Cairngorm. Hopefully someone can help. 1) I have an event loop which is polling my web service for events. Where would be the best place to run this event loop and what would be a good way of notifying the view to "do something"? There might be very little data, so it might be something like popping an alert or popping a toast notification. ..it's not something I can do through databinding and cairngorm seems to throw out the whole concept of the model notifying the view through events (this design decision is something I don't really understand). 2) I want to make a request, and show a loading indicator while the request is pending, and then show a confirmation with the result of hte request. Similar requests are being made in different parts of the application, but they all consist of making the request, showing a wait indicator, and then showing a confirmation. Again, some suggestions on how to handle this would be appreciated. Thanks
