Hi guys, I've been thinking about a "push" component for a while and I
thought I might make a start when I got some free time. I will be using an
abstraction on top of DWR's reverse ajax to achieve this.
Basically, it will look something like this:
ItemsComponent.tml
<div>
<t:zone t:id="zone" t:mixins="push" t:pushId="items-${user.id}"
t:pushEvent="doPush">
<t:loop source="items" item="item">${item.name}</t:loop>
</t:zone>
</div>
public class ItemsComponent {
@Property
private List<Item> items;
@Property
private Item item;
@SessionState
@Property
private User user;
@InjectComponent
private Zone zone;
public Block doPush(List<Item> context) {
this.items = context;
return zone.getBody();
}
}
And at some point, an asynchronous process will call
PushService.doPush(Object pushId, Object pushContext) which will fire
"doPush" and update the zone.
As part of this, I will need to do the following FROM A NON WEB THREAD
1. Get a component / page instance (using a path/id I stored earlier)
2. Execute an event on the component / page instance
3. Get the resultant block and run it through tapestry's template engine
4. Use DWR's reverse ajax to update the zone with the html fragment.
A couple of questions:
5. The push mixin will be storing the pushId and pushEvent in DWR's
http://directwebremoting.org/dwr/javadoc/org/directwebremoting/ScriptSession.html
ScriptSession . I will also need a String which will allow me to lookup a
component / page at a later stage. Is there a component path that will
uniquely identify the component page / instance?
6. I *think* that DWR has a HTTPServletRequest and HTTPServletResponse that
I *might* be able to get a handle on for the push. Any ideas on how I would
lookup the page / component / component resources?
Cheers,
Lance.
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