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https://issues.apache.org/jira/browse/TAP5-2383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14121341#comment-14121341
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Lance edited comment on TAP5-2383 at 9/4/14 1:38 PM:
-----------------------------------------------------
Hi Geoff, I'm starting to see use cases where there's not enough info in the
event context on the server (as you have pointed out).
{code:xml}
<div>
<t:userInfoEditor user="currentUser" />
</div>
<div>
<t:loop source="messages" value="currentMessage" />
<t:avatar user="currentMessage.user" /> ${currentMessage.message}<br />
</t:loop>
</div>
{code}
In this case the context is just the user. But we need to update all
{{<t:avatar />}} in the loop. But we don't have the messages collection.
was (Author: uklance):
Hi Geoff, I'm starting to see use cases where there's not enough info in the
event context on the server.
{code:xml}
<div>
<t:userInfoEditor user="currentUser" />
</div>
<div>
<t:loop source="messages" value="currentMessage" />
<t:avatar user="currentMessage.user" /> ${currentMessage.message}<br />
</t:loop>
</div>
{code}
In this case the context is just the user. But we need to update all
{{<t:avatar />}} in the loop. But we don't have the messages collection.
> Serverside publish / subscribe mechanism
> ----------------------------------------
>
> Key: TAP5-2383
> URL: https://issues.apache.org/jira/browse/TAP5-2383
> Project: Tapestry 5
> Issue Type: New Feature
> Components: tapestry-core
> Reporter: Lance
> Priority: Minor
>
> In some cases, an event in one component should cause an action (eg ajax
> update) in another. When these components are siblings it sometimes gets
> tricky having to pass zone id's around and having one component update the
> other.
> It would be nice to decouple the components with a serverside pub/sub
> mechanism. Here's an initial brain dump on how it could work.
> {code:java}
> public class EditPersonComponent {
> @Parameter
> private Person person;
> @Inject
> private PersonDao personDao;
> @Inject
> private ComponentResources componentResources;
> // lets assume there's a form in the component which gets posted
> void onSuccessFromPersonForm() {
> personDao.save(person);
> componentResources.publish("personUpdated", person); // new method on
> ComponentResources
> }
> }
> {code}
> {code:java}
> public class SomeOtherComponent {
> @Inject
> private AjaxResponseRenderer ajaxResponseRenderer;
> @Property
> private Person person;
> @Inject
> private Zone personZone;
> // new subscribe annotation (and naming convention?)
> @Subscribe("personUpdated")
> void onPersonUpdatedPublished(Person person) {
> this.person = person;
> ajaxResponseRenderer.addRender(personZone);
> }
> }
> {code}
> If this change was made on ComponentResources, we should probably add the
> following to support invoking publish events on the client
> {code}
> Link ComponentResources.createPublishLink(String eventType, Object... context)
> {code}
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