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https://issues.apache.org/jira/browse/TAP5-2383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14121247#comment-14121247
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Lance edited comment on TAP5-2383 at 9/4/14 11:20 AM:
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Chirs, I'm not sure how many times I can say this....
It's nice to think of a components internal zoneId's as being private. The
container should not need to know them. If the container (or another component)
is having to think about another container's zoneIds I consider this to be
tight coupling. This pub/sub mechanism is designed to decouple the components.
I've given a very simple example. Think of two deeply nested components inside
a complex hierarchy.
was (Author: uklance):
Chirs, I'm not sure how many times I can say this....
It's nice to think of a components internal zoneId's as being private. The
container should not need to know them. Having the container update zones in
the component is tight coupling. This pub/sub is designed to decouple the
components.
I've given a very simple example. Think of two deeply nested components inside
a complex hierarchy.
> 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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