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https://issues.apache.org/jira/browse/TAP5-2383?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14121188#comment-14121188
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Lance edited comment on TAP5-2383 at 9/4/14 10:11 AM:
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Dmitry's questions:
{quote}You can have {{<t:eventLink t:id="myEvent">}}... that will trigger the
same event handler. Now, how this event will be handled, using bubbling or
publishing{quote}
As I said, I'm suggesting these events are a new type of event. So eventlink
will never fire @Subscribe event handlers.
Note that publish event handlers will never return anything and will always be
void. So using existing event handlers is a bad fit (you can always have one
call the other if you wish).
{quote}ComponentResources only knows about parent/child component relations of
specific page relative to current component.{quote}
Correct, ComponentResources only knows about the current page. My whole idea is
that pub/sub happens within a single page. A page will never publish to another
page since we are only ever generating a response for a single page.
I see that Page as the PubSubHub!
was (Author: uklance):
Dmitry's questions:
{quote}You can have {{<t:eventLink t:id="myEvent">}}... that will trigger the
same event handler. Now, how this event will be handled, using bubbling or
publishing{quote}
As I said, I'm suggesting these events are a new type of event. So eventlink
will never fire @Subscribe event handlers.
Note that publish event handlers will never return anything and will always be
void. So using existing event handlers is a bad fit (you can always have one
call the other if you wish).
{quote}it doesn't feel right to have publish method on ComponentResources,
because it only knows about parent/child component relations of specific page
relative to current component.{quote}
Correct, ComponentResources only knows about the current page. My whole idea is
that pub/sub happens within a single page. A page will never publish to another
page since we are only ever generating a response for a single page.
I see that Page as the PubSubHub!
> 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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