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https://issues.jboss.org/browse/CDI-4?page=com.atlassian.jira.plugin.syst...
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Jason Porter edited comment on CDI-4 at 5/8/11 5:10 PM:
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bq. Simply having say, a framework like Forge implement comparators, doesn't help
readability of the model at all. In fact, it sort of suffers from the same problem that
putting the configuration in an XML file suffers from: you can't get any sense of the
ordering just by looking at any given observer.
Yeah, that is one of the side effects of this idea.
Seems two issues we're be dealing with are
# adding to the signature of the observer, possibly making it harder to read with other
annotations
# externalizing ordering and not having any idea about ordering simply by looking at an
observer.
With a comparator, you could do what you wanted with the extra annotations, they simply
wouldn't be qualifying annotations, you could do the ordering in the comparator based
on those. Another option I just thought of (which is similar to the comparator idea) is to
make handling observers pluggable. Call it an EventingBus or something, it would be
another SPI that people could tie into and have (full ?) control over how eventing
happens, ordering, injection points, etc. This idea would allow us to do what we wanted in
Seam JMS (not sure if this has come up in CODI) where we need the metadata of the event
that was fired. It would be more work for the end user should they decide to take it, but
it really gives them control over the application, and the environment should they need
it.
Sorry for the first post which wasn't complete, Save and preview were a little too
close :)
was (Author: lightguard):
bq. Simply having say, a framework like Forge implement comparators, doesn't help
readability of the model at all. In fact, it sort of suffers from the same problem that
putting the configuration in an XML file suffers from: you can't get any sense of the
ordering just by looking at any given observer.
Yeah, that is one of the side effects of this idea. Seems the two issues we'll be
dealing with are
1. ao
Need a way to provide ordering for Event observers (@Observes)
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Key: CDI-4
URL:
https://issues.jboss.org/browse/CDI-4
Project: CDI Specification Issues
Issue Type: Feature Request
Components: Events, Portable Extensions
Affects Versions: 1.0
Environment: All
Reporter: Lincoln Baxter III
Assignee: Mike Brock
Fix For: TBD
There needs to be a way to specify some kind of ordering for Event observers.
Understandably, this is somewhat counter-intuitive to the general concept of observing an
event, but there is going to be need for this in an upcoming JBoss project. While it can
be done manually, it might be nice to have a built-in API.
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