Quoting Niclas Hedhman <[email protected]>:
On Wed, Jan 20, 2010 at 9:39 PM, Stanislav Muhametsin
<[email protected]> wrote:
@Mixins({MyEmptyInterface.MyLifecycleMixin.class})
Is this a bug or a feature?
It is a feature (which unfortunately bites you in the butt often). The
@Mixins annotation is NOT "put in these Mixins" but a list of "Here
are the Mixins that you can pick method implementations from". So, the
Composite interface is scanned for methods, and for each found method
it will look in the list of mixins and pick a method that is
compatible, and for each of the classes found the instantiation will
occur.
I assume this also happens when I want to implement Initializable interface
instead of Lifecycle, however I did not test this.
Yes, Initializable is checked upon instantiation of the Mixin.
Note that "methods" in my explanation also includes the methods of the
Private Mixin references, i.e.
@This
private Niclas mixin;
and can often help in the situations I think you are exploring.
I dug this email out from naphtaline, as I kinda run into a problem
with Lifecycle. I implemented the code example shown in Lifecycle's
javadoc (and fixed numerous typos and errors). I ran the test, and it
didn't call the create() method. As a consequence, it threw
ConstaintViolationException, as the admin() property was never set.
Then I search my mail folder and found this mail. Niclas mentioned
searching methods of private mixins, and I thought he meant to add
something like this into SystemAdminMixin:
@This private Dummy _dummy;
public static interface Dummy
{
public void dummy();
}
public static class DummyMixin
implements Dummy
{
public void dummy() {}
}
But, alas, it still didn't work. Even adding Lifecycle to
implementation list of DummyMixin didn't work. In fact, I could leave
out the whole DummyMixin from @Mixins-list of SystemEntity and Qi4j
runtime would still start up. It seems that it doesn't scan these
private mixins anymore?
Since I've misunderstood this issue before, I rather ask here first
than create JIRA issue. So, the question: how do I implement Lifecycle
functionality for role-interfaces, which are empty or have only
Property/Association/ManyAssociation methods?
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