Introduce IComponentOnInitializeListener for cross-cutting concerns
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Key: WICKET-3082
URL: https://issues.apache.org/jira/browse/WICKET-3082
Project: Wicket
Issue Type: New Feature
Components: wicket
Affects Versions: 1.4.12
Reporter: Sven Ludwig
I suggest the introduction of
org.apache.wicket.application.IComponentOnInitializeListener for
onInitialize-cross-cutting-concerns on Components. Such a listener should be
called for a Component right after the onInitialize Method of the Component has
been executed. I hope this has not been discussed already. I have not found any
such issues.
A use case: For implementing cross-cutting concerns in Wicket, there are
several Listeners that are called at various points during the life-cycle of a
Component. Such listeners as in Wicket 1.4.12 are
IComponentInstantiationListener, IComponentOnBeforeRenderListener,
IComponentOnAfterRenderListener. However, for adding a Validator to all
IValidateable Components of a certain type, non of the existing Listeners is
really a good option. IComponentInstantiationListener cannot successfully add a
Validator in general, because such a listener is executed before the member
variable validators in the FormComponent class is actually set to null during
instantiation. IComponentOnAfterRenderListener will obviously be to late. And
with IComponentOnBeforeRenderListener, the validator itself would (without
extra coding) be instantiated and added in each request, which would be an
unnecessary overhead.
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