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From "Howard M. Lewis Ship (JIRA)" <j...@apache.org>
Subject [jira] Updated: (TAP5-852) Mechanism to initialize components and component fields without as much explicit code gen & injection
Date Wed, 23 Sep 2009 21:37:16 GMT

     [ https://issues.apache.org/jira/browse/TAP5-852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Howard M. Lewis Ship updated TAP5-852:
--------------------------------------

    Summary: Mechanism to initialize components and component fields without as much explicit
code gen & injection  (was: ClassTransformation.addInitialization())

> Mechanism to initialize components and component fields without as much explicit code
gen & injection
> -----------------------------------------------------------------------------------------------------
>
>                 Key: TAP5-852
>                 URL: https://issues.apache.org/jira/browse/TAP5-852
>             Project: Tapestry 5
>          Issue Type: New Feature
>          Components: tapestry-core
>            Reporter: Howard M. Lewis Ship
>
> It is very common to want to add some initialization to a component.
> Currently, it is necessary to inject dependencies and directly add code.
> It would be nice if there were new interfaces:
> interface ComponentInitializer {
>   void initializeComponent(ComponentResources resources);
> }
> interface ComponentFieldInitializer {
>   Object initializeComponentField(ComponentResources resources);
> }
> These could be paired up with methods in ClassTransformation:
> void addFieldInitialization(String fieldName, ComponentFieldInitializer initializer);
> void addInitialization(ComponentInitializer initializer);
> These methods would translate to code executed in the constructor of the component.
> This would simplify many of the existing component class transform workers.
> It also represents a way to start moving away from writing explicit code generation (using
Javassist psuedo-code) towards a more API driven approach that could eventually be implemented
using
> ASM or some other better supported toolkit.

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