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From "Nick Westgate (JIRA)" <...@tapestry.apache.org>
Subject [jira] Created: (TAPESTRY-1695) Handling of multiple onActivate methods could be improved.
Date Wed, 08 Aug 2007 10:16:59 GMT
Handling of multiple onActivate methods could be improved.
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                 Key: TAPESTRY-1695
                 URL: https://issues.apache.org/jira/browse/TAPESTRY-1695
             Project: Tapestry
          Issue Type: Improvement
          Components: tapestry-core
    Affects Versions: 5.0.5
            Reporter: Nick Westgate


The summary is vague because the docs don't yet cover this situation.
It seems reasonable to have need for something like:

    Object onActivate() { ... }

    void onActivate(int itemId) { ... }

The current event handling calls both these activate methods (the 0 parameters method first,
then others).
I see only two ways of dealing with this:

(1) Factor out common code and use a flag to avoid executing that code twice
(2) Replace the two activate methods with:

    Object onActivate(Object[] parameters) { ... }

Both options impose some fiddly responsibilities onto the developer.
Perhaps a resolution is already planned but here are some ideas:
- call only one event handler
- allow event handlers to short-circuit (return boolean/Boolean?)
- swallow coercion exceptions so other event handlers can be tried

Cheers,
Nick.

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