[TYPO3-core] Signals vs. Hooks

[Philipp Gampe]

Hi Bernhard,

Bernhard Kraft wrote:

> Indeed, the GoF rather propose the "Template method" pattern for this
> purpose instead of the observer (signal) pattern:
> http://en.wikipedia.org/wiki/Template_method_pattern
> http://de.wikipedia.org/wiki/Schablonenmethode


This does not do what hooks do. Hooks allow various (more than one!) 
observer to alter the data that is processed further or alter it after 
processing.

This described method allows only one observer (subclass) to actually alter 
the data. It is a very good way to implement abstract algorithms to avoid 
code duplication in the implementing classes. However it does not solve to 
problem of allowing multiple observers for the same step.

Best regards
-- 
Philipp Gampe – PGP-Key 0AD96065 – TYPO3 UG Bonn/Köln
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