Page History

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\[1] The new style visitor no longer returns a value, instead the value can be returned using visit.stop(value)
\[2] The new visit object is introduced to control the visitor traversal
\[3] Instead of relying on magic return values the traversal is stopped by using the new visit object
\[4] Same as \[3] but a different method on IVisit is used

Component Initialization - Component#onInitialize

A new callback method was added to Component class - onInitialize(). This method is intended to provide an alternate place to initialize the component in addition to standard constructors. The advantage of using this method over a constructor is that when it is invoked the Page and the markup of the component are both available and so a more complex initialization can take place.

Before this method was introduced the developer had to rely on using onBeforeRender() method with some kind of "has-already-been-called-or-not" check to make sure the initialization code has only been run a single time. onInitialize() has this guarantee baked in - it will only be called once during the lifetime of the component.