Issue #16: Is handleEvents allowed to redirect user?

[Subbu Allamaraju <subbu@bea.com>]

I was tasked with starting a discussion on whether there is a need to 
allow handleEvents to redirect the user. Here it goes.

Regards

Subbu
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Use case
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Portlet A fires a bigDeal event. Portlet B receives the event, and would 
like to redirect the user to Big Deal portal.

Current Model
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Portlet B cannot redirect the user during handleEvents(), and will have 
to somehow cause an interaction after handling the event to cause the 
redirect.

Proposed Model
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Add a new redirectURL to the response of handleEvents. After processing 
all events, Consumer SHOULD redirect the user to the redirectURL. Since 
we allow for state changes during handleEvents, adding this field will 
align handleEvents more closely with performBlockingInteraction.

Side effect
-----------

Portlet C is also handling the bigDeal event, and wants the Consumer to 
redirect the user to Big Promo portal. In this case, the end result may 
not be consistent across portal implementations. I guess the same can 
happen with newWindowMode or newWindowState. For example, both the event 
handling portlets may ask to be maximized. We need to be explicit about 
this possibility in the spec.