introduce client side windowhandler
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Key: EXTCDI-79
URL: https://issues.apache.org/jira/browse/EXTCDI-79
Project: MyFaces CODI
Issue Type: New Feature
Components: JEE-JSF20-Module
Affects Versions: 0.9.0
Reporter: Mark Struberg
A typical JSF-2 application contains much more GET links than we used to see in
JSF-1. Thus we have far more href link to cope with.
With a classical approach we would not be able to simply add a windowId
parameter to such links because if the user would open the link in a new
browser window or tab, we would carry the windowId - and thus the window scope
- over to the new browser tab/window.
There is a method to prevent this problem by storing a value directly in the
browser window via JavaScript. Usually this is done in the same page and gets
executed in the onLoadEvent like described in Marios old Orchestra summary. See
"Post render window detection" in
http://myfaces.apache.org/orchestra/myfaces-orchestra-core/multiwindow.html
The major downside of this solution is that we might already pollute 'foreign'
beans (and destroy their information) while rendering the page.
Our new approach now works around this issue by introducing a small static new
html window which gets served via a small servlet (Jsf2WindowHandlerServlet).
It gets an 'url' and after detecting a new window it will drop the windowId
parameter via JavaScript on the client and forwards to the destination page.
For creating the destination link I'll override the encodeBookmarkableURL in an
ExternalContextWrapper.
Instead of the original URL:
http://localhost:8080/course/courseDetails.xhtml?windowId=1c9f&courseNr=101348&semester=2010W
we will create a :
http://localhost:8080/course/windowhandler?url=%2Fcourse%2FcourseDetails.xhtml%3FwindowId%3D1c9f%26courseNr%3D101348%26semester%3D2010W
The windowhandler servlet serves a simple html which is cachable (TBD), thus it
doesn't lead to duplicated server roundtrips (beside the first time).
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