Flash scope
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Key: WW-2635
URL: https://issues.apache.org/struts/browse/WW-2635
Project: Struts 2
Issue Type: New Feature
Components: "New" API
Affects Versions: 2.0.11
Reporter: Guillaume Bilodeau
I have developed a FlashResult / FlashInterceptor pair to implement "flash"
scope in a way that follows the usual Struts2 principles and respects its
"feel".
It basically works like the ServletActionRedirectResult except that instead of
converting all extra parameters to strings and adding them as HTTP parameters
in the redirect URL, it creates a HashMap using these parameter key/value pairs
with no conversion and stores it in the user session. On the next HTTP request
the FlashInterceptor, if properly added to the interceptor stack, will retrieve
this map and copy the map entries to the target action using the parameter
keys. It should work for all data types.
To function correctly this approach assumes that bug WW-2170 is fixed. The
implementation also borrows a lot from the ServletActionRedirectResult and some
refactoring should
be done.
While there may be issues with flash scope in general with regards to repeated
GETs being inconsistent, there are some valid use cases such as when saving
messages to be displayed after a redirect. I think it's good for the developer
to have this tool and it could make a nice addition to the Struts2 code base.
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