Provide a conversation scope (syn: Flash scope, dialog scope) object to store
data between requests.
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Key: STR-2939
URL: http://issues.apache.org/struts/browse/STR-2939
Project: Struts 1
Issue Type: Improvement
Components: Core
Reporter: Michael Jouravlev
Assigned To: Michael Jouravlev
Priority: Minor
In addition to standard J2EE scopes (page for JSP, request, session and
application) provide a new scope object that would hold data between requests.
Similar facilities in Tapestry and Stripes are called FlashScope, Struts 1 will
call it as Conversation Scope.
Physically, this object will be stored in the session object. It will allow the
same get/set/remove operations as other scopes. The objects placed in this
scope will be removed two roundtrips after they were placed (they are intended
to be used after the first roundtrip). The object lifetime can be increased by
increasing a corresponding roundtrip counter.
Struts 1.2.x introduced storing messages in the session with their automatic
cleanup after they are used, usually in a JSP page. Therefore, Struts 1.2.x has
a rudimentary Conversation Scope for messages only. Retrofit mesage handling,
queue messages to Conversation scope.
* Provide direct access to Conversation scope from Action (create a method)
* Update saveMessages to accept Conversation scope
* For classes other than Action provide an utility method in RequestUtils
* Allow using Conversation scope in an action mapping definition for
ActionForms.
>From developer's point of view usage of ActionForms in Conversation scope +
>redirect to view should be similar to usage of ActionForms in request scope
>and forwarding to view. Ideally it should be possible to retrofit statelless
>actions that forward to JSPs to Conversation actions that redirect to views by
>only changing the scope of an ActionForm in an action mapping.
What the whole thing is for? To be able to use redirection without worrying
about garbage in the session. Redirection allows to provide better user
experience, in particular related to navigation and double submit.
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