[jira] Updated: (STR-2940) Base Action should implement dispatch functionality (building a coarse-grained action)

["Paul Benedict (JIRA)" <ji...@apache.org>]

     [ http://issues.apache.org/struts/browse/STR-2940?page=all ]

Paul Benedict updated STR-2940:
-------------------------------

    Component/s: Core

> Base Action should implement dispatch functionality (building a coarse-grained action)
> --------------------------------------------------------------------------------------
>
>                 Key: STR-2940
>                 URL: http://issues.apache.org/struts/browse/STR-2940
>             Project: Struts 1
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Michael Jouravlev
>         Assigned To: Michael Jouravlev
>            Priority: Minor
>
> Since DispatchAction was introduced, it became possible to write actions in two styles:
> * Fine-grained actions that process only one kind of request / command / event. These are standard Action classes where code is written in execute() method.
> * Coarse-grained actions that process several commands/events. These are DispatchAction, MappingDispatchAction, LookupDispatchAction and EventDispatchAction. 
> Building coarse-grained actions always has been kind of hack with either using the generic "parameter" attribute of an action mapping, or with building event-to-method maps in the code.
> The proposed enhancement has the following goals:
> * Add dispatch functionality to base Action without affecting current Action usage.
> * Accept that both fine-grained and coarse-grained approaches are valid and should be equally represented; one approach should not suffer from dominating of another.
> * Extend syntax of an action mapping to allow event defintion using designated elements instead of using hacks like generic "parameter" attribute.
> * Allow using wildcards in event definitions.
> * With a coarse-grained action it is easier to introduce a concept of a web resource that can be affected by several events, can have state and can render several views. This concept allows to draw some similarities between a Model 2 framework like Struts and code-behind framework like .NET: Action + ActionForm is a code-behind, JSP is markup, event-handling methods in an Action class are event handlers.
> Introduction of Command class in Struts 1.3.x does not affect coarse-grained actions, these actions should be implemented with an Action class.
> Action class retrofitted to support dispatch functionality will behave exactly like EventDispatchAction when used as a coarce-grained action.

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