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https://issues.apache.org/jira/browse/WW-3718?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gorka Vicente updated WW-3718:
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Attachment: RequestDataValueProcessor.java
RequestDataValueProcessor interface
> HDIV and Struts 2 integration
> -----------------------------
>
> Key: WW-3718
> URL: https://issues.apache.org/jira/browse/WW-3718
> Project: Struts 2
> Issue Type: New Feature
> Components: Other
> Affects Versions: 2.2.3.1
> Reporter: Gorka Vicente
> Priority: Minor
> Labels: extension, integration, security, spring, tags
> Attachments: RequestDataValueProcessor.java
>
>
> Nowadays there is an intregration between Struts2 and HDIV that can be used
> by adding the HDIV filter and by using Struts2's custom tag extension. This
> means that it is possible to apply HDIV to a web application developed in
> Struts2 in a declarative way, without making any change to the source code.
> But this approach has a maintenability disadvantage that forces to release a
> new set of HDIV custom tags for every new version of Struts2. This does not
> happen to the HDIV core and web filter, as they are no intrusive extensions.
> This problem arises because there isn't a clear extension point of the
> Struts2´s custom tags that will make possible a clear extension of the
> component's behaviour without having to create a new version of it.
> Consecuently, it is necessary to create a new version of HDIV's custom tags
> for Struts2 each time a new version of the framework is released.
> Also there is the risk that the behaviour of the Struts2's custom tags may
> change in the future and become not compatible with HDIV.
> The objective of this new feature is to have an official integration between
> HDIV and Struts2 that eliminates the maintenance cost that exists today for
> new versions of Struts2. This integration will provide an integrated and
> compatible solution even for future versions of both frameworks.
> In order to get this purpose, we propose the creation of a Java interface or
> contract that will be used by Struts2's custom tags. With this extension
> point it will no longer be necessary to create specific Struts2 custom tags
> for HDIV, reducing the integration task to only implementing the interface.
> I have attached an interface proposal (RequestDataValueProcessor). Struts2
> tags should use this new interface in order to avoid tags extension.
> HDIV needs to process all urls sent to the client and needs to intercept
> redirects. Currently we extend Struts2 default ActionMapper,
> ServletRedirectResult, ServletActionRedirectResult and
> ServletActionRedirectResult. Struts2 should use the new interface in order to
> avoid these extensions.
> At this moment, we are finishing HDIV for Struts2 (2.2.3.1), extending all
> tags as in the older releases. In a few days we will publish it and it can be
> the starting point to implement a new version of Struts2 using the proposed
> new interface.
> IMPORTANT NOTES
> -----------------------------
> 1. Some time ago we spoke with Struts1 people team and they opened a
> discussion for this integration: http://wiki.apache.org/struts/HDIV
> 2. Other web frameworks like Spring MVC have been created a extension point
> like we are proposing here and a few weeks ago they have been integrated in
> the last version (3.1 RC1). You can see it here:
> https://jira.springsource.org/browse/SPR-7943
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