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From "Bob Schellink (JIRA)" <>
Subject [jira] Commented: (CLK-564) Add ResourceService for serving static resources
Date Fri, 06 Nov 2009 12:09:32 GMT


Bob Schellink commented on CLK-564:

Hi Malcolm,

I've checked in a change to the ClickResourceService to serve resources lazily. This has some
advantages over eager loading:

- resources won't be loaded if they are not requested. This resolves the issue with eager
loading where all resources from jars are loaded, even if some of those resources aren't valid
static resources, for example Velocity templates with extensions other than .htm.

- removed all duplicate code shared with XmlConfigService

- with lazy loading it was easy to add the ability to only cache resources in production modes

The only feature still outstanding is how to handle the case where Velocity attempts to render
a template contained under META-INF/resources. Currently the VelocityTemplateService caters
for two built in templates, but won't handle custom templates. I suppose we can cross that
bridge when we get there.

> Add ResourceService for serving static resources
> ------------------------------------------------
>                 Key: CLK-564
>                 URL:
>             Project: Click
>          Issue Type: New Feature
>          Components: core
>    Affects Versions: 2.1.0 RC1
>            Reporter: Malcolm Edgar
>            Assignee: Malcolm Edgar
>             Fix For: 2.1.0
>         Attachments: report_1.html, report_2.html, report_3.html
> The Click static resource deployment strategy of writing *.htm, *.css and image files
to the web application /click/ directory does not work on all application servers. In particular
WebLogic and WebSphere have security restrictions which prevent this from occuring. In these
scenarios users are have to deploy these applications to the WAR file at build time.  Google
GAE also does not support this deployment mode.
> A solution to this problem is to use the ClickServlet to serve these resources. By adding
an additional web.xml mapping:
> 	<servlet-mapping>
> 		<servlet-name>ClickServlet</servlet-name>
> 		<url-pattern>/click/*</url-pattern>
> 	</servlet-mapping>
> The ClickServlet could use a ResourceService interface obtained from the ConfigService
which returns the resource data. A default ClickResourceService would be provided which loads
all the resources at application initialization time. This service would scan all the JAR
files for resources in META-INF/web as is currently done in XmlConfigService and would cache
them in memory. The service would also scan all the resources under the WAR /click/ directory.
These resources would override any defined in the application JAR files.
> This could be a good feature for 2.1.0, we should possibly delay the 2.1.0 RC release
to include this feature.

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