Add ResourceService for serving static resources
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Key: CLK-564
URL: https://issues.apache.org/jira/browse/CLK-564
Project: Click
Issue Type: New Feature
Components: core
Affects Versions: 2.1.0
Reporter: Malcolm Edgar
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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