add java annotation support for sling scr components/servlets
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Key: SLING-902
URL: https://issues.apache.org/jira/browse/SLING-902
Project: Sling
Issue Type: New Feature
Components: Servlets Resolver
Reporter: Stefan Seifert
Attachments: 090329_sling_scr_annotations.zip
please note: this proposal depends on a felix-scr-plugin proposal described in
https://issues.apache.org/jira/browse/FELIX-1010
with the described scr plugin enhancement it is possible to define SCR
component definitions via annotations. furthermore it is possible for felix/SCR
based projects to define their own and less verbose annotations for specific
need, together with a provider class mapping them to the SCR tags needed by the
plugin internally.
the attached zip file provides such a implemented for one new annotation
"SlingServlet", see example below.
i was not sure into which project and classpath this classes should be placed,
so i attached a ZIP file for discussion and try-out. the best solution would be
to split them up into two projects - one project containing only the
annotation, and the other containing the provider and tag mapping. the first
project has no dependencies and can be referenced by any other project needing
the annotation. the second has to import the felix-scr-plugin as dependency,
this results in a lot of transitive dependency not to be wished in a normal
project.
Example
-------
QDox version:
/**
* Sample servlet with sling mappings.
*
* @scr.component immediate="true"
* @scr.service interface="javax.servlet.Servlet"
* @scr.property name="sling.servlet.methods" value="GET"
* @scr.property name="sling.servlet.resourceTypes"
* value="/apps/test/components/samplecomponent"
* @scr.property name="sling.servlet.extensions" values.0="html" values.1="json"
*/
public class SlingServletQDox implements Servlet {
Annotation version:
/**
* Sample servlet with sling mappings.
*/
@SlingServlet(methods = "GET", resourceTypes =
"/apps/test/components/samplecomponent", extensions = { "html", "json" })
public class SlingServletAnnotation implements Servlet {
Custom annotation mappings can be integrated by defining a class implementing
"org.apache.felix.scrplugin.tags.annotation.AnnotationTagProvider" for the new
plugin property "annotationTagProviders" in the pom.
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