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http://issues.apache.org/jira/browse/FELIX-6?page=comments#action_12324525 ] 

Richard S. Hall commented on FELIX-6:
-------------------------------------

The basics are now working in my development copy, but I want to refactor the 
current solution to support multiple framework instances in memory at the same 
time, which will require a static implementation where framework instances 
register and the resource URL includes a framework instance identifier.

> Re-implement URL Handlers service
> ---------------------------------
>
>          Key: FELIX-6
>          URL: http://issues.apache.org/jira/browse/FELIX-6
>      Project: Felix
>         Type: Improvement
>     Reporter: Richard S. Hall
>     Assignee: Richard S. Hall

>
> The URL Handlers service was previously distributed as a separate bundle in 
> Oscar, but this approach is infeasible due to changes in the spec as well as 
> changes in the framework implementation itself to support 
> ClassLoader.getResources().
> In short, the R4 spec says that it must be possible to create resource URLs 
> from strings, thus this requires that the framework register a stream handler 
> factory. Further, to support access to resources inside embedded JAR files 
> inside a bundle JAR file for ClassLoader.getResources(), it is necessary to 
> encode in the returned URL which embedded JAR the resource is in, e.g.:
>     http://<bundle-id>/<embedded-jar>/<path-to-resource>
> The framework already extracts the embedded JAR files for more efficient 
> access and no other bundles can access the extracted embedded JAR files in 
> the bundle cache, so it makes sense that only the framework can implement 
> this efficiently.
> So, URL Handlers service should be implemented by the framework, however, 
> there should be a property that enables/disables the setting of the URL 
> stream handler factory, because some applications that will embed Felix may 
> not want this set since it is a singleton. If this is disabled, though, it 
> will not be spec compliant and it will not be possible to create resource 
> URLs from strings (which is how R3 worked).

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