Reducing resource loading

> Running a sampling profiler against Orbeon running under OSGi showed a lot of
> time (~30%) spent in java.util.zip.ZipEntry, it seemed a lot of time is
> spent re-retrieving resources from inside jars (perhaps this is more
> expensive when they are inside OSGi bundles, I'm not sure).
>
> This tracked back to a couple of places in Orbeon:
>
> 1. Although the org.orbeon.oxf.resources.ResourceManagerBase class has some
> optimisation for caching lastModified values, there is no such handling for
> exists(). Every exists() call retrieves the resource input stream. My local
> workaround was to implement a custom resource handler which cached the
> results of the exists() call.
>
> 2. Creating Castor mapping objects seems to instantiate a new parser which
> also seems to load some resource. This was showing up for us in a call from
> the ScopeGenerator#fillOutState, because our input config didn't have any
> mappings, and the mapping is constructed anew every time:
>
>        if (getConnectedInputs().get(INPUT_MAPPING) == null) {
>                mapping = new Mapping();
>                mapping.loadMapping(new InputSource(new StringReader("<mapping/>")));
>
> Simply adding this input to the scope generator call:
>
>  <p:input name="mapping"><mapping/></p:input>
>
> avoided the problem because in this the parsed mapping is wrapped in a
> CacheableInputReader.
>
> These two simple changes reduced the elapsed time in Orbeon significantly
> (about 350ms to 250ms), though I could be running in an environment where
> java.util.zip.ZipEntry is particularly expensive.
>
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