Can Readers cache?

[Hunsberger, Peter]

I've got a situation where I'd like to cache the output of a reader
(it's producing CSS).  I have a reader that extends one of our classes
defined as follows:

        public abstract class AbstractCtReader extends AbstractReader
implements CacheableProcessingComponent {

This class includes:

    public abstract java.io.Serializable getKey();

    public abstract SourceValidity getValidity();

The reader in question then has:

        public class StyleSheetReader extends AbstractCtReader {

And:

    public java.io.Serializable getKey() {
        keyValue = "styleData_" + this.getServiceId() + 
                    "-" + this.outData.getTemplateData().getScreenId();
        return keyValue;
    }

    public SourceValidity getValidity() {
        if (keyValue != null) {
            return new CtSourceValidity(keyValue);
        }
        return null;
    }

Debugging reveals that the getKey and getValidity methods are not ever
called????

This is on Cocoon 2.1.4

Peter Hunsberger