Lachlan Paterson wrote:
Ok, I got it:
My class is a generator so it was inheriting from AbstractGenerator
which inherits from AbstractXMLProducer which implements Recyclable,
but I also was implementing CacheableProcessingComponent on my own. I
removed the CacheableProcessingComponent stub code and then it was fine.
I had started writing this generator by looking at this example:
http://cocoon.zones.apache.org/daisy/documentation/writing/sitemapcomponents/688.html
which says to implement CacheableProcessingComponent. It seems that
was wrong.
This tutorial was a better place to start:
http://cocoon.apache.org/2.1/tutorial/tutorial-generator.html
Hmm, I don't think that is right; it's entirely natural to inherit from
AbstractGenerator (or it's sub-classes, e.g. ServiceableGenerator), and
implement CacheableProcessingComponent, which itself doesn't clash with
any of the lifecycle interfaces.
It is the implementation of AbstractXMLProducer of the Recyclable
interface (a sub-interface of Poolable) which is your problem; this
means that you can't then declare implementations of any other lifecycle
interface (or sub-interface) out of SingleThreaded, ThreadSafe or Poolable.
Now you've never actually told us the signature of your Generator(!), so
I'm guessing that you had something like:
public class FooGenerator extends AbstractGenerator implements
ThreadSafe {}
or something, which would conflict with the Poolable/Recyclable
interface already declared at the AbstractXMLProducer level.
Basically, the inheritance means that you cannot have a ThreadSafe or
SingleThreaded Generator, at least not one that inherits from
AbstractXMLProducer, although you could implement one using the
individual Generator and XMLProducer interfaces.
In any case CacheableProcessingComponent is absolutely NOT incompatible
with AbstractXMLProducer, in fact it's pretty damn important as far as
Cocoon caching is concerned!
Ellis.
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