Re: [rules-users] Failing serialisation of large rule base
Hi Michal,
With regard to point 2, the StackOverflowException was thrown based on
standard Java stack size and not from within the DroolsObject stream as I
thought. Increasing the stack size allowed me to serialise the full
KnowledgeBase with noticable speed results.
I am keen to do things 'properly' though so on to point 3....
The method 'createSerializableMarshaller' in MarshallingTest.java takes a
KnowledgeBase as parameter. So I create a Marshaller and .marshall the
StatefulKnowledgeSession. No problems.
Then to unmarshall I create a new Marshaller? but I no longer have the same
knowledgeBase and a null pointer exception is thrown when I use
marshaller.unmarshall.
java.lang.NullPointerException
at
org.drools.common.ConcurrentNodeMemories.getNodeMemory(ConcurrentNodeMemories.java:69)
at
org.drools.common.AbstractWorkingMemory.getNodeMemory(AbstractWorkingMemory.java:1534)
at
org.drools.marshalling.impl.InputMarshaller.readFactHandles(InputMarshaller.java:334)
at
org.drools.marshalling.impl.InputMarshaller.readSession(InputMarshaller.java:207)
at
org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:75)
at
org.drools.marshalling.impl.DefaultMarshaller.unmarshall(DefaultMarshaller.java:47)
Or am I misunderstanding... should I be able to serialise the Marshaller
created in createSerializableMarshaller? This would make sense by the name!!
How do I serialise it? DroolsObjectOutputStream?
Regards,
Jen
Michal Bali-2 wrote:
Hi Jen,
To answer your 3. point. You can create a serializable marshaller like
this:
MarshallerFactory.newSerializeMarshallingStrategy( acceptor );
You can find complete examples here:
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-compiler...
Best regards,
Michal
On Sat, Jul 11, 2009 at 11:55 PM, LadyCode <j_whittlesea(a)hotmail.com>
wrote:
>
> Hi,
>
> I have written a Java application that reads in approximately 6000 .dslr
> rules at runtime. This takes around 6minutes, however I have installed
> the
> application on the target (rather old!) machine and load time is in
> excess
> of 20minutes. I have been trying without success to find a way to speed
> up
> loading:
>
> I have tried:
>
> 1. Serialising the KnowledgePackages themselves. This works well but has
> limited effect on load time.
> 2. Serialising the KnowledgeBase, this does not seem to work on large
> rule
> bases and fails with StackOverflowException when I load more than about
> 200
> rules.
> 3. Serialising the StatefulKnowledgeSession using
>
> Marshaller marshaller = MarshallerFactory.newMarshaller(knowledgeBase);
> marshaller.marshall(out, session);
>
> This works well for the life of the marshaller but does not solve my
> problem
> as I need to restart the application and therefore cannot use the same
> instance of marshaller later on. Marshaller is not serialisable.
>
> I know some of these points are discussed in other posts. But is there
> anything I can do or have I missed the point?
>
> Any help or comments very much appreciated,
>
> Regards,
> Jen
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