[rules-users] Failing serialisation of large rule base

[LadyCode]

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/src/test/java/org/drools/integrationtests/MarshallingTest.java
> 
> Best regards,
> Michal
> 
> 
> On Sat, Jul 11, 2009 at 11:55 PM, LadyCode <j_whittlesea at 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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>>
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> 
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