Cheers

On Wed, May 9, 2012 at 12:55 PM, soumya_sd <soumya_sd@yahoo.com> wrote:

I've a use case where I need to create a rule dynamically every time the user
sends a request.
My current understanding of Drools is that you need to create a
KnowledgeBuilder and then add the rules

I'm creating the KnowledgeBase as follows.

private static KnowledgeBase readKnowledgeBase() throws Exception {
long t1 = System.currentTimeMillis();
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
long t11 = System.currentTimeMillis();

kbuilder.add(
org.drools.io.ResourceFactory.newByteArrayResource(getRule()),
ResourceType.DRL);

long t2 = System.currentTimeMillis();

KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error: errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse
knowledge.");
}
long t3 = System.currentTimeMillis();

KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
long t4 = System.currentTimeMillis();

kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
long t5 = System.currentTimeMillis();

Collection<KnowledgePackage> kpackages =
kbase.getKnowledgePackages();
for (KnowledgePackage knowledgePackage : kpackages) {
System.out.println("Package -------- " + knowledgePackage.getName());
Collection<Rule> rules = knowledgePackage.getRules();
for (Rule rule : rules) {
System.out.println("****" + rule.getName());
}
}
long t6 = System.currentTimeMillis();

System.out.println( (t11-t1) + " " + (t2-t11) + " " + ( t3-t2) + " " +
( t4-t3) + " " + ( t5-t4) + " " + ( t6-t5)+ " " );

return kbase;
}

Based on the timing logs the code take majority (more than 80%) of time in
only these two operations. Is there a way to make it faster ?

KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( org.drools.io.ResourceFactory.newByteArrayResource(getRule()),
ResourceType.DRL);

thanks.

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