11:38 a.m.
Just doing some investigation of the drools 6 release. We dynamically build
our rules and use some thing like the following to bring them into a
stateful session:
KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder();
builder.add(ResourceFactory.newReaderResource(new StringReader(
compiledRules)), ResourceType.DRL);
KnowledgeBuilderErrors errors = builder.getErrors();
kbase.addKnowledgePackages(builder.getKnowledgePackages());
This appears to be deprecated but there is no indication in the javadoc for
what the alternative is.
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6:05 p.m.
I’ve sent a few emails on this now. See docs:
http://docs.jboss.org/drools/release/6.0.0.Final/drools-docs/html/KIEChap...
4.2.2.4. Defining a KieModule programmatically
4.2.5.9. Programaticaly build a Simple KieModule with Defaults
4.2.5.10. Programaticaly build a KieModule using Meta Models
Mark
On 2 Dec 2013, at 17:38, pmander <paul.s.mander(a)gmail.com> wrote:
Just doing some investigation of the drools 6 release. We dynamically
build
our rules and use some thing like the following to bring them into a
stateful session:
KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder();
builder.add(ResourceFactory.newReaderResource(new StringReader(
compiledRules)), ResourceType.DRL);
KnowledgeBuilderErrors errors = builder.getErrors();
kbase.addKnowledgePackages(builder.getKnowledgePackages());
This appears to be deprecated but there is no indication in the javadoc for
what the alternative is.
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2:25 a.m.
I head previously read that but didn't spot the bit that mentions creating
from a drl defined as a String. I take it this can be done from
KieFileSystem.
String rules = ...
KieFileSystem kfs = kieServices.newKieFileSystem();
kfs.write(kieServices.getResources().newReaderResource(new
StringReader(rules)));
This throws an exception complaining that the resource doesn't have a source
or target path set.
Is there a way to push a dynamically created drl into this without writing
it to disk first?
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2:50 a.m.
The KIEFileSystem is an in-memory filesystem, so what you are doing is
correct.
You will have to set at least two more properties of the resource:
1) the sourcePath - e.g. "foo/myRule.drl" will eventually place the rule
"file" in the virtual
src/main/resources/foo folder, where it will be picked up by the builder
2) the resource type, e.g. ResourceType.DRL
Unfortunately, the API-based, incremental build process in 6.0 final has
a few issues
and may not always work as expected. It is being fixed even now, but you
may have
to rebuild and update your full virtual jar every time you want to
modify the
knowledge base. See the test class IncrementalCompilationTest in the
source code
and the drools examples, and feel free to ask for more clarifications
Best
Davide
On 12/03/2013 01:25 AM, pmander wrote:
I head previously read that but didn't spot the bit that mentions
creating
from a drl defined as a String. I take it this can be done from
KieFileSystem.
String rules = ...
KieFileSystem kfs = kieServices.newKieFileSystem();
kfs.write(kieServices.getResources().newReaderResource(new
StringReader(rules)));
This throws an exception complaining that the resource doesn't have a source
or target path set.
Is there a way to push a dynamically created drl into this without writing
it to disk first?
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12:59 p.m.
There are several different ways of doing it, but here is a snippet to
help creating an in-memory kjar with default kbases and ksessions:
public static byte[] createKJar(KieServices ks,
ReleaseId releaseId,
String pom,
String... drls) {
KieFileSystem kfs = ks.newKieFileSystem();
if( pom != null ) {
kfs.write("pom.xml", pom);
} else {
kfs.generateAndWritePomXML(releaseId);
}
KieResources kr = KieServices.getResources();
for (int i = 0; i < drls.length; i++) {
if (drls[i] != null) {
kfs.write( kr.newByteArrayResource( drls[i].getBytes()
).setSourcePath("my/pkg/drl"+i+".drl") );
}
}
KieBuilder kb = ks.newKieBuilder(kfs).buildAll();
if( kb.getResults().hasMessages(
org.kie.api.builder.Message.Level.ERROR ) ) {
for( org.kie.api.builder.Message result :
kb.getResults().getMessages() ) {
System.out.println(result.getText());
}
return null;
}
InternalKieModule kieModule = (InternalKieModule) ks.getRepository()
.getKieModule(releaseId);
byte[] jar = kieModule.getBytes();
return jar;
}
Please note that you usually don't need the byte[] back, so you can
ignore everything after the last 3 lines of the code. Also, the error check
in the snippet is just printing to sysout. You should handle this
accordingly in your application.
Hope it helps.
Edson
On Tue, Dec 3, 2013 at 3:25 AM, pmander <paul.s.mander(a)gmail.com> wrote:
I head previously read that but didn't spot the bit that mentions
creating
from a drl defined as a String. I take it this can be done from
KieFileSystem.
String rules = ...
KieFileSystem kfs = kieServices.newKieFileSystem();
kfs.write(kieServices.getResources().newReaderResource(new
StringReader(rules)));
This throws an exception complaining that the resource doesn't have a
source
or target path set.
Is there a way to push a dynamically created drl into this without writing
it to disk first?
--
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http://drools.46999.n3.nabble.com/drools-6-equivalent-of-addKnowledgePack...
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Edson Tirelli
Principal Software Engineer
Red Hat Business Systems and Intelligence Group
4011
days inactive
4012
days old
4 comments
4 participants
participants (4)
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Davide Sottara -
Edson Tirelli -
Mark Proctor -
pmander