Need clear example on how to compile to KieContainer or KieBase and deserialize to external file

[arnie....@gmail.com]

I'm involved in a project that uses Drools 4. It reads in each .drl or .xls file separately, got a RuleBase instance and deserialized it to a .ser file. These files were individually deserialized at runtime as needed.

Now, with 6.3.0, I cannot figure out the various Kie* classes and technique to use to do the same thing. Based on lots of still fruitless googling, I find that I am not alone. I think I am close though:

COMPILER LOGIC

KieBase result = null;
KieServices kieServices = KieServices.Factory.get();
KieFileSystem kfs = kieServices.newKieFileSystem();

Resource resource = kieServices.getResources().newInputStreamResource(getFileAsStream(ruleName));
resource.setResourceType(ResourceType.DRL);
kfs.write(file.getName(), resource);
KieBuilder kieBuilder = kieServices.newKieBuilder(kfs);
kieBuilder.buildAll();
if (kieBuilder.getResults().hasMessages(org.kie.api.builder.Message.Level.ERROR)) {
    throw new RuntimeException("Build time Errors: " + kieBuilder.getResults().toString());
}
KieContainer kieContainer = kieServices.newKieContainer(kieServices.getRepository().getDefaultReleaseId());
// get the KIE related configuration container and set the EventProcessing (from default cloud) to Stream
KieBaseConfiguration config = kieServices.newKieBaseConfiguration();
config.setOption(EventProcessingOption.STREAM);
result = kieContainer.newKieBase(config);

SERIALIZATION LOGIC

FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream out = new ObjectOutputStream(fos);

// export the KieBase
out.writeObject(kieBase);

out.flush();
out.close();

THE PROBLEM is that every .ser file generated is 23kb and some of those .drl or .xls files are large. I find it difficult to believe this is working.

I suspect that the problem is that the KieContainer that is created for stream mode is empty, even though the builder worked just fine.

Perhaps I have a step out of order, but I cannot see how.

Can someone PLEASE clarify this?

[arnie....@gmail.com]

Added a reporting method, that always shows no packages or processes.

So clearly, the parsed .drl or .xls file data isn't making it from the KFS->builder to the container->base.

private static void explainKieBase(KieBase kieBase) {
        if ( kieBase == null ) return;
        Collection<Process> processes = kieBase.getProcesses();
        if ( processes == null || processes.isEmpty() ) {
            LOGGER.error("kieBase contained NO processes.");
        } else {
            LOGGER.info(MessageFormat.format("Found {0,number} processes:", processes.size()));
            for ( Process process : processes ) {
                LOGGER.info(MessageFormat.format("{0}:{1} - {2} - {3}",
                    process.getPackageName(), process.getName(), process.getType(), process.getVersion()));
            }
        }
       
        Collection<KiePackage> packages = kieBase.getKiePackages();
        if ( packages == null || packages.isEmpty() ) {
            LOGGER.error("kieBase contained NO packages.");
        } else {
            LOGGER.info(MessageFormat.format("Found {0,number} packages:", packages.size()));
            for ( KiePackage p : packages ) {
                LOGGER.info(MessageFormat.format("{0}", p.getName()));
                Collection<Rule> rules = p.getRules();
                if ( rules == null || rules.isEmpty() ) {
                    LOGGER.error("kieBase:package contained NO rules.");
                } else {
                    if ( rules == null || rules.isEmpty() ) {
                        for ( Rule rule : rules ) {
                            LOGGER.info(MessageFormat.format("{0}:{1}",
                                rule.getPackageName(), rule.getName()));
                        }
                    }
                }
            }
        }
    }

[Michael Anstis]

There's a smorgasbord of examples in drools/drools-examples. I assume you've pawed through those?

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