public KnowledgeBase getKnowledgeBase() {
if (this.kbase != null) {
return kbase;
}
knownPackages = new CopyOnWriteArraySet<String>();
Properties consoleProperties = PropertyLoader.getJbpmConsoleProperties();
GuvnorConnectionUtils guvnorUtils = new GuvnorConnectionUtils();
if (guvnorUtils.guvnorExists()) {
kagent = buildKnowledgeAgent(guvnorUtils);
if (kagent != null) {
kbase = kagent.getKnowledgeBase();
}
} else {
logger.warn("Could not connect to Guvnor.");
}
// Create a kbase if we couldn't do that with Guvnor
if (kbase == null) {
kbase = KnowledgeBaseFactory.newKnowledgeBase();
}
// load processes from local file system
addProcessesFromConsoleDirectory(kbase, consoleProperties);
// add known packages
for (KnowledgePackage pkg : kbase.getKnowledgePackages()) {
knownPackages.add(pkg.getName());
}
return kbase;
}
protected KnowledgeAgent buildKnowledgeAgent(GuvnorConnectionUtils guvnorUtils) {
try {
ResourceChangeScannerConfiguration sconf =
ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration();
sconf.setProperty("drools.resource.scanner.interval", "10");
ResourceFactory.getResourceChangeScannerService().configure(sconf);
ResourceFactory.getResourceChangeScannerService().start();
ResourceFactory.getResourceChangeNotifierService().start();
KnowledgeAgentConfiguration aconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
aconf.setProperty("drools.agent.newInstance", "false");
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("Guvnor default", aconf);
kagent.applyChangeSet(ResourceFactory.newReaderResource(guvnorUtils.createChangeSet()));
return kagent;
} catch (Throwable t) {
logger.error("Could not load processes from Guvnor: " + t.getMessage(), t);
return null;
}
}
public synchronized void syncPackages() {
try {
GuvnorConnectionUtils guvnorUtils = new GuvnorConnectionUtils();
if (guvnorUtils.guvnorExists()) {
if (kagent == null) {
kagent = buildKnowledgeAgent(guvnorUtils);
}
List<String> guvnorPackages = guvnorUtils.getBuiltPackageNames();
guvnorPackages.removeAll(knownPackages);
if (guvnorPackages.size() > 0 && kagent != null) {
kagent.applyChangeSet(
ResourceFactory.newReaderResource(guvnorUtils.createChangeSet(guvnorPackages)));
knownPackages.addAll(guvnorPackages);
}
}
} catch (Exception e) {
logger.error("Error while checking packages from Guvnor", e);
}
}
