package org.drools.agent;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import junit.framework.TestCase;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.Person;
import org.drools.core.util.FileManager;
import org.drools.event.knowledgeagent.AfterChangeSetAppliedEvent;
import org.drools.event.knowledgeagent.AfterChangeSetProcessedEvent;
import org.drools.event.knowledgeagent.AfterResourceProcessedEvent;
import org.drools.event.knowledgeagent.BeforeChangeSetAppliedEvent;
import org.drools.event.knowledgeagent.BeforeChangeSetProcessedEvent;
import org.drools.event.knowledgeagent.BeforeResourceProcessedEvent;
import org.drools.event.knowledgeagent.KnowledgeAgentEventListener;
import org.drools.event.knowledgeagent.KnowledgeBaseUpdatedEvent;
import org.drools.event.knowledgeagent.ResourceCompilationFailedEvent;
import org.drools.io.ResourceChangeScannerConfiguration;
import org.drools.io.ResourceFactory;
import org.drools.io.impl.ResourceChangeNotifierImpl;
import org.drools.io.impl.ResourceChangeScannerImpl;
import org.drools.runtime.StatefulKnowledgeSession;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.handler.ResourceHandler;
public class KnowledgeAgentDSLTest extends TestCase {
FileManager fileManager;
private Server server;
private final Object lock = new Object();
private volatile boolean kbaseUpdated;
private boolean compilationErrors;
@Override
protected void setUp() throws Exception {
fileManager = new FileManager();
fileManager.setUp();
((ResourceChangeScannerImpl) ResourceFactory.getResourceChangeScannerService()).reset();
ResourceFactory.getResourceChangeNotifierService().start();
ResourceFactory.getResourceChangeScannerService().start();
this.server = new Server(0);
ResourceHandler resourceHandler = new ResourceHandler();
resourceHandler.setResourceBase(fileManager.getRootDirectory().getPath());
server.setHandler(resourceHandler);
server.start();
this.kbaseUpdated = false;
}
private int getPort() {
return this.server.getConnectors()[0].getLocalPort();
}
@Override
protected void tearDown() throws Exception {
fileManager.tearDown();
ResourceFactory.getResourceChangeNotifierService().stop();
ResourceFactory.getResourceChangeScannerService().stop();
((ResourceChangeNotifierImpl) ResourceFactory.getResourceChangeNotifierService()).reset();
((ResourceChangeScannerImpl) ResourceFactory.getResourceChangeScannerService()).reset();
server.stop();
}
public void testDSLAndIncrementalChangeSet() throws Exception {
String header = "";
header += "package org.drools.test\n";
header += "import org.drools.Person\n\n";
header += "global java.util.List list\n\n";
//create a basic dsl file
File f1 = fileManager.newFile("myExpander.dsl");
Writer output = new BufferedWriter(new FileWriter(f1));
output.write(this.createCommonDSL(null));
output.close();
//create a basic dslr file
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule1"));
output.close();
String xml = "";
xml += "<change-set xmlns='http://drools.org/drools-5.0/change-set'";
xml += " xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'";
xml += " xs:schemaLocation='http://drools.org/drools-5.0/change-set drools-change-set-5.0.xsd' >";
xml += " <add> ";
xml += " <resource source='http://localhost:" + this.getPort() + "/rules.drl' type='DSLR' />";
xml += " <resource source='http://localhost:" + this.getPort() + "/myExpander.dsl' type='DSL' />";
xml += " </add> ";
xml += "</change-set>";
File fxml = fileManager.newFile("changeset.xml");
output = new BufferedWriter(new FileWriter(fxml));
output.write(xml);
output.close();
List<String> list = new ArrayList<String>();
//Create a new Agent with newInstace=true
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
KnowledgeAgent kagent = this.createKAgent(kbase, false);
//Agent: take care of them!
kagent.applyChangeSet(ResourceFactory.newUrlResource(fxml.toURI().toURL()));
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
ksession.setGlobal("list", list);
ksession.insert(new Person());
ksession.fireAllRules();
//The rule should be fired
assertEquals(1, list.size());
assertTrue(list.contains("Rule1"));
list.clear();
kbaseUpdated = false;
Thread.sleep(2000);
//the dsl is now modified.
f1 = fileManager.newFile("myExpander.dsl");
output = new BufferedWriter(new FileWriter(f1));
output.write(this.createCommonDSL("name == \"John\""));
output.close();
//We also need to mark the dslr file as modified, so the rules could
//be regenerated
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule1"));
output.close();
this.waitUntilKBaseUpdate();
ksession.insert(new Person());
ksession.fireAllRules();
//The rule was modified then no rule got fired.
assertEquals(0, list.size());
Person p = new Person();
p.setName("John");
ksession.insert(p);
ksession.fireAllRules();
//The new fact activated and fired the modified rule
Thread.sleep(2000);
assertEquals(1, list.size());
assertTrue(list.contains("Rule1"));
//let's add a new rule
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule1"));
output.write(this.createCommonDSLRRule("Rule2"));
output.close();
this.waitUntilKBaseUpdate();
list.clear();
ksession.fireAllRules();
//because we already had a John inserted, Rule2 gets fired.
assertEquals(1, list.size());
assertTrue(list.contains("Rule2"));
//let's remove Rule1 and Rule2 and add a new rule: Rule3
Thread.sleep(2000);
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule3"));
output.close();
this.waitUntilKBaseUpdate();
//we don't want to use a new ksession.
ksession.dispose();
ksession = kbase.newStatefulKnowledgeSession();
//insert John
list.clear();
ksession.setGlobal("list", list);
ksession.insert(p);
ksession.fireAllRules();
//The only existing rule must be fired
assertEquals(1, list.size());
assertTrue(list.contains("Rule3"));
//let's delete the dsl file (errors are expected)
Thread.sleep(2000);
f1 = fileManager.newFile("myExpander.dsl");
f1.delete();
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule1"));
output.close();
this.waitUntilKBaseUpdate();
//Compilation errors should occurred
assertTrue(this.compilationErrors);
this.compilationErrors=false;
ksession.dispose();
kagent.monitorResourceChangeEvents(false);
}
public void testDSLAndNewInstance() throws Exception {
System.out.println("\n\ntestDSLAndNewInstance\n\n");
String header = "";
header += "package org.drools.test\n";
header += "import org.drools.Person\n\n";
header += "global java.util.List list\n\n";
//create a basic dsl file
File f1 = fileManager.newFile("myExpander.dsl");
Writer output = new BufferedWriter(new FileWriter(f1));
output.write(this.createCommonDSL(null));
output.close();
//create a basic dslr file
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule1"));
output.close();
String xml = "";
xml += "<change-set xmlns='http://drools.org/drools-5.0/change-set'";
xml += " xmlns:xs='http://www.w3.org/2001/XMLSchema-instance'";
xml += " xs:schemaLocation='http://drools.org/drools-5.0/change-set drools-change-set-5.0.xsd' >";
xml += " <add> ";
xml += " <resource source='http://localhost:" + this.getPort() + "/rules.drl' type='DSLR' />";
xml += " <resource source='http://localhost:" + this.getPort() + "/myExpander.dsl' type='DSL' />";
xml += " </add> ";
xml += "</change-set>";
File fxml = fileManager.newFile("changeset.xml");
output = new BufferedWriter(new FileWriter(fxml));
output.write(xml);
output.close();
List<String> list = new ArrayList<String>();
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
//Create a new Agent with newInstace=true
KnowledgeAgent kagent = this.createKAgent(kbase,true);
//Agent: take care of them!
kagent.applyChangeSet(ResourceFactory.newUrlResource(fxml.toURI().toURL()));
this.kbaseUpdated = false;
StatefulKnowledgeSession ksession = kagent.getKnowledgeBase().newStatefulKnowledgeSession();
ksession.setGlobal("list", list);
ksession.insert(new Person());
ksession.fireAllRules();
//The rule should be fired
assertEquals(1, list.size());
assertTrue(list.contains("Rule1"));
list.clear();
ksession.dispose();
Thread.sleep(2000);
//Let's modify the dsl file
f1 = fileManager.newFile("myExpander.dsl");
output = new BufferedWriter(new FileWriter(f1));
output.write(this.createCommonDSL("name == \"John\""));
output.close();
//We need to mark the dslr file as modified (even when it was not) so
//the agent could recreate the rules it contains using the new dsl.
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule1"));
output.close();
this.waitUntilKBaseUpdate();
//get a new ksession
ksession = kagent.getKnowledgeBase().newStatefulKnowledgeSession();
//A Person without name shouldn't fire any rule now (because it was
//modified)
ksession.setGlobal("list", list);
ksession.insert(new Person());
ksession.fireAllRules();
assertEquals(0, list.size());
//A "John" Person should fire the modified rule
Person p = new Person();
p.setName("John");
ksession.insert(p);
ksession.fireAllRules();
assertEquals(1, list.size());
assertTrue(list.contains("Rule1"));
ksession.dispose();
Thread.sleep(2000);
//Let's add a new Rule
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule1"));
output.write(this.createCommonDSLRRule("Rule2"));
output.close();
this.waitUntilKBaseUpdate();
//get a new ksession
ksession = kagent.getKnowledgeBase().newStatefulKnowledgeSession();
//A "John" Person now should fire 2 rules
list.clear();
ksession.setGlobal("list", list);
ksession.insert(p);
ksession.fireAllRules();
assertEquals(2, list.size());
assertTrue(list.contains("Rule1"));
assertTrue(list.contains("Rule2"));
ksession.dispose();
Thread.sleep(2000);
//Let's remove both rules and add a new one: Rule3
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule3"));
output.close();
this.waitUntilKBaseUpdate();
//get a new ksession
ksession = kagent.getKnowledgeBase().newStatefulKnowledgeSession();
//A "John" Person now should only Rule3 (the other two rules were removes)
list.clear();
ksession.setGlobal("list", list);
ksession.insert(p);
ksession.fireAllRules();
assertEquals(1, list.size());
assertTrue(list.contains("Rule3"));
ksession.dispose();
Thread.sleep(2000);
//let's delete the dsl file (errors are expected)
f1 = fileManager.newFile("myExpander.dsl");
f1.delete();
f1 = fileManager.newFile("rules.drl");
output = new BufferedWriter(new FileWriter(f1));
output.write(header);
output.write(this.createCommonDSLRRule("Rule1"));
output.close();
this.waitUntilKBaseUpdate();
//Compilation errors should occurred
assertTrue(this.compilationErrors);
this.compilationErrors=false;
kagent.monitorResourceChangeEvents(false);
}
private KnowledgeAgent createKAgent(KnowledgeBase kbase, boolean newInstance) {
ResourceChangeScannerConfiguration sconf = ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration();
sconf.setProperty("drools.resource.scanner.interval", "2");
ResourceFactory.getResourceChangeScannerService().configure(sconf);
//System.setProperty(KnowledgeAgentFactory.PROVIDER_CLASS_NAME_PROPERTY_NAME, "org.drools.agent.impl.KnowledgeAgentProviderImpl");
KnowledgeAgentConfiguration aconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
aconf.setProperty("drools.agent.scanDirectories", "true");
aconf.setProperty("drools.agent.scanResources", "true");
// Testing incremental build here
aconf.setProperty("drools.agent.newInstance", "" + newInstance);
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent(
"test agent", kbase, aconf);
final KnowledgeAgentDSLTest test = this;
kagent.addEventListener(new KnowledgeAgentEventListener() {
public void beforeChangeSetApplied(BeforeChangeSetAppliedEvent event) {
}
public void afterChangeSetApplied(AfterChangeSetAppliedEvent event) {
}
public void beforeChangeSetProcessed(BeforeChangeSetProcessedEvent event) {
}
public void afterChangeSetProcessed(AfterChangeSetProcessedEvent event) {
}
public void beforeResourceProcessed(BeforeResourceProcessedEvent event) {
}
public void afterResourceProcessed(AfterResourceProcessedEvent event) {
}
public void knowledgeBaseUpdated(KnowledgeBaseUpdatedEvent event) {
System.out.println("KBase was updated");
synchronized (lock) {
kbaseUpdated = true;
lock.notifyAll();
}
}
public void resourceCompilationFailed(ResourceCompilationFailedEvent event) {
compilationErrors = true;
}
});
assertEquals("test agent", kagent.getName());
return kagent;
}
private String createCommonDSLRRule(String ruleName) {
StringBuilder sb = new StringBuilder();
sb.append("rule ");
sb.append(ruleName);
sb.append("\n");
sb.append("when\n");
sb.append("There is a Person\n");
sb.append("then\n");
sb.append("add rule's name to list;\n");
sb.append("end\n");
return sb.toString();
}
private String createCommonDSL(String restriction) {
StringBuilder sb = new StringBuilder();
sb.append("[condition][]There is a Person = Person(");
if (restriction != null) {
sb.append(restriction);
}
sb.append(")\n");
sb.append("[consequence][]add rule's name to list = list.add( drools.getRule().getName() );\n");
return sb.toString();
}
private void waitUntilKBaseUpdate() {
synchronized (lock) {
while (!kbaseUpdated) {
try {
lock.wait();
} catch (InterruptedException e) {
}
System.out.println("Waking up!");
}
kbaseUpdated = false;
}
}
}