/*
* Copyright 2011 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.guvnor.examples.mortgage.client;
import javax.swing.JOptionPane;
import org.drools.KnowledgeBase;
import org.drools.agent.KnowledgeAgent;
import org.drools.agent.KnowledgeAgentFactory;
import org.drools.definition.type.FactType;
import org.drools.io.Resource;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;
public class MortgageClientExample {
/**
* Entry point demonstrating use of KnowledgeAgent and changesets retrieving
* a rule package from a running instance of Guvnor.
* @param args
*/
public static void main(String[] args) {
JOptionPane.showMessageDialog(null, "This example makes a few assumptions:\n" +
"- Start the app server on localhost on port 8080.\n" +
"- Rename the guvnor war to guvnor.war and deploy it to the app server.\n" +
"- Surf to Guvnor and log in.\n" +
"- In the menu Administration, Import/Export, import /exported-repositories/mortgage-sample-repository.xml\n" +
"- Refresh the browser, open menu Package, click Rebuild all packages.\n" +
"Click OK when this is done.", "Preparation", JOptionPane.INFORMATION_MESSAGE);
StatefulKnowledgeSession ksession = null;
try {
// load up the knowledge base
KnowledgeBase kbase = readKnowledgeBase();
// Dynamic fact creation as the model was declared in the DRL
FactType appType = kbase.getFactType("mortgages", "LoanApplication");
Object application = appType.newInstance();
appType.set(application, "amount", 25000);
appType.set(application, "deposit", 1500);
appType.set(application, "lengthYears", 20);
FactType incomeType = kbase.getFactType("mortgages", "IncomeSource");
Object income = incomeType.newInstance();
incomeType.set(income, "type", "Job");
incomeType.set(income, "amount", 65000);
// Invoke the magic
ksession = kbase.newStatefulKnowledgeSession();
ksession.insert(application);
ksession.insert(income);
ksession.fireAllRules();
// Voila!
String message = "The loan application is now:\n" + application;
System.out.println(message);
JOptionPane.showMessageDialog(null, message, "Result", JOptionPane.INFORMATION_MESSAGE);
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} finally {
if (ksession != null) {
ksession.dispose();
}
}
}
/**
* Load KnowledgeBase using KnowledgeAgent configured with accompanying changeset xml
* @return A KnowledgeBase
*/
private static KnowledgeBase readKnowledgeBase() {
KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("MortgageAgent");
Resource changeset = ResourceFactory.newClassPathResource(
"org/drools/guvnor/examples/mortgage/mortgage-changeset.xml");
kagent.applyChangeSet(changeset);
KnowledgeBase kbase = kagent.getKnowledgeBase();
kagent.dispose();
return kbase;
}
}