/**
* This file is part of Graylog2.
*
* Graylog2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Graylog2 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Graylog2. If not, see <http://www.gnu.org/licenses/>.
*/
package org.graylog2.rules;
import org.graylog2.plugin.Message;
import org.graylog2.plugin.RulesEngine;
import org.kie.api.runtime.KieSession;
import org.kie.api.runtime.rule.FactHandle;
import java.io.IOException;
public class DroolsRulesSession implements RulesEngine.RulesSession {
private KieSession kieSession;
public DroolsRulesSession(KieSession kieSession) {
this.kieSession = kieSession;
}
@Override
public void close() throws IOException {
kieSession.dispose();
kieSession = null;
}
@Override
public int evaluate(Message message, boolean retractFacts) {
if (kieSession == null) {
throw new IllegalStateException("Session already disposed");
}
final FactHandle handle = kieSession.insert(message);
final int rulesFired = kieSession.fireAllRules();
if (retractFacts) {
kieSession.delete(handle);
}
return rulesFired;
}
@Override
public Object insertFact(Object fact) {
return kieSession.insert(fact);
}
@Override
public boolean deleteFact(Object fact) {
final FactHandle factHandle = kieSession.getFactHandle(fact);
if (factHandle == null) {
return false;
}
kieSession.delete(factHandle);
return true;
}
}