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/**
* Copyright 2017 ZTE Corporation.
*
* 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.onap.holmes.engine.manager;
import java.io.StringReader;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Set;
import javax.annotation.PostConstruct;
import javax.inject.Inject;
import lombok.extern.slf4j.Slf4j;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseConfiguration;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.conf.EventProcessingOption;
import org.drools.definition.KnowledgePackage;
import org.drools.io.Resource;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;
import org.drools.runtime.rule.FactHandle;
import org.jvnet.hk2.annotations.Service;
import org.onap.holmes.common.api.stat.VesAlarm;
import org.onap.holmes.engine.request.DeployRuleRequest;
import org.onap.holmes.common.api.entity.CorrelationRule;
import org.onap.holmes.common.exception.CorrelationException;
import org.onap.holmes.common.utils.ExceptionUtil;
import org.onap.holmes.engine.wrapper.RuleMgtWrapper;
@Slf4j
@Service
public class DroolsEngine {
private final static int ENABLE = 1;
private final Set<String> packageNames = new HashSet<String>();
@Inject
private RuleMgtWrapper ruleMgtWrapper;
private KnowledgeBase kbase;
private KnowledgeBaseConfiguration kconf;
private StatefulKnowledgeSession ksession;
@PostConstruct
private void init() {
try {
// start engine
start();
} catch (Exception e) {
log.error("Failed to start the service: " + e.getMessage(), e);
throw ExceptionUtil.buildExceptionResponse("Failed to start the drools engine!");
}
}
private void start() throws CorrelationException {
log.info("Drools Engine Initialize Beginning...");
initEngineParameter();
initDeployRule();
log.info("Business Rule Engine Initialize Successfully.");
}
public void stop() {
this.ksession.dispose();
}
private void initEngineParameter() {
this.kconf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
this.kconf.setOption(EventProcessingOption.STREAM);
this.kconf.setProperty("drools.assertBehaviour", "equality");
this.kbase = KnowledgeBaseFactory.newKnowledgeBase("D-ENGINE", this.kconf);
this.ksession = kbase.newStatefulKnowledgeSession();
}
private void initDeployRule() throws CorrelationException {
List<CorrelationRule> rules = ruleMgtWrapper.queryRuleByEnable(ENABLE);
if (rules.isEmpty()) {
return;
}
for (CorrelationRule rule : rules) {
if (rule.getContent() != null) {
deployRuleFromDB(rule.getContent());
}
}
}
private void deployRuleFromDB(String ruleContent) throws CorrelationException {
StringReader reader = new StringReader(ruleContent);
Resource res = ResourceFactory.newReaderResource(reader);
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(res, ResourceType.DRL);
try {
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
} catch (Exception e) {
throw new CorrelationException(e.getMessage(), e);
}
ksession.fireAllRules();
}
public synchronized String deployRule(DeployRuleRequest rule, Locale locale)
throws CorrelationException {
StringReader reader = new StringReader(rule.getContent());
Resource res = ResourceFactory.newReaderResource(reader);
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(res, ResourceType.DRL);
judgeRuleContent(locale, kbuilder, true);
String packageName = kbuilder.getKnowledgePackages().iterator().next().getName();
try {
packageNames.add(packageName);
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
} catch (Exception e) {
throw new CorrelationException("Failed to deploy the rule.", e);
}
ksession.fireAllRules();
return packageName;
}
public synchronized void undeployRule(String packageName, Locale locale)
throws CorrelationException {
KnowledgePackage pkg = kbase.getKnowledgePackage(packageName);
if (null == pkg) {
throw new CorrelationException("The rule " + packageName + " does not exist!");
}
try {
kbase.removeKnowledgePackage(pkg.getName());
} catch (Exception e) {
throw new CorrelationException("Failed to delete the rule: " + packageName, e);
}
packageNames.remove(pkg.getName());
}
public void compileRule(String content, Locale locale)
throws CorrelationException {
StringReader reader = new StringReader(content);
Resource res = ResourceFactory.newReaderResource(reader);
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(res, ResourceType.DRL);
judgeRuleContent(locale, kbuilder, false);
}
private void judgeRuleContent(Locale locale, KnowledgeBuilder kbuilder, boolean judgePackageName)
throws CorrelationException {
if (kbuilder.hasErrors()) {
String errorMsg = "There are errors in the rule: " + kbuilder.getErrors().toString();
log.error(errorMsg);
throw new CorrelationException(errorMsg);
}
String packageName = kbuilder.getKnowledgePackages().iterator().next().getName();
if (packageNames.contains(packageName) && judgePackageName) {
throw new CorrelationException("The rule " + packageName + " already exists in the drools engine.");
}
}
public void putRaisedIntoStream(VesAlarm raiseAlarm) {
FactHandle factHandle = this.ksession.getFactHandle(raiseAlarm);
if (factHandle != null) {
Object obj = this.ksession.getObject(factHandle);
if (obj != null && obj instanceof VesAlarm) {
raiseAlarm.setRootFlag(((VesAlarm) obj).getRootFlag());
}
this.ksession.retract(factHandle);
}
this.ksession.insert(raiseAlarm);
this.ksession.fireAllRules();
}
}
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