2 * Copyright 2017 ZTE Corporation.
\r
4 * Licensed under the Apache License, Version 2.0 (the "License");
\r
5 * you may not use this file except in compliance with the License.
\r
6 * You may obtain a copy of the License at
\r
8 * http://www.apache.org/licenses/LICENSE-2.0
\r
10 * Unless required by applicable law or agreed to in writing, software
\r
11 * distributed under the License is distributed on an "AS IS" BASIS,
\r
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
\r
13 * See the License for the specific language governing permissions and
\r
14 * limitations under the License.
\r
16 package org.onap.holmes.engine.manager;
\r
19 import java.io.StringReader;
\r
20 import java.util.HashSet;
\r
21 import java.util.List;
\r
22 import java.util.Locale;
\r
23 import java.util.Set;
\r
24 import javax.annotation.PostConstruct;
\r
25 import javax.inject.Inject;
\r
26 import lombok.extern.slf4j.Slf4j;
\r
27 import org.drools.KnowledgeBase;
\r
28 import org.drools.KnowledgeBaseConfiguration;
\r
29 import org.drools.KnowledgeBaseFactory;
\r
30 import org.drools.builder.KnowledgeBuilder;
\r
31 import org.drools.builder.KnowledgeBuilderFactory;
\r
32 import org.drools.builder.ResourceType;
\r
33 import org.drools.conf.EventProcessingOption;
\r
34 import org.drools.definition.KnowledgePackage;
\r
35 import org.drools.io.Resource;
\r
36 import org.drools.io.ResourceFactory;
\r
37 import org.drools.runtime.StatefulKnowledgeSession;
\r
38 import org.drools.runtime.rule.FactHandle;
\r
39 import org.jvnet.hk2.annotations.Service;
\r
40 import org.onap.holmes.common.api.stat.VesAlarm;
\r
41 import org.onap.holmes.engine.request.DeployRuleRequest;
\r
42 import org.onap.holmes.common.api.entity.CorrelationRule;
\r
43 import org.onap.holmes.common.exception.CorrelationException;
\r
44 import org.onap.holmes.common.utils.ExceptionUtil;
\r
45 import org.onap.holmes.engine.wrapper.RuleMgtWrapper;
\r
49 public class DroolsEngine {
\r
51 private final static int ENABLE = 1;
\r
52 private final Set<String> packageNames = new HashSet<String>();
\r
54 private RuleMgtWrapper ruleMgtWrapper;
\r
55 private KnowledgeBase kbase;
\r
56 private KnowledgeBaseConfiguration kconf;
\r
57 private StatefulKnowledgeSession ksession;
\r
60 private void init() {
\r
64 } catch (Exception e) {
\r
65 log.error("Failed to start the service: " + e.getMessage(), e);
\r
66 throw ExceptionUtil.buildExceptionResponse("Failed to start the drools engine!");
\r
70 private void start() throws CorrelationException {
\r
71 log.info("Drools Engine Initialize Beginning...");
\r
73 initEngineParameter();
\r
76 log.info("Business Rule Engine Initialize Successfully.");
\r
79 public void stop() {
\r
80 this.ksession.dispose();
\r
83 private void initEngineParameter() {
\r
84 this.kconf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
\r
86 this.kconf.setOption(EventProcessingOption.STREAM);
\r
88 this.kconf.setProperty("drools.assertBehaviour", "equality");
\r
90 this.kbase = KnowledgeBaseFactory.newKnowledgeBase("D-ENGINE", this.kconf);
\r
92 this.ksession = kbase.newStatefulKnowledgeSession();
\r
95 private void initDeployRule() throws CorrelationException {
\r
96 List<CorrelationRule> rules = ruleMgtWrapper.queryRuleByEnable(ENABLE);
\r
98 if (rules.isEmpty()) {
\r
101 for (CorrelationRule rule : rules) {
\r
102 if (rule.getContent() != null) {
\r
103 deployRuleFromDB(rule.getContent());
\r
108 private void deployRuleFromDB(String ruleContent) throws CorrelationException {
\r
109 StringReader reader = new StringReader(ruleContent);
\r
110 Resource res = ResourceFactory.newReaderResource(reader);
\r
112 KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
\r
114 kbuilder.add(res, ResourceType.DRL);
\r
118 kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
\r
119 } catch (Exception e) {
\r
120 throw new CorrelationException(e.getMessage(), e);
\r
122 ksession.fireAllRules();
\r
125 public synchronized String deployRule(DeployRuleRequest rule, Locale locale)
\r
126 throws CorrelationException {
\r
127 StringReader reader = new StringReader(rule.getContent());
\r
128 Resource res = ResourceFactory.newReaderResource(reader);
\r
130 KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
\r
132 kbuilder.add(res, ResourceType.DRL);
\r
134 judgeRuleContent(locale, kbuilder, true);
\r
136 String packageName = kbuilder.getKnowledgePackages().iterator().next().getName();
\r
138 packageNames.add(packageName);
\r
139 kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
\r
140 } catch (Exception e) {
\r
141 throw new CorrelationException("Failed to deploy the rule.", e);
\r
144 ksession.fireAllRules();
\r
145 return packageName;
\r
148 public synchronized void undeployRule(String packageName, Locale locale)
\r
149 throws CorrelationException {
\r
151 KnowledgePackage pkg = kbase.getKnowledgePackage(packageName);
\r
154 throw new CorrelationException("The rule " + packageName + " does not exist!");
\r
158 kbase.removeKnowledgePackage(pkg.getName());
\r
159 } catch (Exception e) {
\r
160 throw new CorrelationException("Failed to delete the rule: " + packageName, e);
\r
162 packageNames.remove(pkg.getName());
\r
165 public void compileRule(String content, Locale locale)
\r
166 throws CorrelationException {
\r
167 StringReader reader = new StringReader(content);
\r
168 Resource res = ResourceFactory.newReaderResource(reader);
\r
170 KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
\r
172 kbuilder.add(res, ResourceType.DRL);
\r
174 judgeRuleContent(locale, kbuilder, false);
\r
177 private void judgeRuleContent(Locale locale, KnowledgeBuilder kbuilder, boolean judgePackageName)
\r
178 throws CorrelationException {
\r
179 if (kbuilder.hasErrors()) {
\r
180 String errorMsg = "There are errors in the rule: " + kbuilder.getErrors().toString();
\r
181 log.error(errorMsg);
\r
182 throw new CorrelationException(errorMsg);
\r
185 String packageName = kbuilder.getKnowledgePackages().iterator().next().getName();
\r
187 if (packageNames.contains(packageName) && judgePackageName) {
\r
188 throw new CorrelationException("The rule " + packageName + " already exists in the drools engine.");
\r
192 public void putRaisedIntoStream(VesAlarm raiseAlarm) {
\r
193 FactHandle factHandle = this.ksession.getFactHandle(raiseAlarm);
\r
194 if (factHandle != null) {
\r
195 this.ksession.retract(factHandle);
\r
197 this.ksession.insert(raiseAlarm);
\r
198 this.ksession.fireAllRules();
\r