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/*
* ============LICENSE_START==========================================
* ONAP Portal SDK
* ===================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ===================================================================
*
* Unless otherwise specified, all software contained herein is licensed
* under the Apache License, Version 2.0 (the "License");
* you may not use this software 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.
*
* Unless otherwise specified, all documentation contained herein is licensed
* under the Creative Commons License, Attribution 4.0 Intl. (the "License");
* you may not use this documentation except in compliance with the License.
* You may obtain a copy of the License at
*
* https://creativecommons.org/licenses/by/4.0/
*
* Unless required by applicable law or agreed to in writing, documentation
* 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.
*
* ============LICENSE_END============================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*/
package org.onap.portalsdk.core.service;
import java.io.File;
import java.nio.file.DirectoryStream;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.kie.api.io.ResourceType;
import org.kie.internal.KnowledgeBase;
import org.kie.internal.KnowledgeBaseFactory;
import org.kie.internal.builder.KnowledgeBuilder;
import org.kie.internal.builder.KnowledgeBuilderFactory;
import org.kie.internal.definition.KnowledgePackage;
import org.kie.internal.io.ResourceFactory;
import org.kie.internal.runtime.StatefulKnowledgeSession;
import org.onap.portalsdk.core.command.PostDroolsBean;
import org.onap.portalsdk.core.drools.DroolsRuleService;
import org.onap.portalsdk.core.logging.logic.EELFLoggerDelegate;
import org.onap.portalsdk.core.util.SystemProperties;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.fasterxml.jackson.databind.ObjectMapper;
@Service("postDroolsService")
@Transactional
public class PostDroolsServiceImpl implements PostDroolsService {
private static final EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(PostDroolsServiceImpl.class);
@Override
public String execute(String droolsFile, String className, String selectedRules) {
logger.info(EELFLoggerDelegate.applicationLogger, "Executing Drools...");
String resultsString = executeDemoRules(droolsFile, className, selectedRules);
return resultsString;
}
@Override
public List<PostDroolsBean> fetchDroolBeans() {
List<PostDroolsBean> beanList = new ArrayList<>();
Path path = FileSystems.getDefault().getPath(SystemProperties.getProperty(SystemProperties.FILES_PATH));
try (DirectoryStream<Path> stream = Files.newDirectoryStream(path, "*.{drl}")) {
for (Path entry : stream) {
PostDroolsBean postDroolsBean = new PostDroolsBean();
String fileName = entry.getName(entry.getNameCount() - 1).toString();
postDroolsBean.setDroolsFile(fileName);// sample populated
postDroolsBean.setClassName(retrieveClass(fileName));
beanList.add(postDroolsBean);
}
} catch (Exception ex) {
logger.error(EELFLoggerDelegate.errorLogger, "fetchDroolBeans failed", ex);
}
return beanList;
}
@Override
public String retrieveClass(String fileName) {
String resultsString = "";
try {
// load up the knowledge base
final KnowledgeBuilder kbuilder = loadKBuilder(fileName);
final Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages();
return pkgs.iterator().next().getFactTypes().iterator().next().getFactClass().getName();
} catch (Exception e) {
logger.error(EELFLoggerDelegate.errorLogger, "retrieveClass failed", e);
}
return resultsString;
}
protected static KnowledgeBuilder loadKBuilder(String fileName) {
final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
// this will parse and compile in one step
kbuilder.add(
ResourceFactory.newFileResource(
SystemProperties.getProperty(SystemProperties.FILES_PATH) + File.separator + fileName),
ResourceType.DRL);
// Check the builder for errors
if (kbuilder.hasErrors()) {
logger.error(EELFLoggerDelegate.errorLogger, kbuilder.getErrors().toString());
throw new IllegalArgumentException("Unable to compile \".drl\".");
}
return kbuilder;
}
@SuppressWarnings({ "deprecation", "unchecked" })
public static String executeDemoRules(String fileName, String className, String ruleValue) {
String resultsString = "";
try {
// load up the knowledge base
final KnowledgeBuilder kbuilder = loadKBuilder(fileName);
// get the compiled packages (which are serializable)
final Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages();
// add the packages to a knowledgebase (deploy the knowledge
// packages).
final KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages(pkgs);
final StatefulKnowledgeSession kSession = kbase.newStatefulKnowledgeSession();
ObjectMapper mapper = new ObjectMapper();
if (ruleValue == null || "".equals(ruleValue)) {
resultsString = "Please enter valid rule";
return resultsString;
}
List<String> selectedRules = mapper.readValue(ruleValue, List.class);
List<String> ruleResponse = new ArrayList<>();
for (String rule : selectedRules) {
Class<DroolsRuleService> clazz = (Class<DroolsRuleService>) Class.forName(className);
DroolsRuleService droolsIntroduction = clazz.newInstance();
droolsIntroduction.init(rule);
kSession.insert(droolsIntroduction);
kSession.fireAllRules();
ruleResponse.add(droolsIntroduction.getResultsString());
}
resultsString = mapper.writeValueAsString(ruleResponse);
} catch (Exception e) {
logger.error(EELFLoggerDelegate.errorLogger, "executeDemoRules failed", e);
}
return resultsString;
}
}
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