com.github.triceo.robozonky.strategy.rules.RuleBasedInvestmentStrategyService Maven / Gradle / Ivy
/*
* Copyright 2017 Lukáš Petrovický
*
* 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 com.github.triceo.robozonky.strategy.rules;
import java.io.InputStream;
import java.util.List;
import java.util.Optional;
import com.github.triceo.robozonky.api.strategies.InvestmentStrategy;
import com.github.triceo.robozonky.api.strategies.InvestmentStrategyService;
import org.kie.api.KieServices;
import org.kie.api.builder.KieBuilder;
import org.kie.api.builder.KieFileSystem;
import org.kie.api.builder.Message;
import org.kie.api.builder.ReleaseId;
import org.kie.api.builder.model.KieModuleModel;
import org.kie.api.io.KieResources;
import org.kie.api.runtime.KieContainer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Parses and loads a Drools-based decision table. Supports XLS and XLSX as decision table file formats.
*/
public class RuleBasedInvestmentStrategyService implements InvestmentStrategyService {
private static final Logger LOGGER = LoggerFactory.getLogger(RuleBasedInvestmentStrategyService.class);
private static final ReleaseId RELEASE_ID = KieServices.Factory.get().getRepository().getDefaultReleaseId();
@Override
public Optional parse(final InputStream strategy) {
RuleBasedInvestmentStrategyService.LOGGER.trace("Parsing '{}' started.", strategy);
final KieServices kieServices = KieServices.Factory.get();
final KieModuleModel kieModuleModel = kieServices.newKieModuleModel();
final KieResources resources = kieServices.getResources();
final KieFileSystem kfs = kieServices.newKieFileSystem();
kfs.write("src/main/resources/robozonky.dtable.xls", resources.newInputStreamResource(strategy));
kfs.writeKModuleXML(kieModuleModel.toXML());
kfs.generateAndWritePomXML(RuleBasedInvestmentStrategyService.RELEASE_ID);
final KieBuilder builder = kieServices.newKieBuilder(kfs).buildAll();
final List messages = builder.getResults().getMessages(Message.Level.ERROR);
RuleBasedInvestmentStrategyService.LOGGER.trace("Parsing finished.");
if (!messages.isEmpty()) {
throw new IllegalStateException("Failed parsing decision table. Reason: " + messages);
}
final KieContainer container = kieServices.newKieContainer(RuleBasedInvestmentStrategyService.RELEASE_ID);
return Optional.of(new RuleBasedInvestmentStrategy(container));
}
}