Java tutorial
/** * */ package com.thinkbiganalytics.server.upgrade; /*- * #%L * kylo-operational-metadata-upgrade-service * %% * Copyright (C) 2017 ThinkBig Analytics * %% * 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. * #L% */ import org.apache.commons.lang3.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.boot.SpringApplication; import org.springframework.boot.builder.SpringApplicationBuilder; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.thinkbiganalytics.KyloVersion; import com.thinkbiganalytics.KyloVersionUtil; /** * Performs all upgrade steps within a metadata transaction. */ public class KyloUpgrader { private static final Logger log = LoggerFactory.getLogger(KyloUpgrader.class); public static final String KYLO_UPGRADE = "kyloUpgrade"; public void upgrade() { System.setProperty(SpringApplication.BANNER_LOCATION_PROPERTY, "upgrade-banner.txt"); ConfigurableApplicationContext upgradeCxt = new SpringApplicationBuilder(KyloUpgradeConfig.class).web(true) .profiles(KYLO_UPGRADE).run(); try { KyloUpgradeService upgradeService = upgradeCxt.getBean(KyloUpgradeService.class); // Keep upgrading until upgrade() returns true, i.e. we are up-to-date; while (!upgradeService.upgradeNext()) ; } finally { upgradeCxt.close(); } } public boolean isUpgradeRequired() { KyloVersion buildVer = KyloVersionUtil.getBuildVersion(); KyloVersion currentVer = getCurrentVersion(); return currentVer == null || !buildVer.matches(currentVer.getMajorVersion(), currentVer.getMinorVersion(), currentVer.getPointVersion()); } /** * Return the database version for Kylo. * * @return the version of Kylo stored in the database */ public KyloVersion getCurrentVersion() { String profiles = System.getProperty("spring.profiles.active", ""); if (!profiles.contains("native")) { profiles = StringUtils.isEmpty(profiles) ? "native" : profiles + ",native"; System.setProperty("spring.profiles.active", profiles); } //Spring is needed to load the Spring Cloud context so we can decrypt the passwords for the database connection ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext( "kylo-upgrade-check-application-context.xml"); ctx.refresh(); KyloUpgradeDatabaseVersionChecker upgradeDatabaseVersionChecker = (KyloUpgradeDatabaseVersionChecker) ctx .getBean("kyloUpgradeDatabaseVersionChecker"); KyloVersion kyloVersion = upgradeDatabaseVersionChecker.getDatabaseVersion(); ctx.close(); return kyloVersion; } }