001/*
002 * Copyright 2012-2018 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.boot.liquibase;
018
019import liquibase.servicelocator.CustomResolverServiceLocator;
020import liquibase.servicelocator.ServiceLocator;
021import org.apache.commons.logging.Log;
022import org.apache.commons.logging.LogFactory;
023
024import org.springframework.boot.context.event.ApplicationStartingEvent;
025import org.springframework.context.ApplicationListener;
026import org.springframework.util.ClassUtils;
027
028/**
029 * {@link ApplicationListener} that replaces the liquibase {@link ServiceLocator} with a
030 * version that works with Spring Boot executable archives.
031 *
032 * @author Phillip Webb
033 * @author Dave Syer
034 */
035public class LiquibaseServiceLocatorApplicationListener
036                implements ApplicationListener<ApplicationStartingEvent> {
037
038        private static final Log logger = LogFactory
039                        .getLog(LiquibaseServiceLocatorApplicationListener.class);
040
041        @Override
042        public void onApplicationEvent(ApplicationStartingEvent event) {
043                if (ClassUtils.isPresent("liquibase.servicelocator.CustomResolverServiceLocator",
044                                event.getSpringApplication().getClassLoader())) {
045                        new LiquibasePresent().replaceServiceLocator();
046                }
047        }
048
049        /**
050         * Inner class to prevent class not found issues.
051         */
052        private static class LiquibasePresent {
053
054                public void replaceServiceLocator() {
055                        CustomResolverServiceLocator customResolverServiceLocator = new CustomResolverServiceLocator(
056                                        new SpringPackageScanClassResolver(logger));
057                        ServiceLocator.setInstance(customResolverServiceLocator);
058                }
059
060        }
061
062}