Java tutorial
/* * Copyright 2012-2017 the original author or authors. * * 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 org.teiid.spring.autoconfigure; import java.util.ArrayList; import java.util.Collections; import java.util.List; import javax.annotation.PostConstruct; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.boot.autoconfigure.jdbc.DataSourceInitializedEvent; import org.springframework.boot.context.config.ResourceNotFoundException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationListener; import org.springframework.core.io.Resource; import org.springframework.jdbc.config.SortedResourcesFactoryBean; /** * Bean to handle {@link TeiidServer} initialization by running * {@literal teiid.ddl} on {@link PostConstruct} on a * {@link TeiidInitializedEvent}. * * Code borrowed from {@link DataSourceInitializedEvent} */ class TeiidInitializer implements ApplicationListener<TeiidInitializedEvent> { private static final Log logger = LogFactory.getLog(TeiidInitializer.class); private final ApplicationContext applicationContext; private TeiidServer teiidServer; private boolean initialized = false; TeiidInitializer(ApplicationContext applicationContext) { this.applicationContext = applicationContext; } @PostConstruct public void init() { if (this.applicationContext.getBeanNamesForType(TeiidServer.class, false, false).length > 0) { this.teiidServer = this.applicationContext.getBean(TeiidServer.class); } if (this.teiidServer == null) { logger.debug("No DataSource found so not initializing"); return; } runSchemaScripts(); } private void runSchemaScripts() { } @Override public void onApplicationEvent(TeiidInitializedEvent event) { // NOTE the event can happen more than once and // the event datasource is not used here if (!this.initialized) { runDataScripts(); this.initialized = true; } } private void runDataScripts() { // none right now. } static List<Resource> getScripts(String propertyName, String vdb, String fallback, ApplicationContext context) { if (vdb == null) { vdb = fallback; } List<String> fallbackResources = new ArrayList<String>(); fallbackResources.add("classpath*:" + vdb); return getResources(propertyName, fallbackResources, false, context); } private static List<Resource> getResources(String propertyName, List<String> locations, boolean validate, ApplicationContext context) { List<Resource> resources = new ArrayList<Resource>(); for (String location : locations) { for (Resource resource : doGetResources(location, context)) { if (resource.exists()) { resources.add(resource); } else if (validate) { throw new ResourceNotFoundException(propertyName, resource); } } } return resources; } private static Resource[] doGetResources(String location, ApplicationContext context) { try { SortedResourcesFactoryBean factory = new SortedResourcesFactoryBean(context, Collections.singletonList(location)); factory.afterPropertiesSet(); return factory.getObject(); } catch (Exception ex) { throw new IllegalStateException("Unable to load resources from " + location, ex); } } }