Java tutorial
/** * Copyright 2005-2014 The Kuali Foundation * * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php * * 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.kuali.rice.krad.datadictionary; import no.geosoft.cc.io.FileListener; import no.geosoft.cc.io.FileMonitor; import org.apache.commons.lang.StringUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.kuali.rice.core.api.config.property.ConfigurationService; import org.kuali.rice.krad.service.KRADServiceLocator; import org.kuali.rice.krad.uif.util.UifBeanFactoryPostProcessor; import org.springframework.beans.BeansException; import org.springframework.beans.factory.xml.XmlBeanDefinitionReader; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.context.ApplicationListener; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.context.event.ContextClosedEvent; import org.springframework.core.io.FileSystemResource; import org.springframework.core.io.InputStreamResource; import org.springframework.core.io.Resource; import java.io.File; import java.io.InputStream; import java.net.URL; import java.util.ArrayList; import java.util.List; /** * Extends the DataDictionary to add reloading of changed dictionary files * without a restart of the web container * * <p> * To use modify the "dataDictionaryService" spring definition * (KRADSpringBeans.xml) and change the constructor arg bean class from * "org.kuali.rice.krad.datadictionary.DataDictionary" to * "ReloadingDataDictionary" * </p> * * <p> * NOTE: For Development Purposes Only! * </p> * * @author Kuali Rice Team (rice.collab@kuali.org) */ public class ReloadingDataDictionary extends DataDictionary implements FileListener, URLMonitor.URLContentChangedListener, ApplicationContextAware { private static final Log LOG = LogFactory.getLog(DataDictionary.class); private static final String CLASS_DIR_CONFIG_PARM = "reload.data.dictionary.classes.dir"; private static final String SOURCE_DIR_CONFIG_PARM = "reload.data.dictionary.source.dir"; private static final String INTERVAL_CONFIG_PARM = "reload.data.dictionary.interval"; private URLMonitor dictionaryUrlMonitor; public ReloadingDataDictionary() { super(); } /** * After dictionary has been loaded, determine the source files and add them * to the monitor * * @see org.kuali.rice.krad.datadictionary.DataDictionary#parseDataDictionaryConfigurationFiles(boolean) */ @Override public void parseDataDictionaryConfigurationFiles(boolean allowConcurrentValidation) { ConfigurationService configurationService = KRADServiceLocator.getKualiConfigurationService(); // class directory part of the path that should be replaced String classesDir = configurationService.getPropertyValueAsString(CLASS_DIR_CONFIG_PARM); // source directory where dictionary files are found String sourceDir = configurationService.getPropertyValueAsString(SOURCE_DIR_CONFIG_PARM); // interval to poll for changes in milliseconds int reloadInterval = Integer.parseInt(configurationService.getPropertyValueAsString(INTERVAL_CONFIG_PARM)); FileMonitor dictionaryFileMonitor = new FileMonitor(reloadInterval); dictionaryUrlMonitor = new URLMonitor(reloadInterval); dictionaryUrlMonitor.addListener(this); // need to copy the configFileLocations list here because it gets // cleared out after processing by super List<String> configLocations = new ArrayList<String>(configFileLocations); super.parseDataDictionaryConfigurationFiles(allowConcurrentValidation); for (String configLocation : configLocations) { Resource classFileResource = getFileResource(configLocation); try { if (classFileResource.getURI().toString().startsWith("jar:")) { LOG.debug("Monitoring dictionary file at URI: " + classFileResource.getURI().toString()); dictionaryUrlMonitor.addURI(classFileResource.getURL()); } else { String filePathClassesDir = classFileResource.getFile().getAbsolutePath(); String sourceFilePath = StringUtils.replace(filePathClassesDir, classesDir, sourceDir); File dictionaryFile = new File(filePathClassesDir); if (dictionaryFile.exists()) { LOG.debug("Monitoring dictionary file: " + dictionaryFile.getName()); dictionaryFileMonitor.addFile(dictionaryFile); } } } catch (Exception e) { LOG.info("Exception in picking up dictionary file for monitoring: " + e.getMessage(), e); } } // add the dictionary as a listener for file changes dictionaryFileMonitor.addListener(this); } /** * Call back when a dictionary file is changed. Calls the spring bean reader * to reload the file (which will override beans as necessary and destroy * singletons) and runs the indexer * * @see no.geosoft.cc.io.FileListener#fileChanged(java.io.File) */ @Override public void fileChanged(File file) { LOG.info("reloading dictionary configuration for " + file.getName()); try { Resource resource = new FileSystemResource(file); xmlReader.loadBeanDefinitions(resource); UifBeanFactoryPostProcessor factoryPostProcessor = new UifBeanFactoryPostProcessor(); factoryPostProcessor.postProcessBeanFactory(ddBeans); // re-index ddIndex.run(); } catch (Exception e) { LOG.info("Exception in dictionary hot deploy: " + e.getMessage(), e); } } public void urlContentChanged(final URL url) { LOG.info("reloading dictionary configuration for " + url.toString()); try { InputStream urlStream = url.openStream(); InputStreamResource resource = new InputStreamResource(urlStream); int originalValidationMode = xmlReader.getValidationMode(); xmlReader.setValidationMode(XmlBeanDefinitionReader.VALIDATION_XSD); xmlReader.loadBeanDefinitions(resource); xmlReader.setValidationMode(originalValidationMode); UifBeanFactoryPostProcessor factoryPostProcessor = new UifBeanFactoryPostProcessor(); factoryPostProcessor.postProcessBeanFactory(ddBeans); // re-index ddIndex.run(); } catch (Exception e) { LOG.info("Exception in dictionary hot deploy: " + e.getMessage(), e); } } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { // register a context close handler if (applicationContext instanceof ConfigurableApplicationContext) { ConfigurableApplicationContext context = (ConfigurableApplicationContext) applicationContext; context.addApplicationListener(new ApplicationListener<ContextClosedEvent>() { @Override public void onApplicationEvent(ContextClosedEvent e) { LOG.info("Context '" + e.getApplicationContext().getDisplayName() + "' closed, shutting down URLMonitor scheduler"); dictionaryUrlMonitor.shutdownScheduler(); } }); } } }