| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.atlas; |
| |
| import org.apache.atlas.security.InMemoryJAASConfiguration; |
| import org.apache.commons.configuration.Configuration; |
| import org.apache.commons.configuration.ConfigurationException; |
| import org.apache.commons.configuration.PropertiesConfiguration; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.File; |
| import java.net.URL; |
| import java.util.Iterator; |
| |
| /** |
| * Application properties used by Atlas. |
| */ |
| public final class ApplicationProperties extends PropertiesConfiguration { |
| private static final Logger LOG = LoggerFactory.getLogger(ApplicationProperties.class); |
| |
| public static final String APPLICATION_PROPERTIES = "atlas-application.properties"; |
| |
| private static volatile Configuration instance = null; |
| |
| private ApplicationProperties(URL url) throws ConfigurationException { |
| super(url); |
| } |
| |
| public static void forceReload() { |
| if (instance != null) { |
| synchronized (ApplicationProperties.class) { |
| if (instance != null) { |
| instance = null; |
| } |
| } |
| } |
| } |
| |
| public static Configuration get() throws AtlasException { |
| if (instance == null) { |
| synchronized (ApplicationProperties.class) { |
| if (instance == null) { |
| instance = get(APPLICATION_PROPERTIES); |
| InMemoryJAASConfiguration.init(instance); |
| } |
| } |
| } |
| return instance; |
| } |
| |
| public static Configuration get(String fileName) throws AtlasException { |
| String confLocation = System.getProperty("atlas.conf"); |
| try { |
| URL url = null; |
| |
| if (confLocation == null) { |
| LOG.info("Looking for {} in classpath", fileName); |
| |
| url = ApplicationProperties.class.getClassLoader().getResource(fileName); |
| |
| if (url == null) { |
| LOG.info("Looking for /{} in classpath", fileName); |
| |
| url = ApplicationProperties.class.getClassLoader().getResource("/" + fileName); |
| } |
| } else { |
| url = new File(confLocation, fileName).toURI().toURL(); |
| } |
| |
| LOG.info("Loading {} from {}", fileName, url); |
| |
| Configuration configuration = new ApplicationProperties(url).interpolatedConfiguration(); |
| logConfiguration(configuration); |
| return configuration; |
| } catch (Exception e) { |
| throw new AtlasException("Failed to load application properties", e); |
| } |
| } |
| |
| private static void logConfiguration(Configuration configuration) { |
| if (LOG.isDebugEnabled()) { |
| Iterator<String> keys = configuration.getKeys(); |
| LOG.debug("Configuration loaded:"); |
| while (keys.hasNext()) { |
| String key = keys.next(); |
| LOG.debug("{} = {}", key, configuration.getProperty(key)); |
| } |
| } |
| } |
| |
| public static Configuration getSubsetConfiguration(Configuration inConf, String prefix) { |
| return inConf.subset(prefix); |
| } |
| |
| public static Class getClass(Configuration configuration, String propertyName, String defaultValue, |
| Class assignableClass) throws AtlasException { |
| try { |
| String propertyValue = configuration.getString(propertyName, defaultValue); |
| Class<?> clazz = Class.forName(propertyValue); |
| if (assignableClass == null || assignableClass.isAssignableFrom(clazz)) { |
| return clazz; |
| } else { |
| String message = "Class " + clazz.getName() + " specified in property " + propertyName |
| + " is not assignable to class " + assignableClass.getName(); |
| LOG.error(message); |
| throw new AtlasException(message); |
| } |
| } catch (Exception e) { |
| throw new AtlasException(e); |
| } |
| } |
| } |