Java tutorial
/* * * Copyright (C) 2007-2015 Licensed to the Comunes Association (CA) under * one or more contributor license agreements (see COPYRIGHT for details). * The CA licenses this file to you under the GNU Affero General Public * License version 3, (the "License"); you may not use this file except in * compliance with the License. This file is part of kune. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */ package cc.kune.core.server.properties; import java.text.MessageFormat; import java.util.List; import org.apache.commons.configuration.CompositeConfiguration; import org.apache.commons.configuration.ConfigurationException; import org.apache.commons.configuration.PropertiesConfiguration; import org.apache.commons.configuration.SystemConfiguration; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import cc.kune.core.server.error.ServerException; import com.google.inject.Inject; import com.google.inject.Singleton; // TODO: Auto-generated Javadoc /** * The Class KunePropertiesDefault. * * @author danigb@gmail.com * @author vjrj@ourproject.org (Vicente J. Ruiz Jurado) */ @Singleton public class KunePropertiesDefault implements KuneProperties, KunePropertiesDefaultMBean { /** The Constant LOG. */ public static final Log LOG = LogFactory.getLog(KunePropertiesDefault.class); /** The config. */ private CompositeConfiguration config; /** The file name. */ private final String fileName; /** * Instantiates a new kune properties default. * * @param fileName * the file name */ @Inject public KunePropertiesDefault(final String fileName) { this.fileName = fileName; // http://stackoverflow.com/questions/40376/handle-signals-in-the-java-virtual-machine // Runtime.getRuntime().addShutdownHook() ?? // Gives some warning in openjdk // http://stackoverflow.com/questions/5023520/sending-signals-to-a-running-jvm // // sun.misc.Signal.handle(new sun.misc.Signal("HUP"), new SignalHandler() { // @Override // public void handle(final sun.misc.Signal sig) { // LOG.warn("Received SIGHUP signal. Will reload kune.properties"); // loadConfiguration(); // } // }); loadConfiguration(); } /** * Check null. * * @param key * the key * @param value * the value */ private void checkNull(final String key, final Object value) { if (value == null) { throw new ServerException( String.format("PROPERTY '%s' not defined in file %s. Please updated this configuration file.", key, fileName)); } } /* * (non-Javadoc) * * @see cc.kune.core.server.properties.KuneProperties#get(java.lang.String) */ @Override public String get(final String key) { final String value = config.getString(key); checkNull(key, value); return value; } /* * (non-Javadoc) * * @see cc.kune.core.server.properties.KuneProperties#get(java.lang.String, * java.lang.String) */ @Override public String get(final String key, final String defaultValue) { final String value = config.getString(key); return value != null ? value : defaultValue; } /* * (non-Javadoc) * * @see * cc.kune.core.server.properties.KuneProperties#getBoolean(java.lang.String) */ @Override public boolean getBoolean(final String key) { final Boolean value = config.getBoolean(key); checkNull(key, value); return value; } /* * (non-Javadoc) * * @see * cc.kune.core.server.properties.KuneProperties#getInteger(java.lang.String) */ @Override public Integer getInteger(final String key) { final Integer value = config.getInt(key); checkNull(key, value); return value; } /* * (non-Javadoc) * * @see * cc.kune.core.server.properties.KuneProperties#getList(java.lang.String) */ @Override public List<String> getList(final String key) { @SuppressWarnings("unchecked") final List<String> value = config.getList(key); checkNull(key, value); return value; } /* * (non-Javadoc) * * @see * cc.kune.core.server.properties.KuneProperties#getLong(java.lang.String) */ @Override public Long getLong(final String key) { final Long value = config.getLong(key); checkNull(key, value); return value; } /* * (non-Javadoc) * * @see * cc.kune.core.server.properties.KunePropertiesDefaultMBean#getProperty(java * .lang.String) */ @Override public String getProperty(final String key) { return this.get(key, "Value doesn't exist"); } /* * (non-Javadoc) * * @see cc.kune.core.server.properties.KuneProperties#has(java.lang.String) */ @Override public boolean has(final String key) { return config.getString(key) != null; } /** * Load configuration. */ private void loadConfiguration() { try { config = new CompositeConfiguration(); config.addConfiguration(new SystemConfiguration()); config.addConfiguration(new PropertiesConfiguration(fileName)); } catch (final ConfigurationException e) { final String msg = MessageFormat.format("Couldn't open property file {0}", fileName); throw new ServerException(msg, e); } } /* * (non-Javadoc) * * @see cc.kune.core.server.properties.KunePropertiesDefaultMBean#reload() */ @Override public void reload() { /* Don't catch any exception */ LOG.info("Reloading properties"); this.loadConfiguration(); } /* * (non-Javadoc) * * @see * cc.kune.core.server.properties.KunePropertiesDefaultMBean#setProperty(java * .lang.String, java.lang.String) */ @Override public void setProperty(final String key, final String value) { this.config.setProperty(key, value); } }