001 /*
002 * Copyright (C) 2010 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020 package org.crsh.plugin;
021
022 import org.crsh.vfs.Resource;
023 import org.slf4j.Logger;
024 import org.slf4j.LoggerFactory;
025
026 import java.io.IOException;
027 import java.io.InputStream;
028 import java.net.URL;
029 import java.util.Properties;
030
031 /**
032 * Controls the life cycle of a plugin manager.
033 *
034 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
035 * @version $Revision$
036 */
037 public abstract class PluginLifeCycle {
038
039 /** . */
040 protected final Logger log = LoggerFactory.getLogger(getClass());
041
042 /** . */
043 private PluginContext context;
044
045 public PluginContext getContext() {
046 return context;
047 }
048
049 protected final void start(PluginContext context) throws IllegalStateException {
050 if (this.context != null) {
051 throw new IllegalStateException("Already started");
052 }
053
054 // Get properties from system properties
055 Properties props = new Properties();
056
057 // Load properties from configuration file
058 Resource res = context.loadResource("crash.properties", ResourceKind.CONFIG);
059 if (res != null) {
060 try {
061 URL url = res.getURL();
062 InputStream in = url.openStream();
063 props.load(in);
064 log.debug("Loaded properties from " + url + " " + props);
065 } catch (IOException e) {
066 log.warn("Could not configure from crash.properties", e);
067 }
068 } else {
069 log.debug("Could not find crash.properties file");
070 }
071
072 // Override default properties from System properties
073 props.putAll(System.getProperties());
074
075 // Override default properties from command line
076 for (PropertyDescriptor<?> desc : PropertyDescriptor.ALL.values()) {
077 configureProperty(context, props, desc);
078 }
079
080 // Override default properties from plugin defined properties.
081 for (final CRaSHPlugin<?> plugin : context.manager.getPlugins())
082 {
083 for (PropertyDescriptor<?> descriptor : plugin.getConfigurationCapabilities()) {
084 configureProperty(context, props, descriptor);
085 }
086 }
087
088 //
089 context.start();
090
091 //
092 this.context = context;
093 }
094
095 public final void stop() throws IllegalStateException {
096 if (context == null) {
097 throw new IllegalStateException("Not started");
098 }
099 PluginContext context = this.context;
100 this.context = null;
101 context.stop();
102 }
103
104 private void configureProperty(PluginContext context, Properties props, PropertyDescriptor<?> desc) {
105 String key = "crash." + desc.name;
106 String value = props.getProperty(key);
107 if (value != null) {
108 try {
109 log.info("Configuring property " + desc.name + "=" + value + " from properties");
110 context.setProperty(desc, value);
111 }
112 catch (IllegalArgumentException e) {
113 log.error("Could not configure property", e);
114 }
115 }
116 }
117 }