001 /*
002 * Copyright (C) 2012 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
024 import java.io.ByteArrayInputStream;
025 import java.io.IOException;
026 import java.util.Properties;
027 import java.util.logging.Level;
028 import java.util.logging.Logger;
029
030 public abstract class PluginLifeCycle {
031
032 /** . */
033 protected final Logger log = Logger.getLogger(getClass().getName());
034
035 /** . */
036 private PluginContext context;
037
038 /** . */
039 private Properties config;
040
041 public Properties getConfig() {
042 return config;
043 }
044
045 public void setConfig(Properties config) {
046 this.config = config;
047 }
048
049 public PluginContext getContext() {
050 return context;
051 }
052
053 protected final void start(PluginContext context) throws IllegalStateException {
054 if (this.context != null) {
055 throw new IllegalStateException("Already started");
056 }
057
058 // Get properties from system properties
059 Properties config = new Properties();
060
061 // Load properties from configuration file
062 Resource res = context.loadResource("crash.properties", ResourceKind.CONFIG);
063 if (res != null) {
064 try {
065 config.load(new ByteArrayInputStream(res.getContent()));
066 log.log(Level.FINE, "Loaded properties from " + config);
067 } catch (IOException e) {
068 log.log(Level.WARNING, "Could not configure from crash.properties", e);
069 }
070 } else {
071 log.log(Level.FINE, "Could not find crash.properties file");
072 }
073
074 // Override default properties from external config
075 if (this.config != null) {
076 config.putAll(this.config);
077 }
078
079 // Override default properties from command line
080 for (PropertyDescriptor<?> desc : PropertyDescriptor.ALL.values()) {
081 configureProperty(context, config, desc);
082 }
083
084 // Override default properties from plugin defined properties.
085 for (final CRaSHPlugin<?> plugin : context.manager.getPlugins())
086 {
087 for (PropertyDescriptor<?> descriptor : plugin.getConfigurationCapabilities()) {
088 configureProperty(context, config, descriptor);
089 }
090 }
091
092 //
093 context.start();
094
095 //
096 this.context = context;
097 }
098
099 public final void stop() throws IllegalStateException {
100 if (context == null) {
101 throw new IllegalStateException("Not started");
102 }
103 PluginContext context = this.context;
104 this.context = null;
105 context.stop();
106 }
107
108 private void configureProperty(PluginContext context, Properties props, PropertyDescriptor<?> desc) {
109 String key = "crash." + desc.name;
110 String value = props.getProperty(key);
111 if (value != null) {
112 try {
113 log.log(Level.INFO, "Configuring property " + desc.name + "=" + value + " from properties");
114 context.setProperty(desc, value);
115 }
116 catch (IllegalArgumentException e) {
117 log.log(Level.SEVERE, "Could not configure property", e);
118 }
119 }
120 }
121 }