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.standalone;
021    
022    import org.crsh.plugin.PluginContext;
023    import org.crsh.plugin.PluginLifeCycle;
024    import org.crsh.plugin.ServiceLoaderDiscovery;
025    import org.crsh.util.Utils;
026    import org.crsh.vfs.FS;
027    import org.crsh.vfs.Path;
028    import org.slf4j.Logger;
029    import org.slf4j.LoggerFactory;
030    
031    import java.io.File;
032    import java.net.URL;
033    import java.net.URLClassLoader;
034    import java.util.List;
035    
036    /**
037     * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
038     * @version $Revision$
039     */
040    public class Bootstrap extends PluginLifeCycle {
041    
042      /** . */
043      protected final Logger log = LoggerFactory.getLogger(getClass());
044    
045      /** The mounted path on the file system. */
046      private List<File> mounts = Utils.newArrayList();
047    
048      /** The class path. */
049      private List<File> classPath = Utils.newArrayList();
050    
051      /** The base classloader. */
052      private ClassLoader baseLoader;
053    
054      public Bootstrap(ClassLoader baseLoader) throws NullPointerException {
055        if (baseLoader == null) {
056          throw new NullPointerException("No null base loader accepted");
057        }
058        this.baseLoader = baseLoader;
059      }
060    
061      public Bootstrap addToMounts(File file) {
062        mounts.add(file);
063        return this;
064      }
065    
066      public Bootstrap addToClassPath(File file) {
067        classPath.add(file);
068        return this;
069      }
070    
071      public void bootstrap() throws Exception {
072    
073        // Compute the url classpath
074        URL[] urls = new URL[classPath.size()];
075        for (int i = 0;i < urls.length;i++) {
076          urls[i] = classPath.get(i).toURI().toURL();
077        }
078    
079        // Create the classloader
080        URLClassLoader classLoader = new URLClassLoader(urls, baseLoader);
081    
082        // Create the virtual file system
083        FS fs = new FS();
084        for (File file : mounts) {
085          fs.mount(file);
086        }
087        fs.mount(classLoader, Path.get("/crash/"));
088    
089        // The service loader discovery
090        ServiceLoaderDiscovery discovery = new ServiceLoaderDiscovery(classLoader);
091    
092        //
093        StringBuilder info = new StringBuilder("Booting crash with classpath=");
094        info.append(classPath).append(" and mounts=[");
095        for (int i = 0;i < mounts.size();i++) {
096          if (i > 0) {
097            info.append(',');
098          }
099          info.append(mounts.get(i).getAbsolutePath());
100        }
101        info.append(']');
102        log.info(info.toString());
103    
104        //
105        PluginContext context = new PluginContext(discovery, fs, classLoader);
106        context.refresh();
107        start(context);
108      }
109    
110      public void shutdown() {
111        stop();
112      }
113    }