pluginmanager.java

openfire 服务器源码下载

/**
 * $RCSfile$
 * $Revision: 3001 $
 * $Date: 2005-10-31 05:39:25 -0300 (Mon, 31 Oct 2005) $
 *
 * Copyright (C) 2008 Jive Software. All rights reserved.
 *
 * This software is published under the terms of the GNU Public License (GPL),
 * a copy of which is included in this distribution, or a commercial license
 * agreement with Jive.
 */

package org.jivesoftware.openfire.container;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.jivesoftware.admin.AdminConsole;
import org.jivesoftware.database.DbConnectionManager;
import org.jivesoftware.openfire.XMPPServer;
import org.jivesoftware.util.LocaleUtils;
import org.jivesoftware.util.Log;
import org.jivesoftware.util.Version;

import java.io.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
import java.util.jar.Pack200;
import java.util.zip.ZipFile;

/**
 * Loads and manages plugins. The <tt>plugins</tt> directory is monitored for any
 * new plugins, and they are dynamically loaded.<p/>
 *
 * An instance of this class can be obtained using:<p/>
 *
 * <tt>XMPPServer.getInstance().getPluginManager()</tt>
 *
 * @author Matt Tucker
 * @see Plugin
 * @see org.jivesoftware.openfire.XMPPServer#getPluginManager()
 */
public class PluginManager {

    private File pluginDirectory;
    private Map<String, Plugin> plugins;
    private Map<Plugin, PluginClassLoader> classloaders;
    private Map<Plugin, File> pluginDirs;
    /**
     * Keep track of plugin names and their unzipped files. This list is updated when plugin
     * is exploded and not when is loaded.
     */
    private Map<String, File> pluginFiles;
    private ScheduledExecutorService executor = null;
    private Map<Plugin, PluginDevEnvironment> pluginDevelopment;
    private Map<Plugin, List<String>> parentPluginMap;
    private Map<Plugin, String> childPluginMap;
    private Set<String> devPlugins;
    private PluginMonitor pluginMonitor;
    private Set<PluginListener> pluginListeners = new CopyOnWriteArraySet<PluginListener>();
    private Set<PluginManagerListener> pluginManagerListeners = new CopyOnWriteArraySet<PluginManagerListener>();

    /**
     * Constructs a new plugin manager.
     *
     * @param pluginDir the plugin directory.
     */
    public PluginManager(File pluginDir) {
        this.pluginDirectory = pluginDir;
        plugins = new ConcurrentHashMap<String, Plugin>();
        pluginDirs = new HashMap<Plugin, File>();
        pluginFiles = new HashMap<String, File>();
        classloaders = new HashMap<Plugin, PluginClassLoader>();
        pluginDevelopment = new HashMap<Plugin, PluginDevEnvironment>();
        parentPluginMap = new HashMap<Plugin, List<String>>();
        childPluginMap = new HashMap<Plugin, String>();
        devPlugins = new HashSet<String>();
        pluginMonitor = new PluginMonitor();
    }

    /**
     * Starts plugins and the plugin monitoring service.
     */
    public void start() {
        executor = new ScheduledThreadPoolExecutor(1);
        // See if we're in development mode. If so, check for new plugins once every 5 seconds.
        // Otherwise, default to every 20 seconds.
        if (Boolean.getBoolean("developmentMode")) {
            executor.scheduleWithFixedDelay(pluginMonitor, 0, 5, TimeUnit.SECONDS);
        }
        else {
            executor.scheduleWithFixedDelay(pluginMonitor, 0, 20, TimeUnit.SECONDS);
        }
    }

    /**
     * Shuts down all running plugins.
     */
    public void shutdown() {
        // Stop the plugin monitoring service.
        if (executor != null) {
            executor.shutdown();
        }
        // Shutdown all installed plugins.
        for (Plugin plugin : plugins.values()) {
            try {
                plugin.destroyPlugin();
            }
            catch (Exception e) {
                Log.error(e);
            }
        }
        plugins.clear();
        pluginDirs.clear();
        pluginFiles.clear();
        classloaders.clear();
        pluginDevelopment.clear();
        childPluginMap.clear();
        pluginMonitor = null;
    }

    /**
     * Installs or updates an existing plugin.
     *
     * @param in the input stream that contains the new plugin definition.
     * @param pluginFilename the filename of the plugin to create or update.
     * @return true if the plugin was successfully installed or updated.
     */
    public boolean installPlugin(InputStream in, String pluginFilename) {
        if (in == null || pluginFilename == null || pluginFilename.length() < 1) {
            Log.error("Error installing plugin: Input stream was null or pluginFilename was null or had no length.");
            return false;
        }
        try {
            byte[] b = new byte[1024];
            int len;
            // If pluginFilename is a path instead of a simple file name, we only want the file name
            int index = pluginFilename.lastIndexOf(File.separator);
            if (index != -1) {
                pluginFilename = pluginFilename.substring(index+1);
            }
            // Absolute path to the plugin file
            String absolutePath = pluginDirectory + File.separator + pluginFilename;
            // Save input stream contents to a temp file
            OutputStream out = new FileOutputStream(absolutePath + ".part");
            while ((len = in.read(b)) != -1) {
                     //write byte to file
                     out.write(b, 0, len);
            }
            out.close();
            // Delete old .jar (if it exists)
            new File(absolutePath).delete();
            // Rename temp file to .jar
            new File(absolutePath + ".part").renameTo(new File(absolutePath));
            // Ask the plugin monitor to update the plugin immediately.
            pluginMonitor.run();
        }
        catch (IOException e) {
            Log.error("Error installing new version of plugin: " + pluginFilename, e);
            return false;
        }
        return true;
    }

    /**
     * Returns true if the specified filename, that belongs to a plugin, exists.
     *
     * @param pluginFilename the filename of the plugin to create or update.
     * @return true if the specified filename, that belongs to a plugin, exists.
     */
    public boolean isPluginDownloaded(String pluginFilename) {
        return new File(pluginDirectory + File.separator + pluginFilename).exists();
    }

    /**
     * Returns a Collection of all installed plugins.
     *
     * @return a Collection of all installed plugins.
     */
    public Collection<Plugin> getPlugins() {
        return Collections.unmodifiableCollection(plugins.values());
    }

    /**
     * Returns a plugin by name or <tt>null</tt> if a plugin with that name does not
     * exist. The name is the name of the directory that the plugin is in such as
     * "broadcast".
     *
     * @param name the name of the plugin.
     * @return the plugin.
     */
    public Plugin getPlugin(String name) {
        return plugins.get(name);
    }

    /**
     * Returns the plugin's directory.
     *
     * @param plugin the plugin.
     * @return the plugin's directory.
     */
    public File getPluginDirectory(Plugin plugin) {
        return pluginDirs.get(plugin);
    }

    /**
     * Returns the JAR or WAR file that created the plugin.
     *
     * @param name the name of the plugin.
     * @return the plugin JAR or WAR file.
     */
    public File getPluginFile(String name) {
        return pluginFiles.get(name);
    }

    /**
     * Returns true if at least one attempt to load plugins has been done. A true value does not mean
     * that available plugins have been loaded nor that plugins to be added in the future are already
     * loaded. :)<p>
     *
     * TODO Current version does not consider child plugins that may be loaded in a second attempt. It either
     * TODO consider plugins that were found but failed to be loaded due to some error.
     *
     * @return true if at least one attempt to load plugins has been done.
     */
    public boolean isExecuted() {
        return pluginMonitor.executed;
    }

    /**
     * Loads a plug-in module into the container. Loading consists of the
     * following steps:<ul>
     * <p/>
     * <li>Add all jars in the <tt>lib</tt> dir (if it exists) to the class loader</li>
     * <li>Add all files in <tt>classes</tt> dir (if it exists) to the class loader</li>
     * <li>Locate and load <tt>module.xml</tt> into the context</li>
     * <li>For each jive.module entry, load the given class as a module and start it</li>
     * <p/>
     * </ul>
     *
     * @param pluginDir the plugin directory.
     */
    private void loadPlugin(File pluginDir) {
        // Only load the admin plugin during setup mode.
        if (XMPPServer.getInstance().isSetupMode() && !(pluginDir.getName().equals("admin"))) {
            return;
        }
        Log.debug("PluginManager: Loading plugin " + pluginDir.getName());
        Plugin plugin;
        try {
            File pluginConfig = new File(pluginDir, "plugin.xml");
            if (pluginConfig.exists()) {
                SAXReader saxReader = new SAXReader();
                saxReader.setEncoding("UTF-8");
                Document pluginXML = saxReader.read(pluginConfig);

                // See if the plugin specifies a version of Openfire
                // required to run.
                Element minServerVersion = (Element)pluginXML.selectSingleNode("/plugin/minServerVersion");
                if (minServerVersion != null) {
                    String requiredVersion = minServerVersion.getTextTrim();
                    Version version = XMPPServer.getInstance().getServerInfo().getVersion();
                    String hasVersion = version.getMajor() + "." + version.getMinor() + "." +
                        version.getMicro();
                    if (hasVersion.compareTo(requiredVersion) < 0) {
                        String msg = "Ignoring plugin " + pluginDir.getName() + ": requires " +
                            "server version " + requiredVersion;
                        Log.warn(msg);
                        System.out.println(msg);
                        return;
                    }
                }

                PluginClassLoader pluginLoader;

                // Check to see if this is a child plugin of another plugin. If it is, we
                // re-use the parent plugin's class loader so that the plugins can interact.
                Element parentPluginNode = (Element)pluginXML.selectSingleNode("/plugin/parentPlugin");

                String pluginName = pluginDir.getName();
                String webRootKey = pluginName + ".webRoot";
                String classesDirKey = pluginName + ".classes";
                String webRoot = System.getProperty(webRootKey);
                String classesDir = System.getProperty(classesDirKey);

                if (webRoot != null) {
                    final File compilationClassesDir = new File(pluginDir, "classes");
                    if (!compilationClassesDir.exists()) {
                        compilationClassesDir.mkdir();
                    }
                    compilationClassesDir.deleteOnExit();
                }

                if (parentPluginNode != null) {
                    String parentPlugin = parentPluginNode.getTextTrim();
                    // See if the parent is already loaded.