org.java.plugin.drftpd.SynchronizedPluginLifecycleHandler.java Source code

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Here is the source code for org.java.plugin.drftpd.SynchronizedPluginLifecycleHandler.java

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/*
 * This file is part of DrFTPD, Distributed FTP Daemon.
 *
 * DrFTPD is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * DrFTPD 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with DrFTPD; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.java.plugin.drftpd;

import java.security.AccessController;
import java.security.PrivilegedAction;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.java.plugin.registry.PluginDescriptor;
import org.java.plugin.standard.StandardPluginLifecycleHandler;
import org.java.plugin.util.ExtendedProperties;

/**
 * Standard implementation of plug-in life cycle handler.
 * 
 * Creates class loaders for plugins which are synchronized using a global mutex, this
 * makes all class loading from plugin framework loaders single threaded.
 * @see org.java.plugin.standard.StandardPluginLifecycleHandler
 * 
 * @author djb61
 * @version $Id$
 */
public class SynchronizedPluginLifecycleHandler extends StandardPluginLifecycleHandler {

    private final Log log = LogFactory.getLog(getClass());
    private boolean probeParentLoaderLast;
    private boolean stickySynchronizing;
    private boolean localClassLoadingOptimization;
    private boolean foreignClassLoadingOptimization;

    /**
     * Creates synchronized implementation of plug-in class loader.
     * @see org.java.plugin.standard.StandardPluginLifecycleHandler#createPluginClassLoader(
     *      org.java.plugin.registry.PluginDescriptor)
     */
    @Override
    protected org.java.plugin.PluginClassLoader createPluginClassLoader(final PluginDescriptor descr) {
        SynchronizedPluginClassLoader result;
        if (System.getSecurityManager() != null) {
            result = AccessController.doPrivileged(new PrivilegedAction<SynchronizedPluginClassLoader>() {
                public SynchronizedPluginClassLoader run() {
                    return new SynchronizedPluginClassLoader(getPluginManager(), descr,
                            SynchronizedPluginLifecycleHandler.this.getClass().getClassLoader());
                }
            });
        } else {
            result = new SynchronizedPluginClassLoader(getPluginManager(), descr,
                    SynchronizedPluginLifecycleHandler.this.getClass().getClassLoader());
        }
        result.setProbeParentLoaderLast(probeParentLoaderLast);
        result.setStickySynchronizing(stickySynchronizing);
        result.setLocalClassLoadingOptimization(localClassLoadingOptimization);
        result.setForeignClassLoadingOptimization(foreignClassLoadingOptimization);

        return result;
    }

    /**
     * @see org.java.plugin.standard.StandardPluginLifecycleHandler#configure(
     *      ExtendedProperties)
     */
    @Override
    public void configure(ExtendedProperties config) {
        probeParentLoaderLast = "true".equalsIgnoreCase( //$NON-NLS-1$
                config.getProperty("probeParentLoaderLast", "false")); //$NON-NLS-1$ //$NON-NLS-2$
        log.debug("probeParentLoaderLast parameter value is " //$NON-NLS-1$
                + probeParentLoaderLast);
        stickySynchronizing = "true".equalsIgnoreCase( //$NON-NLS-1$
                config.getProperty("stickySynchronizing", "false")); //$NON-NLS-1$ //$NON-NLS-2$
        log.debug("stickySynchronizing parameter value is " //$NON-NLS-1$
                + stickySynchronizing);
        localClassLoadingOptimization = !"false".equalsIgnoreCase( //$NON-NLS-1$
                config.getProperty("localClassLoadingOptimization", //$NON-NLS-1$
                        "true")); //$NON-NLS-1$
        log.debug("localLoadingClassOptimization parameter value is " //$NON-NLS-1$
                + localClassLoadingOptimization);
        foreignClassLoadingOptimization = !"false".equalsIgnoreCase( //$NON-NLS-1$
                config.getProperty("foreignClassLoadingOptimization", //$NON-NLS-1$
                        "true")); //$NON-NLS-1$
        log.debug("foreignClassLoadingOptimization parameter value is " //$NON-NLS-1$
                + foreignClassLoadingOptimization);
    }
}