alfresco-community-repo/source/java/org/alfresco/util/OpenOfficeConnectionTester.java

/*
 * Copyright (C) 2005-2007 Alfresco Software Limited.
 *
 * This program 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.

 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 * As a special exception to the terms and conditions of version 2.0 of 
 * the GPL, you may redistribute this Program in connection with Free/Libre 
 * and Open Source Software ("FLOSS") applications as described in Alfresco's 
 * FLOSS exception.  You should have recieved a copy of the text describing 
 * the FLOSS exception, and it is also available here: 
 * http://www.alfresco.com/legal/licensing"
 */
package org.alfresco.util;

import java.net.ConnectException;

import net.sf.jooreports.openoffice.connection.OpenOfficeConnection;

import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.i18n.I18NUtil;
import org.alfresco.repo.content.metadata.MetadataExtracterRegistry;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springframework.context.ApplicationEvent;

/**
 * A bootstrap class that checks for the presence of a valid <b>OpenOffice</b> connection, as provided by the
 * <code>net.sf.jooreports.openoffice.connection.OpenOfficeConnection</code> implementations.
 * 
 * @author Derek Hulley
 */
public class OpenOfficeConnectionTester extends AbstractLifecycleBean
{
    private static final String INFO_CONNECTION_VERIFIED = "system.openoffice.info.connection_verified";
    private static final String ERR_CONNECTION_FAILED = "system.openoffice.err.connection_failed";
    private static final String ERR_CONNECTION_LOST = "system.openoffice.err.connection_lost";
    private static final String ERR_CONNECTION_REMADE = "system.openoffice.err.connection_remade";
    
    private static Log logger = LogFactory.getLog(OpenOfficeConnectionTester.class);
    
    private OpenOfficeConnection connection;
    private boolean strict;

    public OpenOfficeConnectionTester()
    {
        this.strict = false;
    }
    
    /**
     * @param connection the <b>OpenOffice</b> connection.
     */
    public void setConnection(OpenOfficeConnection connection)
    {
        this.connection = connection;
    }
    
    /**
     * @param strict set to <tt>true</tt> to generate a failure if the connection is not connected
     *      during the {@link #checkConnection() connection check}, or false to just issue
     *      a warning.  The default is <tt>false</tt>.
     */
    public void setStrict(boolean strict)
    {
        this.strict = strict;
    }

    /**
     * @see #checkConnection()
     */
    @Override
    protected void onBootstrap(ApplicationEvent event)
    {
        checkConnection();
    }

    /**
     * Disconnect
     */
    @Override
    protected void onShutdown(ApplicationEvent event)
    {
        if(connection != null)
        {
            if(connection.isConnected())
            {
                connection.disconnect();
            }
        }
    }

    /**
     * Perform the actual connection check.  If this component is {@link #setStrict(boolean) strict},
     * then a disconnected {@link #setConnection(OpenOfficeConnection) connection} will result in a
     * runtime exception being generated.
     */
    private synchronized void checkConnection()
    {
        String connectedMessage = I18NUtil.getMessage(INFO_CONNECTION_VERIFIED);
        boolean connected = testAndConnect();
        OpenOfficeConnectionTesterJob.wasConnected = Boolean.valueOf(connected);
        if (connected)
        {
            // the connection is fine
            logger.debug(connectedMessage);
            return;
        }
        // now we have to either fail or report the connection
        String msg = I18NUtil.getMessage(ERR_CONNECTION_FAILED);
        if (strict)
        {
            throw new AlfrescoRuntimeException(msg);
        }
        else
        {
            logger.warn(msg);
        }
    }
    
    public boolean testAndConnect()
    {
        PropertyCheck.mandatory(this, "connection", connection);
        if (connection.isConnected())
        {
            // the connection is fine
            return true;
        }
        // attempt to make the connection
        try
        {
            connection.connect();
            // that worked
            return true;
        }
        catch (ConnectException e)
        {
            // No luck
            return false;
        }
    }

    /**
     * Quartz job that checks an OpenOffice connection.
     * 
     * @author Derek Hulley
     * @since 2.1.2
     */
    public static class OpenOfficeConnectionTesterJob implements Job
    {
        private static volatile Boolean wasConnected;
        
        public OpenOfficeConnectionTesterJob()
        {
        }

        /**
         * Check the connection.
         * @see OpenOfficeConnectionTester#checkConnection()
         */
        public synchronized void execute(JobExecutionContext context) throws JobExecutionException
        {
            /*
             * Synchronized just in case of overzelous triggering.
             */
            
            JobDataMap jobData = context.getJobDetail().getJobDataMap();
            // Get the connecion tester
            Object openOfficeConnectionTesterObj = jobData.get("openOfficeConnectionTester");
            if (openOfficeConnectionTesterObj == null || !(openOfficeConnectionTesterObj instanceof OpenOfficeConnectionTester))
            {
                throw new AlfrescoRuntimeException("OpenOfficeConnectionJob data must contain valid 'openOfficeConnectionTester' reference");
            }
            OpenOfficeConnectionTester openOfficeConnectionTester = (OpenOfficeConnectionTester) openOfficeConnectionTesterObj;
            
            // Get the extractor and transformer registries.  These are not mandatory.
            Object metadataExractorRegistryObj = jobData.get("metadataExractorRegistry");
            MetadataExtracterRegistry metadataExtracterRegistry = null;
            if (metadataExractorRegistryObj != null && (metadataExractorRegistryObj instanceof MetadataExtracterRegistry))
            {
                metadataExtracterRegistry = (MetadataExtracterRegistry) metadataExractorRegistryObj;
            }            
            
            // Now ping the connection.  It doesn't matter if it fails or not.
            boolean connected = openOfficeConnectionTester.testAndConnect();
            // Now log, if necessary
            if (OpenOfficeConnectionTesterJob.wasConnected == null)
            {
                // This is the first pass
            }
            else if (OpenOfficeConnectionTesterJob.wasConnected.booleanValue() == connected)
            {
                // Nothing changed since last time
            }
            else
            {
                if (connected)
                {
                    // This is reported as a warning as admins must be aware that it is bouncing
                    logger.info(I18NUtil.getMessage(ERR_CONNECTION_REMADE));
                }
                else
                {
                    logger.error(I18NUtil.getMessage(ERR_CONNECTION_LOST));
                }
                // The value changed so ensure that the registries are bounced
                if (metadataExtracterRegistry != null)
                {
                    metadataExtracterRegistry.resetCache();
                }
            }
            // Record the state
            OpenOfficeConnectionTesterJob.wasConnected = Boolean.valueOf(connected);
        }
    }
}