ReconfiguratorProp.java

/*
 * JOnAS: Java(TM) Open Application Server
 * Copyright (C) 1999 Bull S.A.
 * Contact: jonas-team@objectweb.org
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *
 * Initial developer(s): Adriana Danes
 * Contributor(s):
 *
 * --------------------------------------------------------------------------
 * $Id: ReconfiguratorProp.java,v 1.4 2004/09/22 17:30:36 ehardesty Exp $
 * --------------------------------------------------------------------------
 */

package org.objectweb.jonas.management;

// general Java imports
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;
import java.util.StringTokenizer;

import org.objectweb.util.monolog.api.BasicLevel;
public class ReconfiguratorProp extends AbsReconfigurator {

    private Properties stableConfig;

    private Properties currentConfig;
   
    public ReconfiguratorProp(String name, String configFileName, Properties config) {
        super(name, configFileName);
        stableConfig = config;
        currentConfig = new Properties();
    }
    
    public void updateConfig(String key, String value, long sequence) {
        if (sequence > lastSequence) {
            currentConfig.setProperty(key, value);
            lastSequence = sequence;
            logger.log(BasicLevel.DEBUG, "- " + sequence + " - Recufigured property to update " + key + " with value : " + value);
        } else {
            logger.log(BasicLevel.WARN, "Received out of order reconfiguration message !");
            logger.log(BasicLevel.WARN, "Reconfiguration value for property " + key + " : " + value + " lost!");
        }
    }  
  
    void updateConfig(String key, String value, boolean add, long sequence) {
        if (sequence > lastSequence) {
            String oldValue = currentConfig.getProperty(key);
            if (oldValue == null)
                oldValue = stableConfig.getProperty(key);
            logger.log(BasicLevel.DEBUG, "- " + sequence + " - Recufigured property to update " + key + " having value : " + oldValue);
            String newValue = updateValue(oldValue, value, add);
            currentConfig.setProperty(key, newValue);
            lastSequence = sequence;
            logger.log(BasicLevel.DEBUG, "- " + sequence + " - Updated property " + key + " with value : " + newValue);
        } else {
            logger.log(BasicLevel.WARN, "Received out of order reconfiguration message !");
            logger.log(BasicLevel.WARN, "Reconfiguration value for property " + key + " : " + value + " lost!");
        }
    }
    void updateConfig(Properties props, long sequence) {
        if (sequence > lastSequence) {
            for(Enumeration pNames = props.propertyNames(); pNames.hasMoreElements() ; ) {  
                String aName = (String)pNames.nextElement();
                String aValue = (String)props.getProperty(aName);
                if (aValue != null) {
                    currentConfig.setProperty(aName, aValue);
                    logger.log(BasicLevel.DEBUG, "- " + sequence + " - Updated property " + aName + " with value : " + aValue);
                }
            }
            lastSequence = sequence;
        } else {
            logger.log(BasicLevel.WARN, "Received out of order reconfiguration message !");
        }
    }

    String updateValue(String oldValue, String value, boolean add) {
        value = value.trim();
        oldValue = oldValue.trim();
        String returnValue;
        if (add) {
            returnValue = new String(oldValue);
            returnValue = returnValue + ',' + value;
        } else {          
            logger.log(BasicLevel.DEBUG, "Remove " + value + " from " + oldValue);
            returnValue = new String();
            boolean firstToken = true;
            StringTokenizer st = new StringTokenizer(oldValue, ",");
            while (st.hasMoreTokens()) {
                String token = st.nextToken().trim(); 
                if (!token.equals(value)) {
                    // add the token
                    if (firstToken) {
                        returnValue = new String(token);
                        firstToken = false;
                    } else {
                        returnValue = returnValue + ',' + token;
                    }
                }
            }
        }
        return returnValue;
    }

    public void saveConfig(long sequence) throws ReconfigException {
        logger.log(BasicLevel.DEBUG, "");
        if (sequence > lastSequence) {
            // Update stableConfig with properties in currentConfig
            for (Enumeration props = currentConfig.keys() ; props.hasMoreElements() ;) {
                String reconfiguredProp = (String)props.nextElement();
                String reconfiguredPropValue = currentConfig.getProperty(reconfiguredProp);
                stableConfig.setProperty(reconfiguredProp, reconfiguredPropValue);
            }
            try {
                // Store stableConfig
                FileOutputStream fo = new FileOutputStream(configFileName);
                stableConfig.store(fo,  "Saved configuration file at ");
                fo.close();
                lastSequence = sequence;
                logger.log(BasicLevel.DEBUG, "Configuration file " + configFileName + " updated");
            } catch (FileNotFoundException e) {
                throw new ReconfigException("Cant' save configuration file: " + e.toString());
            } catch(IOException ioe) {
                throw new ReconfigException("Cant' save configuration file: " + ioe.toString());
            }
        } else {
            logger.log(BasicLevel.WARN, "Received out of order save reconfiguration message for " + name + " !");
            logger.log(BasicLevel.WARN, "Can not save !!");
            logger.log(BasicLevel.WARN, "Please reconfigure and than save !!");
            currentConfig = new Properties();
        }
    }
}

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