org.codehaus.plexus.logging.console.ConsoleLoggerManager Maven / Gradle / Ivy

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Statistical sampling library for use in virtdata libraries, based on apache commons math 4
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package org.codehaus.plexus.logging.console;

import java.util.HashMap;
import java.util.Map;

import org.codehaus.plexus.logging.AbstractLoggerManager;
import org.codehaus.plexus.logging.Logger;
import org.codehaus.plexus.logging.LoggerManager;
import org.codehaus.plexus.personality.plexus.lifecycle.phase.Initializable;

/**
 * This is a simple logger manager that will only write the logging statements to the console.
 *
 * Sample configuration:
 *  * 
 *   org.codehaus.plexus.logging.ConsoleLoggerManager
 *   
 *     DEBUG
 *   
 * 
 * 
 * 
 * @author Jason van Zyl
 * @author Trygve Laugstøl
 * @version $Id: ConsoleLoggerManager.java 1323 2004-12-20 23:00:59Z jvanzyl $
 */
public class ConsoleLoggerManager
    extends AbstractLoggerManager
    implements LoggerManager, Initializable
{
    /**
     * Message of this level or higher will be logged. 
     * 
     * This field is set by the plexus container thus the name is 'threshold'. The field
     * currentThreshold contains the current setting of the threshold.
     */
    private String threshold = "info";

    private int currentThreshold;

    private Map loggers;

    /** The number of active loggers in use. */
    private int loggerCount;

    private boolean bootTimeLogger = false;

    /**
     */
    public ConsoleLoggerManager()
    {
    }

    /**
     * This special constructor is called directly when the container is bootstrapping itself.
     */
    public ConsoleLoggerManager( String threshold )
    {
        this.threshold = threshold;

        bootTimeLogger = true;

        initialize();
    }

    public void initialize()
    {
        debug( "Initializing ConsoleLoggerManager: " + this.hashCode() + "." );
//        if ( !bootTimeLogger )
//            new Throwable().printStackTrace(System.err);
        currentThreshold = parseThreshold( threshold );

        if ( currentThreshold == -1 )
        {
            debug( "Could not parse the threshold level: '" + threshold + "', setting to debug." );
            currentThreshold = Logger.LEVEL_DEBUG;
        }

        loggers = new HashMap();
    }

    public void setThreshold( int currentThreshold )
    {
        this.currentThreshold = currentThreshold;
    }

    /**
     * @return Returns the threshold.
     */
    public int getThreshold()
    {
        return currentThreshold;
    }

    // new stuff

    public void setThreshold( String role, String roleHint, int threshold ) {
        ConsoleLogger logger;
        String name;

        name = toMapKey( role, roleHint );
        logger = (ConsoleLogger)loggers.get( name );

        if(logger == null) {
            debug( "Trying to set the threshold of a unknown logger '" + name + "'." );
            return; // nothing to do
        }

        logger.setThreshold( threshold );
    }

    public int getThreshold( String role, String roleHint ) {
        ConsoleLogger logger;
        String name;

        name = toMapKey( role, roleHint );
        logger = (ConsoleLogger)loggers.get( name );

        if(logger == null) {
            debug( "Trying to get the threshold of a unknown logger '" + name + "'." );
            return Logger.LEVEL_DEBUG; // does not return null because that could create a NPE
        }

        return logger.getThreshold();
    }

    public Logger getLoggerForComponent( String role, String roleHint ) 
    {
        Logger logger;
        String name;

        name = toMapKey( role, roleHint );
        logger = (Logger)loggers.get( name );

        if ( logger != null )
            return logger;

        debug( "Creating logger '" + name + "' " + this.hashCode() + "." );
        logger = new ConsoleLogger( getThreshold(), name );
        loggers.put( name, logger );

        return logger;
    }

    public void returnComponentLogger( String role, String roleHint )
    {
        Object obj;
        String name;

        name = toMapKey( role, roleHint );
        obj = loggers.remove( name );

        if ( obj == null )
        {
            debug( "There was no such logger '" + name + "' " + this.hashCode() + ".");
        }
        else
        {
            debug( "Removed logger '" + name + "' " + this.hashCode() + ".");
        }
    }

    public int getActiveLoggerCount()
    {
        return loggers.size();
    }

    private int parseThreshold( String text )
    {
        text = text.trim().toLowerCase();

        if ( text.equals( "debug" ) )
        {
            return ConsoleLogger.LEVEL_DEBUG;
        }
        else if ( text.equals( "info" ) )
        {
            return ConsoleLogger.LEVEL_INFO;
        }
        else if ( text.equals( "warn" ) )
        {
            return ConsoleLogger.LEVEL_WARN;
        }
        else if ( text.equals( "error" ) )
        {
            return ConsoleLogger.LEVEL_ERROR;
        }
        else if ( text.equals( "fatal" ) )
        {
            return ConsoleLogger.LEVEL_FATAL;
        }

        return -1;
    }

    private String decodeLogLevel( int logLevel )
    {
        switch(logLevel) {
        case ConsoleLogger.LEVEL_DEBUG: return "debug";
        case ConsoleLogger.LEVEL_INFO: return "info";
        case ConsoleLogger.LEVEL_WARN: return "warn";
        case ConsoleLogger.LEVEL_ERROR: return "error";
        case ConsoleLogger.LEVEL_FATAL: return "fatal";
        case ConsoleLogger.LEVEL_DISABLED: return "disabled";
        default: return "unknown";
        }
    }

    /**
     * Remove this method and all references when this code is verified.
     *
     * @param msg
     */
    private void debug( String msg )
    {
//        if ( !bootTimeLogger )
//            System.out.println( "[Console] " + msg );
    }
}