Tomcat example source code file (DirectJDKLog.java)

This example Tomcat source code file (DirectJDKLog.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Tomcat tags/keywords

directjdklog, directjdklog, formatter, handler, level, log, log, logger, logging, simple_fmt, stacktraceelement, string, string, throwable, throwable

The Tomcat DirectJDKLog.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.juli.logging;

import java.util.logging.ConsoleHandler;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;


/** 
 * Hardcoded java.util.logging commons-logging implementation.
 * 
 * In addition, it curr 
 * 
 */
class DirectJDKLog implements Log {
    // no reason to hide this - but good reasons to not hide
    public Logger logger;
    
    /** Alternate config reader and console format 
     */
    private static final String SIMPLE_FMT="org.apache.tomcat.util.log.JdkLoggerFormatter";
    private static final String SIMPLE_CFG="org.apache.tomcat.util.log.JdkLoggerConfig";

    static {
        if( System.getProperty("java.util.logging.config.class") ==null  &&
                System.getProperty("java.util.logging.config.file") ==null ) {
            // default configuration - it sucks. Let's override at least the 
            // formatter for the console
            try {
                Class.forName(SIMPLE_CFG).newInstance();                
            } catch( Throwable t ) {                
            }
            try {
                Formatter fmt=(Formatter)Class.forName(SIMPLE_FMT).newInstance();
                // it is also possible that the user modifed jre/lib/logging.properties - 
                // but that's really stupid in most cases
                Logger root=Logger.getLogger("");
                Handler handlers[]=root.getHandlers();
                for( int i=0; i< handlers.length; i++ ) {
                    // I only care about console - that's what's used in default config anyway
                    if( handlers[i] instanceof  ConsoleHandler ) {
                        handlers[i].setFormatter(fmt);
                    }
                }
            } catch( Throwable t ) {
                // maybe it wasn't included - the ugly default will be used.
            }
            
        }
    }
    
    public DirectJDKLog(String name ) {
        logger=Logger.getLogger(name);        
    }
    
    public final boolean isErrorEnabled() {
        return logger.isLoggable(Level.SEVERE);
    }
    
    public final boolean isWarnEnabled() {
        return logger.isLoggable(Level.WARNING); 
    }
    
    public final boolean isInfoEnabled() {
        return logger.isLoggable(Level.INFO);
    }
    
    public final boolean isDebugEnabled() {
        return logger.isLoggable(Level.FINE);
    }
    
    public final boolean isFatalEnabled() {
        return logger.isLoggable(Level.SEVERE);
    }
    
    public final boolean isTraceEnabled() {
        return logger.isLoggable(Level.FINER);
    }
    
    public final void debug(Object message) {
        log(Level.FINE, String.valueOf(message), null);
    }
    
    public final void debug(Object message, Throwable t) {
        log(Level.FINE, String.valueOf(message), t);
    }
    
    public final void trace(Object message) {
        log(Level.FINER, String.valueOf(message), null);
    }
    
    public final void trace(Object message, Throwable t) {
        log(Level.FINER, String.valueOf(message), t);
    }
    
    public final void info(Object message) {
        log(Level.INFO, String.valueOf(message), null);
    }
    
    public final void info(Object message, Throwable t) {        
        log(Level.INFO, String.valueOf(message), t);
    }
    
    public final void warn(Object message) {
        log(Level.WARNING, String.valueOf(message), null);
    }
    
    public final void warn(Object message, Throwable t) {
        log(Level.WARNING, String.valueOf(message), t);
    }
    
    public final void error(Object message) {
        log(Level.SEVERE, String.valueOf(message), null);
    }
    
    public final void error(Object message, Throwable t) {
        log(Level.SEVERE, String.valueOf(message), t);
    }
    
    public final void fatal(Object message) {
        log(Level.SEVERE, String.valueOf(message), null);
    }
    
    public final void fatal(Object message, Throwable t) {
        log(Level.SEVERE, String.valueOf(message), t);
    }    

    // from commons logging. This would be my number one reason why java.util.logging
    // is bad - design by comitee can be really bad ! The impact on performance of 
    // using java.util.logging - and the ugliness if you need to wrap it - is far
    // worse than the unfriendly and uncommon default format for logs. 
    
    private void log( Level level, String msg, Throwable ex ) {
        if (logger.isLoggable(level)) {
            // Hack (?) to get the stack trace.
            Throwable dummyException=new Throwable();
            StackTraceElement locations[]=dummyException.getStackTrace();
            // Caller will be the third element
            String cname="unknown";
            String method="unknown";
            if( locations!=null && locations.length >2 ) {
                StackTraceElement caller=locations[2];
                cname=caller.getClassName();
                method=caller.getMethodName();
            }
            if( ex==null ) {
                logger.logp( level, cname, method, msg );
            } else {
                logger.logp( level, cname, method, msg, ex );
            }
        }
    }        

    // for LogFactory
    static void release() {
        
    }
    
    static Log getInstance(String name) {
        return new DirectJDKLog( name );
    }
}