alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Apache CXF example source code file (Log4jLogger.java)

This example Apache CXF source code file (Log4jLogger.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 - Apache CXF tags/keywords

handler, handlerwrapper, handlerwrapper, level, log, log4jlogger, logging, logrecord, override, priority, reflection, securityexception, securityexception, string, string, trace, trace, util

The Apache CXF Log4jLogger.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.cxf.common.logging;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;

import org.apache.log4j.Appender;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.Priority;
import org.apache.log4j.spi.LoggingEvent;

/**
 * java.util.logging.Logger implementation delegating to Log4j.
 * All methods can be used except:
 *   setLevel
 *   addHandler / getHandlers
 *   setParent / getParent
 *   setUseParentHandlers / getUseParentHandlers
 *
 * @author gnodet
 */
public class Log4jLogger extends AbstractDelegatingLogger {
    private static final Map<Level, org.apache.log4j.Level> TO_LOG4J = 
                                                new HashMap<Level, org.apache.log4j.Level>();
    private static final org.apache.log4j.Level TRACE;


    private final org.apache.log4j.Logger log;

    static {
        JDKBugHacks.doHacks();
        
        //older versions of log4j don't have TRACE, use debug
        org.apache.log4j.Level t = org.apache.log4j.Level.DEBUG;
        try {
            Field f = org.apache.log4j.Level.class.getField("TRACE");
            t = (org.apache.log4j.Level)f.get(null);
        } catch (Exception ex) {
            //ignore, assume old version of log4j
        }
        TRACE = t;
        
        TO_LOG4J.put(Level.ALL,     org.apache.log4j.Level.ALL);
        TO_LOG4J.put(Level.SEVERE,  org.apache.log4j.Level.ERROR);
        TO_LOG4J.put(Level.WARNING, org.apache.log4j.Level.WARN);
        TO_LOG4J.put(Level.INFO,    org.apache.log4j.Level.INFO);
        TO_LOG4J.put(Level.CONFIG,  org.apache.log4j.Level.DEBUG);
        TO_LOG4J.put(Level.FINE,    org.apache.log4j.Level.DEBUG);
        TO_LOG4J.put(Level.FINER,   TRACE);
        TO_LOG4J.put(Level.FINEST,  TRACE);
        TO_LOG4J.put(Level.OFF,     org.apache.log4j.Level.OFF);
    }

    public Log4jLogger(String name, String resourceBundleName) {
        super(name, resourceBundleName);
        log = org.apache.log4j.LogManager.getLogger(name);
    }

    public Level getLevel() {
        org.apache.log4j.Level l = log.getEffectiveLevel();
        if (l != null) {
            return fromL4J(l);
        }
        return null;
    }
    
    public void setLevel(Level newLevel) throws SecurityException {
        log.setLevel(TO_LOG4J.get(newLevel));
    }
    
    public synchronized void addHandler(Handler handler) throws SecurityException {
        log.addAppender(new HandlerWrapper(handler));
    }
    public synchronized void removeHandler(Handler handler) throws SecurityException {
        log.removeAppender("HandlerWrapper-" + handler.hashCode());
    }
    public synchronized Handler[] getHandlers() {
        List<Handler> ret = new ArrayList();
        Enumeration en = log.getAllAppenders();
        while (en.hasMoreElements()) {
            Appender ap = (Appender)en.nextElement();
            if (ap instanceof HandlerWrapper) {
                ret.add(((HandlerWrapper)ap).getHandler());
            }
        }
        return ret.toArray(new Handler[ret.size()]);
    }
    
    protected void internalLogFormatted(String msg, LogRecord record) {
        log.log(AbstractDelegatingLogger.class.getName(),
                TO_LOG4J.get(record.getLevel()),
                msg,
                record.getThrown());
    }


    private Level fromL4J(org.apache.log4j.Level l) {
        Level l2 = null;
        switch (l.toInt()) {
        case org.apache.log4j.Level.ALL_INT:
            l2 = Level.ALL;
            break;
        case org.apache.log4j.Level.FATAL_INT:
            l2 = Level.SEVERE;
            break;
        case org.apache.log4j.Level.ERROR_INT:
            l2 = Level.SEVERE;
            break;
        case org.apache.log4j.Level.WARN_INT:
            l2 = Level.WARNING;
            break;
        case org.apache.log4j.Level.INFO_INT:
            l2 = Level.INFO;
            break;
        case org.apache.log4j.Level.DEBUG_INT:
            l2 = Level.FINE;
            break;
        case org.apache.log4j.Level.OFF_INT:
            l2 = Level.OFF;
            break;
        default:
            if (l.toInt() == TRACE.toInt()) {
                l2 = Level.FINEST;
            } else {
                l2 = null;
            }
        } 
        return l2;
    } 
    
    
    private class HandlerWrapper extends AppenderSkeleton {
        Handler handler;
        
        public HandlerWrapper(Handler h) {
            handler = h;
            name = "HandlerWrapper-" + h.hashCode(); 
        }
        
        public Handler getHandler() {
            return handler;
        }

        @Override
        protected void append(LoggingEvent event) {
            LogRecord lr = new LogRecord(fromL4J(event.getLevel()),
                                         event.getMessage().toString());
            lr.setLoggerName(event.getLoggerName());
            if (event.getThrowableInformation() != null) {
                lr.setThrown(event.getThrowableInformation().getThrowable());
            }
            String rbname = getResourceBundleName();
            if (rbname != null) {
                lr.setResourceBundleName(rbname);
                lr.setResourceBundle(getResourceBundle());
            }
            getFullInfoForLogUtils(lr, event.fqnOfCategoryClass);
            handler.publish(lr);
        }

        public void close() {
            handler.close();
            closed = true;
        }

        public boolean requiresLayout() {
            return false;
        }    
        
        @Override
        public Priority getThreshold() {
            return TO_LOG4J.get(handler.getLevel());
        }
        @Override
        public boolean isAsSevereAsThreshold(Priority priority) {
            Priority p = getThreshold();
            return (p == null) || priority.isGreaterOrEqual(p);
        }        
    }
    private static void getFullInfoForLogUtils(LogRecord lr, String cname) {
        StackTraceElement el[] = Thread.currentThread().getStackTrace();
        for (int x = el.length - 2; x >= 0; x--) {
            if (LogUtils.class.getName().equals(el[x].getClassName())
                || cname.equals(el[x].getClassName())) {
                lr.setSourceClassName(el[x + 1].getClassName());
                lr.setSourceMethodName(el[x + 1].getMethodName());
                return;
            }
        }
    }
}

Other Apache CXF examples (source code examples)

Here is a short list of links related to this Apache CXF Log4jLogger.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.