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Java example source code file (Log4jLoggerFactory.java)

This example Java source code file (Log4jLoggerFactory.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

concurrenthashmap, concurrentmap, log4jloggerfactory, logger, loggerfactory, threading, threads

The Log4jLoggerFactory.java Java example source code

/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed 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.log4j;

import org.apache.log4j.spi.LoggerFactory;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * This class is a factory that creates and maintains org.apache.log4j.Loggers
 * wrapping org.slf4j.Loggers.
 *
 * It keeps a hashtable of all created org.apache.log4j.Logger instances so that
 * all newly created instances are not duplicates of existing loggers.
 *
 * @author Sébastien Pennec
 */
class Log4jLoggerFactory {

    // String, Logger
    private static ConcurrentMap<String, Logger> log4jLoggers = new ConcurrentHashMap();

    public static Logger getLogger(String name) {
        org.apache.log4j.Logger instance = log4jLoggers.get(name);
        if (instance != null) {
            return instance;
        } else {
            Logger newInstance = new Logger(name);
            Logger oldInstance = log4jLoggers.putIfAbsent(name, newInstance);
            return oldInstance == null ? newInstance : oldInstance;
        }
    }

    public static Logger getLogger(String name, LoggerFactory loggerFactory) {
        org.apache.log4j.Logger instance = log4jLoggers.get(name);
        if (instance != null) {
            return instance;
        } else {
            Logger newInstance = loggerFactory.makeNewLoggerInstance(name);
            Logger oldInstance = log4jLoggers.putIfAbsent(name, newInstance);
            return oldInstance == null ? newInstance : oldInstance;
        }
    }
}

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