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    1   /*
    2    * Copyright 2001-2004 The Apache Software Foundation.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16
    17  package org.apache.log4j;
    18
    19  import org.apache.log4j.spi.LoggerFactory;
    20
    21  import java.util.concurrent.ConcurrentHashMap;
    22  import java.util.concurrent.ConcurrentMap;
    23
    24  /**
    25   * This class is a factory that creates and maintains org.apache.log4j.Loggers
    26   * wrapping org.slf4j.Loggers.
    27   *
    28   * It keeps a hashtable of all created org.apache.log4j.Logger instances so that
    29   * all newly created instances are not duplicates of existing loggers.
    30   *
    31   * @author S&eacute;bastien Pennec
    32   */
    33  class Log4jLoggerFactory {
    34
    35      // String, Logger
    36      private static ConcurrentMap<String, Logger> log4jLoggers = new ConcurrentHashMap<String, Logger>();
    37
    38      public static Logger getLogger(String name) {
    39          org.apache.log4j.Logger instance = log4jLoggers.get(name);
    40          if (instance != null) {
    41              return instance;
    42          } else {
    43              Logger newInstance = new Logger(name);
    44              Logger oldInstance = log4jLoggers.putIfAbsent(name, newInstance);
    45              return oldInstance == null ? newInstance : oldInstance;
    46          }
    47      }
    48
    49      public static Logger getLogger(String name, LoggerFactory loggerFactory) {
    50          org.apache.log4j.Logger instance = log4jLoggers.get(name);
    51          if (instance != null) {
    52              return instance;
    53          } else {
    54              Logger newInstance = loggerFactory.makeNewLoggerInstance(name);
    55              Logger oldInstance = log4jLoggers.putIfAbsent(name, newInstance);
    56              return oldInstance == null ? newInstance : oldInstance;
    57          }
    58      }
    59  }