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    1   /**
    2    * Copyright (c) 2004-2011 QOS.ch
    3    * All rights reserved.
    4    *
    5    * Permission is hereby granted, free  of charge, to any person obtaining
    6    * a  copy  of this  software  and  associated  documentation files  (the
    7    * "Software"), to  deal in  the Software without  restriction, including
    8    * without limitation  the rights to  use, copy, modify,  merge, publish,
    9    * distribute,  sublicense, and/or sell  copies of  the Software,  and to
    10   * permit persons to whom the Software  is furnished to do so, subject to
    11   * the following conditions:
    12   *
    13   * The  above  copyright  notice  and  this permission  notice  shall  be
    14   * included in all copies or substantial portions of the Software.
    15   *
    16   * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
    17   * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
    18   * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
    19   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
    20   * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
    21   * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
    22   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    23   *
    24   */
    25  package org.slf4j.impl;
    26
    27  import java.util.concurrent.ConcurrentHashMap;
    28  import java.util.concurrent.ConcurrentMap;
    29
    30  import org.slf4j.Logger;
    31  import org.slf4j.ILoggerFactory;
    32
    33  /**
    34   * An implementation of {@link ILoggerFactory} which always returns
    35   * {@link SimpleLogger} instances.
    36   *
    37   * @author Ceki G&uuml;lc&uuml;
    38   */
    39  public class SimpleLoggerFactory implements ILoggerFactory {
    40
    41      ConcurrentMap<String, Logger> loggerMap;
    42
    43      public SimpleLoggerFactory() {
    44          loggerMap = new ConcurrentHashMap<String, Logger>();
    45          SimpleLogger.lazyInit();
    46      }
    47
    48      /**
    49       * Return an appropriate {@link SimpleLogger} instance by name.
    50       */
    51      public Logger getLogger(String name) {
    52          Logger simpleLogger = loggerMap.get(name);
    53          if (simpleLogger != null) {
    54              return simpleLogger;
    55          } else {
    56              Logger newInstance = new SimpleLogger(name);
    57              Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
    58              return oldInstance == null ? newInstance : oldInstance;
    59          }
    60      }
    61
    62      /**
    63       * Clear the internal logger cache.
    64       *
    65       * This method is intended to be called by classes (in the same package) for
    66       * testing purposes. This method is internal. It can be modified, renamed or
    67       * removed at any time without notice.
    68       *
    69       * You are strongly discouraged from calling this method in production code.
    70       */
    71      void reset() {
    72          loggerMap.clear();
    73      }
    74  }