SimpleLoggerFactory xref

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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.HashMap;
    28  import java.util.Map;
    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    final static SimpleLoggerFactory INSTANCE = new SimpleLoggerFactory();
    42
    43    Map loggerMap;
    44
    45    public SimpleLoggerFactory() {
    46      loggerMap = new HashMap();
    47    }
    48
    49    /**
    50     * Return an appropriate {@link SimpleLogger} instance by name.
    51     */
    52    public Logger getLogger(String name) {
    53      Logger slogger = null;
    54      // protect against concurrent access of the loggerMap
    55      synchronized (this) {
    56        slogger = (Logger) loggerMap.get(name);
    57        if (slogger == null) {
    58          slogger = new SimpleLogger(name);
    59          loggerMap.put(name, slogger);
    60        }
    61      }
    62      return slogger;
    63    }
    64
    65    /**
    66     * Clear the internal logger cache.
    67     *
    68     * This method is intended to be called by classes (in the same package) for
    69     * testing purposes. This method is internal. It can be modified, renamed or
    70     * removed at any time without notice.
    71     *
    72     * You are strongly discouraged from calling this method in production code.
    73     */
    74    void reset() {
    75      loggerMap.clear();
    76    }
    77  }