JCLLoggerFactory 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.apache.commons.logging.LogFactory;
    31  import org.slf4j.ILoggerFactory;
    32  import org.slf4j.Logger;
    33  import org.slf4j.helpers.Util;
    34
    35  /**
    36   * JCLLoggerFactory is an implementation of {@link ILoggerFactory} returning the
    37   * appropriately named {@link JCLLoggerAdapter} instance.
    38   *
    39   * @author Ceki G&uuml;lc&uuml;
    40   */
    41  public class JCLLoggerFactory implements ILoggerFactory {
    42
    43    private static final String JCL_DELEGATION_LOOP_URL = "http://www.slf4j.org/codes.html#jclDelegationLoop";
    44
    45    // check for delegation loops
    46    static {
    47      try {
    48        Class.forName("org.apache.commons.logging.impl.SLF4JLogFactory");
    49        String part1 = "Detected both jcl-over-slf4j.jar AND slf4j-jcl.jar on the class path, preempting StackOverflowError. ";
    50        String part2 = "See also " + JCL_DELEGATION_LOOP_URL
    51            + " for more details.";
    52
    53        Util.report(part1);
    54        Util.report(part2);
    55        throw new IllegalStateException(part1 + part2);
    56      } catch (ClassNotFoundException e) {
    57        // this is the good case
    58      }
    59    }
    60
    61    // key: name (String), value: a JCLLoggerAdapter;
    62    Map loggerMap;
    63
    64    public JCLLoggerFactory() {
    65      loggerMap = new HashMap();
    66    }
    67
    68    /*
    69     * (non-Javadoc)
    70     *
    71     * @see org.slf4j.ILoggerFactory#getLogger(java.lang.String)
    72     */
    73    public Logger getLogger(String name) {
    74      Logger logger = null;
    75      // protect against concurrent access of loggerMap
    76      synchronized (this) {
    77        logger = (Logger) loggerMap.get(name);
    78        if (logger == null) {
    79          org.apache.commons.logging.Log jclLogger = LogFactory.getLog(name);
    80          logger = new JCLLoggerAdapter(jclLogger, name);
    81          loggerMap.put(name, logger);
    82        }
    83      }
    84      return logger;
    85    }
    86  }