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    1   /*
    2    *  Licensed to the Apache Software Foundation (ASF) under one
    3    *  or more contributor license agreements.  See the NOTICE file
    4    *  distributed with this work for additional information
    5    *  regarding copyright ownership.  The ASF licenses this file
    6    *  to you under the Apache License, Version 2.0 (the
    7    *  "License"); you may not use this file except in compliance
    8    *  with the License.  You may obtain a copy of the License at
    9    *
    10   *    http://www.apache.org/licenses/LICENSE-2.0
    11   *
    12   *  Unless required by applicable law or agreed to in writing,
    13   *  software distributed under the License is distributed on an
    14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    15   *  KIND, either express or implied.  See the License for the
    16   *  specific language governing permissions and limitations
    17   *  under the License.
    18   *
    19   */
    20  package org.apache.mina.util;
    21
    22  import org.apache.mina.common.IoSession;
    23  import org.slf4j.Logger;
    24  import org.slf4j.LoggerFactory;
    25
    26  /**
    27   * Provides utility methods to log protocol-specific messages.
    28   * <p>
    29   * Set {@link #PREFIX} and {@link #LOGGER} session attributes
    30   * to override prefix string and logger.
    31   *
    32   * @author The Apache Directory Project (mina-dev@directory.apache.org)
    33   * @version $Rev: 555855 $, $Date: 2007-07-13 05:19:00 +0200 (Fri, 13 Jul 2007) $
    34   *
    35   */
    36  public class SessionLog {
    37      /**
    38       * Session attribute key: prefix string
    39       */
    40      public static final String PREFIX = SessionLog.class.getName() + ".prefix";
    41
    42      /**
    43       * Session attribute key: {@link Logger}
    44       */
    45      public static final String LOGGER = SessionLog.class.getName() + ".logger";
    46
    47      private static Class getClass(IoSession session) {
    48          return session.getHandler().getClass();
    49      }
    50
    51      public static void debug(IoSession session, String message) {
    52          Logger log = getLogger(session);
    53          if (log.isDebugEnabled()) {
    54              log.debug(String.valueOf(session.getAttribute(PREFIX)) + message);
    55          }
    56      }
    57
    58      public static void debug(IoSession session, String message, Throwable cause) {
    59          Logger log = getLogger(session);
    60          if (log.isDebugEnabled()) {
    61              log.debug(String.valueOf(session.getAttribute(PREFIX)) + message,
    62                      cause);
    63          }
    64      }
    65
    66      public static void info(IoSession session, String message) {
    67          Logger log = getLogger(session);
    68          if (log.isInfoEnabled()) {
    69              log.info(String.valueOf(session.getAttribute(PREFIX)) + message);
    70          }
    71      }
    72
    73      public static void info(IoSession session, String message, Throwable cause) {
    74          Logger log = getLogger(session);
    75          if (log.isInfoEnabled()) {
    76              log.info(String.valueOf(session.getAttribute(PREFIX)) + message,
    77                      cause);
    78          }
    79      }
    80
    81      public static void warn(IoSession session, String message) {
    82          Logger log = getLogger(session);
    83          if (log.isWarnEnabled()) {
    84              log.warn(String.valueOf(session.getAttribute(PREFIX)) + message);
    85          }
    86      }
    87
    88      public static void warn(IoSession session, String message, Throwable cause) {
    89          Logger log = getLogger(session);
    90          if (log.isWarnEnabled()) {
    91              log.warn(String.valueOf(session.getAttribute(PREFIX)) + message,
    92                      cause);
    93          }
    94      }
    95
    96      public static void error(IoSession session, String message) {
    97          Logger log = getLogger(session);
    98          if (log.isErrorEnabled()) {
    99              log.error(String.valueOf(session.getAttribute(PREFIX)) + message);
    100         }
    101     }
    102
    103     public static void error(IoSession session, String message, Throwable cause) {
    104         Logger log = getLogger(session);
    105         if (log.isErrorEnabled()) {
    106             log.error(String.valueOf(session.getAttribute(PREFIX)) + message,
    107                     cause);
    108         }
    109     }
    110
    111     public static boolean isDebugEnabled(IoSession session) {
    112         return getLogger(session).isDebugEnabled();
    113     }
    114
    115     public static boolean isInfoEnabled(IoSession session) {
    116         return getLogger(session).isInfoEnabled();
    117     }
    118
    119     public static boolean isWarnEnabled(IoSession session) {
    120         return getLogger(session).isWarnEnabled();
    121     }
    122
    123     public static boolean isErrorEnabled(IoSession session) {
    124         return getLogger(session).isErrorEnabled();
    125     }
    126
    127     private static Logger getLogger(IoSession session) {
    128         Logger log = (Logger) session.getAttribute(LOGGER);
    129         if (log == null) {
    130             log = LoggerFactory.getLogger(getClass(session));
    131             String prefix = (String) session.getAttribute(PREFIX);
    132             if (prefix == null) {
    133                 prefix = "[" + session.getRemoteAddress() + "] ";
    134                 session.setAttribute(PREFIX, prefix);
    135             }
    136
    137             session.setAttribute(LOGGER, log);
    138         }
    139
    140         return log;
    141     }
    142 }