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StandardLogger.java

/*
 Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA



 */
package com.mysql.jdbc.log;

import java.util.Date;

import com.mysql.jdbc.Util;
import com.mysql.jdbc.profiler.ProfilerEvent;

/**
 * Provides logging facilities for those platforms that don't have built-in
 * facilities. Simply logs messages to STDERR.
 * 
 * @author Mark Matthews
 * 
 * @version $Id$
 */
00041 public class StandardLogger implements Log {
      private static final int FATAL = 0;

      private static final int ERROR = 1;

      private static final int WARN = 2;

      private static final int INFO = 3;

      private static final int DEBUG = 4;

      private static final int TRACE = 5;

      public static StringBuffer bufferedLog = null;

      private boolean logLocationInfo = true;

      /**
       * Creates a new StandardLogger object.
       * 
       * @param name
       *            the name of the configuration to use -- ignored
       */
00064       public StandardLogger(String name) {
            this(name, false);
      }

      public StandardLogger(String name, boolean logLocationInfo) {
            this.logLocationInfo = logLocationInfo;
      }

      public static void saveLogsToBuffer() {
            if (bufferedLog == null) {
                  bufferedLog = new StringBuffer();
            }
      }

      /**
       * @see com.mysql.jdbc.log.Log#isDebugEnabled()
       */
00081       public boolean isDebugEnabled() {
            return true;
      }

      /**
       * @see com.mysql.jdbc.log.Log#isErrorEnabled()
       */
00088       public boolean isErrorEnabled() {
            return true;
      }

      /**
       * @see com.mysql.jdbc.log.Log#isFatalEnabled()
       */
00095       public boolean isFatalEnabled() {
            return true;
      }

      /**
       * @see com.mysql.jdbc.log.Log#isInfoEnabled()
       */
00102       public boolean isInfoEnabled() {
            return true;
      }

      /**
       * @see com.mysql.jdbc.log.Log#isTraceEnabled()
       */
00109       public boolean isTraceEnabled() {
            return true;
      }

      /**
       * @see com.mysql.jdbc.log.Log#isWarnEnabled()
       */
00116       public boolean isWarnEnabled() {
            return true;
      }

      /**
       * Logs the given message instance using the 'debug' level
       * 
       * @param message
       *            the message to log
       */
00126       public void logDebug(Object message) {
            logInternal(DEBUG, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'debug' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00138       public void logDebug(Object message, Throwable exception) {
            logInternal(DEBUG, message, exception);
      }

      /**
       * Logs the given message instance using the 'error' level
       * 
       * @param message
       *            the message to log
       */
00148       public void logError(Object message) {
            logInternal(ERROR, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'error' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00160       public void logError(Object message, Throwable exception) {
            logInternal(ERROR, message, exception);
      }

      /**
       * Logs the given message instance using the 'fatal' level
       * 
       * @param message
       *            the message to log
       */
00170       public void logFatal(Object message) {
            logInternal(FATAL, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'fatal' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00182       public void logFatal(Object message, Throwable exception) {
            logInternal(FATAL, message, exception);
      }

      /**
       * Logs the given message instance using the 'info' level
       * 
       * @param message
       *            the message to log
       */
00192       public void logInfo(Object message) {
            logInternal(INFO, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'info' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00204       public void logInfo(Object message, Throwable exception) {
            logInternal(INFO, message, exception);
      }

      /**
       * Logs the given message instance using the 'trace' level
       * 
       * @param message
       *            the message to log
       */
00214       public void logTrace(Object message) {
            logInternal(TRACE, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'trace' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00226       public void logTrace(Object message, Throwable exception) {
            logInternal(TRACE, message, exception);
      }

      /**
       * Logs the given message instance using the 'warn' level
       * 
       * @param message
       *            the message to log
       */
00236       public void logWarn(Object message) {
            logInternal(WARN, message, null);
      }

      /**
       * Logs the given message and Throwable at the 'warn' level.
       * 
       * @param message
       *            the message to log
       * @param exception
       *            the throwable to log (may be null)
       */
00248       public void logWarn(Object message, Throwable exception) {
            logInternal(WARN, message, exception);
      }

      private void logInternal(int level, Object msg, Throwable exception) {
            StringBuffer msgBuf = new StringBuffer();
            msgBuf.append(new Date().toString());
            msgBuf.append(" ");

            switch (level) {
            case FATAL:
                  msgBuf.append("FATAL: ");

                  break;

            case ERROR:
                  msgBuf.append("ERROR: ");

                  break;

            case WARN:
                  msgBuf.append("WARN: ");

                  break;

            case INFO:
                  msgBuf.append("INFO: ");

                  break;

            case DEBUG:
                  msgBuf.append("DEBUG: ");

                  break;

            case TRACE:
                  msgBuf.append("TRACE: ");

                  break;
            }

            if (msg instanceof ProfilerEvent) {
                  msgBuf.append(LogUtils.expandProfilerEventIfNecessary(msg));

            } else {
                  if (this.logLocationInfo && level != TRACE) {
                        Throwable locationException = new Throwable();
                        msgBuf.append(LogUtils
                                    .findCallingClassAndMethod(locationException));
                        msgBuf.append(" ");
                  }
                  
                  if (msg != null) {
                        msgBuf.append(String.valueOf(msg));
                  }
            }

            if (exception != null) {
                  msgBuf.append("\n");
                  msgBuf.append("\n");
                  msgBuf.append("EXCEPTION STACK TRACE:");
                  msgBuf.append("\n");
                  msgBuf.append("\n");
                  msgBuf.append(Util.stackTraceToString(exception));
            }

            String messageAsString = msgBuf.toString();

            System.err.println(messageAsString);

            if (bufferedLog != null) {
                  bufferedLog.append(messageAsString);
            }
      }
}

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