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From d...@apache.org
Subject cvs commit: incubator-geronimo/modules/core/src/java/org/apache/geronimo/core/log CachingLog4jLog.java
Date Thu, 14 Aug 2003 21:54:45 GMT
dain        2003/08/14 14:54:45

  Added:       modules/core/src/java/org/apache/geronimo/core/log
                        CachingLog4jLog.java
  Log:
  Added proof of concept CachingLog4jLog commons logging implementation.
  
  Revision  Changes    Path
  1.1                  incubator-geronimo/modules/core/src/java/org/apache/geronimo/core/log/CachingLog4jLog.java
  
  Index: CachingLog4jLog.java
  ===================================================================
  /* ====================================================================
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 2003 The Apache Software Foundation.  All rights
   * reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. The end-user documentation included with the redistribution,
   *    if any, must include the following acknowledgment:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowledgment may appear in the software itself,
   *    if and wherever such third-party acknowledgments normally appear.
   *
   * 4. The names "Apache" and "Apache Software Foundation" and
   *    "Apache Geronimo" must not be used to endorse or promote products
   *    derived from this software without prior written permission. For
   *    written permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache",
   *    "Apache Geronimo", nor may "Apache" appear in their name, without
   *    prior written permission of the Apache Software Foundation.
   *
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   * ====================================================================
   */
  package org.apache.geronimo.core.log;
  
  import java.lang.ref.WeakReference;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.Set;
  import java.util.Timer;
  import java.util.TimerTask;
  
  import org.apache.log4j.Logger;
  import org.apache.log4j.Priority;
  import org.apache.commons.logging.Log;
  
  /**
   * This log wrapper caches the trace, debug and info enabled flags.  The flags are updated
   * by a single timer task for all logs.  The error, warn and fatal levels are always enabled.
   *
   * @version $Revision: 1.1 $ $Date: 2003/08/14 21:54:45 $
   */
  public final class CachingLog4jLog implements Log {
      // @todo this need to be moved to a log manager MBean, but this works as a proof of
concept
      private static final Set logs = new HashSet();
      private static final Timer timer = new Timer();
      private static final TimerTask task = new TimerTask() {
          public void run() {
              HashSet logSnapshot;
              synchronized (logs) {
                  logSnapshot = new HashSet(logs);
              }
  
              for (Iterator i = logSnapshot.iterator(); i.hasNext();) {
                  WeakReference weakReference = (WeakReference) i.next();
                  CachingLog4jLog log = (CachingLog4jLog) weakReference.get();
                  if (log == null) {
                      synchronized (logs) {
                          logs.remove(log);
                      }
                  } else {
                      log.updateLevelInfo();
                  }
              }
  
          }
      };
  
      static {
          timer.schedule(task, 3 * 60 * 1000, 3 * 60 * 1000);
      }
  
      private static void addLog(CachingLog4jLog log) {
          synchronized (logs) {
              logs.add(new WeakReference(log));
          }
      }
  
      private static final String FQCN = CachingLog4jLog.class.getName();
      private final Logger logger;
      private boolean traceEnabled;
      private boolean debugEnabled;
      private boolean infoEnabled;
  
      public CachingLog4jLog() {
          logger = null;
      }
  
      public CachingLog4jLog(String name) {
          logger = Logger.getLogger(name);
          addLog(this);
      }
  
      public CachingLog4jLog(Logger logger) {
          this.logger = logger;
          addLog(this);
      }
  
      public boolean isTraceEnabled() {
          return traceEnabled;
      }
  
      public void trace(Object message) {
          if (traceEnabled) {
              logger.log(FQCN, XLevel.TRACE, message, null);
          }
      }
  
      public void trace(Object message, Throwable throwable) {
          if (traceEnabled) {
              logger.log(FQCN, XLevel.TRACE, message, throwable);
          }
      }
  
      public boolean isDebugEnabled() {
          return debugEnabled;
      }
  
      public void debug(Object message) {
          if (debugEnabled) {
              logger.log(FQCN, Priority.DEBUG, message, null);
          }
      }
  
      public void debug(Object message, Throwable throwable) {
          if (debugEnabled) {
              logger.log(FQCN, Priority.DEBUG, message, throwable);
          }
      }
  
      public boolean isInfoEnabled() {
          return infoEnabled;
      }
  
      public void info(Object message) {
          if (infoEnabled) {
              logger.log(FQCN, Priority.INFO, message, null);
          }
      }
  
      public void info(Object message, Throwable throwable) {
          if (infoEnabled) {
              logger.log(FQCN, Priority.INFO, message, throwable);
          }
      }
  
      public boolean isWarnEnabled() {
          return true;
      }
  
      public void warn(Object message) {
          logger.log(FQCN, Priority.WARN, message, null);
      }
  
      public void warn(Object message, Throwable throwable) {
          logger.log(FQCN, Priority.WARN, message, throwable);
      }
  
      public boolean isErrorEnabled() {
          return true;
      }
  
      public void error(Object message) {
          logger.log(FQCN, Priority.ERROR, message, null);
      }
  
      public void error(Object message, Throwable throwable) {
          logger.log(FQCN, Priority.ERROR, message, throwable);
      }
  
      public boolean isFatalEnabled() {
          return true;
      }
  
      public void fatal(Object message) {
          logger.log(FQCN, Priority.FATAL, message, null);
      }
  
      public void fatal(Object message, Throwable throwable) {
          logger.log(FQCN, Priority.FATAL, message, throwable);
      }
  
      private void updateLevelInfo() {
          // This method is proposely not synchronized.
          // The setting of a boolean is atomic so we don't have to worry about inconsistent
state.
          // Normally we would have to worry about an out of date cache running threads (SMP
boxes),
          // but this cache is not time critical (so don't worry about it).
          traceEnabled = logger.isEnabledFor(XLevel.TRACE);
          debugEnabled = logger.isDebugEnabled();
          infoEnabled = logger.isInfoEnabled();
      }
  }
  
  
  

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