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From cos...@apache.org
Subject cvs commit: jakarta-tomcat/src/share/org/apache/tomcat/util/qlog QLogFactory.java
Date Thu, 19 Dec 2002 08:03:32 GMT
costin      2002/12/19 00:03:32

  Added:       src/share/org/apache/tomcat/util/qlog QLogFactory.java
  Log:
  Old code I had in my local dirs. I didn't tested it - but it compiles
  and it should work fine.
  It allows to use qlog implementation for logging. The intention was
  to have it as a smooth transition path for components using
  j-t-c/util Log interface, and eventually to allow qlog to be used
  as a very light logger.
  
  If nobody needs it - please remove it :-)
  
  Revision  Changes    Path
  1.1                  jakarta-tomcat/src/share/org/apache/tomcat/util/qlog/QLogFactory.java
  
  Index: QLogFactory.java
  ===================================================================
  /*
   * ====================================================================
   *
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999-2002 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 acknowlegement:
   *       "This product includes software developed by the
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Commons", and "Apache Software
   *    Foundation" 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"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * 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.tomcat.util.qlog;
  
  
  import java.lang.reflect.Constructor;
  import java.lang.reflect.Method;
  import java.util.Enumeration;
  import java.util.Hashtable;
  import java.util.Vector;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogConfigurationException;
  import org.apache.commons.logging.LogFactory;
  import org.apache.commons.logging.LogSource;
  
  
  import org.apache.tomcat.util.log.*;
      
  /**
   *
   * @author Costin Manolache
   */
  public final class QLogFactory extends LogFactory {
      static LogManager logManager;
      static LogDaemon logDaemon;
      
      public QLogFactory() {
          super();
  
          if( logManager == null ) {
              logManager=new TomcatLogManager();
  
  	    logDaemon=new LogDaemon();
  	    logDaemon.start();
  	}
      }
  
      /**
       * The configuration attributes for this {@link LogFactory}.
       */
      private Hashtable attributes = new Hashtable();
  
      // previously returned instances, to avoid creation of proxies
      private Hashtable instances = new Hashtable();
  
      // --------------------------------------------------------- Public Methods
      /** Adapter and registry for QueueLoggers
       */
      static class TomcatLogManager extends LogManager {
  	TomcatLogManager() {
  	    // can't be changed after this
  	    LogManager olm=org.apache.tomcat.util.log.Log.setLogManager( this ); 
  	    this.loggers=olm.getLoggers();
  	    this.channels=olm.getChannels();
  	}
      }
  
  
      /**
       * Return the configuration attribute with the specified name (if any),
       * or <code>null</code> if there is no such attribute.
       *
       * @param name Name of the attribute to return
       */
      public Object getAttribute(String name) {
          return (attributes.get(name));
      }
  
  
      /**
       * Return an array containing the names of all currently defined
       * configuration attributes.  If there are no such attributes, a zero
       * length array is returned.
       */
      public String[] getAttributeNames() {
          Vector names = new Vector();
          Enumeration keys = attributes.keys();
          while (keys.hasMoreElements()) {
              names.addElement((String) keys.nextElement());
          }
          String results[] = new String[names.size()];
          for (int i = 0; i < results.length; i++) {
              results[i] = (String) names.elementAt(i);
          }
          return (results);
      }
  
  
      /**
       * Convenience method to derive a name from the specified class and
       * call <code>getInstance(String)</code> with it.
       *
       * @param clazz Class for which a suitable Log name will be derived
       *
       * @exception LogConfigurationException if a suitable <code>Log</code>
       *  instance cannot be returned
       */
      public Log getInstance(Class clazz)
          throws LogConfigurationException
      {
          return getInstance( clazz.getName() );
      }
      
  
      public Log getInstance(String name)
          throws LogConfigurationException
      {
          Log instance = (Log) instances.get(name);
          if( instance != null )
              return instance;
  
          instance =org.apache.tomcat.util.log.Log.getLog( name, name );
          instances.put( name, instance );
          return instance;
      }
  
  
      public void release() {
          instances.clear();
      }
  
  
      /**
       * Remove any configuration attribute associated with the specified name.
       * If there is no such attribute, no action is taken.
       *
       * @param name Name of the attribute to remove
       */
      public void removeAttribute(String name) {
          attributes.remove(name);
      }
  
  
      /**
       * Set the configuration attribute with the specified name.  Calling
       * this with a <code>null</code> value is equivalent to calling
       * <code>removeAttribute(name)</code>.
       *
       * @param name Name of the attribute to set
       * @param value Value of the attribute to set, or <code>null</code>
       *  to remove any setting for this attribute
       */
      public void setAttribute(String name, Object value) {
          if (value == null) {
              attributes.remove(name);
          } else {
              attributes.put(name, value);
          }
      }
  
  }
  
  
  

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