Added a log4j specific factory. It's cleaner and goes directly
to the logger impl, without introspection. The factory can be extended to take advantage of other log4j features ( it calls getInstance(Class) direclty for example ) to integrate better. git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/logging/trunk@138865 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Costin Manolache
202
src/java/org/apache/commons/logging/impl/Log4jFactory.java
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src/java/org/apache/commons/logging/impl/Log4jFactory.java
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/*
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* ====================================================================
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*
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution, if
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* any, must include the following acknowlegement:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowlegement may appear in the software itself,
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* if and wherever such third-party acknowlegements normally appear.
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*
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* 4. The names "The Jakarta Project", "Commons", and "Apache Software
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* Foundation" must not be used to endorse or promote products derived
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* from this software without prior written permission. For written
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* permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Group.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package org.apache.commons.logging.impl;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Method;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.Vector;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogConfigurationException;
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import org.apache.commons.logging.LogFactory;
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import org.apache.commons.logging.LogSource;
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import org.apache.log4j.Category;
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/**
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* <p>Concrete subclass of {@link LogFactory} specific to log4j.
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*
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* @author Costin Manolache
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*/
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public final class Log4jFactory extends LogFactory {
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public Log4jFactory() {
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super();
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}
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/**
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* The configuration attributes for this {@link LogFactory}.
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*/
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private Hashtable attributes = new Hashtable();
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// previously returned instances, to avoid creation of proxies
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private Hashtable instances = new Hashtable();
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// --------------------------------------------------------- Public Methods
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/**
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* Return the configuration attribute with the specified name (if any),
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* or <code>null</code> if there is no such attribute.
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*
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* @param name Name of the attribute to return
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*/
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public Object getAttribute(String name) {
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return (attributes.get(name));
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}
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/**
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* Return an array containing the names of all currently defined
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* configuration attributes. If there are no such attributes, a zero
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* length array is returned.
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*/
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public String[] getAttributeNames() {
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Vector names = new Vector();
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Enumeration keys = attributes.keys();
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while (keys.hasMoreElements()) {
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names.addElement((String) keys.nextElement());
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}
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String results[] = new String[names.size()];
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for (int i = 0; i < results.length; i++) {
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results[i] = (String) names.elementAt(i);
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}
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return (results);
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}
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/**
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* Convenience method to derive a name from the specified class and
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* call <code>getInstance(String)</code> with it.
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*
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* @param clazz Class for which a suitable Log name will be derived
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*
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* @exception LogConfigurationException if a suitable <code>Log</code>
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* instance cannot be returned
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*/
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public Log getInstance(Class clazz)
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throws LogConfigurationException
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{
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Log instance = (Log) instances.get(clazz);
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if( instance != null )
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return instance;
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instance=new Log4JCategoryLog( Category.getInstance( clazz ));
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instances.put( clazz, instance );
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return instance;
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}
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public Log getInstance(String name)
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throws LogConfigurationException
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{
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Log instance = (Log) instances.get(name);
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if( instance != null )
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return instance;
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instance=new Log4JCategoryLog( Category.getInstance( name ));
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instances.put( name, instance );
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return instance;
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}
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/**
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* Release any internal references to previously created {@link Log}
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* instances returned by this factory. This is useful environments
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* like servlet containers, which implement application reloading by
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* throwing away a ClassLoader. Dangling references to objects in that
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* class loader would prevent garbage collection.
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*/
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public void release() {
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instances.clear();
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// what's the log4j mechanism to cleanup ???
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}
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/**
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* Remove any configuration attribute associated with the specified name.
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* If there is no such attribute, no action is taken.
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*
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* @param name Name of the attribute to remove
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*/
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public void removeAttribute(String name) {
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attributes.remove(name);
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}
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/**
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* Set the configuration attribute with the specified name. Calling
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* this with a <code>null</code> value is equivalent to calling
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* <code>removeAttribute(name)</code>.
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*
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* @param name Name of the attribute to set
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* @param value Value of the attribute to set, or <code>null</code>
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* to remove any setting for this attribute
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*/
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public void setAttribute(String name, Object value) {
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if (value == null) {
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attributes.remove(name);
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} else {
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attributes.put(name, value);
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}
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}
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}
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