The version of Apache log4j used by SoundHelix.
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MDC.java
/*
* ============================================================================
* The Apache Software License, Version 1.1
* ============================================================================
*
* Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, 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 "log4j" 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 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 (INCLU-
* DING, 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.log4j;
import org.apache.log4j.helpers.ThreadLocalMap;
import java.util.Hashtable;
/**
The MDC class is similar to the {@link NDC} class except that it is
based on a map instead of a stack. It provides <em>mapped
diagnostic contexts</em>. A <em>Mapped Diagnostic Context</em>, or
MDC in short, is an instrument for distinguishing interleaved log
output from different sources. Log output is typically interleaved
when a server handles multiple clients near-simultaneously.
<p><b><em>The MDC is managed on a per thread basis</em></b>. A
child thread automatically inherits a <em>copy</em> of the mapped
diagnostic context of its parent.
<p>The MDC class requires JDK 1.2 or above. Under JDK 1.1 the MDC
will always return empty values but otherwise will not affect or
harm your application.
@since 1.2
@author Ceki Gülcü */
public class MDC {
static final int HT_SIZE = 7;
private static final ThreadLocalMap tlm = new ThreadLocalMap();
private MDC() {
}
/**
* Put a context value (the <code>o</code> parameter) as identified
* with the <code>key</code> parameter into the current thread's
* context map.
*
* <p>If the current thread does not have a context map it is
* created as a side effect.
* */
public static void put(String key, Object o) {
Hashtable ht = (Hashtable) tlm.get();
if (ht == null) {
ht = new Hashtable(HT_SIZE);
tlm.set(ht);
}
ht.put(key, o);
}
/**
* Get the context identified by the <code>key</code> parameter.
*
* <p>This method has no side effects.
* */
public static Object get(String key) {
Hashtable ht = (Hashtable) tlm.get();
if ((ht != null) && (key != null)) {
return ht.get(key);
} else {
return null;
}
}
/**
* Remove the the context identified by the <code>key</code>
* parameter. */
public static void remove(String key) {
Hashtable ht = (Hashtable) tlm.get();
if (ht != null) {
ht.remove(key);
}
}
/**
* Clear all entries in the MDC.
* @since 1.3
*/
public static void clear() {
Hashtable ht = (Hashtable) tlm.get();
if (ht != null) {
ht.clear();
}
}
/**
* Get the current thread's MDC as a hashtable. This method is
* intended to be used internally.
* */
public static Hashtable getContext() {
return (Hashtable) tlm.get();
}
}