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<div class="subTitle">org.apache.log4j</div>
<h2 title="Class MDC" class="title">Class MDC</h2>
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<pre>public class <span class="typeNameLabel">MDC</span>
extends java.lang.Object</pre>
<div class="block">The MDC class is similar to the <a href="../../../org/apache/log4j/NDC.html" title="class in org.apache.log4j"><code>NDC</code></a> 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
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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.</div>
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<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2</dd>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Ceki Gülcü</dd>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/MDC.html#clear--">clear</a></span>()</code>
<div class="block">Remove all values from the MDC.</div>
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<td class="colFirst"><code>static java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/MDC.html#get-java.lang.String-">get</a></span>(java.lang.String key)</code>
<div class="block">Get the context identified by the <code>key</code> parameter.</div>
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<td class="colFirst"><code>static java.util.Hashtable</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/MDC.html#getContext--">getContext</a></span>()</code>
<div class="block">Get the current thread's MDC as a hashtable.</div>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/MDC.html#put-java.lang.String-java.lang.Object-">put</a></span>(java.lang.String key,
java.lang.Object o)</code>
<div class="block">Put a context value (the <code>o</code> parameter) as identified
with the <code>key</code> parameter into the current thread's
context map.</div>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/MDC.html#remove-java.lang.String-">remove</a></span>(java.lang.String key)</code>
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<pre>public static void put(java.lang.String key,
java.lang.Object o)</pre>
<div class="block">Put a context value (the <code>o</code> parameter) as identified
with the <code>key</code> parameter into the current thread's
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<pre>public static java.lang.Object get(java.lang.String key)</pre>
<div class="block">Get the context identified by the <code>key</code> parameter.
<p>This method has no side effects.</div>
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<pre>public static void remove(java.lang.String key)</pre>
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<pre>public static java.util.Hashtable getContext()</pre>
<div class="block">Get the current thread's MDC as a hashtable. This method is
intended to be used internally.</div>
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<h4>clear</h4>
<pre>public static void clear()</pre>
<div class="block">Remove all values from the MDC.</div>
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<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2.16</dd>
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<div class="aboutLanguage"><b>Log4j 1.2.17</b><!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the 'License'); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an 'AS IS' BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --></div>
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