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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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<div class="subTitle">org.apache.log4j</div>
<h2 title="Class NDC" class="title">Class NDC</h2>
</div>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.apache.log4j.NDC</li>
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<pre>public class <span class="typeNameLabel">NDC</span>
extends java.lang.Object</pre>
<div class="block">The NDC class implements <i>nested diagnostic contexts</i> as
defined by Neil Harrison in the article "Patterns for Logging
Diagnostic Messages" part of the book "<i>Pattern Languages of
Program Design 3</i>" edited by Martin et al.
<p>A Nested Diagnostic Context, or NDC in short, is an instrument
to distinguish interleaved log output from different sources. Log
output is typically interleaved when a server handles multiple
clients near-simultaneously.
<p>Interleaved log output can still be meaningful if each log entry
from different contexts had a distinctive stamp. This is where NDCs
come into play.
<p><em><b>Note that NDCs are managed on a per thread
basis</b></em>. NDC operations such as <a href="../../../org/apache/log4j/NDC.html#push-java.lang.String-"><code>push</code></a>, <a href="../../../org/apache/log4j/NDC.html#pop--"><code>pop()</code></a>, <a href="../../../org/apache/log4j/NDC.html#clear--"><code>clear()</code></a>, <a href="../../../org/apache/log4j/NDC.html#getDepth--"><code>getDepth()</code></a> and <a href="../../../org/apache/log4j/NDC.html#setMaxDepth-int-"><code>setMaxDepth(int)</code></a>
affect the NDC of the <em>current</em> thread only. NDCs of other
threads remain unaffected.
<p>For example, a servlet can build a per client request NDC
consisting the clients host name and other information contained in
the the request. <em>Cookies</em> are another source of distinctive
information. To build an NDC one uses the <a href="../../../org/apache/log4j/NDC.html#push-java.lang.String-"><code>push</code></a>
operation. Simply put,
<p><ul>
<li>Contexts can be nested.
<p><li>When entering a context, call <code>NDC.push</code>. As a
side effect, if there is no nested diagnostic context for the
current thread, this method will create it.
<p><li>When leaving a context, call <code>NDC.pop</code>.
<p><li><b>When exiting a thread make sure to call <a href="../../../org/apache/log4j/NDC.html#remove--"><code>NDC.remove()</code></a></b>.
</ul>
<p>There is no penalty for forgetting to match each
<code>push</code> operation with a corresponding <code>pop</code>,
except the obvious mismatch between the real application context
and the context set in the NDC.
<p>If configured to do so, <a href="../../../org/apache/log4j/PatternLayout.html" title="class in org.apache.log4j"><code>PatternLayout</code></a> and <a href="../../../org/apache/log4j/TTCCLayout.html" title="class in org.apache.log4j"><code>TTCCLayout</code></a> instances automatically retrieve the nested diagnostic
context for the current thread without any user intervention.
Hence, even if a servlet is serving multiple clients
simultaneously, the logs emanating from the same code (belonging to
the same category) can still be distinguished because each client
request will have a different NDC tag.
<p>Heavy duty systems should call the <a href="../../../org/apache/log4j/NDC.html#remove--"><code>remove()</code></a> method when
leaving the run method of a thread. This ensures that the memory
used by the thread can be freed by the Java garbage
collector. There is a mechanism to lazily remove references to dead
threads. In practice, this means that you can be a little sloppy
and sometimes forget to call <a href="../../../org/apache/log4j/NDC.html#remove--"><code>remove()</code></a> before exiting a
thread.
<p>A thread may inherit the nested diagnostic context of another
(possibly parent) thread using the <a href="../../../org/apache/log4j/NDC.html#inherit-java.util.Stack-"><code>inherit</code></a>
method. A thread may obtain a copy of its NDC with the <a href="../../../org/apache/log4j/NDC.html#cloneStack--"><code>cloneStack</code></a> method and pass the reference to any other
thread, in particular to a child.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.7.0</dd>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Ceki Gülcü</dd>
</dl>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#clear--">clear</a></span>()</code>
<div class="block">Clear any nested diagnostic information if any.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static java.util.Stack</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#cloneStack--">cloneStack</a></span>()</code>
<div class="block">Clone the diagnostic context for the current thread.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#get--">get</a></span>()</code>
<div class="block"><font color="#FF4040"><b>Never use this method directly, use the <a href="../../../org/apache/log4j/spi/LoggingEvent.html#getNDC--"><code>LoggingEvent.getNDC()</code></a> method instead</b></font>.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#getDepth--">getDepth</a></span>()</code>
<div class="block">Get the current nesting depth of this diagnostic context.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#inherit-java.util.Stack-">inherit</a></span>(java.util.Stack stack)</code>
<div class="block">Inherit the diagnostic context of another thread.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#peek--">peek</a></span>()</code>
<div class="block">Looks at the last diagnostic context at the top of this NDC
without removing it.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#pop--">pop</a></span>()</code>
<div class="block">Clients should call this method before leaving a diagnostic
context.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#push-java.lang.String-">push</a></span>(java.lang.String message)</code>
<div class="block">Push new diagnostic context information for the current thread.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#remove--">remove</a></span>()</code>
<div class="block">Remove the diagnostic context for this thread.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/log4j/NDC.html#setMaxDepth-int-">setMaxDepth</a></span>(int maxDepth)</code>
<div class="block">Set maximum depth of this diagnostic context.</div>
</td>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>clear</h4>
<pre>public static void clear()</pre>
<div class="block">Clear any nested diagnostic information if any. This method is
useful in cases where the same thread can be potentially used
over and over in different unrelated contexts.
<p>This method is equivalent to calling the <a href="../../../org/apache/log4j/NDC.html#setMaxDepth-int-"><code>setMaxDepth(int)</code></a>
method with a zero <code>maxDepth</code> argument.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.8.4c</dd>
</dl>
</li>
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<h4>cloneStack</h4>
<pre>public static java.util.Stack cloneStack()</pre>
<div class="block">Clone the diagnostic context for the current thread.
<p>Internally a diagnostic context is represented as a stack. A
given thread can supply the stack (i.e. diagnostic context) to a
child thread so that the child can inherit the parent thread's
diagnostic context.
<p>The child thread uses the <a href="../../../org/apache/log4j/NDC.html#inherit-java.util.Stack-"><code>inherit</code></a> method to
inherit the parent's diagnostic context.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Stack A clone of the current thread's diagnostic context.</dd>
</dl>
</li>
</ul>
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<h4>inherit</h4>
<pre>public static void inherit(java.util.Stack stack)</pre>
<div class="block">Inherit the diagnostic context of another thread.
<p>The parent thread can obtain a reference to its diagnostic
context using the <a href="../../../org/apache/log4j/NDC.html#cloneStack--"><code>cloneStack()</code></a> method. It should
communicate this information to its child so that it may inherit
the parent's diagnostic context.
<p>The parent's diagnostic context is cloned before being
inherited. In other words, once inherited, the two diagnostic
contexts can be managed independently.
<p>In java, a child thread cannot obtain a reference to its
parent, unless it is directly handed the reference. Consequently,
there is no client-transparent way of inheriting diagnostic
contexts. Do you know any solution to this problem?</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>stack</code> - The diagnostic context of the parent thread.</dd>
</dl>
</li>
</ul>
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<h4>get</h4>
<pre>public static java.lang.String get()</pre>
<div class="block"><font color="#FF4040"><b>Never use this method directly, use the <a href="../../../org/apache/log4j/spi/LoggingEvent.html#getNDC--"><code>LoggingEvent.getNDC()</code></a> method instead</b></font>.</div>
</li>
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<h4>getDepth</h4>
<pre>public static int getDepth()</pre>
<div class="block">Get the current nesting depth of this diagnostic context.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.7.5</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../org/apache/log4j/NDC.html#setMaxDepth-int-"><code>setMaxDepth(int)</code></a></dd>
</dl>
</li>
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<h4>pop</h4>
<pre>public static java.lang.String pop()</pre>
<div class="block">Clients should call this method before leaving a diagnostic
context.
<p>The returned value is the value that was pushed last. If no
context is available, then the empty string "" is returned.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>String The innermost diagnostic context.</dd>
</dl>
</li>
</ul>
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<h4>peek</h4>
<pre>public static java.lang.String peek()</pre>
<div class="block">Looks at the last diagnostic context at the top of this NDC
without removing it.
<p>The returned value is the value that was pushed last. If no
context is available, then the empty string "" is returned.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>String The innermost diagnostic context.</dd>
</dl>
</li>
</ul>
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<h4>push</h4>
<pre>public static void push(java.lang.String message)</pre>
<div class="block">Push new diagnostic context information for the current thread.
<p>The contents of the <code>message</code> parameter is
determined solely by the client.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>message</code> - The new diagnostic context information.</dd>
</dl>
</li>
</ul>
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<h4>remove</h4>
<pre>public static void remove()</pre>
<div class="block">Remove the diagnostic context for this thread.
<p>Each thread that created a diagnostic context by calling
<a href="../../../org/apache/log4j/NDC.html#push-java.lang.String-"><code>push(java.lang.String)</code></a> should call this method before exiting. Otherwise,
the memory used by the <b>thread</b> cannot be reclaimed by the
VM.
<p>As this is such an important problem in heavy duty systems and
because it is difficult to always guarantee that the remove
method is called before exiting a thread, this method has been
augmented to lazily remove references to dead threads. In
practice, this means that you can be a little sloppy and
occasionally forget to call <a href="../../../org/apache/log4j/NDC.html#remove--"><code>remove()</code></a> before exiting a
thread. However, you must call <code>remove</code> sometime. If
you never call it, then your application is sure to run out of
memory.</div>
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<h4>setMaxDepth</h4>
<pre>public static void setMaxDepth(int maxDepth)</pre>
<div class="block">Set maximum depth of this diagnostic context. If the current
depth is smaller or equal to <code>maxDepth</code>, then no
action is taken.
<p>This method is a convenient alternative to multiple <a href="../../../org/apache/log4j/NDC.html#pop--"><code>pop()</code></a> calls. Moreover, it is often the case that at the end of
complex call sequences, the depth of the NDC is
unpredictable. The <code>setMaxDepth</code> method circumvents
this problem.
<p>For example, the combination
<pre>
void foo() {
int depth = NDC.getDepth();
... complex sequence of calls
NDC.setMaxDepth(depth);
}
</pre>
ensures that between the entry and exit of foo the depth of the
diagnostic stack is conserved.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.7.5</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../org/apache/log4j/NDC.html#getDepth--"><code>getDepth()</code></a></dd>
</dl>
</li>
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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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