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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.logging.log4j.core.impl</a></div>
<h1 title="Class ContextDataInjectorFactory" class="title">Class ContextDataInjectorFactory</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">org.apache.logging.log4j.core.impl.ContextDataInjectorFactory</div>
</div>
<section class="class-description" id="class-description">
<hr>
<div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">ContextDataInjectorFactory</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
<div class="block">Factory for ContextDataInjectors. Returns a new <code>ContextDataInjector</code> instance based on the value of system
property <code>log4j2.ContextDataInjector</code>. Users may use this system property to specify the fully qualified class
name of a class that implements the <code>ContextDataInjector</code> interface.
If no value was specified this factory method returns one of the injectors defined in
<code>ThreadContextDataInjector</code>.</div>
<dl class="notes">
<dt>Since:</dt>
<dd>2.7</dd>
<dt>See Also:</dt>
<dd>
<ul class="see-list">
<li><a href="../ContextDataInjector.html" title="interface in org.apache.logging.log4j.core"><code>ContextDataInjector</code></a></li>
<li><a href="https://logging.apache.org/log4j/2.x/apidocs/org/apache/logging/log4j/util/ReadOnlyStringMap.html" title="class or interface in org.apache.logging.log4j.util" class="external-link"><code>ReadOnlyStringMap</code></a></li>
<li><a href="ThreadContextDataInjector.html" title="class in org.apache.logging.log4j.core.impl"><code>ThreadContextDataInjector</code></a></li>
<li><a href="../LogEvent.html#getContextData()"><code>LogEvent.getContextData()</code></a></li>
</ul>
</dd>
</dl>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
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<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">ContextDataInjectorFactory</a>()</code></div>
<div class="col-last even-row-color">&nbsp;</div>
</div>
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<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="../ContextDataInjector.html" title="interface in org.apache.logging.log4j.core">ContextDataInjector</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#createInjector()" class="member-name-link">createInjector</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Returns a new <code>ContextDataInjector</code> instance based on the value of system property
<code>log4j2.ContextDataInjector</code>.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#equals-java.lang.Object-" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#finalize--" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
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<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
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<h2>Constructor Details</h2>
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<li>
<section class="detail" id="&lt;init&gt;()">
<h3>ContextDataInjectorFactory</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">ContextDataInjectorFactory</span>()</div>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="createInjector()">
<h3>createInjector</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="../ContextDataInjector.html" title="interface in org.apache.logging.log4j.core">ContextDataInjector</a></span>&nbsp;<span class="element-name">createInjector</span>()</div>
<div class="block">Returns a new <code>ContextDataInjector</code> instance based on the value of system property
<code>log4j2.ContextDataInjector</code>. If no value was specified this factory method returns one of the
<code>ContextDataInjector</code> classes defined in <a href="ThreadContextDataInjector.html" title="class in org.apache.logging.log4j.core.impl"><code>ThreadContextDataInjector</code></a> which is most appropriate for
the ThreadContext implementation.
<p>
<b>Note:</b> It is no longer recommended that users provide a custom implementation of the ContextDataInjector.
Instead, provide a <code>ContextDataProvider</code>.
</p>
<p>
Users may use this system property to specify the fully qualified class name of a class that implements the
<code>ContextDataInjector</code> interface.
</p><p>
When providing a custom <code>ContextDataInjector</code>, be aware that this method may be invoked multiple times by
the various components in Log4j that need access to context data.
This includes the object(s) that populate log events, but also various lookups and filters that look at
context data to determine whether an event should be logged.
</p></div>
<dl class="notes">
<dt>Returns:</dt>
<dd>a ContextDataInjector that populates the <code>ReadOnlyStringMap</code> of all <code>LogEvent</code> objects</dd>
<dt>See Also:</dt>
<dd>
<ul class="see-list">
<li><a href="../LogEvent.html#getContextData()"><code>LogEvent.getContextData()</code></a></li>
<li><a href="../ContextDataInjector.html" title="interface in org.apache.logging.log4j.core"><code>ContextDataInjector</code></a></li>
</ul>
</dd>
</dl>
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