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<div class="subTitle">org.apache.shiro.realm</div>
<h2 title="Class CachingRealm" class="title">Class CachingRealm</h2>
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<li>org.apache.shiro.realm.CachingRealm</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../org/apache/shiro/authc/LogoutAware.html" title="interface in org.apache.shiro.authc">LogoutAware</a>, <a href="../../../../org/apache/shiro/cache/CacheManagerAware.html" title="interface in org.apache.shiro.cache">CacheManagerAware</a>, <a href="../../../../org/apache/shiro/realm/Realm.html" title="interface in org.apache.shiro.realm">Realm</a>, <a href="../../../../org/apache/shiro/util/Nameable.html" title="interface in org.apache.shiro.util">Nameable</a></dd>
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<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/apache/shiro/realm/AuthenticatingRealm.html" title="class in org.apache.shiro.realm">AuthenticatingRealm</a></dd>
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<pre>public abstract class <a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.48">CachingRealm</a>
extends <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>
implements <a href="../../../../org/apache/shiro/realm/Realm.html" title="interface in org.apache.shiro.realm">Realm</a>, <a href="../../../../org/apache/shiro/util/Nameable.html" title="interface in org.apache.shiro.util">Nameable</a>, <a href="../../../../org/apache/shiro/cache/CacheManagerAware.html" title="interface in org.apache.shiro.cache">CacheManagerAware</a>, <a href="../../../../org/apache/shiro/authc/LogoutAware.html" title="interface in org.apache.shiro.authc">LogoutAware</a></pre>
<div class="block">A very basic abstract extension point for the <a href="../../../../org/apache/shiro/realm/Realm.html" title="interface in org.apache.shiro.realm"><code>Realm</code></a> interface that provides caching support for subclasses.
<p/>
It also provides a convenience method,
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#getAvailablePrincipal-org.apache.shiro.subject.PrincipalCollection-"><code>getAvailablePrincipal(org.apache.shiro.subject.PrincipalCollection)</code></a>, which is useful across all
realm subclasses for obtaining a realm-specific principal/identity.
<p/>
All actual Realm method implementations are left to subclasses.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.9</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/shiro/realm/CachingRealm.html#clearCache-org.apache.shiro.subject.PrincipalCollection-"><code>clearCache(org.apache.shiro.subject.PrincipalCollection)</code></a>,
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#onLogout-org.apache.shiro.subject.PrincipalCollection-"><code>onLogout(org.apache.shiro.subject.PrincipalCollection)</code></a>,
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#getAvailablePrincipal-org.apache.shiro.subject.PrincipalCollection-"><code>getAvailablePrincipal(org.apache.shiro.subject.PrincipalCollection)</code></a></dd>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#CachingRealm--">CachingRealm</a></span>()</code>
<div class="block">Default no-argument constructor that defaults
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#isCachingEnabled--"><code>cachingEnabled</code></a> (for general caching) to <code>true</code> and sets a
default <a href="../../../../org/apache/shiro/realm/CachingRealm.html#getName--"><code>name</code></a> based on the class name.</div>
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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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<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#afterCacheManagerSet--">afterCacheManagerSet</a></span>()</code>
<div class="block">Template method that may be implemented by subclasses should they wish to react to a
<a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache"><code>CacheManager</code></a> instance being set on the realm instance via the
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#setCacheManager-org.apache.shiro.cache.CacheManager-"><code>setCacheManager(org.apache.shiro.cache.CacheManager)</code></a> mutator.</div>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#clearCache-org.apache.shiro.subject.PrincipalCollection-">clearCache</a></span>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</code>
<div class="block">Clears out any cached data associated with the specified account identity/identities.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#doClearCache-org.apache.shiro.subject.PrincipalCollection-">doClearCache</a></span>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</code>
<div class="block">This implementation does nothing - it is a template to be overridden by subclasses if necessary.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#getAvailablePrincipal-org.apache.shiro.subject.PrincipalCollection-">getAvailablePrincipal</a></span>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</code>
<div class="block">A utility method for subclasses that returns the first available principal of interest to this particular realm.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache">CacheManager</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#getCacheManager--">getCacheManager</a></span>()</code>
<div class="block">Returns the <tt>CacheManager</tt> used for data caching to reduce EIS round trips, or <tt>null</tt> if
caching is disabled.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#getName--">getName</a></span>()</code>
<div class="block">Returns the (application-unique) name assigned to this <code>Realm</code>.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#isCachingEnabled--">isCachingEnabled</a></span>()</code>
<div class="block">Returns <code>true</code> if caching should be used if a <a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache"><code>CacheManager</code></a> has been
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#setCacheManager-org.apache.shiro.cache.CacheManager-"><code>configured</code></a>, <code>false</code> otherwise.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#onLogout-org.apache.shiro.subject.PrincipalCollection-">onLogout</a></span>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</code>
<div class="block">If caching is enabled, this will clear any cached data associated with the specified account identity.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#setCacheManager-org.apache.shiro.cache.CacheManager-">setCacheManager</a></span>(<a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache">CacheManager</a>&nbsp;cacheManager)</code>
<div class="block">Sets the <tt>CacheManager</tt> to be used for data caching to reduce EIS round trips.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#setCachingEnabled-boolean-">setCachingEnabled</a></span>(boolean&nbsp;cachingEnabled)</code>
<div class="block">Sets whether or not caching should be used if a <a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache"><code>CacheManager</code></a> has been
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#setCacheManager-org.apache.shiro.cache.CacheManager-"><code>configured</code></a>.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/shiro/realm/CachingRealm.html#setName-java.lang.String-">setName</a></span>(<a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</code>
<div class="block">Sets the (preferably application unique) name for this component.</div>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Methods inherited from interface&nbsp;org.apache.shiro.realm.<a href="../../../../org/apache/shiro/realm/Realm.html" title="interface in org.apache.shiro.realm">Realm</a></h3>
<code><a href="../../../../org/apache/shiro/realm/Realm.html#getAuthenticationInfo-org.apache.shiro.authc.AuthenticationToken-">getAuthenticationInfo</a>, <a href="../../../../org/apache/shiro/realm/Realm.html#supports-org.apache.shiro.authc.AuthenticationToken-">supports</a></code></li>
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<h4>CachingRealm</h4>
<pre>public&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.71">CachingRealm</a>()</pre>
<div class="block">Default no-argument constructor that defaults
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#isCachingEnabled--"><code>cachingEnabled</code></a> (for general caching) to <code>true</code> and sets a
default <a href="../../../../org/apache/shiro/realm/CachingRealm.html#getName--"><code>name</code></a> based on the class name.
<p/>
Note that while in general, caching may be enabled by default, subclasses have control over
if specific caching is enabled.</div>
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<a name="getCacheManager--">
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<h4>getCacheManager</h4>
<pre>public&nbsp;<a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache">CacheManager</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.83">getCacheManager</a>()</pre>
<div class="block">Returns the <tt>CacheManager</tt> used for data caching to reduce EIS round trips, or <tt>null</tt> if
caching is disabled.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the <tt>CacheManager</tt> used for data caching to reduce EIS round trips, or <tt>null</tt> if
caching is disabled.</dd>
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</li>
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<a name="setCacheManager-org.apache.shiro.cache.CacheManager-">
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<h4>setCacheManager</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.94">setCacheManager</a>(<a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache">CacheManager</a>&nbsp;cacheManager)</pre>
<div class="block">Sets the <tt>CacheManager</tt> to be used for data caching to reduce EIS round trips.
<p/>
This property is <tt>null</tt> by default, indicating that caching is turned off.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/shiro/cache/CacheManagerAware.html#setCacheManager-org.apache.shiro.cache.CacheManager-">setCacheManager</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/shiro/cache/CacheManagerAware.html" title="interface in org.apache.shiro.cache">CacheManagerAware</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cacheManager</code> - the <tt>CacheManager</tt> to use for data caching, or <tt>null</tt> to disable caching.</dd>
</dl>
</li>
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<a name="isCachingEnabled--">
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<h4>isCachingEnabled</h4>
<pre>public&nbsp;boolean&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.110">isCachingEnabled</a>()</pre>
<div class="block">Returns <code>true</code> if caching should be used if a <a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache"><code>CacheManager</code></a> has been
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#setCacheManager-org.apache.shiro.cache.CacheManager-"><code>configured</code></a>, <code>false</code> otherwise.
<p/>
The default value is <code>true</code> since the large majority of Realms will benefit from caching if a CacheManager
has been configured. However, memory-only realms should set this value to <code>false</code> since they would
manage account data in memory already lookups would already be as efficient as possible.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if caching will be globally enabled if a <a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache"><code>CacheManager</code></a> has been
configured, <code>false</code> otherwise</dd>
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<h4>setCachingEnabled</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.120">setCachingEnabled</a>(boolean&nbsp;cachingEnabled)</pre>
<div class="block">Sets whether or not caching should be used if a <a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache"><code>CacheManager</code></a> has been
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#setCacheManager-org.apache.shiro.cache.CacheManager-"><code>configured</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cachingEnabled</code> - whether or not to globally enable caching for this realm.</dd>
</dl>
</li>
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<a name="getName--">
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<h4>getName</h4>
<pre>public&nbsp;<a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.124">getName</a>()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/shiro/realm/Realm.html#getName--">Realm</a></code></span></div>
<div class="block">Returns the (application-unique) name assigned to this <code>Realm</code>. All realms configured for a single
application must have a unique name.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/shiro/realm/Realm.html#getName--">getName</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/shiro/realm/Realm.html" title="interface in org.apache.shiro.realm">Realm</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the (application-unique) name assigned to this <code>Realm</code>.</dd>
</dl>
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</ul>
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<h4>setName</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.128">setName</a>(<a href="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../org/apache/shiro/util/Nameable.html#setName-java.lang.String-">Nameable</a></code></span></div>
<div class="block">Sets the (preferably application unique) name for this component.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/shiro/util/Nameable.html#setName-java.lang.String-">setName</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/shiro/util/Nameable.html" title="interface in org.apache.shiro.util">Nameable</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>name</code> - the preferably application unique name for this component.</dd>
</dl>
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<h4>afterCacheManagerSet</h4>
<pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.137">afterCacheManagerSet</a>()</pre>
<div class="block">Template method that may be implemented by subclasses should they wish to react to a
<a href="../../../../org/apache/shiro/cache/CacheManager.html" title="interface in org.apache.shiro.cache"><code>CacheManager</code></a> instance being set on the realm instance via the
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#setCacheManager-org.apache.shiro.cache.CacheManager-"><code>setCacheManager(org.apache.shiro.cache.CacheManager)</code></a> mutator.</div>
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<h4>onLogout</h4>
<pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.151">onLogout</a>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</pre>
<div class="block">If caching is enabled, this will clear any cached data associated with the specified account identity.
Subclasses are free to override for additional behavior, but be sure to call <code>super.onLogout</code> first.
<p/>
This default implementation merely calls <a href="../../../../org/apache/shiro/realm/CachingRealm.html#clearCache-org.apache.shiro.subject.PrincipalCollection-"><code>clearCache(org.apache.shiro.subject.PrincipalCollection)</code></a>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/shiro/authc/LogoutAware.html#onLogout-org.apache.shiro.subject.PrincipalCollection-">onLogout</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/shiro/authc/LogoutAware.html" title="interface in org.apache.shiro.authc">LogoutAware</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>principals</code> - the application-specific Subject/user identifier that is logging out.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/apache/shiro/realm/CachingRealm.html#clearCache-org.apache.shiro.subject.PrincipalCollection-"><code>clearCache(org.apache.shiro.subject.PrincipalCollection)</code></a>,
<a href="../../../../org/apache/shiro/realm/CachingRealm.html#getAvailablePrincipal-org.apache.shiro.subject.PrincipalCollection-"><code>getAvailablePrincipal(org.apache.shiro.subject.PrincipalCollection)</code></a></dd>
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<h4>clearCache</h4>
<pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.168">clearCache</a>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</pre>
<div class="block">Clears out any cached data associated with the specified account identity/identities.
<p/>
This implementation will return quietly if the principals argument is null or empty. Otherwise it delegates
to <a href="../../../../org/apache/shiro/realm/CachingRealm.html#doClearCache-org.apache.shiro.subject.PrincipalCollection-"><code>doClearCache(org.apache.shiro.subject.PrincipalCollection)</code></a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>principals</code> - the principals of the account for which to clear any cached data.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2</dd>
</dl>
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<a name="doClearCache-org.apache.shiro.subject.PrincipalCollection-">
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<h4>doClearCache</h4>
<pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.181">doClearCache</a>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</pre>
<div class="block">This implementation does nothing - it is a template to be overridden by subclasses if necessary.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>principals</code> - principals the principals of the account for which to clear any cached data.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2</dd>
</dl>
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<h4>getAvailablePrincipal</h4>
<pre>protected&nbsp;<a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/realm/CachingRealm.html#line.202">getAvailablePrincipal</a>(<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html" title="interface in org.apache.shiro.subject">PrincipalCollection</a>&nbsp;principals)</pre>
<div class="block">A utility method for subclasses that returns the first available principal of interest to this particular realm.
The heuristic used to acquire the principal is as follows:
<ul>
<li>Attempt to get <em>this particular Realm's</em> 'primary' principal in the <code>PrincipalCollection</code> via a
<code>principals.<a href="../../../../org/apache/shiro/subject/PrincipalCollection.html#fromRealm-java.lang.String-"><code>fromRealm</code></a>(<a href="../../../../org/apache/shiro/realm/CachingRealm.html#getName--"><code>getName()</code></a>)</code>
call.</li>
<li>If the previous call does not result in any principals, attempt to get the overall 'primary' principal
from the PrincipalCollection via <a href="../../../../org/apache/shiro/subject/PrincipalCollection.html#getPrimaryPrincipal--"><code>PrincipalCollection.getPrimaryPrincipal()</code></a>.</li>
<li>If there are no principals from that call (or the PrincipalCollection argument was null to begin with),
return <code>null</code></li>
</ul></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>principals</code> - the PrincipalCollection holding all principals (from all realms) associated with a single Subject.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the 'primary' principal attributed to this particular realm, or the fallback 'master' principal if it
exists, or if not <code>null</code>.</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.2</dd>
</dl>
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