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<div class="subTitle">org.apache.shiro.web.mgt</div>
<h2 title="Class DefaultWebSessionStorageEvaluator" class="title">Class DefaultWebSessionStorageEvaluator</h2>
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<li>org.apache.shiro.web.mgt.DefaultWebSessionStorageEvaluator</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html" title="interface in org.apache.shiro.mgt">SessionStorageEvaluator</a></dd>
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<pre>public class <a href="../../../../../src-html/org/apache/shiro/web/mgt/DefaultWebSessionStorageEvaluator.html#line.49">DefaultWebSessionStorageEvaluator</a>
extends <a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt">DefaultSessionStorageEvaluator</a></pre>
<div class="block">A web-specific <code>SessionStorageEvaluator</code> that performs the same logic as the parent class
<a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a> but additionally checks for a request-specific flag that may enable or
disable session access.
<p/>
This implementation usually works in conjunction with the
<a href="../../../../../org/apache/shiro/web/filter/session/NoSessionCreationFilter.html" title="class in org.apache.shiro.web.filter.session"><code>NoSessionCreationFilter</code></a>: If the <code>NoSessionCreationFilter</code>
is configured in a filter chain, that filter will set a specific
<code>ServletRequest</code> <a href="http://java.sun.com/javaee/5/docs/api/javax/servlet/ServletRequest.html?is-external=true#setAttribute(java.lang.String, java.lang.Object)" title="class or interface in javax.servlet"><code>attribute</code></a> indicating that session creation
should be disabled.
<p/>
This <code>DefaultWebSessionStorageEvaluator</code> will then inspect this attribute, and if it has been set, will return
<code>false</code> from <a href="../../../../../org/apache/shiro/web/mgt/DefaultWebSessionStorageEvaluator.html#isSessionStorageEnabled(org.apache.shiro.subject.Subject)"><code>isSessionStorageEnabled(org.apache.shiro.subject.Subject)</code></a> method, thereby preventing
Shiro from creating a session for the purpose of storing subject state.
<p/>
If the request attribute has
not been set (i.e. the <code>NoSessionCreationFilter</code> is not configured or has been disabled), this class does
nothing and delegates to the parent class for existing behavior.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.2</dd></dl>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/shiro/web/mgt/DefaultWebSessionStorageEvaluator.html#DefaultWebSessionStorageEvaluator()">DefaultWebSessionStorageEvaluator</a></strong>()</code>&nbsp;</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/shiro/web/mgt/DefaultWebSessionStorageEvaluator.html#isSessionStorageEnabled(org.apache.shiro.subject.Subject)">isSessionStorageEnabled</a></strong>(<a href="../../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</code>
<div class="block">Returns <code>true</code> if session storage is generally available (as determined by the super class's global
configuration property <a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html#isSessionStorageEnabled()"><code>DefaultSessionStorageEvaluator.isSessionStorageEnabled()</code></a> and no request-specific override has turned off
session storage, <code>false</code> otherwise.</div>
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<h3>Methods inherited from class&nbsp;org.apache.shiro.mgt.<a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt">DefaultSessionStorageEvaluator</a></h3>
<code><a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html#isSessionStorageEnabled()">isSessionStorageEnabled</a>, <a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html#setSessionStorageEnabled(boolean)">setSessionStorageEnabled</a></code></li>
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<h4>DefaultWebSessionStorageEvaluator</h4>
<pre>public&nbsp;<a href="../../../../../src-html/org/apache/shiro/web/mgt/DefaultWebSessionStorageEvaluator.html#line.49">DefaultWebSessionStorageEvaluator</a>()</pre>
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<h4>isSessionStorageEnabled</h4>
<pre>public&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/shiro/web/mgt/DefaultWebSessionStorageEvaluator.html#line.79">isSessionStorageEnabled</a>(<a href="../../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</pre>
<div class="block">Returns <code>true</code> if session storage is generally available (as determined by the super class's global
configuration property <a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html#isSessionStorageEnabled()"><code>DefaultSessionStorageEvaluator.isSessionStorageEnabled()</code></a> and no request-specific override has turned off
session storage, <code>false</code> otherwise.
<p/>
This means session storage is disabled if the <a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html#isSessionStorageEnabled()"><code>DefaultSessionStorageEvaluator.isSessionStorageEnabled()</code></a> property is <code>false</code> or if
a request attribute is discovered that turns off session storage for the current request.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html#isSessionStorageEnabled(org.apache.shiro.subject.Subject)">isSessionStorageEnabled</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html" title="interface in org.apache.shiro.mgt">SessionStorageEvaluator</a></code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html#isSessionStorageEnabled(org.apache.shiro.subject.Subject)">isSessionStorageEnabled</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt">DefaultSessionStorageEvaluator</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>subject</code> - the <code>Subject</code> for which session state persistence may be enabled</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if session storage is generally available (as determined by the super class's global
configuration property <a href="../../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html#isSessionStorageEnabled()"><code>DefaultSessionStorageEvaluator.isSessionStorageEnabled()</code></a> and no request-specific override has turned off
session storage, <code>false</code> otherwise.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../org/apache/shiro/subject/Subject.html#getSession()"><code>Subject.getSession()</code></a>,
<a href="../../../../../org/apache/shiro/subject/Subject.html#getSession(boolean)"><code>Subject.getSession(boolean)</code></a></dd></dl>
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