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| <h2 title="Interface SessionStorageEvaluator" class="title">Interface SessionStorageEvaluator</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt">DefaultSessionStorageEvaluator</a></code>, <code><a href="../web/mgt/DefaultWebSessionStorageEvaluator.html" title="class in org.apache.shiro.web.mgt">DefaultWebSessionStorageEvaluator</a></code></dd> |
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| <pre>public interface <a href="../../../../src-html/org/apache/shiro/mgt/SessionStorageEvaluator.html#line.48">SessionStorageEvaluator</a></pre> |
| <div class="block">Evaluates whether or not Shiro may use a <code>Subject</code>'s <a href="../session/Session.html" title="interface in org.apache.shiro.session"><code>Session</code></a> |
| to persist that <code>Subject</code>'s internal state. |
| <p/> |
| It is a common Shiro implementation strategy to use a Subject's session to persist the Subject's identity and |
| authentication state (e.g. after login) so that information does not need to be passed around for any further |
| requests/invocations. This effectively allows a session id to be used for any request or invocation as the only |
| 'pointer' that Shiro needs, and from that, Shiro can re-create the Subject instance based on the referenced Session. |
| <p/> |
| However, in purely stateless applications, such as some REST applications or those where every request is |
| authenticated, it is usually not needed or desirable to use Sessions to store this state (since it is in |
| fact re-created on every request). In these applications, sessions would never be used. |
| <p/> |
| This interface allows implementations to determine exactly when a Session might be used or not to store |
| <code>Subject</code> state on a <em>per-Subject</em> basis. |
| <p/> |
| If you simply wish to enable or disable session usage at a global level for all <code>Subject</code>s, the |
| <a href="DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a> should be sufficient. Per-subject behavior should be performed in custom |
| implementations of this interface.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.2</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../subject/Subject.html#getSession()"><code>Subject.getSession()</code></a>, |
| <a href="../subject/Subject.html#getSession(boolean)"><code>Subject.getSession(boolean)</code></a>, |
| <a href="DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a></dd> |
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| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isSessionStorageEnabled(org.apache.shiro.subject.Subject)">isSessionStorageEnabled</a></span>​(<a href="../subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a> subject)</code></th> |
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| <div class="block">Returns <code>true</code> if the specified <code>Subject</code>'s |
| <a href="../subject/Subject.html#getSession()"><code>session</code></a> may be used to persist that Subject's |
| state, <code>false</code> otherwise.</div> |
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| <h4>isSessionStorageEnabled</h4> |
| <pre class="methodSignature">boolean <a href="../../../../src-html/org/apache/shiro/mgt/SessionStorageEvaluator.html#line.62">isSessionStorageEnabled</a>​(<a href="../subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a> subject)</pre> |
| <div class="block">Returns <code>true</code> if the specified <code>Subject</code>'s |
| <a href="../subject/Subject.html#getSession()"><code>session</code></a> may be used to persist that Subject's |
| state, <code>false</code> otherwise.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>subject</code> - the <code>Subject</code> for which session state persistence may be enabled</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> if the specified <code>Subject</code>'s |
| <a href="../subject/Subject.html#getSession()"><code>session</code></a> may be used to persist that Subject's |
| state, <code>false</code> otherwise.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../subject/Subject.html#getSession()"><code>Subject.getSession()</code></a>, |
| <a href="../subject/Subject.html#getSession(boolean)"><code>Subject.getSession(boolean)</code></a></dd> |
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