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| <h2 title="Class MemorySessionDAO" class="title">Class MemorySessionDAO</h2> |
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| <li> |
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| <li><a href="AbstractSessionDAO.html" title="class in org.apache.shiro.session.mgt.eis">org.apache.shiro.session.mgt.eis.AbstractSessionDAO</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.shiro.session.mgt.eis.MemorySessionDAO</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><code><a href="SessionDAO.html" title="interface in org.apache.shiro.session.mgt.eis">SessionDAO</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public class <a href="../../../../../../src-html/org/apache/shiro/session/mgt/eis/MemorySessionDAO.html#line.56">MemorySessionDAO</a> |
| extends <a href="AbstractSessionDAO.html" title="class in org.apache.shiro.session.mgt.eis">AbstractSessionDAO</a></pre> |
| <div class="block">Simple memory-based implementation of the SessionDAO that stores all of its sessions in an in-memory |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true" title="class or interface in java.util.concurrent" class="externalLink"><code>ConcurrentMap</code></a>. <b>This implementation does not page to disk and is therefore unsuitable for applications |
| that could experience a large amount of sessions</b> and would therefore cause <code>OutOfMemoryException</code>s. It is |
| <em>not</em> recommended for production use in most environments. |
| <h2>Memory Restrictions</h2> |
| If your application is expected to host many sessions beyond what can be stored in the |
| memory available to the JVM, it is highly recommended to use a different <code>SessionDAO</code> implementation which |
| uses a more expansive or permanent backing data store. |
| <p/> |
| In this case, it is recommended to instead use a custom |
| <a href="CachingSessionDAO.html" title="class in org.apache.shiro.session.mgt.eis"><code>CachingSessionDAO</code></a> implementation that communicates with a higher-capacity data store of your choice |
| (file system, database, etc). |
| <h2>Changes in 1.0</h2> |
| This implementation prior to 1.0 used to subclass the <a href="CachingSessionDAO.html" title="class in org.apache.shiro.session.mgt.eis"><code>CachingSessionDAO</code></a>, but this caused problems with many |
| cache implementations that would expunge entries due to TTL settings, resulting in Sessions that would be randomly |
| (and permanently) lost. The Shiro 1.0 release refactored this implementation to be 100% memory-based (without |
| <code>Cache</code> usage to avoid this problem.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>0.1</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="CachingSessionDAO.html" title="class in org.apache.shiro.session.mgt.eis"><code>CachingSessionDAO</code></a></dd> |
| </dl> |
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| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">MemorySessionDAO</a></span>()</code></th> |
| <td class="colLast"> </td> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#delete(org.apache.shiro.session.Session)">delete</a></span>​(<a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> session)</code></th> |
| <td class="colLast"> |
| <div class="block">Deletes the associated EIS record of the specified <code>session</code>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#doCreate(org.apache.shiro.session.Session)">doCreate</a></span>​(<a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> session)</code></th> |
| <td class="colLast"> |
| <div class="block">Subclass hook to actually persist the given <tt>Session</tt> instance to the underlying EIS.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#doReadSession(java.io.Serializable)">doReadSession</a></span>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a> sessionId)</code></th> |
| <td class="colLast"> |
| <div class="block">Subclass implementation hook that retrieves the Session object from the underlying EIS or <code>null</code> if a |
| session with that ID could not be found.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a><<a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getActiveSessions()">getActiveSessions</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns all sessions in the EIS that are considered active, meaning all sessions that |
| haven't been stopped/expired.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>protected <a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#storeSession(java.io.Serializable,org.apache.shiro.session.Session)">storeSession</a></span>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a> id, |
| <a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> session)</code></th> |
| <td class="colLast"> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#update(org.apache.shiro.session.Session)">update</a></span>​(<a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> session)</code></th> |
| <td class="colLast"> |
| <div class="block">Updates (persists) data from a previously created Session instance in the EIS identified by |
| <code>{@link Session#getId() session.getId()}</code>.</div> |
| </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a id="methods.inherited.from.class.org.apache.shiro.session.mgt.eis.AbstractSessionDAO"> |
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| </a> |
| <h3>Methods inherited from class org.apache.shiro.session.mgt.eis.<a href="AbstractSessionDAO.html" title="class in org.apache.shiro.session.mgt.eis">AbstractSessionDAO</a></h3> |
| <code><a href="AbstractSessionDAO.html#assignSessionId(org.apache.shiro.session.Session,java.io.Serializable)">assignSessionId</a>, <a href="AbstractSessionDAO.html#create(org.apache.shiro.session.Session)">create</a>, <a href="AbstractSessionDAO.html#generateSessionId(org.apache.shiro.session.Session)">generateSessionId</a>, <a href="AbstractSessionDAO.html#getSessionIdGenerator()">getSessionIdGenerator</a>, <a href="AbstractSessionDAO.html#readSession(java.io.Serializable)">readSession</a>, <a href="AbstractSessionDAO.html#setSessionIdGenerator(org.apache.shiro.session.mgt.eis.SessionIdGenerator)">setSessionIdGenerator</a></code></li> |
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| <h4>MemorySessionDAO</h4> |
| <pre>public <a href="../../../../../../src-html/org/apache/shiro/session/mgt/eis/MemorySessionDAO.html#line.62">MemorySessionDAO</a>()</pre> |
| </li> |
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| <a id="doCreate(org.apache.shiro.session.Session)"> |
| <!-- --> |
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| <li class="blockList"> |
| <h4>doCreate</h4> |
| <pre class="methodSignature">protected <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a> <a href="../../../../../../src-html/org/apache/shiro/session/mgt/eis/MemorySessionDAO.html#line.66">doCreate</a>​(<a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> session)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="AbstractSessionDAO.html#doCreate(org.apache.shiro.session.Session)">AbstractSessionDAO</a></code></span></div> |
| <div class="block">Subclass hook to actually persist the given <tt>Session</tt> instance to the underlying EIS.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="AbstractSessionDAO.html#doCreate(org.apache.shiro.session.Session)">doCreate</a></code> in class <code><a href="AbstractSessionDAO.html" title="class in org.apache.shiro.session.mgt.eis">AbstractSessionDAO</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>session</code> - the Session instance to persist to the EIS.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the id of the session created in the EIS (i.e. this is almost always a primary key and should be the |
| value returned from <a href="../../Session.html#getId()"><code>Session.getId()</code></a>.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>storeSession</h4> |
| <pre class="methodSignature">protected <a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> <a href="../../../../../../src-html/org/apache/shiro/session/mgt/eis/MemorySessionDAO.html#line.73">storeSession</a>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a> id, |
| <a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> session)</pre> |
| </li> |
| </ul> |
| <a id="doReadSession(java.io.Serializable)"> |
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| <h4>doReadSession</h4> |
| <pre class="methodSignature">protected <a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> <a href="../../../../../../src-html/org/apache/shiro/session/mgt/eis/MemorySessionDAO.html#line.80">doReadSession</a>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io" class="externalLink">Serializable</a> sessionId)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="AbstractSessionDAO.html#doReadSession(java.io.Serializable)">AbstractSessionDAO</a></code></span></div> |
| <div class="block">Subclass implementation hook that retrieves the Session object from the underlying EIS or <code>null</code> if a |
| session with that ID could not be found.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="AbstractSessionDAO.html#doReadSession(java.io.Serializable)">doReadSession</a></code> in class <code><a href="AbstractSessionDAO.html" title="class in org.apache.shiro.session.mgt.eis">AbstractSessionDAO</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>sessionId</code> - the id of the <tt>Session</tt> to retrieve.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the Session in the EIS identified by <tt>sessionId</tt> or <code>null</code> if a |
| session with that ID could not be found.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="update(org.apache.shiro.session.Session)"> |
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| </a> |
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| <li class="blockList"> |
| <h4>update</h4> |
| <pre class="methodSignature">public void <a href="../../../../../../src-html/org/apache/shiro/session/mgt/eis/MemorySessionDAO.html#line.84">update</a>​(<a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> session) |
| throws <a href="../../UnknownSessionException.html" title="class in org.apache.shiro.session">UnknownSessionException</a></pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="SessionDAO.html#update(org.apache.shiro.session.Session)">SessionDAO</a></code></span></div> |
| <div class="block">Updates (persists) data from a previously created Session instance in the EIS identified by |
| <code>{@link Session#getId() session.getId()}</code>. This effectively propagates |
| the data in the argument to the EIS record previously saved. |
| <p/> |
| In addition to UnknownSessionException, implementations are free to throw any other |
| exceptions that might occur due to integrity violation constraints or other EIS related |
| errors.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>session</code> - the Session to update</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../UnknownSessionException.html" title="class in org.apache.shiro.session">UnknownSessionException</a></code> - if no existing EIS session record exists with the |
| identifier of <a href="../../Session.html#getId()"><code>session.getSessionId()</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="delete(org.apache.shiro.session.Session)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>delete</h4> |
| <pre class="methodSignature">public void <a href="../../../../../../src-html/org/apache/shiro/session/mgt/eis/MemorySessionDAO.html#line.88">delete</a>​(<a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a> session)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="SessionDAO.html#delete(org.apache.shiro.session.Session)">SessionDAO</a></code></span></div> |
| <div class="block">Deletes the associated EIS record of the specified <code>session</code>. If there never |
| existed a session EIS record with the identifier of |
| <a href="../../Session.html#getId()"><code>session.getId()</code></a>, then this method does nothing.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>session</code> - the session to delete.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getActiveSessions()"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getActiveSessions</h4> |
| <pre class="methodSignature">public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a><<a href="../../Session.html" title="interface in org.apache.shiro.session">Session</a>> <a href="../../../../../../src-html/org/apache/shiro/session/mgt/eis/MemorySessionDAO.html#line.98">getActiveSessions</a>()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="SessionDAO.html#getActiveSessions()">SessionDAO</a></code></span></div> |
| <div class="block">Returns all sessions in the EIS that are considered active, meaning all sessions that |
| haven't been stopped/expired. This is primarily used to validate potential orphans. |
| <p/> |
| If there are no active sessions in the EIS, this method may return an empty collection or <code>null</code>. |
| <h4>Performance</h4> |
| This method should be as efficient as possible, especially in larger systems where there might be |
| thousands of active sessions. Large scale/high performance |
| implementations will often return a subset of the total active sessions and perform validation a little more |
| frequently, rather than return a massive set and validate infrequently. If efficient and possible, it would |
| make sense to return the oldest unstopped sessions available, ordered by |
| <a href="../../Session.html#getLastAccessTime()"><code>lastAccessTime</code></a>. |
| <h4>Smart Results</h4> |
| <em>Ideally</em> this method would only return active sessions that the EIS was certain should be invalided. |
| Typically that is any session that is not stopped and where its lastAccessTimestamp is older than the session |
| timeout. |
| <p/> |
| For example, if sessions were backed by a relational database or SQL-92 'query-able' enterprise cache, you might |
| return something similar to the results returned by this query (assuming |
| <a href="../SimpleSession.html" title="class in org.apache.shiro.session.mgt"><code>SimpleSession</code></a>s were being stored): |
| <pre> |
| select * from sessions s where s.lastAccessTimestamp < ? and s.stopTimestamp is null |
| </pre> |
| where the <code>?</code> parameter is a date instance equal to 'now' minus the session timeout |
| (e.g. now - 30 minutes).</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a Collection of <code>Session</code>s that are considered active, or an |
| empty collection or <code>null</code> if there are no active sessions.</dd> |
| </dl> |
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