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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * software distributed under the License is distributed on an<a name="line.13"></a>
<span class="sourceLineNo">014</span> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a>
<span class="sourceLineNo">015</span> * KIND, either express or implied. See the License for the<a name="line.15"></a>
<span class="sourceLineNo">016</span> * specific language governing permissions and limitations<a name="line.16"></a>
<span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a>
<span class="sourceLineNo">018</span> */<a name="line.18"></a>
<span class="sourceLineNo">019</span>package org.apache.shiro.session.mgt;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.apache.shiro.authz.AuthorizationException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.apache.shiro.session.*;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.shiro.util.CollectionUtils;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.slf4j.Logger;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.slf4j.LoggerFactory;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.ArrayList;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Collection;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.Collections;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.Date;<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>/**<a name="line.32"></a>
<span class="sourceLineNo">033</span> * Abstract implementation supporting the {@link NativeSessionManager NativeSessionManager} interface, supporting<a name="line.33"></a>
<span class="sourceLineNo">034</span> * {@link SessionListener SessionListener}s and application of the<a name="line.34"></a>
<span class="sourceLineNo">035</span> * {@link #getGlobalSessionTimeout() globalSessionTimeout}.<a name="line.35"></a>
<span class="sourceLineNo">036</span> *<a name="line.36"></a>
<span class="sourceLineNo">037</span> * @since 1.0<a name="line.37"></a>
<span class="sourceLineNo">038</span> */<a name="line.38"></a>
<span class="sourceLineNo">039</span>public abstract class AbstractNativeSessionManager extends AbstractSessionManager implements NativeSessionManager {<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span> private static final Logger log = LoggerFactory.getLogger(AbstractSessionManager.class);<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span> private Collection&lt;SessionListener&gt; listeners;<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span> public AbstractNativeSessionManager() {<a name="line.45"></a>
<span class="sourceLineNo">046</span> this.listeners = new ArrayList&lt;SessionListener&gt;();<a name="line.46"></a>
<span class="sourceLineNo">047</span> }<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span> public void setSessionListeners(Collection&lt;SessionListener&gt; listeners) {<a name="line.49"></a>
<span class="sourceLineNo">050</span> this.listeners = listeners != null ? listeners : new ArrayList&lt;SessionListener&gt;();<a name="line.50"></a>
<span class="sourceLineNo">051</span> }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span> @SuppressWarnings({"UnusedDeclaration"})<a name="line.53"></a>
<span class="sourceLineNo">054</span> public Collection&lt;SessionListener&gt; getSessionListeners() {<a name="line.54"></a>
<span class="sourceLineNo">055</span> return this.listeners;<a name="line.55"></a>
<span class="sourceLineNo">056</span> }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span> public Session start(SessionContext context) {<a name="line.58"></a>
<span class="sourceLineNo">059</span> Session session = createSession(context);<a name="line.59"></a>
<span class="sourceLineNo">060</span> applyGlobalSessionTimeout(session);<a name="line.60"></a>
<span class="sourceLineNo">061</span> onStart(session, context);<a name="line.61"></a>
<span class="sourceLineNo">062</span> notifyStart(session);<a name="line.62"></a>
<span class="sourceLineNo">063</span> //Don't expose the EIS-tier Session object to the client-tier:<a name="line.63"></a>
<span class="sourceLineNo">064</span> return createExposedSession(session, context);<a name="line.64"></a>
<span class="sourceLineNo">065</span> }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span> /**<a name="line.67"></a>
<span class="sourceLineNo">068</span> * Creates a new {@code Session Session} instance based on the specified (possibly {@code null})<a name="line.68"></a>
<span class="sourceLineNo">069</span> * initialization data. Implementing classes must manage the persistent state of the returned session such that it<a name="line.69"></a>
<span class="sourceLineNo">070</span> * could later be acquired via the {@link #getSession(SessionKey)} method.<a name="line.70"></a>
<span class="sourceLineNo">071</span> *<a name="line.71"></a>
<span class="sourceLineNo">072</span> * @param context the initialization data that can be used by the implementation or underlying<a name="line.72"></a>
<span class="sourceLineNo">073</span> * {@link SessionFactory} when instantiating the internal {@code Session} instance.<a name="line.73"></a>
<span class="sourceLineNo">074</span> * @return the new {@code Session} instance.<a name="line.74"></a>
<span class="sourceLineNo">075</span> * @throws org.apache.shiro.authz.HostUnauthorizedException<a name="line.75"></a>
<span class="sourceLineNo">076</span> * if the system access control policy restricts access based<a name="line.76"></a>
<span class="sourceLineNo">077</span> * on client location/IP and the specified hostAddress hasn't been enabled.<a name="line.77"></a>
<span class="sourceLineNo">078</span> * @throws AuthorizationException if the system access control policy does not allow the currently executing<a name="line.78"></a>
<span class="sourceLineNo">079</span> * caller to start sessions.<a name="line.79"></a>
<span class="sourceLineNo">080</span> */<a name="line.80"></a>
<span class="sourceLineNo">081</span> protected abstract Session createSession(SessionContext context) throws AuthorizationException;<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span> protected void applyGlobalSessionTimeout(Session session) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> session.setTimeout(getGlobalSessionTimeout());<a name="line.84"></a>
<span class="sourceLineNo">085</span> onChange(session);<a name="line.85"></a>
<span class="sourceLineNo">086</span> }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span> /**<a name="line.88"></a>
<span class="sourceLineNo">089</span> * Template method that allows subclasses to react to a new session being created.<a name="line.89"></a>
<span class="sourceLineNo">090</span> * &lt;p/&gt;<a name="line.90"></a>
<span class="sourceLineNo">091</span> * This method is invoked &lt;em&gt;before&lt;/em&gt; any session listeners are notified.<a name="line.91"></a>
<span class="sourceLineNo">092</span> *<a name="line.92"></a>
<span class="sourceLineNo">093</span> * @param session the session that was just {@link #createSession created}.<a name="line.93"></a>
<span class="sourceLineNo">094</span> * @param context the {@link SessionContext SessionContext} that was used to start the session.<a name="line.94"></a>
<span class="sourceLineNo">095</span> */<a name="line.95"></a>
<span class="sourceLineNo">096</span> protected void onStart(Session session, SessionContext context) {<a name="line.96"></a>
<span class="sourceLineNo">097</span> }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span> public Session getSession(SessionKey key) throws SessionException {<a name="line.99"></a>
<span class="sourceLineNo">100</span> Session session = lookupSession(key);<a name="line.100"></a>
<span class="sourceLineNo">101</span> return session != null ? createExposedSession(session, key) : null;<a name="line.101"></a>
<span class="sourceLineNo">102</span> }<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span> private Session lookupSession(SessionKey key) throws SessionException {<a name="line.104"></a>
<span class="sourceLineNo">105</span> if (key == null) {<a name="line.105"></a>
<span class="sourceLineNo">106</span> throw new NullPointerException("SessionKey argument cannot be null.");<a name="line.106"></a>
<span class="sourceLineNo">107</span> }<a name="line.107"></a>
<span class="sourceLineNo">108</span> return doGetSession(key);<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span> private Session lookupRequiredSession(SessionKey key) throws SessionException {<a name="line.111"></a>
<span class="sourceLineNo">112</span> Session session = lookupSession(key);<a name="line.112"></a>
<span class="sourceLineNo">113</span> if (session == null) {<a name="line.113"></a>
<span class="sourceLineNo">114</span> String msg = "Unable to locate required Session instance based on SessionKey [" + key + "].";<a name="line.114"></a>
<span class="sourceLineNo">115</span> throw new UnknownSessionException(msg);<a name="line.115"></a>
<span class="sourceLineNo">116</span> }<a name="line.116"></a>
<span class="sourceLineNo">117</span> return session;<a name="line.117"></a>
<span class="sourceLineNo">118</span> }<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span> protected abstract Session doGetSession(SessionKey key) throws InvalidSessionException;<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span> protected Session createExposedSession(Session session, SessionContext context) {<a name="line.122"></a>
<span class="sourceLineNo">123</span> return new DelegatingSession(this, new DefaultSessionKey(session.getId()));<a name="line.123"></a>
<span class="sourceLineNo">124</span> }<a name="line.124"></a>
<span class="sourceLineNo">125</span><a name="line.125"></a>
<span class="sourceLineNo">126</span> protected Session createExposedSession(Session session, SessionKey key) {<a name="line.126"></a>
<span class="sourceLineNo">127</span> return new DelegatingSession(this, new DefaultSessionKey(session.getId()));<a name="line.127"></a>
<span class="sourceLineNo">128</span> }<a name="line.128"></a>
<span class="sourceLineNo">129</span><a name="line.129"></a>
<span class="sourceLineNo">130</span> /**<a name="line.130"></a>
<span class="sourceLineNo">131</span> * Returns the session instance to use to pass to registered {@code SessionListener}s for notification<a name="line.131"></a>
<span class="sourceLineNo">132</span> * that the session has been invalidated (stopped or expired).<a name="line.132"></a>
<span class="sourceLineNo">133</span> * &lt;p/&gt;<a name="line.133"></a>
<span class="sourceLineNo">134</span> * The default implementation returns an {@link ImmutableProxiedSession ImmutableProxiedSession} instance to ensure<a name="line.134"></a>
<span class="sourceLineNo">135</span> * that the specified {@code session} argument is not modified by any listeners.<a name="line.135"></a>
<span class="sourceLineNo">136</span> *<a name="line.136"></a>
<span class="sourceLineNo">137</span> * @param session the {@code Session} object being invalidated.<a name="line.137"></a>
<span class="sourceLineNo">138</span> * @return the {@code Session} instance to use to pass to registered {@code SessionListener}s for notification.<a name="line.138"></a>
<span class="sourceLineNo">139</span> */<a name="line.139"></a>
<span class="sourceLineNo">140</span> protected Session beforeInvalidNotification(Session session) {<a name="line.140"></a>
<span class="sourceLineNo">141</span> return new ImmutableProxiedSession(session);<a name="line.141"></a>
<span class="sourceLineNo">142</span> }<a name="line.142"></a>
<span class="sourceLineNo">143</span><a name="line.143"></a>
<span class="sourceLineNo">144</span> /**<a name="line.144"></a>
<span class="sourceLineNo">145</span> * Notifies any interested {@link SessionListener}s that a Session has started. This method is invoked<a name="line.145"></a>
<span class="sourceLineNo">146</span> * &lt;em&gt;after&lt;/em&gt; the {@link #onStart onStart} method is called.<a name="line.146"></a>
<span class="sourceLineNo">147</span> *<a name="line.147"></a>
<span class="sourceLineNo">148</span> * @param session the session that has just started that will be delivered to any<a name="line.148"></a>
<span class="sourceLineNo">149</span> * {@link #setSessionListeners(java.util.Collection) registered} session listeners.<a name="line.149"></a>
<span class="sourceLineNo">150</span> * @see SessionListener#onStart(org.apache.shiro.session.Session)<a name="line.150"></a>
<span class="sourceLineNo">151</span> */<a name="line.151"></a>
<span class="sourceLineNo">152</span> protected void notifyStart(Session session) {<a name="line.152"></a>
<span class="sourceLineNo">153</span> for (SessionListener listener : this.listeners) {<a name="line.153"></a>
<span class="sourceLineNo">154</span> listener.onStart(session);<a name="line.154"></a>
<span class="sourceLineNo">155</span> }<a name="line.155"></a>
<span class="sourceLineNo">156</span> }<a name="line.156"></a>
<span class="sourceLineNo">157</span><a name="line.157"></a>
<span class="sourceLineNo">158</span> protected void notifyStop(Session session) {<a name="line.158"></a>
<span class="sourceLineNo">159</span> Session forNotification = beforeInvalidNotification(session);<a name="line.159"></a>
<span class="sourceLineNo">160</span> for (SessionListener listener : this.listeners) {<a name="line.160"></a>
<span class="sourceLineNo">161</span> listener.onStop(forNotification);<a name="line.161"></a>
<span class="sourceLineNo">162</span> }<a name="line.162"></a>
<span class="sourceLineNo">163</span> }<a name="line.163"></a>
<span class="sourceLineNo">164</span><a name="line.164"></a>
<span class="sourceLineNo">165</span> protected void notifyExpiration(Session session) {<a name="line.165"></a>
<span class="sourceLineNo">166</span> Session forNotification = beforeInvalidNotification(session);<a name="line.166"></a>
<span class="sourceLineNo">167</span> for (SessionListener listener : this.listeners) {<a name="line.167"></a>
<span class="sourceLineNo">168</span> listener.onExpiration(forNotification);<a name="line.168"></a>
<span class="sourceLineNo">169</span> }<a name="line.169"></a>
<span class="sourceLineNo">170</span> }<a name="line.170"></a>
<span class="sourceLineNo">171</span><a name="line.171"></a>
<span class="sourceLineNo">172</span> public Date getStartTimestamp(SessionKey key) {<a name="line.172"></a>
<span class="sourceLineNo">173</span> return lookupRequiredSession(key).getStartTimestamp();<a name="line.173"></a>
<span class="sourceLineNo">174</span> }<a name="line.174"></a>
<span class="sourceLineNo">175</span><a name="line.175"></a>
<span class="sourceLineNo">176</span> public Date getLastAccessTime(SessionKey key) {<a name="line.176"></a>
<span class="sourceLineNo">177</span> return lookupRequiredSession(key).getLastAccessTime();<a name="line.177"></a>
<span class="sourceLineNo">178</span> }<a name="line.178"></a>
<span class="sourceLineNo">179</span><a name="line.179"></a>
<span class="sourceLineNo">180</span> public long getTimeout(SessionKey key) throws InvalidSessionException {<a name="line.180"></a>
<span class="sourceLineNo">181</span> return lookupRequiredSession(key).getTimeout();<a name="line.181"></a>
<span class="sourceLineNo">182</span> }<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span> public void setTimeout(SessionKey key, long maxIdleTimeInMillis) throws InvalidSessionException {<a name="line.184"></a>
<span class="sourceLineNo">185</span> Session s = lookupRequiredSession(key);<a name="line.185"></a>
<span class="sourceLineNo">186</span> s.setTimeout(maxIdleTimeInMillis);<a name="line.186"></a>
<span class="sourceLineNo">187</span> onChange(s);<a name="line.187"></a>
<span class="sourceLineNo">188</span> }<a name="line.188"></a>
<span class="sourceLineNo">189</span><a name="line.189"></a>
<span class="sourceLineNo">190</span> public void touch(SessionKey key) throws InvalidSessionException {<a name="line.190"></a>
<span class="sourceLineNo">191</span> Session s = lookupRequiredSession(key);<a name="line.191"></a>
<span class="sourceLineNo">192</span> s.touch();<a name="line.192"></a>
<span class="sourceLineNo">193</span> onChange(s);<a name="line.193"></a>
<span class="sourceLineNo">194</span> }<a name="line.194"></a>
<span class="sourceLineNo">195</span><a name="line.195"></a>
<span class="sourceLineNo">196</span> public String getHost(SessionKey key) {<a name="line.196"></a>
<span class="sourceLineNo">197</span> return lookupRequiredSession(key).getHost();<a name="line.197"></a>
<span class="sourceLineNo">198</span> }<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span> public Collection&lt;Object&gt; getAttributeKeys(SessionKey key) {<a name="line.200"></a>
<span class="sourceLineNo">201</span> Collection&lt;Object&gt; c = lookupRequiredSession(key).getAttributeKeys();<a name="line.201"></a>
<span class="sourceLineNo">202</span> if (!CollectionUtils.isEmpty(c)) {<a name="line.202"></a>
<span class="sourceLineNo">203</span> return Collections.unmodifiableCollection(c);<a name="line.203"></a>
<span class="sourceLineNo">204</span> }<a name="line.204"></a>
<span class="sourceLineNo">205</span> return Collections.emptySet();<a name="line.205"></a>
<span class="sourceLineNo">206</span> }<a name="line.206"></a>
<span class="sourceLineNo">207</span><a name="line.207"></a>
<span class="sourceLineNo">208</span> public Object getAttribute(SessionKey sessionKey, Object attributeKey) throws InvalidSessionException {<a name="line.208"></a>
<span class="sourceLineNo">209</span> return lookupRequiredSession(sessionKey).getAttribute(attributeKey);<a name="line.209"></a>
<span class="sourceLineNo">210</span> }<a name="line.210"></a>
<span class="sourceLineNo">211</span><a name="line.211"></a>
<span class="sourceLineNo">212</span> public void setAttribute(SessionKey sessionKey, Object attributeKey, Object value) throws InvalidSessionException {<a name="line.212"></a>
<span class="sourceLineNo">213</span> if (value == null) {<a name="line.213"></a>
<span class="sourceLineNo">214</span> removeAttribute(sessionKey, attributeKey);<a name="line.214"></a>
<span class="sourceLineNo">215</span> } else {<a name="line.215"></a>
<span class="sourceLineNo">216</span> Session s = lookupRequiredSession(sessionKey);<a name="line.216"></a>
<span class="sourceLineNo">217</span> s.setAttribute(attributeKey, value);<a name="line.217"></a>
<span class="sourceLineNo">218</span> onChange(s);<a name="line.218"></a>
<span class="sourceLineNo">219</span> }<a name="line.219"></a>
<span class="sourceLineNo">220</span> }<a name="line.220"></a>
<span class="sourceLineNo">221</span><a name="line.221"></a>
<span class="sourceLineNo">222</span> public Object removeAttribute(SessionKey sessionKey, Object attributeKey) throws InvalidSessionException {<a name="line.222"></a>
<span class="sourceLineNo">223</span> Session s = lookupRequiredSession(sessionKey);<a name="line.223"></a>
<span class="sourceLineNo">224</span> Object removed = s.removeAttribute(attributeKey);<a name="line.224"></a>
<span class="sourceLineNo">225</span> if (removed != null) {<a name="line.225"></a>
<span class="sourceLineNo">226</span> onChange(s);<a name="line.226"></a>
<span class="sourceLineNo">227</span> }<a name="line.227"></a>
<span class="sourceLineNo">228</span> return removed;<a name="line.228"></a>
<span class="sourceLineNo">229</span> }<a name="line.229"></a>
<span class="sourceLineNo">230</span><a name="line.230"></a>
<span class="sourceLineNo">231</span> public boolean isValid(SessionKey key) {<a name="line.231"></a>
<span class="sourceLineNo">232</span> try {<a name="line.232"></a>
<span class="sourceLineNo">233</span> checkValid(key);<a name="line.233"></a>
<span class="sourceLineNo">234</span> return true;<a name="line.234"></a>
<span class="sourceLineNo">235</span> } catch (InvalidSessionException e) {<a name="line.235"></a>
<span class="sourceLineNo">236</span> return false;<a name="line.236"></a>
<span class="sourceLineNo">237</span> }<a name="line.237"></a>
<span class="sourceLineNo">238</span> }<a name="line.238"></a>
<span class="sourceLineNo">239</span><a name="line.239"></a>
<span class="sourceLineNo">240</span> public void stop(SessionKey key) throws InvalidSessionException {<a name="line.240"></a>
<span class="sourceLineNo">241</span> Session session = lookupRequiredSession(key);<a name="line.241"></a>
<span class="sourceLineNo">242</span> try {<a name="line.242"></a>
<span class="sourceLineNo">243</span> if (log.isDebugEnabled()) {<a name="line.243"></a>
<span class="sourceLineNo">244</span> log.debug("Stopping session with id [" + session.getId() + "]");<a name="line.244"></a>
<span class="sourceLineNo">245</span> }<a name="line.245"></a>
<span class="sourceLineNo">246</span> session.stop();<a name="line.246"></a>
<span class="sourceLineNo">247</span> onStop(session, key);<a name="line.247"></a>
<span class="sourceLineNo">248</span> notifyStop(session);<a name="line.248"></a>
<span class="sourceLineNo">249</span> } finally {<a name="line.249"></a>
<span class="sourceLineNo">250</span> afterStopped(session);<a name="line.250"></a>
<span class="sourceLineNo">251</span> }<a name="line.251"></a>
<span class="sourceLineNo">252</span> }<a name="line.252"></a>
<span class="sourceLineNo">253</span><a name="line.253"></a>
<span class="sourceLineNo">254</span> protected void onStop(Session session, SessionKey key) {<a name="line.254"></a>
<span class="sourceLineNo">255</span> onStop(session);<a name="line.255"></a>
<span class="sourceLineNo">256</span> }<a name="line.256"></a>
<span class="sourceLineNo">257</span><a name="line.257"></a>
<span class="sourceLineNo">258</span> protected void onStop(Session session) {<a name="line.258"></a>
<span class="sourceLineNo">259</span> onChange(session);<a name="line.259"></a>
<span class="sourceLineNo">260</span> }<a name="line.260"></a>
<span class="sourceLineNo">261</span><a name="line.261"></a>
<span class="sourceLineNo">262</span> protected void afterStopped(Session session) {<a name="line.262"></a>
<span class="sourceLineNo">263</span> }<a name="line.263"></a>
<span class="sourceLineNo">264</span><a name="line.264"></a>
<span class="sourceLineNo">265</span> public void checkValid(SessionKey key) throws InvalidSessionException {<a name="line.265"></a>
<span class="sourceLineNo">266</span> //just try to acquire it. If there is a problem, an exception will be thrown:<a name="line.266"></a>
<span class="sourceLineNo">267</span> lookupRequiredSession(key);<a name="line.267"></a>
<span class="sourceLineNo">268</span> }<a name="line.268"></a>
<span class="sourceLineNo">269</span><a name="line.269"></a>
<span class="sourceLineNo">270</span> protected void onChange(Session s) {<a name="line.270"></a>
<span class="sourceLineNo">271</span> }<a name="line.271"></a>
<span class="sourceLineNo">272</span>}<a name="line.272"></a>
</pre>
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