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Posted to site-dev@james.apache.org by rd...@apache.org on 2011/05/08 18:41:14 UTC
svn commit: r1100766 [5/7] - in /james/site/trunk/www/mailet/ai: ./ apidocs/
apidocs/org/ apidocs/org/apache/ apidocs/org/apache/james/
apidocs/org/apache/james/ai/ apidocs/org/apache/james/ai/classic/
apidocs/org/apache/james/ai/classic/class-use/ api...
Added: james/site/trunk/www/mailet/ai/apidocs/src-html/org/apache/james/ai/classic/BayesianAnalysisFeeder.html
URL: http://svn.apache.org/viewvc/james/site/trunk/www/mailet/ai/apidocs/src-html/org/apache/james/ai/classic/BayesianAnalysisFeeder.html?rev=1100766&view=auto
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+<HTML>
+<BODY BGCOLOR="white">
+<PRE>
+<FONT color="green">001</FONT> /****************************************************************<a name="line.1"></a>
+<FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one *<a name="line.2"></a>
+<FONT color="green">003</FONT> * or more contributor license agreements. See the NOTICE file *<a name="line.3"></a>
+<FONT color="green">004</FONT> * distributed with this work for additional information *<a name="line.4"></a>
+<FONT color="green">005</FONT> * regarding copyright ownership. The ASF licenses this file *<a name="line.5"></a>
+<FONT color="green">006</FONT> * to you under the Apache License, Version 2.0 (the *<a name="line.6"></a>
+<FONT color="green">007</FONT> * "License"); you may not use this file except in compliance *<a name="line.7"></a>
+<FONT color="green">008</FONT> * with the License. You may obtain a copy of the License at *<a name="line.8"></a>
+<FONT color="green">009</FONT> * *<a name="line.9"></a>
+<FONT color="green">010</FONT> * http://www.apache.org/licenses/LICENSE-2.0 *<a name="line.10"></a>
+<FONT color="green">011</FONT> * *<a name="line.11"></a>
+<FONT color="green">012</FONT> * Unless required by applicable law or agreed to in writing, *<a name="line.12"></a>
+<FONT color="green">013</FONT> * software distributed under the License is distributed on an *<a name="line.13"></a>
+<FONT color="green">014</FONT> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *<a name="line.14"></a>
+<FONT color="green">015</FONT> * KIND, either express or implied. See the License for the *<a name="line.15"></a>
+<FONT color="green">016</FONT> * specific language governing permissions and limitations *<a name="line.16"></a>
+<FONT color="green">017</FONT> * under the License. *<a name="line.17"></a>
+<FONT color="green">018</FONT> ****************************************************************/<a name="line.18"></a>
+<FONT color="green">019</FONT> <a name="line.19"></a>
+<FONT color="green">020</FONT> package org.apache.james.ai.classic;<a name="line.20"></a>
+<FONT color="green">021</FONT> <a name="line.21"></a>
+<FONT color="green">022</FONT> import java.io.BufferedReader;<a name="line.22"></a>
+<FONT color="green">023</FONT> import java.io.ByteArrayOutputStream;<a name="line.23"></a>
+<FONT color="green">024</FONT> import java.io.StringReader;<a name="line.24"></a>
+<FONT color="green">025</FONT> import java.sql.Connection;<a name="line.25"></a>
+<FONT color="green">026</FONT> import java.util.Enumeration;<a name="line.26"></a>
+<FONT color="green">027</FONT> <a name="line.27"></a>
+<FONT color="green">028</FONT> import javax.annotation.Resource;<a name="line.28"></a>
+<FONT color="green">029</FONT> import javax.mail.Header;<a name="line.29"></a>
+<FONT color="green">030</FONT> import javax.mail.MessagingException;<a name="line.30"></a>
+<FONT color="green">031</FONT> import javax.mail.internet.MimeMessage;<a name="line.31"></a>
+<FONT color="green">032</FONT> import javax.sql.DataSource;<a name="line.32"></a>
+<FONT color="green">033</FONT> <a name="line.33"></a>
+<FONT color="green">034</FONT> import org.apache.mailet.Mail;<a name="line.34"></a>
+<FONT color="green">035</FONT> import org.apache.mailet.base.GenericMailet;<a name="line.35"></a>
+<FONT color="green">036</FONT> <a name="line.36"></a>
+<FONT color="green">037</FONT> /**<a name="line.37"></a>
+<FONT color="green">038</FONT> * <p><a name="line.38"></a>
+<FONT color="green">039</FONT> * Feeds ham OR spam messages to train the {@link BayesianAnalysis} mailet.<a name="line.39"></a>
+<FONT color="green">040</FONT> * </p><a name="line.40"></a>
+<FONT color="green">041</FONT> * <a name="line.41"></a>
+<FONT color="green">042</FONT> * <p><a name="line.42"></a>
+<FONT color="green">043</FONT> * The new token frequencies will be stored in a JDBC database.<a name="line.43"></a>
+<FONT color="green">044</FONT> * </p><a name="line.44"></a>
+<FONT color="green">045</FONT> * <a name="line.45"></a>
+<FONT color="green">046</FONT> * <p><a name="line.46"></a>
+<FONT color="green">047</FONT> * Sample configuration:<a name="line.47"></a>
+<FONT color="green">048</FONT> * </p><a name="line.48"></a>
+<FONT color="green">049</FONT> * <a name="line.49"></a>
+<FONT color="green">050</FONT> * <pre><a name="line.50"></a>
+<FONT color="green">051</FONT> * <code><a name="line.51"></a>
+<FONT color="green">052</FONT> * &lt;processor name="root"&gt;<a name="line.52"></a>
+<FONT color="green">053</FONT> * <a name="line.53"></a>
+<FONT color="green">054</FONT> * &lt;mailet match="RecipientIs=not.spam@thisdomain.com" class="BayesianAnalysisFeeder"&gt;<a name="line.54"></a>
+<FONT color="green">055</FONT> * &lt;repositoryPath&gt; db://maildb &lt;/repositoryPath&gt;<a name="line.55"></a>
+<FONT color="green">056</FONT> * &lt;feedType&gt;ham&lt;/feedType&gt;<a name="line.56"></a>
+<FONT color="green">057</FONT> * &lt;!--<a name="line.57"></a>
+<FONT color="green">058</FONT> * Set this to the maximum message size (in bytes) that a message may have<a name="line.58"></a>
+<FONT color="green">059</FONT> * to be analyzed (default is 100000).<a name="line.59"></a>
+<FONT color="green">060</FONT> * --&gt;<a name="line.60"></a>
+<FONT color="green">061</FONT> * &lt;maxSize&gt;100000&lt;/maxSize&gt;<a name="line.61"></a>
+<FONT color="green">062</FONT> * &lt;/mailet&gt;<a name="line.62"></a>
+<FONT color="green">063</FONT> * <a name="line.63"></a>
+<FONT color="green">064</FONT> * &lt;mailet match="RecipientIs=spam@thisdomain.com" class="BayesianAnalysisFeeder"&gt;<a name="line.64"></a>
+<FONT color="green">065</FONT> * &lt;repositoryPath&gt; db://maildb &lt;/repositoryPath&gt;<a name="line.65"></a>
+<FONT color="green">066</FONT> * &lt;feedType&gt;spam&lt;/feedType&gt;<a name="line.66"></a>
+<FONT color="green">067</FONT> * &lt;!--<a name="line.67"></a>
+<FONT color="green">068</FONT> * Set this to the maximum message size (in bytes) that a message may have<a name="line.68"></a>
+<FONT color="green">069</FONT> * to be analyzed (default is 100000).<a name="line.69"></a>
+<FONT color="green">070</FONT> * --&gt;<a name="line.70"></a>
+<FONT color="green">071</FONT> * &lt;maxSize&gt;100000&lt;/maxSize&gt;<a name="line.71"></a>
+<FONT color="green">072</FONT> * &lt;/mailet&gt;<a name="line.72"></a>
+<FONT color="green">073</FONT> * <a name="line.73"></a>
+<FONT color="green">074</FONT> * &lt;processor&gt;<a name="line.74"></a>
+<FONT color="green">075</FONT> * </code><a name="line.75"></a>
+<FONT color="green">076</FONT> * </pre><a name="line.76"></a>
+<FONT color="green">077</FONT> * <a name="line.77"></a>
+<FONT color="green">078</FONT> * <p><a name="line.78"></a>
+<FONT color="green">079</FONT> * The previous example will allow the user to send messages to the server and<a name="line.79"></a>
+<FONT color="green">080</FONT> * use the recipient email address as the indicator for whether the message is<a name="line.80"></a>
+<FONT color="green">081</FONT> * ham or spam.<a name="line.81"></a>
+<FONT color="green">082</FONT> * </p><a name="line.82"></a>
+<FONT color="green">083</FONT> * <a name="line.83"></a>
+<FONT color="green">084</FONT> * <p><a name="line.84"></a>
+<FONT color="green">085</FONT> * Using the example above, send good messages (ham not spam) to the email<a name="line.85"></a>
+<FONT color="green">086</FONT> * address "not.spam@thisdomain.com" to pump good messages into the feeder, and<a name="line.86"></a>
+<FONT color="green">087</FONT> * send spam messages (spam not ham) to the email address "spam@thisdomain.com"<a name="line.87"></a>
+<FONT color="green">088</FONT> * to pump spam messages into the feeder.<a name="line.88"></a>
+<FONT color="green">089</FONT> * </p><a name="line.89"></a>
+<FONT color="green">090</FONT> * <a name="line.90"></a>
+<FONT color="green">091</FONT> * <p><a name="line.91"></a>
+<FONT color="green">092</FONT> * The bayesian database tables will be updated during the training reflecting<a name="line.92"></a>
+<FONT color="green">093</FONT> * the new data<a name="line.93"></a>
+<FONT color="green">094</FONT> * </p><a name="line.94"></a>
+<FONT color="green">095</FONT> * <a name="line.95"></a>
+<FONT color="green">096</FONT> * <p><a name="line.96"></a>
+<FONT color="green">097</FONT> * At the end the mail will be destroyed (ghosted).<a name="line.97"></a>
+<FONT color="green">098</FONT> * </p><a name="line.98"></a>
+<FONT color="green">099</FONT> * <a name="line.99"></a>
+<FONT color="green">100</FONT> * <p><a name="line.100"></a>
+<FONT color="green">101</FONT> * <b>The correct approach is to send the original ham/spam message as an<a name="line.101"></a>
+<FONT color="green">102</FONT> * attachment to another message sent to the feeder; all the headers of the<a name="line.102"></a>
+<FONT color="green">103</FONT> * enveloping message will be removed and only the original message's tokens<a name="line.103"></a>
+<FONT color="green">104</FONT> * will be analyzed.</b><a name="line.104"></a>
+<FONT color="green">105</FONT> * </p><a name="line.105"></a>
+<FONT color="green">106</FONT> * <a name="line.106"></a>
+<FONT color="green">107</FONT> * <p><a name="line.107"></a>
+<FONT color="green">108</FONT> * After a training session, the frequency <i>Corpus</i> used by<a name="line.108"></a>
+<FONT color="green">109</FONT> * <code>BayesianAnalysis</code> must be rebuilt from the database, in order to<a name="line.109"></a>
+<FONT color="green">110</FONT> * take advantage of the new token frequencies. Every 10 minutes a special<a name="line.110"></a>
+<FONT color="green">111</FONT> * thread in the <code>BayesianAnalysis</code> mailet will check if any change<a name="line.111"></a>
+<FONT color="green">112</FONT> * was made to the database, and rebuild the corpus if necessary.<a name="line.112"></a>
+<FONT color="green">113</FONT> * </p><a name="line.113"></a>
+<FONT color="green">114</FONT> * <a name="line.114"></a>
+<FONT color="green">115</FONT> * <p><a name="line.115"></a>
+<FONT color="green">116</FONT> * Only one message at a time is scanned (the database update activity is<a name="line.116"></a>
+<FONT color="green">117</FONT> * <i>synchronized</i>) in order to avoid too much database locking, as<a name="line.117"></a>
+<FONT color="green">118</FONT> * thousands of rows may be updated just for one message fed.<a name="line.118"></a>
+<FONT color="green">119</FONT> * </p><a name="line.119"></a>
+<FONT color="green">120</FONT> * <a name="line.120"></a>
+<FONT color="green">121</FONT> * @see BayesianAnalysis<a name="line.121"></a>
+<FONT color="green">122</FONT> * @see BayesianAnalyzer<a name="line.122"></a>
+<FONT color="green">123</FONT> * @see JDBCBayesianAnalyzer<a name="line.123"></a>
+<FONT color="green">124</FONT> * @since 2.3.0<a name="line.124"></a>
+<FONT color="green">125</FONT> */<a name="line.125"></a>
+<FONT color="green">126</FONT> <a name="line.126"></a>
+<FONT color="green">127</FONT> public class BayesianAnalysisFeeder extends GenericMailet {<a name="line.127"></a>
+<FONT color="green">128</FONT> /**<a name="line.128"></a>
+<FONT color="green">129</FONT> * The JDBCUtil helper class<a name="line.129"></a>
+<FONT color="green">130</FONT> */<a name="line.130"></a>
+<FONT color="green">131</FONT> private final JDBCUtil theJDBCUtil = new JDBCUtil() {<a name="line.131"></a>
+<FONT color="green">132</FONT> protected void delegatedLog(String logString) {<a name="line.132"></a>
+<FONT color="green">133</FONT> log("BayesianAnalysisFeeder: " + logString);<a name="line.133"></a>
+<FONT color="green">134</FONT> }<a name="line.134"></a>
+<FONT color="green">135</FONT> };<a name="line.135"></a>
+<FONT color="green">136</FONT> <a name="line.136"></a>
+<FONT color="green">137</FONT> /**<a name="line.137"></a>
+<FONT color="green">138</FONT> * The JDBCBayesianAnalyzer class that does all the work.<a name="line.138"></a>
+<FONT color="green">139</FONT> */<a name="line.139"></a>
+<FONT color="green">140</FONT> private JDBCBayesianAnalyzer analyzer = new JDBCBayesianAnalyzer() {<a name="line.140"></a>
+<FONT color="green">141</FONT> protected void delegatedLog(String logString) {<a name="line.141"></a>
+<FONT color="green">142</FONT> log("BayesianAnalysisFeeder: " + logString);<a name="line.142"></a>
+<FONT color="green">143</FONT> }<a name="line.143"></a>
+<FONT color="green">144</FONT> };<a name="line.144"></a>
+<FONT color="green">145</FONT> <a name="line.145"></a>
+<FONT color="green">146</FONT> private DataSource datasource;<a name="line.146"></a>
+<FONT color="green">147</FONT> private String repositoryPath;<a name="line.147"></a>
+<FONT color="green">148</FONT> <a name="line.148"></a>
+<FONT color="green">149</FONT> private String feedType;<a name="line.149"></a>
+<FONT color="green">150</FONT> <a name="line.150"></a>
+<FONT color="green">151</FONT> /**<a name="line.151"></a>
+<FONT color="green">152</FONT> * Return a string describing this mailet.<a name="line.152"></a>
+<FONT color="green">153</FONT> * <a name="line.153"></a>
+<FONT color="green">154</FONT> * @return a string describing this mailet<a name="line.154"></a>
+<FONT color="green">155</FONT> */<a name="line.155"></a>
+<FONT color="green">156</FONT> public String getMailetInfo() {<a name="line.156"></a>
+<FONT color="green">157</FONT> return "BayesianAnalysisFeeder Mailet";<a name="line.157"></a>
+<FONT color="green">158</FONT> }<a name="line.158"></a>
+<FONT color="green">159</FONT> <a name="line.159"></a>
+<FONT color="green">160</FONT> /**<a name="line.160"></a>
+<FONT color="green">161</FONT> * Holds value of property maxSize.<a name="line.161"></a>
+<FONT color="green">162</FONT> */<a name="line.162"></a>
+<FONT color="green">163</FONT> private int maxSize = 100000;<a name="line.163"></a>
+<FONT color="green">164</FONT> <a name="line.164"></a>
+<FONT color="green">165</FONT> private SystemContext fs;<a name="line.165"></a>
+<FONT color="green">166</FONT> <a name="line.166"></a>
+<FONT color="green">167</FONT> /**<a name="line.167"></a>
+<FONT color="green">168</FONT> * Getter for property maxSize.<a name="line.168"></a>
+<FONT color="green">169</FONT> * <a name="line.169"></a>
+<FONT color="green">170</FONT> * @return Value of property maxSize.<a name="line.170"></a>
+<FONT color="green">171</FONT> */<a name="line.171"></a>
+<FONT color="green">172</FONT> public int getMaxSize() {<a name="line.172"></a>
+<FONT color="green">173</FONT> <a name="line.173"></a>
+<FONT color="green">174</FONT> return this.maxSize;<a name="line.174"></a>
+<FONT color="green">175</FONT> }<a name="line.175"></a>
+<FONT color="green">176</FONT> <a name="line.176"></a>
+<FONT color="green">177</FONT> @Resource(name = "datasource")<a name="line.177"></a>
+<FONT color="green">178</FONT> public void setDataSource(DataSource datasource) {<a name="line.178"></a>
+<FONT color="green">179</FONT> this.datasource = datasource;<a name="line.179"></a>
+<FONT color="green">180</FONT> }<a name="line.180"></a>
+<FONT color="green">181</FONT> <a name="line.181"></a>
+<FONT color="green">182</FONT> /**<a name="line.182"></a>
+<FONT color="green">183</FONT> * Setter for property maxSize.<a name="line.183"></a>
+<FONT color="green">184</FONT> * <a name="line.184"></a>
+<FONT color="green">185</FONT> * @param maxSize<a name="line.185"></a>
+<FONT color="green">186</FONT> * New value of property maxSize.<a name="line.186"></a>
+<FONT color="green">187</FONT> */<a name="line.187"></a>
+<FONT color="green">188</FONT> public void setMaxSize(int maxSize) {<a name="line.188"></a>
+<FONT color="green">189</FONT> <a name="line.189"></a>
+<FONT color="green">190</FONT> this.maxSize = maxSize;<a name="line.190"></a>
+<FONT color="green">191</FONT> }<a name="line.191"></a>
+<FONT color="green">192</FONT> <a name="line.192"></a>
+<FONT color="green">193</FONT> @Resource(name = "filesystem")<a name="line.193"></a>
+<FONT color="green">194</FONT> public void setFileSystem(SystemContext fs) {<a name="line.194"></a>
+<FONT color="green">195</FONT> this.fs = fs;<a name="line.195"></a>
+<FONT color="green">196</FONT> }<a name="line.196"></a>
+<FONT color="green">197</FONT> <a name="line.197"></a>
+<FONT color="green">198</FONT> /**<a name="line.198"></a>
+<FONT color="green">199</FONT> * Mailet initialization routine.<a name="line.199"></a>
+<FONT color="green">200</FONT> * <a name="line.200"></a>
+<FONT color="green">201</FONT> * @throws MessagingException<a name="line.201"></a>
+<FONT color="green">202</FONT> * if a problem arises<a name="line.202"></a>
+<FONT color="green">203</FONT> */<a name="line.203"></a>
+<FONT color="green">204</FONT> public void init() throws MessagingException {<a name="line.204"></a>
+<FONT color="green">205</FONT> repositoryPath = getInitParameter("repositoryPath");<a name="line.205"></a>
+<FONT color="green">206</FONT> <a name="line.206"></a>
+<FONT color="green">207</FONT> if (repositoryPath == null) {<a name="line.207"></a>
+<FONT color="green">208</FONT> throw new MessagingException("repositoryPath is null");<a name="line.208"></a>
+<FONT color="green">209</FONT> }<a name="line.209"></a>
+<FONT color="green">210</FONT> <a name="line.210"></a>
+<FONT color="green">211</FONT> feedType = getInitParameter("feedType");<a name="line.211"></a>
+<FONT color="green">212</FONT> if (feedType == null) {<a name="line.212"></a>
+<FONT color="green">213</FONT> throw new MessagingException("feedType is null");<a name="line.213"></a>
+<FONT color="green">214</FONT> }<a name="line.214"></a>
+<FONT color="green">215</FONT> <a name="line.215"></a>
+<FONT color="green">216</FONT> String maxSizeParam = getInitParameter("maxSize");<a name="line.216"></a>
+<FONT color="green">217</FONT> if (maxSizeParam != null) {<a name="line.217"></a>
+<FONT color="green">218</FONT> setMaxSize(Integer.parseInt(maxSizeParam));<a name="line.218"></a>
+<FONT color="green">219</FONT> }<a name="line.219"></a>
+<FONT color="green">220</FONT> log("maxSize: " + getMaxSize());<a name="line.220"></a>
+<FONT color="green">221</FONT> <a name="line.221"></a>
+<FONT color="green">222</FONT> initDb();<a name="line.222"></a>
+<FONT color="green">223</FONT> <a name="line.223"></a>
+<FONT color="green">224</FONT> }<a name="line.224"></a>
+<FONT color="green">225</FONT> <a name="line.225"></a>
+<FONT color="green">226</FONT> private void initDb() throws MessagingException {<a name="line.226"></a>
+<FONT color="green">227</FONT> <a name="line.227"></a>
+<FONT color="green">228</FONT> try {<a name="line.228"></a>
+<FONT color="green">229</FONT> analyzer.initSqlQueries(datasource.getConnection(), fs.readXml("sqlResources.xml"));<a name="line.229"></a>
+<FONT color="green">230</FONT> } catch (Exception e) {<a name="line.230"></a>
+<FONT color="green">231</FONT> throw new MessagingException("Exception initializing queries", e);<a name="line.231"></a>
+<FONT color="green">232</FONT> }<a name="line.232"></a>
+<FONT color="green">233</FONT> <a name="line.233"></a>
+<FONT color="green">234</FONT> }<a name="line.234"></a>
+<FONT color="green">235</FONT> <a name="line.235"></a>
+<FONT color="green">236</FONT> /**<a name="line.236"></a>
+<FONT color="green">237</FONT> * Scans the mail and updates the token frequencies in the database.<a name="line.237"></a>
+<FONT color="green">238</FONT> * <a name="line.238"></a>
+<FONT color="green">239</FONT> * The method is synchronized in order to avoid too much database locking,<a name="line.239"></a>
+<FONT color="green">240</FONT> * as thousands of rows may be updated just for one message fed.<a name="line.240"></a>
+<FONT color="green">241</FONT> * <a name="line.241"></a>
+<FONT color="green">242</FONT> * @param mail<a name="line.242"></a>
+<FONT color="green">243</FONT> * The Mail message to be scanned.<a name="line.243"></a>
+<FONT color="green">244</FONT> */<a name="line.244"></a>
+<FONT color="green">245</FONT> public void service(Mail mail) {<a name="line.245"></a>
+<FONT color="green">246</FONT> boolean dbUpdated = false;<a name="line.246"></a>
+<FONT color="green">247</FONT> <a name="line.247"></a>
+<FONT color="green">248</FONT> mail.setState(Mail.GHOST);<a name="line.248"></a>
+<FONT color="green">249</FONT> <a name="line.249"></a>
+<FONT color="green">250</FONT> ByteArrayOutputStream baos = new ByteArrayOutputStream();<a name="line.250"></a>
+<FONT color="green">251</FONT> <a name="line.251"></a>
+<FONT color="green">252</FONT> Connection conn = null;<a name="line.252"></a>
+<FONT color="green">253</FONT> <a name="line.253"></a>
+<FONT color="green">254</FONT> try {<a name="line.254"></a>
+<FONT color="green">255</FONT> <a name="line.255"></a>
+<FONT color="green">256</FONT> MimeMessage message = mail.getMessage();<a name="line.256"></a>
+<FONT color="green">257</FONT> <a name="line.257"></a>
+<FONT color="green">258</FONT> String messageId = message.getMessageID();<a name="line.258"></a>
+<FONT color="green">259</FONT> <a name="line.259"></a>
+<FONT color="green">260</FONT> if (message.getSize() > getMaxSize()) {<a name="line.260"></a>
+<FONT color="green">261</FONT> log(messageId + " Feeding HAM/SPAM ignored because message size > " + getMaxSize() + ": " + message.getSize());<a name="line.261"></a>
+<FONT color="green">262</FONT> return;<a name="line.262"></a>
+<FONT color="green">263</FONT> }<a name="line.263"></a>
+<FONT color="green">264</FONT> <a name="line.264"></a>
+<FONT color="green">265</FONT> clearAllHeaders(message);<a name="line.265"></a>
+<FONT color="green">266</FONT> <a name="line.266"></a>
+<FONT color="green">267</FONT> message.writeTo(baos);<a name="line.267"></a>
+<FONT color="green">268</FONT> <a name="line.268"></a>
+<FONT color="green">269</FONT> BufferedReader br = new BufferedReader(new StringReader(baos.toString()));<a name="line.269"></a>
+<FONT color="green">270</FONT> <a name="line.270"></a>
+<FONT color="green">271</FONT> // this is synchronized to avoid concurrent update of the corpus<a name="line.271"></a>
+<FONT color="green">272</FONT> synchronized (JDBCBayesianAnalyzer.DATABASE_LOCK) {<a name="line.272"></a>
+<FONT color="green">273</FONT> <a name="line.273"></a>
+<FONT color="green">274</FONT> conn = datasource.getConnection();<a name="line.274"></a>
+<FONT color="green">275</FONT> <a name="line.275"></a>
+<FONT color="green">276</FONT> if (conn.getAutoCommit()) {<a name="line.276"></a>
+<FONT color="green">277</FONT> conn.setAutoCommit(false);<a name="line.277"></a>
+<FONT color="green">278</FONT> }<a name="line.278"></a>
+<FONT color="green">279</FONT> <a name="line.279"></a>
+<FONT color="green">280</FONT> dbUpdated = true;<a name="line.280"></a>
+<FONT color="green">281</FONT> <a name="line.281"></a>
+<FONT color="green">282</FONT> // Clear out any existing word/counts etc..<a name="line.282"></a>
+<FONT color="green">283</FONT> analyzer.clear();<a name="line.283"></a>
+<FONT color="green">284</FONT> <a name="line.284"></a>
+<FONT color="green">285</FONT> if ("ham".equalsIgnoreCase(feedType)) {<a name="line.285"></a>
+<FONT color="green">286</FONT> log(messageId + " Feeding HAM");<a name="line.286"></a>
+<FONT color="green">287</FONT> // Process the stream as ham (not spam).<a name="line.287"></a>
+<FONT color="green">288</FONT> analyzer.addHam(br);<a name="line.288"></a>
+<FONT color="green">289</FONT> <a name="line.289"></a>
+<FONT color="green">290</FONT> // Update storage statistics.<a name="line.290"></a>
+<FONT color="green">291</FONT> analyzer.updateHamTokens(conn);<a name="line.291"></a>
+<FONT color="green">292</FONT> } else {<a name="line.292"></a>
+<FONT color="green">293</FONT> log(messageId + " Feeding SPAM");<a name="line.293"></a>
+<FONT color="green">294</FONT> // Process the stream as spam.<a name="line.294"></a>
+<FONT color="green">295</FONT> analyzer.addSpam(br);<a name="line.295"></a>
+<FONT color="green">296</FONT> <a name="line.296"></a>
+<FONT color="green">297</FONT> // Update storage statistics.<a name="line.297"></a>
+<FONT color="green">298</FONT> analyzer.updateSpamTokens(conn);<a name="line.298"></a>
+<FONT color="green">299</FONT> }<a name="line.299"></a>
+<FONT color="green">300</FONT> <a name="line.300"></a>
+<FONT color="green">301</FONT> // Commit our changes if necessary.<a name="line.301"></a>
+<FONT color="green">302</FONT> if (conn != null && dbUpdated && !conn.getAutoCommit()) {<a name="line.302"></a>
+<FONT color="green">303</FONT> conn.commit();<a name="line.303"></a>
+<FONT color="green">304</FONT> dbUpdated = false;<a name="line.304"></a>
+<FONT color="green">305</FONT> log(messageId + " Training ended successfully");<a name="line.305"></a>
+<FONT color="green">306</FONT> JDBCBayesianAnalyzer.touchLastDatabaseUpdateTime();<a name="line.306"></a>
+<FONT color="green">307</FONT> }<a name="line.307"></a>
+<FONT color="green">308</FONT> <a name="line.308"></a>
+<FONT color="green">309</FONT> }<a name="line.309"></a>
+<FONT color="green">310</FONT> <a name="line.310"></a>
+<FONT color="green">311</FONT> } catch (java.sql.SQLException se) {<a name="line.311"></a>
+<FONT color="green">312</FONT> log("SQLException: " + se.getMessage());<a name="line.312"></a>
+<FONT color="green">313</FONT> } catch (java.io.IOException ioe) {<a name="line.313"></a>
+<FONT color="green">314</FONT> log("IOException: " + ioe.getMessage());<a name="line.314"></a>
+<FONT color="green">315</FONT> } catch (javax.mail.MessagingException me) {<a name="line.315"></a>
+<FONT color="green">316</FONT> log("MessagingException: " + me.getMessage());<a name="line.316"></a>
+<FONT color="green">317</FONT> } finally {<a name="line.317"></a>
+<FONT color="green">318</FONT> // Rollback our changes if necessary.<a name="line.318"></a>
+<FONT color="green">319</FONT> try {<a name="line.319"></a>
+<FONT color="green">320</FONT> if (conn != null && dbUpdated && !conn.getAutoCommit()) {<a name="line.320"></a>
+<FONT color="green">321</FONT> conn.rollback();<a name="line.321"></a>
+<FONT color="green">322</FONT> dbUpdated = false;<a name="line.322"></a>
+<FONT color="green">323</FONT> }<a name="line.323"></a>
+<FONT color="green">324</FONT> } catch (Exception e) {<a name="line.324"></a>
+<FONT color="green">325</FONT> }<a name="line.325"></a>
+<FONT color="green">326</FONT> theJDBCUtil.closeJDBCConnection(conn);<a name="line.326"></a>
+<FONT color="green">327</FONT> }<a name="line.327"></a>
+<FONT color="green">328</FONT> }<a name="line.328"></a>
+<FONT color="green">329</FONT> <a name="line.329"></a>
+<FONT color="green">330</FONT> private void clearAllHeaders(MimeMessage message) throws javax.mail.MessagingException {<a name="line.330"></a>
+<FONT color="green">331</FONT> @SuppressWarnings("rawtypes")<a name="line.331"></a>
+<FONT color="green">332</FONT> Enumeration headers = message.getAllHeaders();<a name="line.332"></a>
+<FONT color="green">333</FONT> <a name="line.333"></a>
+<FONT color="green">334</FONT> while (headers.hasMoreElements()) {<a name="line.334"></a>
+<FONT color="green">335</FONT> Header header = (Header) headers.nextElement();<a name="line.335"></a>
+<FONT color="green">336</FONT> try {<a name="line.336"></a>
+<FONT color="green">337</FONT> message.removeHeader(header.getName());<a name="line.337"></a>
+<FONT color="green">338</FONT> } catch (javax.mail.MessagingException me) {<a name="line.338"></a>
+<FONT color="green">339</FONT> }<a name="line.339"></a>
+<FONT color="green">340</FONT> }<a name="line.340"></a>
+<FONT color="green">341</FONT> message.saveChanges();<a name="line.341"></a>
+<FONT color="green">342</FONT> }<a name="line.342"></a>
+<FONT color="green">343</FONT> <a name="line.343"></a>
+<FONT color="green">344</FONT> }<a name="line.344"></a>
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