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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, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.http.jmx;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.io.PrintWriter;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.lang.management.ManagementFactory;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import javax.management.MBeanServer;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import javax.management.MalformedObjectNameException;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import javax.management.ObjectName;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import javax.management.openmbean.CompositeData;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import javax.management.openmbean.TabularData;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import javax.servlet.ServletException;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import javax.servlet.http.HttpServlet;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import javax.servlet.http.HttpServletRequest;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import javax.servlet.http.HttpServletResponse;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.http.HttpServer;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.util.JSONBean;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.slf4j.Logger;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import org.slf4j.LoggerFactory;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span><a name="line.37"></a> |
| <span class="sourceLineNo">038</span>/*<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * This servlet is based off of the JMXProxyServlet from Tomcat 7.0.14. It has<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * been rewritten to be read only and to output in a JSON format so it is not<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * really that close to the original.<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> */<a name="line.42"></a> |
| <span class="sourceLineNo">043</span>/**<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * Provides Read only web access to JMX.<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * <p><a name="line.45"></a> |
| <span class="sourceLineNo">046</span> * This servlet generally will be placed under the /jmx URL for each HttpServer. It provides read<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> * only access to JMX metrics. The optional <code>qry</code> parameter may be used to query only a<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> * subset of the JMX Beans. This query functionality is provided through the<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> * {@link MBeanServer#queryNames(ObjectName, javax.management.QueryExp)} method.<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> * </p><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> * <p><a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * For example <code>http://.../jmx?qry=Hadoop:*</code> will return all hadoop metrics exposed<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> * through JMX.<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * </p><a name="line.54"></a> |
| <span class="sourceLineNo">055</span> * <p><a name="line.55"></a> |
| <span class="sourceLineNo">056</span> * The optional <code>get</code> parameter is used to query an specific attribute of a JMX bean. The<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> * format of the URL is <code>http://.../jmx?get=MXBeanName::AttributeName</code><a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * </p><a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * <p><a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * For example <code><a name="line.60"></a> |
| <span class="sourceLineNo">061</span> * http://../jmx?get=Hadoop:service=NameNode,name=NameNodeInfo::ClusterId<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> * </code> will return the cluster id of the namenode mxbean.<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> * </p><a name="line.63"></a> |
| <span class="sourceLineNo">064</span> * <p><a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * If we are not sure on the exact attribute and we want to get all the attributes that match one or<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> * more given pattern then the format is<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * <code>http://.../jmx?get=MXBeanName::*[RegExp1],*[RegExp2]</code><a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * </p><a name="line.68"></a> |
| <span class="sourceLineNo">069</span> * <p><a name="line.69"></a> |
| <span class="sourceLineNo">070</span> * For example <code><a name="line.70"></a> |
| <span class="sourceLineNo">071</span> * <p><a name="line.71"></a> |
| <span class="sourceLineNo">072</span> * http://../jmx?get=Hadoop:service=HBase,name=RegionServer,sub=Tables::[a-zA-z_0-9]*memStoreSize<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> * </p><a name="line.73"></a> |
| <span class="sourceLineNo">074</span> * <p><a name="line.74"></a> |
| <span class="sourceLineNo">075</span> * http://../jmx?get=Hadoop:service=HBase,name=RegionServer,sub=Tables::[a-zA-z_0-9]*memStoreSize,[a-zA-z_0-9]*storeFileSize<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> * </p><a name="line.76"></a> |
| <span class="sourceLineNo">077</span> * </code><a name="line.77"></a> |
| <span class="sourceLineNo">078</span> * </p><a name="line.78"></a> |
| <span class="sourceLineNo">079</span> * If the <code>qry</code> or the <code>get</code> parameter is not formatted correctly then a 400<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * BAD REQUEST http response code will be returned.<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> * </p><a name="line.81"></a> |
| <span class="sourceLineNo">082</span> * <p><a name="line.82"></a> |
| <span class="sourceLineNo">083</span> * If a resouce such as a mbean or attribute can not be found, a 404 SC_NOT_FOUND http response code<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> * will be returned.<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> * </p><a name="line.85"></a> |
| <span class="sourceLineNo">086</span> * <p><a name="line.86"></a> |
| <span class="sourceLineNo">087</span> * The return format is JSON and in the form<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> * </p><a name="line.88"></a> |
| <span class="sourceLineNo">089</span> *<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> * <pre><a name="line.90"></a> |
| <span class="sourceLineNo">091</span> * <code><a name="line.91"></a> |
| <span class="sourceLineNo">092</span> * {<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> * "beans" : [<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> * {<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> * "name":"bean-name"<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> * ...<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> * }<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> * </code><a name="line.100"></a> |
| <span class="sourceLineNo">101</span> * </pre><a name="line.101"></a> |
| <span class="sourceLineNo">102</span> * <p><a name="line.102"></a> |
| <span class="sourceLineNo">103</span> * The servlet attempts to convert the the JMXBeans into JSON. Each bean's attributes will be<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> * converted to a JSON object member. If the attribute is a boolean, a number, a string, or an array<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> * it will be converted to the JSON equivalent. If the value is a {@link CompositeData} then it will<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> * be converted to a JSON object with the keys as the name of the JSON member and the value is<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> * converted following these same rules. If the value is a {@link TabularData} then it will be<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> * converted to an array of the {@link CompositeData} elements that it contains. All other objects<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> * will be converted to a string and output as such. The bean's name and modelerType will be<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> * returned for all beans. Optional paramater "callback" should be used to deliver JSONP response.<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> * </p><a name="line.111"></a> |
| <span class="sourceLineNo">112</span> */<a name="line.112"></a> |
| <span class="sourceLineNo">113</span>@InterfaceAudience.Private<a name="line.113"></a> |
| <span class="sourceLineNo">114</span>public class JMXJsonServlet extends HttpServlet {<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> private static final Logger LOG = LoggerFactory.getLogger(JMXJsonServlet.class);<a name="line.115"></a> |
| <span class="sourceLineNo">116</span><a name="line.116"></a> |
| <span class="sourceLineNo">117</span> private static final long serialVersionUID = 1L;<a name="line.117"></a> |
| <span class="sourceLineNo">118</span><a name="line.118"></a> |
| <span class="sourceLineNo">119</span> private static final String CALLBACK_PARAM = "callback";<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> /**<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> * If query string includes 'description', then we will emit bean and attribute descriptions to<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> * output IFF they are not null and IFF the description is not the same as the attribute name:<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> * i.e. specify a URL like so: /jmx?description=true<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> */<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> private static final String INCLUDE_DESCRIPTION = "description";<a name="line.125"></a> |
| <span class="sourceLineNo">126</span><a name="line.126"></a> |
| <span class="sourceLineNo">127</span> /**<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> * MBean server.<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> */<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> protected transient MBeanServer mBeanServer;<a name="line.130"></a> |
| <span class="sourceLineNo">131</span><a name="line.131"></a> |
| <span class="sourceLineNo">132</span> protected transient JSONBean jsonBeanWriter;<a name="line.132"></a> |
| <span class="sourceLineNo">133</span><a name="line.133"></a> |
| <span class="sourceLineNo">134</span> /**<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> * Initialize this servlet.<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> */<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> @Override<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> public void init() throws ServletException {<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> // Retrieve the MBean server<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> mBeanServer = ManagementFactory.getPlatformMBeanServer();<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> this.jsonBeanWriter = new JSONBean();<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> * Process a GET request for the specified resource. n * The servlet request we are processing n *<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> * The servlet response we are creating<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> */<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> @Override<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> try {<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> if (!HttpServer.isInstrumentationAccessAllowed(getServletContext(), request, response)) {<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> return;<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> }<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> String jsonpcb = null;<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> PrintWriter writer = null;<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> JSONBean.Writer beanWriter = null;<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> try {<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> jsonpcb = checkCallbackName(request.getParameter(CALLBACK_PARAM));<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> writer = response.getWriter();<a name="line.159"></a> |
| <span class="sourceLineNo">160</span><a name="line.160"></a> |
| <span class="sourceLineNo">161</span> // "callback" parameter implies JSONP outpout<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> if (jsonpcb != null) {<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> response.setContentType("application/javascript; charset=utf8");<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> writer.write(jsonpcb + "(");<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> } else {<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> response.setContentType("application/json; charset=utf8");<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> }<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> beanWriter = this.jsonBeanWriter.open(writer);<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> // Should we output description on each attribute and bean?<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> String tmpStr = request.getParameter(INCLUDE_DESCRIPTION);<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> boolean description = tmpStr != null && tmpStr.length() > 0;<a name="line.171"></a> |
| <span class="sourceLineNo">172</span><a name="line.172"></a> |
| <span class="sourceLineNo">173</span> // query per mbean attribute<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> String getmethod = request.getParameter("get");<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> if (getmethod != null) {<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> String[] splitStrings = getmethod.split("\\:\\:");<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> if (splitStrings.length != 2) {<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> beanWriter.write("result", "ERROR");<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> beanWriter.write("message", "query format is not as expected.");<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> beanWriter.flush();<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> response.setStatus(HttpServletResponse.SC_BAD_REQUEST);<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> return;<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> }<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> if (<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> beanWriter.write(this.mBeanServer, new ObjectName(splitStrings[0]), splitStrings[1],<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> description) != 0<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> ) {<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> beanWriter.flush();<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> response.setStatus(HttpServletResponse.SC_BAD_REQUEST);<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> }<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> return;<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> }<a name="line.192"></a> |
| <span class="sourceLineNo">193</span><a name="line.193"></a> |
| <span class="sourceLineNo">194</span> // query per mbean<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> String qry = request.getParameter("qry");<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> if (qry == null) {<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> qry = "*:*";<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> }<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> String excl = request.getParameter("excl");<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> ObjectName excluded = excl == null ? null : new ObjectName(excl);<a name="line.200"></a> |
| <span class="sourceLineNo">201</span><a name="line.201"></a> |
| <span class="sourceLineNo">202</span> if (<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> beanWriter.write(this.mBeanServer, new ObjectName(qry), null, description, excluded) != 0<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> ) {<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> beanWriter.flush();<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> response.setStatus(HttpServletResponse.SC_BAD_REQUEST);<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> }<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> } finally {<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> if (beanWriter != null) {<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> beanWriter.close();<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> }<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> if (jsonpcb != null) {<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> writer.write(");");<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> }<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> if (writer != null) {<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> writer.close();<a name="line.216"></a> |
| <span class="sourceLineNo">217</span> }<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> }<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> } catch (IOException e) {<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> LOG.error("Caught an exception while processing JMX request", e);<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> } catch (MalformedObjectNameException e) {<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> LOG.error("Caught an exception while processing JMX request", e);<a name="line.223"></a> |
| <span class="sourceLineNo">224</span> response.sendError(HttpServletResponse.SC_BAD_REQUEST);<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> }<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> }<a name="line.226"></a> |
| <span class="sourceLineNo">227</span><a name="line.227"></a> |
| <span class="sourceLineNo">228</span> /**<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> * Verifies that the callback property, if provided, is purely alphanumeric. This prevents a<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> * malicious callback name (that is javascript code) from being returned by the UI to an<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> * unsuspecting user.<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> * @param callbackName The callback name, can be null.<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> * @return The callback name<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> * @throws IOException If the name is disallowed.<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> */<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> private String checkCallbackName(String callbackName) throws IOException {<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> if (null == callbackName) {<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> return null;<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> }<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> if (callbackName.matches("[A-Za-z0-9_]+")) {<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> return callbackName;<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> }<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> throw new IOException("'callback' must be alphanumeric");<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> }<a name="line.244"></a> |
| <span class="sourceLineNo">245</span>}<a name="line.245"></a> |
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| </pre> |
| </div> |
| </body> |
| </html> |
