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<pre><span class="sourceLineNo">001</span><a id="line.1">package org.apache.archiva.redback.common.config.acc2;</a>
<span class="sourceLineNo">002</span><a id="line.2"></a>
<span class="sourceLineNo">003</span><a id="line.3">/*</a>
<span class="sourceLineNo">004</span><a id="line.4"> * Licensed to the Apache Software Foundation (ASF) under one</a>
<span class="sourceLineNo">005</span><a id="line.5"> * or more contributor license agreements. See the NOTICE file</a>
<span class="sourceLineNo">006</span><a id="line.6"> * distributed with this work for additional information</a>
<span class="sourceLineNo">007</span><a id="line.7"> * regarding copyright ownership. The ASF licenses this file</a>
<span class="sourceLineNo">008</span><a id="line.8"> * to you under the Apache License, Version 2.0 (the</a>
<span class="sourceLineNo">009</span><a id="line.9"> * "License"); you may not use this file except in compliance</a>
<span class="sourceLineNo">010</span><a id="line.10"> * with the License. You may obtain a copy of the License at</a>
<span class="sourceLineNo">011</span><a id="line.11"> *</a>
<span class="sourceLineNo">012</span><a id="line.12"> * http://www.apache.org/licenses/LICENSE-2.0</a>
<span class="sourceLineNo">013</span><a id="line.13"> *</a>
<span class="sourceLineNo">014</span><a id="line.14"> * Unless required by applicable law or agreed to in writing,</a>
<span class="sourceLineNo">015</span><a id="line.15"> * software distributed under the License is distributed on an</a>
<span class="sourceLineNo">016</span><a id="line.16"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</a>
<span class="sourceLineNo">017</span><a id="line.17"> * KIND, either express or implied. See the License for the</a>
<span class="sourceLineNo">018</span><a id="line.18"> * specific language governing permissions and limitations</a>
<span class="sourceLineNo">019</span><a id="line.19"> * under the License.</a>
<span class="sourceLineNo">020</span><a id="line.20"> */</a>
<span class="sourceLineNo">021</span><a id="line.21"></a>
<span class="sourceLineNo">022</span><a id="line.22">import org.apache.archiva.redback.common.config.api.AsyncListener;</a>
<span class="sourceLineNo">023</span><a id="line.23">import org.apache.archiva.redback.common.config.api.ConfigRegistry;</a>
<span class="sourceLineNo">024</span><a id="line.24">import org.apache.archiva.redback.common.config.api.EventType;</a>
<span class="sourceLineNo">025</span><a id="line.25">import org.apache.archiva.redback.common.config.api.RegistryListener;</a>
<span class="sourceLineNo">026</span><a id="line.26">import org.apache.commons.configuration2.event.ConfigurationEvent;</a>
<span class="sourceLineNo">027</span><a id="line.27">import org.apache.commons.configuration2.event.Event;</a>
<span class="sourceLineNo">028</span><a id="line.28">import org.apache.commons.configuration2.event.EventListener;</a>
<span class="sourceLineNo">029</span><a id="line.29">import org.slf4j.Logger;</a>
<span class="sourceLineNo">030</span><a id="line.30">import org.slf4j.LoggerFactory;</a>
<span class="sourceLineNo">031</span><a id="line.31">import org.springframework.context.ApplicationContext;</a>
<span class="sourceLineNo">032</span><a id="line.32">import org.springframework.core.task.TaskExecutor;</a>
<span class="sourceLineNo">033</span><a id="line.33"></a>
<span class="sourceLineNo">034</span><a id="line.34">import java.util.Iterator;</a>
<span class="sourceLineNo">035</span><a id="line.35">import java.util.LinkedHashMap;</a>
<span class="sourceLineNo">036</span><a id="line.36">import java.util.Map;</a>
<span class="sourceLineNo">037</span><a id="line.37">import java.util.Objects;</a>
<span class="sourceLineNo">038</span><a id="line.38">import java.util.WeakHashMap;</a>
<span class="sourceLineNo">039</span><a id="line.39"></a>
<span class="sourceLineNo">040</span><a id="line.40">/**</a>
<span class="sourceLineNo">041</span><a id="line.41"> * This class maps apache commons configuration events into redback configuration events.</a>
<span class="sourceLineNo">042</span><a id="line.42"> *</a>
<span class="sourceLineNo">043</span><a id="line.43"> * @author Martin Stockhammer &lt;martin_s@apache.org&gt;</a>
<span class="sourceLineNo">044</span><a id="line.44"> */</a>
<span class="sourceLineNo">045</span><a id="line.45"></a>
<span class="sourceLineNo">046</span><a id="line.46">public class CfgListener implements EventListener</a>
<span class="sourceLineNo">047</span><a id="line.47">{</a>
<span class="sourceLineNo">048</span><a id="line.48"></a>
<span class="sourceLineNo">049</span><a id="line.49"> ConfigRegistry registry;</a>
<span class="sourceLineNo">050</span><a id="line.50"></a>
<span class="sourceLineNo">051</span><a id="line.51"> Map&lt;String, ListenerInfo&gt; listeners = new LinkedHashMap&lt;&gt;( );</a>
<span class="sourceLineNo">052</span><a id="line.52"> WeakHashMap&lt;EventInfo, Object&gt; oldValueStore = new WeakHashMap&lt;&gt;( );</a>
<span class="sourceLineNo">053</span><a id="line.53"></a>
<span class="sourceLineNo">054</span><a id="line.54"> Logger logger = LoggerFactory.getLogger( CfgListener.class );</a>
<span class="sourceLineNo">055</span><a id="line.55"></a>
<span class="sourceLineNo">056</span><a id="line.56"> CfgListener( ConfigRegistry registry )</a>
<span class="sourceLineNo">057</span><a id="line.57"> {</a>
<span class="sourceLineNo">058</span><a id="line.58"> this.registry = registry;</a>
<span class="sourceLineNo">059</span><a id="line.59"> }</a>
<span class="sourceLineNo">060</span><a id="line.60"></a>
<span class="sourceLineNo">061</span><a id="line.61"> TaskExecutor defaultExecutor;</a>
<span class="sourceLineNo">062</span><a id="line.62"></a>
<span class="sourceLineNo">063</span><a id="line.63"> ApplicationContext applicationContext;</a>
<span class="sourceLineNo">064</span><a id="line.64"></a>
<span class="sourceLineNo">065</span><a id="line.65"> private final class ListenerInfo</a>
<span class="sourceLineNo">066</span><a id="line.66"> {</a>
<span class="sourceLineNo">067</span><a id="line.67"> final String prefix;</a>
<span class="sourceLineNo">068</span><a id="line.68"> final RegistryListener listener;</a>
<span class="sourceLineNo">069</span><a id="line.69"> final boolean async;</a>
<span class="sourceLineNo">070</span><a id="line.70"> final TaskExecutor executor;</a>
<span class="sourceLineNo">071</span><a id="line.71"></a>
<span class="sourceLineNo">072</span><a id="line.72"> public ListenerInfo( String prefix, RegistryListener listener )</a>
<span class="sourceLineNo">073</span><a id="line.73"> {</a>
<span class="sourceLineNo">074</span><a id="line.74"> this.prefix = prefix;</a>
<span class="sourceLineNo">075</span><a id="line.75"> this.listener = listener;</a>
<span class="sourceLineNo">076</span><a id="line.76"> Class&lt;? extends RegistryListener&gt; clazz = listener.getClass( );</a>
<span class="sourceLineNo">077</span><a id="line.77"> boolean async = clazz.isAnnotationPresent( AsyncListener.class );</a>
<span class="sourceLineNo">078</span><a id="line.78"> try</a>
<span class="sourceLineNo">079</span><a id="line.79"> {</a>
<span class="sourceLineNo">080</span><a id="line.80"> AsyncListener classAnnotation = clazz.getAnnotation( AsyncListener.class );</a>
<span class="sourceLineNo">081</span><a id="line.81"> AsyncListener methodAnnotation = clazz.getMethod( "handleConfigurationChangeEvent", ConfigRegistry.class, EventType.class, String.class, Object.class, Object.class ).getAnnotation( AsyncListener.class );</a>
<span class="sourceLineNo">082</span><a id="line.82"> this.async = methodAnnotation != null || classAnnotation != null;</a>
<span class="sourceLineNo">083</span><a id="line.83"> String executorString = methodAnnotation != null ? methodAnnotation.value( ) : ( classAnnotation != null ? classAnnotation.value( ) : null );</a>
<span class="sourceLineNo">084</span><a id="line.84"> TaskExecutor newExec;</a>
<span class="sourceLineNo">085</span><a id="line.85"> if ( executorString == null )</a>
<span class="sourceLineNo">086</span><a id="line.86"> {</a>
<span class="sourceLineNo">087</span><a id="line.87"> newExec = defaultExecutor;</a>
<span class="sourceLineNo">088</span><a id="line.88"> }</a>
<span class="sourceLineNo">089</span><a id="line.89"> else</a>
<span class="sourceLineNo">090</span><a id="line.90"> {</a>
<span class="sourceLineNo">091</span><a id="line.91"> newExec = applicationContext.getBean( executorString, TaskExecutor.class );</a>
<span class="sourceLineNo">092</span><a id="line.92"> if ( newExec == null )</a>
<span class="sourceLineNo">093</span><a id="line.93"> {</a>
<span class="sourceLineNo">094</span><a id="line.94"> newExec = defaultExecutor;</a>
<span class="sourceLineNo">095</span><a id="line.95"> }</a>
<span class="sourceLineNo">096</span><a id="line.96"> }</a>
<span class="sourceLineNo">097</span><a id="line.97"> this.executor = newExec;</a>
<span class="sourceLineNo">098</span><a id="line.98"> }</a>
<span class="sourceLineNo">099</span><a id="line.99"> catch ( NoSuchMethodException e )</a>
<span class="sourceLineNo">100</span><a id="line.100"> {</a>
<span class="sourceLineNo">101</span><a id="line.101"> throw new RuntimeException( "Fatal error! EventListener methods not found. Maybe you have the wrong version of EventLister in your classpath." );</a>
<span class="sourceLineNo">102</span><a id="line.102"> }</a>
<span class="sourceLineNo">103</span><a id="line.103"> }</a>
<span class="sourceLineNo">104</span><a id="line.104"></a>
<span class="sourceLineNo">105</span><a id="line.105"> }</a>
<span class="sourceLineNo">106</span><a id="line.106"></a>
<span class="sourceLineNo">107</span><a id="line.107"></a>
<span class="sourceLineNo">108</span><a id="line.108"> private final class EventInfo</a>
<span class="sourceLineNo">109</span><a id="line.109"> {</a>
<span class="sourceLineNo">110</span><a id="line.110"> final org.apache.commons.configuration2.event.EventType type;</a>
<span class="sourceLineNo">111</span><a id="line.111"> final String name;</a>
<span class="sourceLineNo">112</span><a id="line.112"> final Object value;</a>
<span class="sourceLineNo">113</span><a id="line.113"></a>
<span class="sourceLineNo">114</span><a id="line.114"> EventInfo( org.apache.commons.configuration2.event.EventType type, String name, Object value )</a>
<span class="sourceLineNo">115</span><a id="line.115"> {</a>
<span class="sourceLineNo">116</span><a id="line.116"> this.type = type;</a>
<span class="sourceLineNo">117</span><a id="line.117"> this.name = name;</a>
<span class="sourceLineNo">118</span><a id="line.118"> this.value = value;</a>
<span class="sourceLineNo">119</span><a id="line.119"> }</a>
<span class="sourceLineNo">120</span><a id="line.120"></a>
<span class="sourceLineNo">121</span><a id="line.121"> @Override</a>
<span class="sourceLineNo">122</span><a id="line.122"> public int hashCode( )</a>
<span class="sourceLineNo">123</span><a id="line.123"> {</a>
<span class="sourceLineNo">124</span><a id="line.124"> return Objects.hash( type, name, value );</a>
<span class="sourceLineNo">125</span><a id="line.125"> }</a>
<span class="sourceLineNo">126</span><a id="line.126"></a>
<span class="sourceLineNo">127</span><a id="line.127"> public boolean equals( EventInfo obj )</a>
<span class="sourceLineNo">128</span><a id="line.128"> {</a>
<span class="sourceLineNo">129</span><a id="line.129"> return Objects.equals( this.type, obj.type ) &amp;&amp; Objects.equals( this.name, obj.name ) &amp;&amp; Objects.equals( this.value, obj.value );</a>
<span class="sourceLineNo">130</span><a id="line.130"> }</a>
<span class="sourceLineNo">131</span><a id="line.131"></a>
<span class="sourceLineNo">132</span><a id="line.132"> }</a>
<span class="sourceLineNo">133</span><a id="line.133"></a>
<span class="sourceLineNo">134</span><a id="line.134"> /**</a>
<span class="sourceLineNo">135</span><a id="line.135"> * This method stores old values in the</a>
<span class="sourceLineNo">136</span><a id="line.136"> * @param event</a>
<span class="sourceLineNo">137</span><a id="line.137"> */</a>
<span class="sourceLineNo">138</span><a id="line.138"> public void onEvent( org.apache.commons.configuration2.event.ConfigurationEvent event )</a>
<span class="sourceLineNo">139</span><a id="line.139"> {</a>
<span class="sourceLineNo">140</span><a id="line.140"> logger.debug( "Event " + event.getClass( ).getName( ) + " Source Class: " + event.getSource( ).getClass( ).getName( ) );</a>
<span class="sourceLineNo">141</span><a id="line.141"> logger.debug( "EventType " + event.getEventType( ) + ", EventProperty: " + event.getPropertyName( ) + ", EventValue: " + event.getPropertyValue( ) );</a>
<span class="sourceLineNo">142</span><a id="line.142"> if ( event.isBeforeUpdate( ) )</a>
<span class="sourceLineNo">143</span><a id="line.143"> {</a>
<span class="sourceLineNo">144</span><a id="line.144"> logger.debug( "Event before update" );</a>
<span class="sourceLineNo">145</span><a id="line.145"> Object oldValue = registry.getValue( event.getPropertyName( ) );</a>
<span class="sourceLineNo">146</span><a id="line.146"> oldValueStore.put( new EventInfo( event.getEventType( ), event.getPropertyName( ), event.getPropertyValue( ) ), oldValue );</a>
<span class="sourceLineNo">147</span><a id="line.147"> }</a>
<span class="sourceLineNo">148</span><a id="line.148"> else</a>
<span class="sourceLineNo">149</span><a id="line.149"> {</a>
<span class="sourceLineNo">150</span><a id="line.150"> logger.debug( "Event after update" );</a>
<span class="sourceLineNo">151</span><a id="line.151"> final EventType type = transformEventType( event.getEventType( ) );</a>
<span class="sourceLineNo">152</span><a id="line.152"> final Object oldValue = oldValueStore.remove( new EventInfo( event.getEventType( ), event.getPropertyName( ), event.getPropertyValue( ) ) );</a>
<span class="sourceLineNo">153</span><a id="line.153"> final String propertyName = event.getPropertyName();</a>
<span class="sourceLineNo">154</span><a id="line.154"> final Object newValue = event.getPropertyValue();</a>
<span class="sourceLineNo">155</span><a id="line.155"> listeners.entrySet( ).stream( ).filter( entry -&gt; event.getPropertyName( ).startsWith( entry.getKey( ) ) ).forEach(</a>
<span class="sourceLineNo">156</span><a id="line.156"> entry -&gt;</a>
<span class="sourceLineNo">157</span><a id="line.157"> callListener( entry.getValue(), type, propertyName, newValue, oldValue )</a>
<span class="sourceLineNo">158</span><a id="line.158"></a>
<span class="sourceLineNo">159</span><a id="line.159"> );</a>
<span class="sourceLineNo">160</span><a id="line.160"> }</a>
<span class="sourceLineNo">161</span><a id="line.161"></a>
<span class="sourceLineNo">162</span><a id="line.162"> }</a>
<span class="sourceLineNo">163</span><a id="line.163"></a>
<span class="sourceLineNo">164</span><a id="line.164"> private void callListener(ListenerInfo li, EventType type, String propertyName, Object newValue, Object oldValue) {</a>
<span class="sourceLineNo">165</span><a id="line.165"> try</a>
<span class="sourceLineNo">166</span><a id="line.166"> {</a>
<span class="sourceLineNo">167</span><a id="line.167"> if ( li.async )</a>
<span class="sourceLineNo">168</span><a id="line.168"> {</a>
<span class="sourceLineNo">169</span><a id="line.169"> li.executor.execute( ( ) -&gt; li.listener.handleConfigurationChangeEvent( registry, type, propertyName, newValue, oldValue ) );</a>
<span class="sourceLineNo">170</span><a id="line.170"> }</a>
<span class="sourceLineNo">171</span><a id="line.171"> else</a>
<span class="sourceLineNo">172</span><a id="line.172"> {</a>
<span class="sourceLineNo">173</span><a id="line.173"> li.listener.handleConfigurationChangeEvent( registry, type, propertyName, newValue, oldValue );</a>
<span class="sourceLineNo">174</span><a id="line.174"> }</a>
<span class="sourceLineNo">175</span><a id="line.175"> } catch (Throwable ex) {</a>
<span class="sourceLineNo">176</span><a id="line.176"> logger.error( "Listener exception occured: "+ex.getMessage(), ex);</a>
<span class="sourceLineNo">177</span><a id="line.177"> // Exception is catched allow to call the other listeners.</a>
<span class="sourceLineNo">178</span><a id="line.178"> }</a>
<span class="sourceLineNo">179</span><a id="line.179"> }</a>
<span class="sourceLineNo">180</span><a id="line.180"></a>
<span class="sourceLineNo">181</span><a id="line.181"> private EventType transformEventType( org.apache.commons.configuration2.event.EventType&lt;? extends Event&gt; type )</a>
<span class="sourceLineNo">182</span><a id="line.182"> {</a>
<span class="sourceLineNo">183</span><a id="line.183"></a>
<span class="sourceLineNo">184</span><a id="line.184"> if ( type.equals( ConfigurationEvent.ADD_PROPERTY ) )</a>
<span class="sourceLineNo">185</span><a id="line.185"> {</a>
<span class="sourceLineNo">186</span><a id="line.186"> return EventType.PROPERTY_ADDED;</a>
<span class="sourceLineNo">187</span><a id="line.187"> }</a>
<span class="sourceLineNo">188</span><a id="line.188"> else if ( type.equals( ConfigurationEvent.CLEAR_PROPERTY ) )</a>
<span class="sourceLineNo">189</span><a id="line.189"> {</a>
<span class="sourceLineNo">190</span><a id="line.190"> return EventType.PROPERTY_CLEARED;</a>
<span class="sourceLineNo">191</span><a id="line.191"> }</a>
<span class="sourceLineNo">192</span><a id="line.192"> else if ( type.equals( ConfigurationEvent.SET_PROPERTY ) )</a>
<span class="sourceLineNo">193</span><a id="line.193"> {</a>
<span class="sourceLineNo">194</span><a id="line.194"> return EventType.PROPERTY_SET;</a>
<span class="sourceLineNo">195</span><a id="line.195"> }</a>
<span class="sourceLineNo">196</span><a id="line.196"> else</a>
<span class="sourceLineNo">197</span><a id="line.197"> {</a>
<span class="sourceLineNo">198</span><a id="line.198"> return EventType.UNDEFINED;</a>
<span class="sourceLineNo">199</span><a id="line.199"> }</a>
<span class="sourceLineNo">200</span><a id="line.200"> }</a>
<span class="sourceLineNo">201</span><a id="line.201"></a>
<span class="sourceLineNo">202</span><a id="line.202"> @Override</a>
<span class="sourceLineNo">203</span><a id="line.203"> public void onEvent( Event event )</a>
<span class="sourceLineNo">204</span><a id="line.204"> {</a>
<span class="sourceLineNo">205</span><a id="line.205"> if ( event instanceof ConfigurationEvent )</a>
<span class="sourceLineNo">206</span><a id="line.206"> {</a>
<span class="sourceLineNo">207</span><a id="line.207"> onEvent( (ConfigurationEvent) event );</a>
<span class="sourceLineNo">208</span><a id="line.208"> }</a>
<span class="sourceLineNo">209</span><a id="line.209"> else</a>
<span class="sourceLineNo">210</span><a id="line.210"> {</a>
<span class="sourceLineNo">211</span><a id="line.211"> logger.debug( "Event " + event.getClass( ).getName( ) + " Source Class: " + event.getSource( ).getClass( ).getName( ) );</a>
<span class="sourceLineNo">212</span><a id="line.212"> logger.debug( "EventType " + event.getEventType( ) );</a>
<span class="sourceLineNo">213</span><a id="line.213"> }</a>
<span class="sourceLineNo">214</span><a id="line.214"> }</a>
<span class="sourceLineNo">215</span><a id="line.215"></a>
<span class="sourceLineNo">216</span><a id="line.216"> public void registerChangeListener( RegistryListener listener, String prefix )</a>
<span class="sourceLineNo">217</span><a id="line.217"> {</a>
<span class="sourceLineNo">218</span><a id="line.218"> listeners.put( prefix, new ListenerInfo( prefix, listener ) );</a>
<span class="sourceLineNo">219</span><a id="line.219"> }</a>
<span class="sourceLineNo">220</span><a id="line.220"></a>
<span class="sourceLineNo">221</span><a id="line.221"> public boolean unregisterChangeListener( RegistryListener listener )</a>
<span class="sourceLineNo">222</span><a id="line.222"> {</a>
<span class="sourceLineNo">223</span><a id="line.223"> boolean found = false;</a>
<span class="sourceLineNo">224</span><a id="line.224"> Iterator&lt;Map.Entry&lt;String, ListenerInfo&gt;&gt; it = listeners.entrySet( ).iterator( );</a>
<span class="sourceLineNo">225</span><a id="line.225"> while ( it.hasNext( ) )</a>
<span class="sourceLineNo">226</span><a id="line.226"> {</a>
<span class="sourceLineNo">227</span><a id="line.227"> Map.Entry&lt;String, ListenerInfo&gt; e = it.next( );</a>
<span class="sourceLineNo">228</span><a id="line.228"> if ( e.getValue( ).listener == listener )</a>
<span class="sourceLineNo">229</span><a id="line.229"> {</a>
<span class="sourceLineNo">230</span><a id="line.230"> it.remove( );</a>
<span class="sourceLineNo">231</span><a id="line.231"> found = true;</a>
<span class="sourceLineNo">232</span><a id="line.232"> }</a>
<span class="sourceLineNo">233</span><a id="line.233"> }</a>
<span class="sourceLineNo">234</span><a id="line.234"> return found;</a>
<span class="sourceLineNo">235</span><a id="line.235"> }</a>
<span class="sourceLineNo">236</span><a id="line.236"></a>
<span class="sourceLineNo">237</span><a id="line.237"> public TaskExecutor getDefaultExecutor( )</a>
<span class="sourceLineNo">238</span><a id="line.238"> {</a>
<span class="sourceLineNo">239</span><a id="line.239"> return defaultExecutor;</a>
<span class="sourceLineNo">240</span><a id="line.240"> }</a>
<span class="sourceLineNo">241</span><a id="line.241"></a>
<span class="sourceLineNo">242</span><a id="line.242"> public void setDefaultExecutor( TaskExecutor defaultExecutor )</a>
<span class="sourceLineNo">243</span><a id="line.243"> {</a>
<span class="sourceLineNo">244</span><a id="line.244"> this.defaultExecutor = defaultExecutor;</a>
<span class="sourceLineNo">245</span><a id="line.245"> }</a>
<span class="sourceLineNo">246</span><a id="line.246"></a>
<span class="sourceLineNo">247</span><a id="line.247"></a>
<span class="sourceLineNo">248</span><a id="line.248"> public ApplicationContext getApplicationContext( )</a>
<span class="sourceLineNo">249</span><a id="line.249"> {</a>
<span class="sourceLineNo">250</span><a id="line.250"> return applicationContext;</a>
<span class="sourceLineNo">251</span><a id="line.251"> }</a>
<span class="sourceLineNo">252</span><a id="line.252"></a>
<span class="sourceLineNo">253</span><a id="line.253"> public void setApplicationContext( ApplicationContext applicationContext )</a>
<span class="sourceLineNo">254</span><a id="line.254"> {</a>
<span class="sourceLineNo">255</span><a id="line.255"> this.applicationContext = applicationContext;</a>
<span class="sourceLineNo">256</span><a id="line.256"> }</a>
<span class="sourceLineNo">257</span><a id="line.257">}</a>
</pre>
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