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