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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache license, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License. You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the license for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the license.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.logging.log4j.core.selector;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import org.apache.logging.log4j.core.LoggerContext;<a name="line.19"></a>
<FONT color="green">020</FONT>    import org.apache.logging.log4j.core.helpers.Constants;<a name="line.20"></a>
<FONT color="green">021</FONT>    import org.apache.logging.log4j.core.javaee.ContextAnchor;<a name="line.21"></a>
<FONT color="green">022</FONT>    import org.apache.logging.log4j.status.StatusLogger;<a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>    import javax.naming.Context;<a name="line.24"></a>
<FONT color="green">025</FONT>    import javax.naming.InitialContext;<a name="line.25"></a>
<FONT color="green">026</FONT>    import javax.naming.NameNotFoundException;<a name="line.26"></a>
<FONT color="green">027</FONT>    import javax.naming.NamingException;<a name="line.27"></a>
<FONT color="green">028</FONT>    import java.util.ArrayList;<a name="line.28"></a>
<FONT color="green">029</FONT>    import java.util.Collections;<a name="line.29"></a>
<FONT color="green">030</FONT>    import java.util.List;<a name="line.30"></a>
<FONT color="green">031</FONT>    import java.util.Map;<a name="line.31"></a>
<FONT color="green">032</FONT>    import java.util.concurrent.ConcurrentHashMap;<a name="line.32"></a>
<FONT color="green">033</FONT>    import java.util.concurrent.ConcurrentMap;<a name="line.33"></a>
<FONT color="green">034</FONT>    <a name="line.34"></a>
<FONT color="green">035</FONT>    /**<a name="line.35"></a>
<FONT color="green">036</FONT>     * This class can be used to define a<a name="line.36"></a>
<FONT color="green">037</FONT>     * custom logger repository.  It makes use of the fact that in J2EE<a name="line.37"></a>
<FONT color="green">038</FONT>     * environments, each web-application is guaranteed to have its own JNDI<a name="line.38"></a>
<FONT color="green">039</FONT>     * context relative to the &lt;code&gt;java:comp/env&lt;/code&gt; context. In EJBs, each<a name="line.39"></a>
<FONT color="green">040</FONT>     * enterprise bean (albeit not each application) has its own context relative<a name="line.40"></a>
<FONT color="green">041</FONT>     * to the &lt;code&gt;java:comp/env&lt;/code&gt; context.  An &lt;code&gt;env-entry&lt;/code&gt; in a<a name="line.41"></a>
<FONT color="green">042</FONT>     * deployment descriptor provides the information to the JNDI context.  Once the<a name="line.42"></a>
<FONT color="green">043</FONT>     * &lt;code&gt;env-entry&lt;/code&gt; is set, a repository selector can query the JNDI<a name="line.43"></a>
<FONT color="green">044</FONT>     * application context to look up the value of the entry. The logging context of<a name="line.44"></a>
<FONT color="green">045</FONT>     * the web-application will depend on the value the env-entry.  The JNDI context<a name="line.45"></a>
<FONT color="green">046</FONT>     *  which is looked up by this class is<a name="line.46"></a>
<FONT color="green">047</FONT>     * &lt;code&gt;java:comp/env/log4j/context-name&lt;/code&gt;.<a name="line.47"></a>
<FONT color="green">048</FONT>     *<a name="line.48"></a>
<FONT color="green">049</FONT>     * &lt;p&gt;Here is an example of an &lt;code&gt;env-entry&lt;code&gt;:<a name="line.49"></a>
<FONT color="green">050</FONT>     * &lt;blockquote&gt;<a name="line.50"></a>
<FONT color="green">051</FONT>     * &lt;pre&gt;<a name="line.51"></a>
<FONT color="green">052</FONT>     * &amp;lt;env-entry&amp;gt;<a name="line.52"></a>
<FONT color="green">053</FONT>     *   &amp;lt;description&amp;gt;JNDI logging context name for this app&amp;lt;/description&amp;gt;<a name="line.53"></a>
<FONT color="green">054</FONT>     *   &amp;lt;env-entry-name&amp;gt;log4j/context-name&amp;lt;/env-entry-name&amp;gt;<a name="line.54"></a>
<FONT color="green">055</FONT>     *   &amp;lt;env-entry-value&amp;gt;aDistinctiveLoggingContextName&amp;lt;/env-entry-value&amp;gt;<a name="line.55"></a>
<FONT color="green">056</FONT>     *   &amp;lt;env-entry-type&amp;gt;java.lang.String&amp;lt;/env-entry-type&amp;gt;<a name="line.56"></a>
<FONT color="green">057</FONT>     * &amp;lt;/env-entry&amp;gt;<a name="line.57"></a>
<FONT color="green">058</FONT>     * &lt;/pre&gt;<a name="line.58"></a>
<FONT color="green">059</FONT>     * &lt;/blockquote&gt;<a name="line.59"></a>
<FONT color="green">060</FONT>     * &lt;/p&gt;<a name="line.60"></a>
<FONT color="green">061</FONT>     *<a name="line.61"></a>
<FONT color="green">062</FONT>     * &lt;p&gt;&lt;em&gt;If multiple applications use the same logging context name, then they<a name="line.62"></a>
<FONT color="green">063</FONT>     * will share the same logging context.&lt;/em&gt;<a name="line.63"></a>
<FONT color="green">064</FONT>     * &lt;/p&gt;<a name="line.64"></a>
<FONT color="green">065</FONT>     *<a name="line.65"></a>
<FONT color="green">066</FONT>     *&lt;p&gt;You can also specify the URL for this context's configuration resource.<a name="line.66"></a>
<FONT color="green">067</FONT>     * This repository selector (ContextJNDISelector) will use this resource<a name="line.67"></a>
<FONT color="green">068</FONT>     * to automatically configure the log4j repository.<a name="line.68"></a>
<FONT color="green">069</FONT>     *&lt;/p&gt;<a name="line.69"></a>
<FONT color="green">070</FONT>     ** &lt;blockquote&gt;<a name="line.70"></a>
<FONT color="green">071</FONT>     * &lt;pre&gt;<a name="line.71"></a>
<FONT color="green">072</FONT>     * &amp;lt;env-entry&amp;gt;<a name="line.72"></a>
<FONT color="green">073</FONT>     *   &amp;lt;description&amp;gt;URL for configuring log4j context&amp;lt;/description&amp;gt;<a name="line.73"></a>
<FONT color="green">074</FONT>     *   &amp;lt;env-entry-name&amp;gt;log4j/configuration-resource&amp;lt;/env-entry-name&amp;gt;<a name="line.74"></a>
<FONT color="green">075</FONT>     *   &amp;lt;env-entry-value&amp;gt;urlOfConfigrationResource&amp;lt;/env-entry-value&amp;gt;<a name="line.75"></a>
<FONT color="green">076</FONT>     *   &amp;lt;env-entry-type&amp;gt;java.lang.String&amp;lt;/env-entry-type&amp;gt;<a name="line.76"></a>
<FONT color="green">077</FONT>     * &amp;lt;/env-entry&amp;gt;<a name="line.77"></a>
<FONT color="green">078</FONT>     * &lt;/pre&gt;<a name="line.78"></a>
<FONT color="green">079</FONT>     * &lt;/blockquote&gt;<a name="line.79"></a>
<FONT color="green">080</FONT>     *<a name="line.80"></a>
<FONT color="green">081</FONT>     * &lt;p&gt;It usually good practice for configuration resources of distinct<a name="line.81"></a>
<FONT color="green">082</FONT>     * applications to have distinct names. However, if this is not possible<a name="line.82"></a>
<FONT color="green">083</FONT>     * Naming<a name="line.83"></a>
<FONT color="green">084</FONT>     * &lt;/p&gt;<a name="line.84"></a>
<FONT color="green">085</FONT>     *<a name="line.85"></a>
<FONT color="green">086</FONT>     */<a name="line.86"></a>
<FONT color="green">087</FONT>    public class JNDIContextSelector implements NamedContextSelector {<a name="line.87"></a>
<FONT color="green">088</FONT>    <a name="line.88"></a>
<FONT color="green">089</FONT>        private static LoggerContext context = new LoggerContext("Default");<a name="line.89"></a>
<FONT color="green">090</FONT>    <a name="line.90"></a>
<FONT color="green">091</FONT>        private static ConcurrentMap&lt;String, LoggerContext&gt; contextMap =<a name="line.91"></a>
<FONT color="green">092</FONT>            new ConcurrentHashMap&lt;String, LoggerContext&gt;();<a name="line.92"></a>
<FONT color="green">093</FONT>    <a name="line.93"></a>
<FONT color="green">094</FONT>        private static final StatusLogger LOGGER = StatusLogger.getLogger();<a name="line.94"></a>
<FONT color="green">095</FONT>    <a name="line.95"></a>
<FONT color="green">096</FONT>        public LoggerContext getContext(String fqcn, boolean currentContext) {<a name="line.96"></a>
<FONT color="green">097</FONT>    <a name="line.97"></a>
<FONT color="green">098</FONT>            LoggerContext lc = ContextAnchor.THREAD_CONTEXT.get();<a name="line.98"></a>
<FONT color="green">099</FONT>            if (lc != null) {<a name="line.99"></a>
<FONT color="green">100</FONT>                return lc;<a name="line.100"></a>
<FONT color="green">101</FONT>            }<a name="line.101"></a>
<FONT color="green">102</FONT>    <a name="line.102"></a>
<FONT color="green">103</FONT>            String loggingContextName = null;<a name="line.103"></a>
<FONT color="green">104</FONT>    <a name="line.104"></a>
<FONT color="green">105</FONT>            try {<a name="line.105"></a>
<FONT color="green">106</FONT>                Context ctx = new InitialContext();<a name="line.106"></a>
<FONT color="green">107</FONT>                loggingContextName = (String) lookup(ctx, Constants.JNDI_CONTEXT_NAME);<a name="line.107"></a>
<FONT color="green">108</FONT>            } catch (NamingException ne) {<a name="line.108"></a>
<FONT color="green">109</FONT>                LOGGER.error("Unable to lookup " + Constants.JNDI_CONTEXT_NAME, ne);<a name="line.109"></a>
<FONT color="green">110</FONT>            }<a name="line.110"></a>
<FONT color="green">111</FONT>    <a name="line.111"></a>
<FONT color="green">112</FONT>            return loggingContextName == null ? context : locateContext(loggingContextName, null);<a name="line.112"></a>
<FONT color="green">113</FONT>        }<a name="line.113"></a>
<FONT color="green">114</FONT>    <a name="line.114"></a>
<FONT color="green">115</FONT>        public LoggerContext locateContext(String name, String configLocation) {<a name="line.115"></a>
<FONT color="green">116</FONT>            if (name == null) {<a name="line.116"></a>
<FONT color="green">117</FONT>                LOGGER.error("A context name is required to locate a LoggerContext");<a name="line.117"></a>
<FONT color="green">118</FONT>                return null;<a name="line.118"></a>
<FONT color="green">119</FONT>            }<a name="line.119"></a>
<FONT color="green">120</FONT>            if (!contextMap.containsKey(name)) {<a name="line.120"></a>
<FONT color="green">121</FONT>                LoggerContext ctx = new LoggerContext(name, null, configLocation);<a name="line.121"></a>
<FONT color="green">122</FONT>                contextMap.putIfAbsent(name, ctx);<a name="line.122"></a>
<FONT color="green">123</FONT>            }<a name="line.123"></a>
<FONT color="green">124</FONT>            return contextMap.get(name);<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 void removeContext(LoggerContext context) {<a name="line.127"></a>
<FONT color="green">128</FONT>    <a name="line.128"></a>
<FONT color="green">129</FONT>            for (Map.Entry&lt;String, LoggerContext&gt; entry : contextMap.entrySet()) {<a name="line.129"></a>
<FONT color="green">130</FONT>                if (entry.getValue().equals(context)) {<a name="line.130"></a>
<FONT color="green">131</FONT>                    contextMap.remove(entry.getKey());<a name="line.131"></a>
<FONT color="green">132</FONT>                }<a name="line.132"></a>
<FONT color="green">133</FONT>            }<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>        public LoggerContext removeContext(String name) {<a name="line.136"></a>
<FONT color="green">137</FONT>            return contextMap.remove(name);<a name="line.137"></a>
<FONT color="green">138</FONT>        }<a name="line.138"></a>
<FONT color="green">139</FONT>    <a name="line.139"></a>
<FONT color="green">140</FONT>        public List&lt;LoggerContext&gt; getLoggerContexts() {<a name="line.140"></a>
<FONT color="green">141</FONT>            List&lt;LoggerContext&gt; list = new ArrayList&lt;LoggerContext&gt;(contextMap.values());<a name="line.141"></a>
<FONT color="green">142</FONT>            return Collections.unmodifiableList(list);<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>        protected static Object lookup(Context ctx, String name) throws NamingException {<a name="line.146"></a>
<FONT color="green">147</FONT>            if (ctx == null) {<a name="line.147"></a>
<FONT color="green">148</FONT>                return null;<a name="line.148"></a>
<FONT color="green">149</FONT>            }<a name="line.149"></a>
<FONT color="green">150</FONT>            try {<a name="line.150"></a>
<FONT color="green">151</FONT>                return ctx.lookup(name);<a name="line.151"></a>
<FONT color="green">152</FONT>            } catch (NameNotFoundException e) {<a name="line.152"></a>
<FONT color="green">153</FONT>                LOGGER.error("Could not find name [" + name + "].");<a name="line.153"></a>
<FONT color="green">154</FONT>                throw e;<a name="line.154"></a>
<FONT color="green">155</FONT>            }<a name="line.155"></a>
<FONT color="green">156</FONT>        }<a name="line.156"></a>
<FONT color="green">157</FONT>    }<a name="line.157"></a>


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