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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 or more<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache license, Version 2.0<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * the License. You may obtain a copy of the License at<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> *<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * See the license for the specific language governing permissions and<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * limitations under the license.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> */<a name="line.16"></a> |
| <span class="sourceLineNo">017</span>package org.apache.log4j.spi;<a name="line.17"></a> |
| <span class="sourceLineNo">018</span><a name="line.18"></a> |
| <span class="sourceLineNo">019</span>import org.apache.log4j.Appender;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import org.apache.log4j.Logger;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span><a name="line.21"></a> |
| <span class="sourceLineNo">022</span><a name="line.22"></a> |
| <span class="sourceLineNo">023</span>/**<a name="line.23"></a> |
| <span class="sourceLineNo">024</span> * Appenders may delegate their error handling to<a name="line.24"></a> |
| <span class="sourceLineNo">025</span> * <code>ErrorHandlers</code>.<a name="line.25"></a> |
| <span class="sourceLineNo">026</span> * <p><a name="line.26"></a> |
| <span class="sourceLineNo">027</span> * Error handling is a particularly tedious to get right because by<a name="line.27"></a> |
| <span class="sourceLineNo">028</span> * definition errors are hard to predict and to reproduce.<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * </p><a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * <p><a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * Please take the time to contact the author in case you discover<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> * that errors are not properly handled. You are most welcome to<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * suggest new error handling policies or criticize existing policies.<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * </p><a name="line.34"></a> |
| <span class="sourceLineNo">035</span> */<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>public interface ErrorHandler {<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> * Add a reference to a logger to which the failing appender might<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * be attached to. The failing appender will be searched and<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * replaced only in the loggers you add through this method.<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> *<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * @param logger One of the loggers that will be searched for the failing<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * appender in view of replacement.<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * @since 1.2<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> */<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> void setLogger(Logger logger);<a name="line.47"></a> |
| <span class="sourceLineNo">048</span><a name="line.48"></a> |
| <span class="sourceLineNo">049</span><a name="line.49"></a> |
| <span class="sourceLineNo">050</span> /**<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> * Equivalent to the {@link #error(String, Exception, int,<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * LoggingEvent)} with the the event parameter set to<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> * <code>null</code>.<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> *<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> * @param message The message associated with the error.<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> * @param e The Exception that was thrown when the error occurred.<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> * @param errorCode The error code associated with the error.<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> */<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> void error(String message, Exception e, int errorCode);<a name="line.59"></a> |
| <span class="sourceLineNo">060</span><a name="line.60"></a> |
| <span class="sourceLineNo">061</span> /**<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> * This method is normally used to just print the error message<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> * passed as a parameter.<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> *<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * @param message The message associated with the error.<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> */<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> void error(String message);<a name="line.67"></a> |
| <span class="sourceLineNo">068</span><a name="line.68"></a> |
| <span class="sourceLineNo">069</span> /**<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> * This method is invoked to handle the error.<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> *<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> * @param message The message associated with the error.<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> * @param e The Exception that was thrown when the error occurred.<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> * @param errorCode The error code associated with the error.<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> * @param event The logging event that the failing appender is asked<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> * to log.<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> * @since 1.2<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> */<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> void error(String message, Exception e, int errorCode, LoggingEvent event);<a name="line.79"></a> |
| <span class="sourceLineNo">080</span><a name="line.80"></a> |
| <span class="sourceLineNo">081</span> /**<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> * Set the appender for which errors are handled. This method is<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> * usually called when the error handler is configured.<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> *<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> * @param appender The appender<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> * @since 1.2<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> */<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> void setAppender(Appender appender);<a name="line.88"></a> |
| <span class="sourceLineNo">089</span><a name="line.89"></a> |
| <span class="sourceLineNo">090</span> /**<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> * Set the appender to fallback upon in case of failure.<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> *<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> * @param appender The backup appender<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> * @since 1.2<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> */<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> void setBackupAppender(Appender appender);<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> |
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