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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.logging.log4j.core;<a name="line.17"></a> |
| <span class="sourceLineNo">018</span><a name="line.18"></a> |
| <span class="sourceLineNo">019</span>import java.io.Serializable;<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> * Appends {@link LogEvent}s. An Appender can contain a {@link Layout} if applicable as well<a name="line.22"></a> |
| <span class="sourceLineNo">023</span> * as an {@link ErrorHandler}. Typical Appender implementations coordinate with an<a name="line.23"></a> |
| <span class="sourceLineNo">024</span> * implementation of {@link org.apache.logging.log4j.core.appender.AbstractManager} to handle external resources<a name="line.24"></a> |
| <span class="sourceLineNo">025</span> * such as streams, connections, and other shared state. As Appenders are plugins, concrete implementations need to<a name="line.25"></a> |
| <span class="sourceLineNo">026</span> * be annotated with {@link org.apache.logging.log4j.core.config.plugins.Plugin} and need to provide a static<a name="line.26"></a> |
| <span class="sourceLineNo">027</span> * factory method annotated with {@link org.apache.logging.log4j.core.config.plugins.PluginFactory}.<a name="line.27"></a> |
| <span class="sourceLineNo">028</span> *<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * <p>Most core plugins are written using a related Manager class that handle the actual task of serializing a<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * {@link LogEvent} to some output location. For instance, many Appenders can take<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * advantage of the {@link org.apache.logging.log4j.core.appender.OutputStreamManager} class.</p><a name="line.31"></a> |
| <span class="sourceLineNo">032</span> *<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * <p>It is recommended that Appenders don't do any heavy lifting since there can be many instances of the class<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * being used at any given time. When resources require locking (e.g., through {@link java.nio.channels.FileLock}),<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * it is important to isolate synchronized code to prevent concurrency issues.</p><a name="line.35"></a> |
| <span class="sourceLineNo">036</span> */<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>public interface Appender extends LifeCycle {<a name="line.37"></a> |
| <span class="sourceLineNo">038</span><a name="line.38"></a> |
| <span class="sourceLineNo">039</span> /**<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * Main {@linkplain org.apache.logging.log4j.core.config.plugins.Plugin#elementType() plugin element type} for<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * Appender plugins.<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> *<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * @since 2.6<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> */<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> String ELEMENT_TYPE = "appender";<a name="line.45"></a> |
| <span class="sourceLineNo">046</span><a name="line.46"></a> |
| <span class="sourceLineNo">047</span> /**<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> * Logs a LogEvent using whatever logic this Appender wishes to use. It is typically recommended to use a<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> * bridge pattern not only for the benefits from decoupling an Appender from its implementation, but it is also<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> * handy for sharing resources which may require some form of locking.<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> *<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * @param event The LogEvent.<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> */<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> void append(LogEvent event);<a name="line.54"></a> |
| <span class="sourceLineNo">055</span><a name="line.55"></a> |
| <span class="sourceLineNo">056</span><a name="line.56"></a> |
| <span class="sourceLineNo">057</span> /**<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * Gets the name of this Appender.<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> *<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * @return name, may be null.<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> */<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> String getName();<a name="line.62"></a> |
| <span class="sourceLineNo">063</span><a name="line.63"></a> |
| <span class="sourceLineNo">064</span> /**<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * Returns the Layout used by this Appender if applicable.<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> *<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * @return the Layout for this Appender or {@code null} if none is configured.<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> */<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> Layout<? extends Serializable> getLayout();<a name="line.69"></a> |
| <span class="sourceLineNo">070</span><a name="line.70"></a> |
| <span class="sourceLineNo">071</span> /**<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> * Some Appenders need to propagate exceptions back to the application. When {@code ignoreExceptions} is<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> * {@code false} the AppenderControl will allow the exception to percolate.<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> *<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> * @return {@code true} if exceptions will be logged but not thrown, {@code false} otherwise.<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> */<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> boolean ignoreExceptions();<a name="line.77"></a> |
| <span class="sourceLineNo">078</span><a name="line.78"></a> |
| <span class="sourceLineNo">079</span> /**<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * Gets the {@link ErrorHandler} used for handling exceptions.<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> *<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> * @return the ErrorHandler for handling exceptions.<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> */<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> ErrorHandler getHandler();<a name="line.84"></a> |
| <span class="sourceLineNo">085</span><a name="line.85"></a> |
| <span class="sourceLineNo">086</span> /**<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> * Sets the {@link ErrorHandler} used for handling exceptions.<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> *<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> * @param handler the ErrorHandler to use for handling exceptions.<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> */<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> void setHandler(ErrorHandler handler);<a name="line.91"></a> |
| <span class="sourceLineNo">092</span>}<a name="line.92"></a> |
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