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apache / logging-log4j-site / 9755b12b39efbc0142688f9b1a11ec68db89f97b / . / 2.13.0 / log4j-core / xref / org / apache / logging / log4j / core / Appender.html
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<a class="jxr_linenumber" name="L1" href="#L1">1</a> <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="L2" href="#L2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
<a class="jxr_linenumber" name="L3" href="#L3">3</a> <em class="jxr_comment"> * contributor license agreements. See the NOTICE file distributed with</em>
<a class="jxr_linenumber" name="L4" href="#L4">4</a> <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
<a class="jxr_linenumber" name="L5" href="#L5">5</a> <em class="jxr_comment"> * The ASF licenses this file to You under the Apache license, Version 2.0</em>
<a class="jxr_linenumber" name="L6" href="#L6">6</a> <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
<a class="jxr_linenumber" name="L7" href="#L7">7</a> <em class="jxr_comment"> * the License. You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="L8" href="#L8">8</a> <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="L9" href="#L9">9</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2." target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.</a>0</em>
<a class="jxr_linenumber" name="L10" href="#L10">10</a> <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="L11" href="#L11">11</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="L12" href="#L12">12</a> <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="L13" href="#L13">13</a> <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="L14" href="#L14">14</a> <em class="jxr_comment"> * See the license for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="L15" href="#L15">15</a> <em class="jxr_comment"> * limitations under the license.</em>
<a class="jxr_linenumber" name="L16" href="#L16">16</a> <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="L17" href="#L17">17</a> <strong class="jxr_keyword">package</strong> org.apache.logging.log4j.core;
<a class="jxr_linenumber" name="L18" href="#L18">18</a>
<a class="jxr_linenumber" name="L19" href="#L19">19</a> <strong class="jxr_keyword">import</strong> java.io.Serializable;
<a class="jxr_linenumber" name="L20" href="#L20">20</a>
<a class="jxr_linenumber" name="L21" href="#L21">21</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L22" href="#L22">22</a> <em class="jxr_javadoccomment"> * Appends {@link LogEvent}s. An Appender can contain a {@link Layout} if applicable as well</em>
<a class="jxr_linenumber" name="L23" href="#L23">23</a> <em class="jxr_javadoccomment"> * as an {@link ErrorHandler}. Typical Appender implementations coordinate with an</em>
<a class="jxr_linenumber" name="L24" href="#L24">24</a> <em class="jxr_javadoccomment"> * implementation of {@link org.apache.logging.log4j.core.appender.AbstractManager} to handle external resources</em>
<a class="jxr_linenumber" name="L25" href="#L25">25</a> <em class="jxr_javadoccomment"> * such as streams, connections, and other shared state. As Appenders are plugins, concrete implementations need to</em>
<a class="jxr_linenumber" name="L26" href="#L26">26</a> <em class="jxr_javadoccomment"> * be annotated with {@link org.apache.logging.log4j.core.config.plugins.Plugin} and need to provide a static</em>
<a class="jxr_linenumber" name="L27" href="#L27">27</a> <em class="jxr_javadoccomment"> * factory method annotated with {@link org.apache.logging.log4j.core.config.plugins.PluginFactory}.</em>
<a class="jxr_linenumber" name="L28" href="#L28">28</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L29" href="#L29">29</a> <em class="jxr_javadoccomment"> * &lt;p&gt;Most core plugins are written using a related Manager class that handle the actual task of serializing a</em>
<a class="jxr_linenumber" name="L30" href="#L30">30</a> <em class="jxr_javadoccomment"> * {@link LogEvent} to some output location. For instance, many Appenders can take</em>
<a class="jxr_linenumber" name="L31" href="#L31">31</a> <em class="jxr_javadoccomment"> * advantage of the {@link org.apache.logging.log4j.core.appender.OutputStreamManager} class.&lt;/p&gt;</em>
<a class="jxr_linenumber" name="L32" href="#L32">32</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L33" href="#L33">33</a> <em class="jxr_javadoccomment"> * &lt;p&gt;It is recommended that Appenders don't do any heavy lifting since there can be many instances of the class</em>
<a class="jxr_linenumber" name="L34" href="#L34">34</a> <em class="jxr_javadoccomment"> * being used at any given time. When resources require locking (e.g., through {@link java.nio.channels.FileLock}),</em>
<a class="jxr_linenumber" name="L35" href="#L35">35</a> <em class="jxr_javadoccomment"> * it is important to isolate synchronized code to prevent concurrency issues.&lt;/p&gt;</em>
<a class="jxr_linenumber" name="L36" href="#L36">36</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L37" href="#L37">37</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">interface</strong> <a href="../../../../../org/apache/logging/log4j/core/Appender.html">Appender</a> <strong class="jxr_keyword">extends</strong> <a href="../../../../../org/apache/logging/log4j/core/LifeCycle.html">LifeCycle</a> {
<a class="jxr_linenumber" name="L38" href="#L38">38</a>
<a class="jxr_linenumber" name="L39" href="#L39">39</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L40" href="#L40">40</a> <em class="jxr_javadoccomment"> * Main {@linkplain org.apache.logging.log4j.core.config.plugins.Plugin#elementType() plugin element type} for</em>
<a class="jxr_linenumber" name="L41" href="#L41">41</a> <em class="jxr_javadoccomment"> * Appender plugins.</em>
<a class="jxr_linenumber" name="L42" href="#L42">42</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L43" href="#L43">43</a> <em class="jxr_javadoccomment"> * @since 2.6</em>
<a class="jxr_linenumber" name="L44" href="#L44">44</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L45" href="#L45">45</a> String ELEMENT_TYPE = <span class="jxr_string">"appender"</span>;
<a class="jxr_linenumber" name="L46" href="#L46">46</a>
<a class="jxr_linenumber" name="L47" href="#L47">47</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L48" href="#L48">48</a> <em class="jxr_javadoccomment"> * Logs a LogEvent using whatever logic this Appender wishes to use. It is typically recommended to use a</em>
<a class="jxr_linenumber" name="L49" href="#L49">49</a> <em class="jxr_javadoccomment"> * bridge pattern not only for the benefits from decoupling an Appender from its implementation, but it is also</em>
<a class="jxr_linenumber" name="L50" href="#L50">50</a> <em class="jxr_javadoccomment"> * handy for sharing resources which may require some form of locking.</em>
<a class="jxr_linenumber" name="L51" href="#L51">51</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L52" href="#L52">52</a> <em class="jxr_javadoccomment"> * @param event The LogEvent.</em>
<a class="jxr_linenumber" name="L53" href="#L53">53</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L54" href="#L54">54</a> <strong class="jxr_keyword">void</strong> append(<a href="../../../../../org/apache/logging/log4j/core/LogEvent.html">LogEvent</a> event);
<a class="jxr_linenumber" name="L55" href="#L55">55</a>
<a class="jxr_linenumber" name="L56" href="#L56">56</a>
<a class="jxr_linenumber" name="L57" href="#L57">57</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L58" href="#L58">58</a> <em class="jxr_javadoccomment"> * Gets the name of this Appender.</em>
<a class="jxr_linenumber" name="L59" href="#L59">59</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L60" href="#L60">60</a> <em class="jxr_javadoccomment"> * @return name, may be null.</em>
<a class="jxr_linenumber" name="L61" href="#L61">61</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L62" href="#L62">62</a> String getName();
<a class="jxr_linenumber" name="L63" href="#L63">63</a>
<a class="jxr_linenumber" name="L64" href="#L64">64</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L65" href="#L65">65</a> <em class="jxr_javadoccomment"> * Returns the Layout used by this Appender if applicable.</em>
<a class="jxr_linenumber" name="L66" href="#L66">66</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L67" href="#L67">67</a> <em class="jxr_javadoccomment"> * @return the Layout for this Appender or {@code null} if none is configured.</em>
<a class="jxr_linenumber" name="L68" href="#L68">68</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L69" href="#L69">69</a> Layout&lt;? <strong class="jxr_keyword">extends</strong> Serializable&gt; getLayout();
<a class="jxr_linenumber" name="L70" href="#L70">70</a>
<a class="jxr_linenumber" name="L71" href="#L71">71</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L72" href="#L72">72</a> <em class="jxr_javadoccomment"> * Some Appenders need to propagate exceptions back to the application. When {@code ignoreExceptions} is</em>
<a class="jxr_linenumber" name="L73" href="#L73">73</a> <em class="jxr_javadoccomment"> * {@code false} the AppenderControl will allow the exception to percolate.</em>
<a class="jxr_linenumber" name="L74" href="#L74">74</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L75" href="#L75">75</a> <em class="jxr_javadoccomment"> * @return {@code true} if exceptions will be logged but not thrown, {@code false} otherwise.</em>
<a class="jxr_linenumber" name="L76" href="#L76">76</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L77" href="#L77">77</a> <strong class="jxr_keyword">boolean</strong> ignoreExceptions();
<a class="jxr_linenumber" name="L78" href="#L78">78</a>
<a class="jxr_linenumber" name="L79" href="#L79">79</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L80" href="#L80">80</a> <em class="jxr_javadoccomment"> * Gets the {@link ErrorHandler} used for handling exceptions.</em>
<a class="jxr_linenumber" name="L81" href="#L81">81</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L82" href="#L82">82</a> <em class="jxr_javadoccomment"> * @return the ErrorHandler for handling exceptions.</em>
<a class="jxr_linenumber" name="L83" href="#L83">83</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L84" href="#L84">84</a> <a href="../../../../../org/apache/logging/log4j/core/ErrorHandler.html">ErrorHandler</a> getHandler();
<a class="jxr_linenumber" name="L85" href="#L85">85</a>
<a class="jxr_linenumber" name="L86" href="#L86">86</a> <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="L87" href="#L87">87</a> <em class="jxr_javadoccomment"> * Sets the {@link ErrorHandler} used for handling exceptions.</em>
<a class="jxr_linenumber" name="L88" href="#L88">88</a> <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="L89" href="#L89">89</a> <em class="jxr_javadoccomment"> * @param handler the ErrorHandler to use for handling exceptions.</em>
<a class="jxr_linenumber" name="L90" href="#L90">90</a> <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="L91" href="#L91">91</a> <strong class="jxr_keyword">void</strong> setHandler(<a href="../../../../../org/apache/logging/log4j/core/ErrorHandler.html">ErrorHandler</a> handler);
<a class="jxr_linenumber" name="L92" href="#L92">92</a> }
</pre>
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