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Diffstat (limited to 'website2/templates/features/log.html')
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diff --git a/website2/templates/features/log.html b/website2/templates/features/log.html new file mode 100644 index 00000000..e27481b8 --- /dev/null +++ b/website2/templates/features/log.html @@ -0,0 +1,98 @@ +<#import "_features.html" as f> + +<@f.scaffold title="@Log (and friends)" logline="Captain's Log, stardate 24435.7: "What was that line again?""> + <@f.history> + <p> + The various <code>@Log</code> variants were added in lombok v0.10. + <em>NEW in lombok 0.10: </em>You can annotate any class with a log annotation to let lombok generate a logger field.<br/> + The logger is named <code>log</code> and the field's type depends on which logger you have selected. + </p> + </@f.history> + + <@f.overview> + <p> + You put the variant of <code>@Log</code> on your class (whichever one applies to the logging system you use); you then have a static final <code>log</code> field, initialized to the name of your class, which you can then use to write log statements. + </p><p> + There are six choices available:<br /> + <dl> + <dt> + <code>@CommonsLog</code> + </dt><dd> + Creates <code><span class="keyword">private static final </span><a href="https://commons.apache.org/logging/apidocs/org/apache/commons/logging/Log.html">org.apache.commons.logging.Log</a> <span class="staticfield">log</span> = <a href="https://commons.apache.org/logging/apidocs/org/apache/commons/logging/LogFactory.html#getLog(java.lang.Class)">org.apache.commons.logging.LogFactory.getLog</a>(LogExample.<span class="keyword">class</span>);</code> + </dd><dt> + <code>@Log</code> + </dt><dd> + Creates <code><span class="keyword">private static final </span><a href="http://download.oracle.com/javase/6/docs/api/java/util/logging/Logger.html">java.util.logging.Logger</a> <span class="staticfield">log</span> = <a href="http://download.oracle.com/javase/6/docs/api/java/util/logging/Logger.html#getLogger(java.lang.String)">java.util.logging.Logger.getLogger</a>(LogExample.<span class="keyword">class</span>.getName());</code> + </dd><dt> + <code>@Log4j</code> + </dt><dd> + Creates <code><span class="keyword">private static final </span><a href="https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Logger.html">org.apache.log4j.Logger</a> <span class="staticfield">log</span> = <a href="https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Logger.html#getLogger(java.lang.Class)">org.apache.log4j.Logger.getLogger</a>(LogExample.<span class="keyword">class</span>);</code> + </dd><dt> + <code>@Log4j2</code> + </dt><dd> + Creates <code><span class="keyword">private static final </span><a href="https://logging.apache.org/log4j/2.0/log4j-api/apidocs/org/apache/logging/log4j/Logger.html">org.apache.logging.log4j.Logger</a> <span class="staticfield">log</span> = <a href="https://logging.apache.org/log4j/2.0/log4j-api/apidocs/org/apache/logging/log4j/LogManager.html#getLogger(java.lang.Class)">org.apache.logging.log4j.LogManager.getLogger</a>(LogExample.<span class="keyword">class</span>);</code> + </dd><dt> + <code>@Slf4j</code> + </dt><dd> + Creates <code><span class="keyword">private static final </span><a href="http://www.slf4j.org/api/org/slf4j/Logger.html">org.slf4j.Logger</a> <span class="staticfield">log</span> = <a href="http://www.slf4j.org/apidocs/org/slf4j/LoggerFactory.html#getLogger(java.lang.Class)">org.slf4j.LoggerFactory.getLogger</a>(LogExample.<span class="keyword">class</span>);</code> + </dd><dt> + <code>@XSlf4j</code> + </dt><dd> + Creates <code><span class="keyword">private static final </span><a href="http://www.slf4j.org/api/org/slf4j/ext/XLogger.html">org.slf4j.ext.XLogger</a> <span class="staticfield">log</span> = <a href="http://www.slf4j.org/apidocs/org/slf4j/ext/XLoggerFactory.html#getXLogger(java.lang.Class)">org.slf4j.ext.XLoggerFactory.getXLogger</a>(LogExample.<span class="keyword">class</span>);</code> + </dd> + </dl> + </p><p> + By default, the topic (or name) of the logger will be the class name of the class annotated with the <code>@Log</code> annotation. This can be customised by specifying the <code>topic</code> parameter. For example: <code>@XSlf4j(topic="reporting")</code>. + </p> + </@f.overview> + + <@f.snippets name="Log" /> + + <@f.confKeys> + <dt> + <code>lombok.log.fieldName</code> = <em>an identifier</em> (default: <code>log</code>). + </dt><dd> + The generated logger fieldname is by default '<code>log</code>', but you can change it to a different name with this setting. + </dd><dt> + <code>lombok.log.fieldIsStatic</code> = [<code>true</code> | <code>false</code>] (default: true) + </dt><dd> + Normally the generated logger is a <code>static</code> field. By setting this key to <code>false</code>, the generated field will be an instance field instead. + </dd><dt> + <code>lombok.log.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set) + </dt><dd> + Lombok will flag any usage of any of the various log annotations as a warning or error if configured. + </dd><dt> + <code>lombok.log.apacheCommons.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set) + </dt><dd> + Lombok will flag any usage of <code>@lombok.extern.apachecommons.CommonsLog</code> as a warning or error if configured. + </dd><dt> + <code>lombok.log.javaUtilLogging.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set) + </dt><dd> + Lombok will flag any usage of <code>@lombok.extern.java.Log</code> as a warning or error if configured. + </dd><dt> + <code>lombok.log.log4j.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set) + </dt><dd> + Lombok will flag any usage of <code>@lombok.extern.log4j.Log4j</code> as a warning or error if configured. + </dd><dt> + <code>lombok.log.log4j2.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set) + </dt><dd> + Lombok will flag any usage of <code>@lombok.extern.log4j.Log4j2</code> as a warning or error if configured. + </dd><dt> + <code>lombok.log.slf4j.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set) + </dt><dd> + Lombok will flag any usage of <code>@lombok.extern.slf4j.Slf4j</code> as a warning or error if configured. + </dd><dt> + <code>lombok.log.xslf4j.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set) + </dt><dd> + Lombok will flag any usage of <code>@lombok.extern.slf4j.XSlf4j</code> as a warning or error if configured. + </dd> + </@f.confKeys> + + <@f.smallPrint> + <p> + If a field called <code>log</code> already exists, a warning will be emitted and no code will be generated. + </p><p> + A future feature of lombok's diverse log annotations is to find calls to the logger field and, if the chosen logging framework supports it and the log level can be compile-time determined from the log call, guard it with an <code>if</code> statement. This way if the log statement ends up being ignored, the potentially expensive calculation of the log string is avoided entirely. This does mean that you should <em>NOT</em> put any side-effects in the expression that you log. + </p> + </@f.smallPrint> +</@f.scaffold> |