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Initial fully-functional version of DispatcherAppender
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target | ||
bin | ||
.classpath | ||
.project | ||
.settings | ||
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Log4j DispatcherAppender | ||
======================== | ||
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A Log4j Appender that dispatches to a different Appender instance depending | ||
on the value of the NDC. | ||
A [Log4j](http://logging.apache.org/log4j/1.2) `Appender` that | ||
dispatches to a different `Appender` instance depending on the value | ||
of the [Nested Diagnostic | ||
Context](http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/NDC.html). | ||
The delegate appender is copied and a single property is overriden | ||
(e.g. a file location) based on a layout pattern. A typical use case | ||
would be directing logs to a different file based on the business data | ||
that are being processed. | ||
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Note that adding an appender to an existing one cannot be done using | ||
the Log4j `PropertiesConfigurator` so you have to use XML or Java to | ||
configure a `DispatcherAppender`. | ||
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License: Apache 2.0 | ||
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Usage | ||
----- | ||
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Sample `log4j.xml`: | ||
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<?xml version="1.0" encoding="UTF-8"?> | ||
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> | ||
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<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false"> | ||
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<appender name="LOGGER" class="org.springframework.util.log4j.DispatcherAppender"> | ||
<param name="propertyName" value="file" /> | ||
<layout class="org.apache.log4j.PatternLayout"> | ||
<param name="ConversionPattern" value="target/logs/%x.log" /> | ||
</layout> | ||
<appender-ref ref="FILE" /> | ||
</appender> | ||
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<appender name="FILE" class="org.apache.log4j.FileAppender"> | ||
<param name="file" value="target/logs/default.log" /> | ||
<layout class="org.apache.log4j.PatternLayout"> | ||
<param name="ConversionPattern" value="%5p: %m%n" /> | ||
</layout> | ||
</appender> | ||
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<root> | ||
<priority value="info" /> | ||
<appender-ref ref="LOGGER" /> | ||
</root> | ||
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</log4j:configuration> | ||
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Application code: | ||
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logger.info("foo"); | ||
NDC.push("alt"); | ||
try { | ||
logger.info("foo"); | ||
} finally { | ||
NDC.clear(); | ||
} | ||
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Result: | ||
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$ ls target/logs | ||
default.log alt.log |
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<?xml version="1.0" encoding="UTF-8"?> | ||
<project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd" | ||
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> | ||
<modelVersion>4.0.0</modelVersion> | ||
<groupId>org.springframework.samples</groupId> | ||
<artifactId>log4j-utils</artifactId> | ||
<version>1.0.0.BUILD-SNAPSHOT</version> | ||
<properties> | ||
<maven.test.failure.ignore>true</maven.test.failure.ignore> | ||
</properties> | ||
<profiles> | ||
<profile> | ||
<id>strict</id> | ||
<properties> | ||
<maven.test.failure.ignore>false</maven.test.failure.ignore> | ||
</properties> | ||
</profile> | ||
</profiles> | ||
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<dependencies> | ||
<dependency> | ||
<groupId>junit</groupId> | ||
<artifactId>junit</artifactId> | ||
<version>4.8.2</version> | ||
<scope>test</scope> | ||
</dependency> | ||
<dependency> | ||
<groupId>log4j</groupId> | ||
<artifactId>log4j</artifactId> | ||
<version>1.2.14</version> | ||
<scope>compile</scope> | ||
</dependency> | ||
<dependency> | ||
<groupId>commons-io</groupId> | ||
<artifactId>commons-io</artifactId> | ||
<version>1.4</version> | ||
<scope>test</scope> | ||
</dependency> | ||
</dependencies> | ||
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<build> | ||
<pluginManagement> | ||
<plugins> | ||
<plugin> | ||
<artifactId>maven-assembly-plugin</artifactId> | ||
<inherited>false</inherited> | ||
<configuration> | ||
<descriptorRefs> | ||
<descriptorRef>project</descriptorRef> | ||
</descriptorRefs> | ||
</configuration> | ||
</plugin> | ||
</plugins> | ||
</pluginManagement> | ||
<plugins> | ||
<plugin> | ||
<groupId>org.apache.maven.plugins</groupId> | ||
<artifactId>maven-compiler-plugin</artifactId> | ||
<configuration> | ||
<source>1.5</source> | ||
<target>1.5</target> | ||
</configuration> | ||
</plugin> | ||
<plugin> | ||
<groupId>org.apache.maven.plugins</groupId> | ||
<artifactId>maven-surefire-plugin</artifactId> | ||
<configuration> | ||
<!--forkMode>pertest</forkMode --> | ||
<includes> | ||
<include>**/*Tests.java</include> | ||
</includes> | ||
<excludes> | ||
<exclude>**/Abstract*.java</exclude> | ||
</excludes> | ||
</configuration> | ||
</plugin> | ||
</plugins> | ||
</build> | ||
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</project> |
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