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HADOOP-14706. Adding a helper method to determine whether a log is Log4j implement. 

This closes #258

Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
This commit is contained in:
wenxinhe 2017-08-01 16:19:00 +08:00 committed by Akira Ajisaka
parent 88d6adf419
commit 11e1e0c275
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GPG Key ID: C1EDBB9CA400FD50
3 changed files with 21 additions and 1 deletions
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2
hadoop-common-project/hadoop-common/pom.xml
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@ -170,7 +170,7 @@
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<scope>runtime</scope>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>

15
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/GenericsUtil.java
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@ -23,6 +23,9 @@ import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.impl.Log4jLoggerAdapter;
/**
* Contains utility methods for dealing with Java Generics.
@ -72,4 +75,16 @@ public class GenericsUtil {
return toArray(getClass(list.get(0)), list);
}
/**
* Determine whether the log of <code>clazz</code> is Log4j implementation.
* @param clazz a class to be determined
* @return true if the log of <code>clazz</code> is Log4j implementation.
*/
public static boolean isLog4jLogger(Class<?> clazz) {
if (clazz == null) {
return false;
}
Logger log = LoggerFactory.getLogger(clazz);
return log instanceof Log4jLoggerAdapter;
}
}

5
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/util/TestGenericsUtil.java
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@ -131,4 +131,9 @@ public class TestGenericsUtil extends TestCase {
GenericClass.class, c2);
}
public void testIsLog4jLogger() throws Exception {
assertFalse("False if clazz is null", GenericsUtil.isLog4jLogger(null));
assertTrue("The implementation is Log4j",
GenericsUtil.isLog4jLogger(TestGenericsUtil.class));
}
}