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HADOOP-13470. GenericTestUtils$LogCapturer is flaky. (Contributed by Mingliang Liu)

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This commit is contained in:
Mingliang Liu 2016-08-16 16:30:43 -07:00
parent 3808876c73
commit 23532716fc
2 changed files with 63 additions and 12 deletions
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31
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/GenericTestUtils.java
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@ -42,10 +42,12 @@
import org.apache.hadoop.fs.FileUtil;
import org.apache.hadoop.util.StringUtils;
import org.apache.hadoop.util.Time;
import org.apache.log4j.Appender;
import org.apache.log4j.Layout;
import org.apache.log4j.Level;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.WriterAppender;
import org.junit.Assert;
import org.junit.Assume;
@ -275,36 +277,41 @@ public static class LogCapturer {
private StringWriter sw = new StringWriter();
private WriterAppender appender;
private Logger logger;
public static LogCapturer captureLogs(Log l) {
Logger logger = ((Log4JLogger)l).getLogger();
LogCapturer c = new LogCapturer(logger);
return c;
return new LogCapturer(logger);
}
public static LogCapturer captureLogs(org.slf4j.Logger logger) {
return new LogCapturer(toLog4j(logger));
}
private LogCapturer(Logger logger) {
this.logger = logger;
Layout layout = Logger.getRootLogger().getAppender("stdout").getLayout();
WriterAppender wa = new WriterAppender(layout, sw);
logger.addAppender(wa);
Appender defaultAppender = Logger.getRootLogger().getAppender("stdout");
if (defaultAppender == null) {
defaultAppender = Logger.getRootLogger().getAppender("console");
}
final Layout layout = (defaultAppender == null) ? new PatternLayout() :
defaultAppender.getLayout();
this.appender = new WriterAppender(layout, sw);
logger.addAppender(this.appender);
}
public String getOutput() {
return sw.toString();
}
public void stopCapturing() {
logger.removeAppender(appender);
}
public void clearOutput() {
sw.getBuffer().setLength(0);
}
}
/**
* Mockito answer helper that triggers one latch as soon as the
* method is called, then waits on another before continuing.

44
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/test/TestGenericTestUtils.java
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@ -18,8 +18,16 @@
package org.apache.hadoop.test;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.junit.Assert.assertTrue;
public class TestGenericTestUtils extends GenericTestUtils {
@Test
@ -75,4 +83,40 @@ public String toString() {
}
}
@Test(timeout = 10000)
public void testLogCapturer() {
final Log log = LogFactory.getLog(TestGenericTestUtils.class);
LogCapturer logCapturer = LogCapturer.captureLogs(log);
final String infoMessage = "info message";
// test get output message
log.info(infoMessage);
assertTrue(logCapturer.getOutput().endsWith(
String.format(infoMessage + "%n")));
// test clear output
logCapturer.clearOutput();
assertTrue(logCapturer.getOutput().isEmpty());
// test stop capturing
logCapturer.stopCapturing();
log.info(infoMessage);
assertTrue(logCapturer.getOutput().isEmpty());
}
@Test(timeout = 10000)
public void testLogCapturerSlf4jLogger() {
final Logger logger = LoggerFactory.getLogger(TestGenericTestUtils.class);
LogCapturer logCapturer = LogCapturer.captureLogs(logger);
final String infoMessage = "info message";
// test get output message
logger.info(infoMessage);
assertTrue(logCapturer.getOutput().endsWith(
String.format(infoMessage + "%n")));
// test clear output
logCapturer.clearOutput();
assertTrue(logCapturer.getOutput().isEmpty());
// test stop capturing
logCapturer.stopCapturing();
logger.info(infoMessage);
assertTrue(logCapturer.getOutput().isEmpty());
}
}