/*
* Copyright (c) 2004-2008 QOS.ch
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package org.slf4j.bridge;
import java.util.logging.Handler;
import java.util.logging.LogManager;
import junit.framework.TestCase;
import org.apache.log4j.FileAppender;
import org.apache.log4j.PatternLayout;
import org.slf4j.LoggerFactory;
public class SLF4JBridgeHandlerPerfTest extends TestCase {
static String LOGGER_NAME = "yay";
static int RUN_LENGTH = 100*1000;
// set to false to test enabled logging performance
boolean disabledLogger = true;
FileAppender fileAppender;
org.apache.log4j.Logger log4jRoot;
java.util.logging.Logger julRootLogger = LogManager.getLogManager()
.getLogger("");
java.util.logging.Logger julLogger = java.util.logging.Logger
.getLogger(LOGGER_NAME);
org.slf4j.Logger slf4jLogger = LoggerFactory.getLogger(LOGGER_NAME);
Handler[] existingHandlers;
public SLF4JBridgeHandlerPerfTest(String arg0) {
super(arg0);
}
protected void setUp() throws Exception {
super.setUp();
fileAppender = new FileAppender(new PatternLayout("%r [%t] %p %c %x - %m%n"), "target/test-output/toto.log");
existingHandlers = julRootLogger.getHandlers();
for (int i = 0; i < existingHandlers.length; i++) {
julRootLogger.removeHandler(existingHandlers[i]);
}
log4jRoot = org.apache.log4j.Logger.getRootLogger();
log4jRoot.addAppender(fileAppender);
}
protected void tearDown() throws Exception {
super.tearDown();
SLF4JBridgeHandler.uninstall();
fileAppender.close();
log4jRoot.getLoggerRepository().resetConfiguration();
for (int i = 0; i < existingHandlers.length; i++) {
julRootLogger.addHandler(existingHandlers[i]);
}
}
double julLoggerLoop() {
long start = System.nanoTime();
for (int i = 0; i < RUN_LENGTH; i++) {
julLogger.info("jul");
}
long end = System.nanoTime();
return (end - start) * 1.0 / RUN_LENGTH;
}
double slf4jLoggerLoop() {
long start = System.nanoTime();
for (int i = 0; i < RUN_LENGTH; i++) {
slf4jLogger.info("slf4j");
}
long end = System.nanoTime();
return (end - start) * 1.0 / RUN_LENGTH;
}
public void testPerf() {
SLF4JBridgeHandler.install();
if(disabledLogger) {
log4jRoot.setLevel(org.apache.log4j.Level.ERROR);
}
julLoggerLoop();
double julAvg=julLoggerLoop();
System.out.println("Average cost per call (JUL->SLF4J->log4j): "+julAvg +" nanos");
slf4jLoggerLoop();
double slf4jAvg=slf4jLoggerLoop();
System.out.println("Average cost per call (SLF4J->log4j): "+slf4jAvg +" nanos");
System.out.println("Ratio "+(julAvg/slf4jAvg));
}
}