/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache license, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the license for the specific language governing permissions and
* limitations under the license.
*/
package org.apache.logging.log4j;
import org.apache.logging.log4j.core.Timer;
import org.apache.logging.log4j.core.helpers.Loader;
import org.apache.logging.log4j.message.Message;
import org.apache.logging.log4j.message.SimpleMessage;
import org.apache.logging.log4j.message.StringFormattedMessage;
import org.junit.BeforeClass;
import org.junit.Test;
import sun.reflect.Reflection;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
/**
* Tests the cost of invoking Reflection.getCallerClass via reflection vs calling it directly.
*/
public class ReflectionComparison {
private static Method getCallerClass;
private static final int COUNT = 1000000;
private static Class[] paramTypes = new Class[] {String.class, Object[].class};
@BeforeClass
public static void setupCallerCheck() {
try {
ClassLoader loader = Loader.getClassLoader();
Class clazz = loader.loadClass("sun.reflect.Reflection");
Method[] methods = clazz.getMethods();
for (Method method : methods) {
int modifier = method.getModifiers();
if (method.getName().equals("getCallerClass") && Modifier.isStatic(modifier)) {
getCallerClass = method;
break;
}
}
} catch (ClassNotFoundException cnfe) {
cnfe.printStackTrace();
throw new RuntimeException(cnfe);
}
}
@Test
public void test1() {
Timer timer = new Timer("Reflection", COUNT);
timer.start();
Object[] arr = new Object[1];
arr[0] = 3;
for (int i= 0; i < COUNT; ++i) {
getCallerClass(arr);
}
timer.stop();
System.out.println(timer.toString());
}
@Test
public void test2() {
Timer timer = new Timer("Reflection", COUNT);
timer.start();
for (int i= 0; i < COUNT; ++i) {
Reflection.getCallerClass(3);
}
timer.stop();
System.out.println(timer.toString());
}
@Test
public void createObjects() throws Exception {
Timer timer = new Timer("NewObject", COUNT);
timer.start();
Message msg;
for (int i = 0; i < COUNT; ++i) {
msg = new StringFormattedMessage("Hello %1", i);
}
timer.stop();
System.out.println(timer.toString());
Class<? extends Message> clazz = StringFormattedMessage.class;
timer = new Timer("ReflectionObject", COUNT);
timer.start();
for (int i = 0; i < COUNT; ++i) {
createMessage(clazz, "Hello %1", i);
}
timer.stop();
System.out.println(timer.toString());
}
private Class getCallerClass(Object[] array) {
if (getCallerClass != null) {
try {
/*Object[] params = new Object[]{index}; */
return (Class) getCallerClass.invoke(null, array);
} catch (Exception ex) {
fail(ex.getMessage());
// logger.debug("Unable to determine caller class via Sun Reflection", ex);
}
}
return null;
}
private Message createMessage(Class<? extends Message> clazz, String msg, Object... params) throws Exception {
Constructor constructor = clazz.getConstructor(paramTypes);
return (Message) constructor.newInstance(msg, params);
}
}