/**
    * Copyright (c) 2004-2011 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 org.apache.log4j.FileAppender;
  import org.apache.log4j.PatternLayout;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.slf4j.LoggerFactory;
  
  public class SLF4JBridgeHandlerPerfTest {
  
      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;
  
      @Before
      public void setUp() throws Exception {
          fileAppender = new FileAppender(new PatternLayout("%r [%t] %p %c %x - %m%n"), "target/test-output/toto.log");
  
          existingHandlers = julRootLogger.getHandlers();
          for (Handler existingHandler : existingHandlers) {
              julRootLogger.removeHandler(existingHandler);
          }
          log4jRoot = org.apache.log4j.Logger.getRootLogger();
          log4jRoot.addAppender(fileAppender);
      }
  
      @After
      public void tearDown() throws Exception {
          SLF4JBridgeHandler.uninstall();
          fileAppender.close();
          log4jRoot.getLoggerRepository().resetConfiguration();
          for (Handler existingHandler : existingHandlers) {
              julRootLogger.addHandler(existingHandler);
          }
      }
  
      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;
      }
  
      @Test
      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));
     }
 }