Measuring Performance Using Perf4j Library

• “Perf4j.jar” is a java library for measuring performance of a java file.
• The Download link:-

• In this Demo, “We are using LOG4J library to log in the console.Logger Info will print the numbers in the console. A timer is used to randomly select some Milli seconds to delay”.
• The Project Structure:-

• The java code for testing Perf4j is Perf4jDemo.java,

package com.sandeep.perf4j.test;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
import org.perf4j.StopWatch;
import org.perf4j.log4j.Log4JStopWatch;

public class Perf4jDemo {

 private static final Logger logger = Logger.getLogger(Perf4jDemo.class);
 
 public static void main(String[] args) {
  
  BasicConfigurator.configure();

  StopWatch watch = new Log4JStopWatch();
  
  logger.info("start time : "+watch.getStartTime());
  
  
     try {
      
   Thread.sleep((long)(Math.random() * 1000L));
   
  } catch (InterruptedException e) {
   
   logger.error("InterruptedException : "+e);
  }
    
  
  logger.info("Elapsed Time : "+ watch.getElapsedTime());
  
  logger.info("Stop Time : "+watch.stop());
 }
}

• The log4j.properties file,

          log4j.rootLogger=DEBUG, A1
          log4j.appender.A1=org.apache.log4j.ConsoleAppender
          log4j.appender.A1.layout=org.apache.log4j.PatternLayout
          log4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c – %m%n
         # Print only messages of level WARN or above in the package com.foo.
          log4j.logger.com.foo=INFO 

• The Output in console(text),

        INFO com.sandeep.perf4j.test.Perf4jDemo  – start time : 1363364781687
        INFO com.sandeep.perf4j.test.Perf4jDemo  – Elapsed Time : 155
        INFO org.perf4j.TimingLogger  – start[1363364781687] time[155] tag[]        INFO com.sandeep.perf4j.test.Perf4jDemo  – Stop Time : start[1363364781687]  time[155]  

• The output of the java file Console is(screenshot),

• The Demo Code :-

          Download Link