Source Code : Java log: log filter

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Java log: log filter

    
/*
Logging In Java with the JDK 1.4 Logging API and Apache log4j
by Samudra Gupta    
Apress Copyright 2003 
ISBN:1590590996

*/
import java.util.logging.*;

public class FilterDemo
{
  private Logger logger = null;
  private AgeFilter filter = null;

  public FilterDemo()
  {
    //obtaining a logger object
    logger = Logger.getLogger("sam.logging");
    //creating a AgeFilter object
    filter = new AgeFilter();
    //attaching the filter to the logger
    logger.setFilter(filter);
  }

  /**
   * This method logs the message
   */
  public void logMessage(Person person)
  {
    //logging the message with Person object as parameter
    logger.log(Level.INFO, "Person has age "+person.getAge(), person);
  }

  public static void main(String args[])
  {
    FilterDemo demo = new FilterDemo();
    //creating Person objects
    Person person1 = new Person("Paul", 32);
    Person person2 = new Person("sam", 29);
    //logging with each Person object
    demo.logMessage(person1);
    demo.logMessage(person2);
  }
}

class Person{
  private String name = null;
  private int age;

  public Person(String name, int age)
  {
   this.name = name;
   this.age = age;
  }

  public void setName(String name)
  {
   this.name = name;
  }

  public String getName()
  {
   return name;
  }

  public void setAge(int age)
  {
   this.age = age;
  }

  public int getAge()
  {
   return age;
  }
}

class AgeFilter implements Filter {
    public AgeFilter() {
    }
    /**
     * This is the overridden method from the Filter interface.
     * It checks the Person object associated with the LogRecord
     * checks the age>30, and returns true
     *@param record the LogRecord object
     *@return boolean true/false
     */
    public boolean isLoggable(LogRecord record) {
        boolean result = false;
        //obtaining the Person object from the record
        Object[] objs = record.getParameters();
        Person person = (Person)objs[0];

        //check if person is not null
        if(person !=null) {
            //obtain the age
            int age = person.getAge();
            if(age>30)
                result = true;
            else
                result = false;
        }
        return result;
    }
}
           
         
    
    
    
  

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