Java by API/java.util.logging/Filter

implements Filter

  

import java.util.logging.Filter;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
public class Main {
  private static Logger logger = Logger.getLogger("SimpleFilter");
  static class A {
  };
  static class B {
  };
  static void sendLogMessages() {
    logger.log(Level.WARNING, "message 1!", new A());
    logger.log(Level.WARNING, "message 2!", new B());
  }
  public static void main(String[] args) {
    sendLogMessages();
    logger.setFilter(new Filter() {
      public boolean isLoggable(LogRecord record) {
        Object[] params = record.getParameters();
        if (params == null)
          return true;
        if (record.getParameters()[0] instanceof A)
          return true;
        return false;
      }
    });
    logger.info("After setting filter..");
    sendLogMessages();
  }
}