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SimpleFilter.java
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// logging/SimpleFilter.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// {ErrorOutputExpected}
import java.util.logging.*;
public class SimpleFilter {
private static Logger logger =
Logger.getLogger("SimpleFilter");
static class Duck {};
static class Wombat {};
static void sendLogMessages() {
logger.log(Level.WARNING,
"A duck in the house!", new Duck());
logger.log(Level.WARNING,
"A Wombat at large!", new Wombat());
}
public static void main(String[] args) {
sendLogMessages();
logger.setFilter(record -> {
Object[] params =
record.getParameters();
if(params == null)
return true; // No parameters
if(record.getParameters()[0]
instanceof Duck)
return true; // Only log Ducks
return false;
});
logger.info("After setting filter..");
sendLogMessages();
}
}
/* Output:
___[ Error Output ]___
Dec 15, 2015 9:58:44 PM SimpleFilter sendLogMessages
WARNING: A duck in the house!
Dec 15, 2015 9:58:44 PM SimpleFilter sendLogMessages
WARNING: A Wombat at large!
Dec 15, 2015 9:58:44 PM SimpleFilter main
INFO: After setting filter..
Dec 15, 2015 9:58:44 PM SimpleFilter sendLogMessages
WARNING: A duck in the house!
___[ Error Output is Expected ]___
*/