All Known Implementing Classes:

LogNotifyCalculateIncremental
```
public interface ILogNotify
```
ILogNotify: Interface to add custom fields to the Wowza Streaming Engine log files. To add your own custom log fields, define a class that implements this interface. The onLog method will be called each time the Wowza Streaming Engine server logs a message. Here is an example of a simple ILogNotify class that logs the current system time in milliseconds as a Long (systime-long) and as a String (systime-string).
```
package com.wowza.wms.plugin.newlogfields;

import org.apache.log4j.*;

import com.wowza.wms.logging.*;
import com.wowza.wms.stream.*;

public class LogNotifyDocs implements ILogNotify
{
        public void onLog(Level level, String comment, IMediaStream stream, String category, String event, int status, String context)
        {
                long systime = System.currentTimeMillis();
                WMSLoggerFactory.putGlobalLogValue("systime-long", new Long(systime));
                WMSLoggerFactory.putGlobalLogValue("systime-string", systime+"");
        }
}
```
Note: To get any of the values currently being logged use the logging API WMSLoggerFactory.getGlobalLogValue(WMSLoggerIDs.FD_*)

To add your class to Wowza Streaming Engine, compile your class into a .class file, bind the class into a .jar file and copy the .jar file into the Wowza Streaming Engine server /lib folder. Next, edit:
- [install-dir]/conf/Tune.xml
Add -Dcom.wowza.wms.logging.LogNotify=[full-path-to-your-ILogNotify-class] to the VMOptions in Tune.xml. For example for the class above the VMOption would look like:
```
 
<VMOption>-Dcom.wowza.wms.logging.LogNotify=com.wowza.wms.plugin.newlogfields.NewLogFields</VMOption>
```
Next, edit [install-dir]/conf/log4j.properties and add the new field names to any log4j.appender.[appender-name].layout.Fields fields lists to which you want to log these values. For example:
log4j.appender.stdout.layout.Fields=x-severity,x-category,x-event,x-ctx,x-comment,systime-long,systime-string

Method Summary

All Methods Instance Methods Default Methods
Modifier and Type	Method	Description
`default void`	`onLog(WMSLogger logger, WMSLoggerEvent logEvent)`	Called each time the server logs a message.
`default void`	`onLog(org.apache.logging.log4j.Level level, String comment, IMediaStream stream, String category, String event, int status, String context)`	Called each time the server logs a message.

- Method Detail
  - onLog
```
default void onLog(org.apache.logging.log4j.Level level,
                   String comment,
                   IMediaStream stream,
                   String category,
                   String event,
                   int status,
                   String context)
```
    Called each time the server logs a message.
    
    Parameters:
    
    level - log level as defined by (org.apache.logging.log4j.Level)
    
    comment - comment part of the log statement
    
    stream - if stream category log message it's the source stream
    
    category - log category as defined by WMSLoggerIDs.CAT_*
    
    event - log event as defined by WMSLoggerIDs.EVT_*
    
    status - log status (same as HTTP status field) as defined by WMSLoggerIDs.STAT_*
    
    context - log context value like stream name, vhost name, application name
  - onLog
```
default void onLog(WMSLogger logger,
                   WMSLoggerEvent logEvent)
```
    Called each time the server logs a message.
    
    Parameters:
    
    logger - logger being used
    
    logEvent - log event data

Interface ILogNotify

Method Summary

Method Detail

onLog

onLog