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The source code

/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software
 * License version 1.1, a copy of which has been included with this
 * distribution in the LICENSE.txt file.  */

package org.apache.log4j.nt;

import org.apache.log4j.*;
import org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.Level;
import org.apache.log4j.helpers.LogLog;

import java.io.*;


/**
   Append to the NT event log system.

   

WARNING This appender can only be installed and used on a Windows system.

Do not forget to place the file NTEventLogAppender.dll in a directory that is on the PATH of the Windows system. Otherwise, you will get a java.lang.UnsatisfiedLinkError. @author Chris Taylor @author Jim Cakalic */ public class NTEventLogAppender extends AppenderSkeleton { private int _handle = 0; private String source = null; private String server = null; private static final int FATAL = Level.FATAL.toInt(); private static final int ERROR = Level.ERROR.toInt(); private static final int WARN = Level.WARN.toInt(); private static final int INFO = Level.INFO.toInt(); private static final int DEBUG = Level.DEBUG.toInt(); public NTEventLogAppender() { this(null, null, null); } public NTEventLogAppender(String source) { this(null, source, null); } public NTEventLogAppender(String server, String source) { this(server, source, null); } public NTEventLogAppender(Layout layout) { this(null, null, layout); } public NTEventLogAppender(String source, Layout layout) { this(null, source, layout); } public NTEventLogAppender(String server, String source, Layout layout) { if (source == null) { source = "Log4j"; } if (layout == null) { this.layout = new TTCCLayout(); } else { this.layout = layout; } try { _handle = registerEventSource(server, source); } catch (Exception e) { e.printStackTrace(); _handle = 0; } } public void close() { // unregister ... } public void activateOptions() { if (source != null) { try { _handle = registerEventSource(server, source); } catch (Exception e) { LogLog.error("Could not register event source.", e); _handle = 0; } } } public void append(LoggingEvent event) { StringBuffer sbuf = new StringBuffer(); sbuf.append(layout.format(event)); if(layout.ignoresThrowable()) { String[] s = event.getThrowableStrRep(); if (s != null) { int len = s.length; for(int i = 0; i < len; i++) { sbuf.append(s[i]); } } } // Normalize the log message level into the supported categories int nt_category = event.getLevel().toInt(); // Anything above FATAL or below DEBUG is labeled as INFO. //if (nt_category > FATAL || nt_category < DEBUG) { // nt_category = INFO; //} reportEvent(_handle, sbuf.toString(), nt_category); } public void finalize() { deregisterEventSource(_handle); _handle = 0; } /** The Source option which names the source of the event. The current value of this constant is Source. */ public void setSource(String source) { this.source = source.trim(); } public String getSource() { return source; } /** The NTEventLogAppender requires a layout. Hence, this method always returns true. */ public boolean requiresLayout() { return true; } native private int registerEventSource(String server, String source); native private void reportEvent(int handle, String message, int level); native private void deregisterEventSource(int handle); static { System.loadLibrary("NTEventLogAppender"); } }

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