/*
* 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.
<p><b>WARNING</b> This appender can only be installed and used on a
Windows system.
<p>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 <a href="mailto:[email protected]">Chris Taylor</a>
@author <a href="mailto:[email protected]">Jim Cakalic</a> */
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 <b>Source</b> option which names the source of the event. The
current value of this constant is <b>Source</b>.
*/
public
void setSource(String source) {
this.source = source.trim();
}
public
String getSource() {
return source;
}
/**
The <code>NTEventLogAppender</code> requires a layout. Hence,
this method always returns <code>true</code>. */
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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