org.apache.log4j.nt.NTEventLogAppender Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.log4j.nt;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.Layout;
import org.apache.log4j.TTCCLayout;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LoggingEvent;
/**
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 NTEventLogAppender.dll,
NTEventLogAppender.amd64.dll, NTEventLogAppender.ia64.dll
or NTEventLogAppender.x86.dll as appropriate 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;
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 {
String[] archs;
try {
archs = new String[] { System.getProperty("os.arch")};
} catch(SecurityException e) {
archs = new String[] { "amd64", "ia64", "x86"};
}
boolean loaded = false;
for(int i = 0; i < archs.length; i++) {
try {
System.loadLibrary("NTEventLogAppender." + archs[i]);
loaded = true;
break;
} catch(java.lang.UnsatisfiedLinkError e) {
loaded = false;
}
}
if (!loaded) {
System.loadLibrary("NTEventLogAppender");
}
}
}