/* * 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.   <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:cstaylor@pacbell.net">Chris Taylor</a>   @author <a href="mailto:jim_cakalic@na.biomerieux.com">Jim Cakalic</a> */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 <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");  }}