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A fork of Apache Log4j v1 with security patches, and repackaged as `io.confluent:confluent-log4j`
/*
* 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.lf5;
import java.awt.Toolkit;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.lf5.viewer.LogBrokerMonitor;
import org.apache.log4j.spi.LocationInfo;
import org.apache.log4j.spi.LoggingEvent;
/**
* LF5Appender logs events to a swing based logging
* console. The swing console supports turning categories on and off,
* multiple detail level views, as well as full text searching and many
* other capabilties.
*
* @author Brent Sprecher
*/
// Contributed by ThoughtWorks Inc.
public class LF5Appender extends AppenderSkeleton {
//--------------------------------------------------------------------------
// Constants:
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Protected Variables:
//--------------------------------------------------------------------------
protected LogBrokerMonitor _logMonitor;
protected static LogBrokerMonitor _defaultLogMonitor;
protected static AppenderFinalizer _finalizer;
//--------------------------------------------------------------------------
// Private Variables:
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Constructors:
//--------------------------------------------------------------------------
/**
* Constructs a LF5Appender using the default instance of
* the LogBrokerMonitor. This constructor should always
* be preferred over the
* LF5Appender(LogBrokerMonitor monitor)
* constructor, unless you need to spawn additional log monitoring
* windows.
*/
public LF5Appender() {
this(getDefaultInstance());
}
/**
* Constructs a LF5Appender using an instance of
* a LogBrokerMonitor supplied by the user. This
* constructor should only be used when you need to spawn
* additional log monitoring windows.
*
* @param monitor An instance of a LogBrokerMonitor
* created by the user.
*/
public LF5Appender(LogBrokerMonitor monitor) {
if (monitor != null) {
_logMonitor = monitor;
}
}
//--------------------------------------------------------------------------
// Public Methods:
//--------------------------------------------------------------------------
/**
* Appends a LoggingEvent record to the
* LF5Appender.
* @param event The LoggingEvent
* to be appended.
*/
public void append(LoggingEvent event) {
// Retrieve the information from the log4j LoggingEvent.
String category = event.getLoggerName();
String logMessage = event.getRenderedMessage();
String nestedDiagnosticContext = event.getNDC();
String threadDescription = event.getThreadName();
String level = event.getLevel().toString();
long time = event.timeStamp;
LocationInfo locationInfo = event.getLocationInformation();
// Add the logging event information to a LogRecord
Log4JLogRecord record = new Log4JLogRecord();
record.setCategory(category);
record.setMessage(logMessage);
record.setLocation(locationInfo.fullInfo);
record.setMillis(time);
record.setThreadDescription(threadDescription);
if (nestedDiagnosticContext != null) {
record.setNDC(nestedDiagnosticContext);
} else {
record.setNDC("");
}
if (event.getThrowableInformation() != null) {
record.setThrownStackTrace(event.getThrowableInformation());
}
try {
record.setLevel(LogLevel.valueOf(level));
} catch (LogLevelFormatException e) {
// If the priority level doesn't match one of the predefined
// log levels, then set the level to warning.
record.setLevel(LogLevel.WARN);
}
if (_logMonitor != null) {
_logMonitor.addMessage(record);
}
}
/**
* This method is an empty implementation of the close() method inherited
* from the org.apache.log4j.Appender interface.
*/
public void close() {
}
/**
* Returns a value that indicates whether this appender requires a
* Layout. This method always returns false.
* No layout is required for the LF5Appender.
*/
public boolean requiresLayout() {
return false;
}
/**
* This method is used to set the property that controls whether
* the LogBrokerMonitor is hidden or closed when a user
* exits
* the monitor. By default, the LogBrokerMonitor will hide
* itself when the log window is exited, and the swing thread will
* continue to run in the background. If this property is
* set to true, the LogBrokerMonitor will call System.exit(0)
* and will shut down swing thread and the virtual machine.
*
* @param callSystemExitOnClose A boolean value indicating whether
* to call System.exit(0) when closing the log window.
*/
public void setCallSystemExitOnClose(boolean callSystemExitOnClose) {
_logMonitor.setCallSystemExitOnClose(callSystemExitOnClose);
}
/**
* The equals method compares two LF5Appenders and determines whether
* they are equal. Two Appenders will be considered equal
* if, and only if, they both contain references to the same
* LogBrokerMonitor.
*
* @param compareTo A boolean value indicating whether
* the two LF5Appenders are equal.
*/
public boolean equals(LF5Appender compareTo) {
// If both reference the same LogBrokerMonitor, they are equal.
return _logMonitor == compareTo.getLogBrokerMonitor();
}
public LogBrokerMonitor getLogBrokerMonitor() {
return _logMonitor;
}
public static void main(String[] args) {
new LF5Appender();
}
public void setMaxNumberOfRecords(int maxNumberOfRecords) {
_defaultLogMonitor.setMaxNumberOfLogRecords(maxNumberOfRecords);
}
//--------------------------------------------------------------------------
// Protected Methods:
//--------------------------------------------------------------------------
/**
* @return The default instance of the LogBrokerMonitor.
*/
protected static synchronized LogBrokerMonitor getDefaultInstance() {
if (_defaultLogMonitor == null) {
try {
_defaultLogMonitor =
new LogBrokerMonitor(LogLevel.getLog4JLevels());
_finalizer = new AppenderFinalizer(_defaultLogMonitor);
_defaultLogMonitor.setFrameSize(getDefaultMonitorWidth(),
getDefaultMonitorHeight());
_defaultLogMonitor.setFontSize(12);
_defaultLogMonitor.show();
} catch (SecurityException e) {
_defaultLogMonitor = null;
}
}
return _defaultLogMonitor;
}
/**
* @return the screen width from Toolkit.getScreenSize()
* if possible, otherwise returns 800
* @see java.awt.Toolkit
*/
protected static int getScreenWidth() {
try {
return Toolkit.getDefaultToolkit().getScreenSize().width;
} catch (Throwable t) {
return 800;
}
}
/**
* @return the screen height from Toolkit.getScreenSize()
* if possible, otherwise returns 600
* @see java.awt.Toolkit
*/
protected static int getScreenHeight() {
try {
return Toolkit.getDefaultToolkit().getScreenSize().height;
} catch (Throwable t) {
return 600;
}
}
protected static int getDefaultMonitorWidth() {
return (3 * getScreenWidth()) / 4;
}
protected static int getDefaultMonitorHeight() {
return (3 * getScreenHeight()) / 4;
}
//--------------------------------------------------------------------------
// Private Methods:
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------
// Nested Top-Level Classes or Interfaces:
//--------------------------------------------------------------------------
}
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