org.slf4j.simple.SimpleLogger Maven / Gradle / Ivy
/**
* Copyright (c) 2004-2021 QOS.ch
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
package org.slf4j.simple;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.Marker;
import org.slf4j.event.Level;
import org.slf4j.event.LoggingEvent;
import org.slf4j.helpers.LegacyAbstractLogger;
import org.slf4j.helpers.MessageFormatter;
import org.slf4j.helpers.NormalizedParameters;
import org.slf4j.spi.LocationAwareLogger;
/**
*
* Simple implementation of {@link Logger} that sends all enabled log messages,
* for all defined loggers, to the console ({@code System.err}). The following
* system properties are supported to configure the behavior of this logger:
*
*
*
* org.slf4j.simpleLogger.logFile - The output target which can
* be the path to a file, or the special values "System.out" and
* "System.err". Default is "System.err".org.slf4j.simpleLogger.cacheOutputStream - If the output
* target is set to "System.out" or "System.err" (see preceding entry), by
* default, logs will be output to the latest value referenced by
* System.out/err variables. By setting this parameter to true, the
* output stream will be cached, i.e. assigned once at initialization time and
* re-used independently of the current value referenced by
* System.out/err.org.slf4j.simpleLogger.defaultLogLevel - Default log level
* for all instances of SimpleLogger. Must be one of ("trace", "debug", "info",
* "warn", "error" or "off"). If not specified, defaults to "info".org.slf4j.simpleLogger.log.a.b.c - Logging detail
* level for a SimpleLogger instance named "a.b.c". Right-side value must be one
* of "trace", "debug", "info", "warn", "error" or "off". When a SimpleLogger
* named "a.b.c" is initialized, its level is assigned from this property. If
* unspecified, the level of nearest parent logger will be used, and if none is
* set, then the value specified by
* org.slf4j.simpleLogger.defaultLogLevel will be used.org.slf4j.simpleLogger.showDateTime - Set to
* true if you want the current date and time to be included in
* output messages. Default is falseorg.slf4j.simpleLogger.dateTimeFormat - The date and time
* format to be used in the output messages. The pattern describing the date and
* time format is defined by
* SimpleDateFormat. If the format is not specified or is
* invalid, the number of milliseconds since start up will be output.org.slf4j.simpleLogger.showThreadName -Set to
* true if you want to output the current thread name. Defaults to
* true.org.slf4j.simpleLogger.showLogName - Set to
* true if you want the Logger instance name to be included in
* output messages. Defaults to true.org.slf4j.simpleLogger.showShortLogName - Set to
* true if you want the last component of the name to be included
* in output messages. Defaults to false.org.slf4j.simpleLogger.levelInBrackets - Should the level
* string be output in brackets? Defaults to false.org.slf4j.simpleLogger.warnLevelString - The string value
* output for the warn level. Defaults to WARN.
*
*
* In addition to looking for system properties with the names specified above,
* this implementation also checks for a class loader resource named
* "simplelogger.properties", and includes any matching definitions
* from this resource (if it exists).
*
*
*
* With no configuration, the default output includes the relative time in
* milliseconds, thread name, the level, logger name, and the message followed
* by the line separator for the host. In log4j terms it amounts to the "%r [%t]
* %level %logger - %m%n" pattern.
*
*
* Sample output follows.
*
*
*
* 176 [main] INFO examples.Sort - Populating an array of 2 elements in reverse order.
* 225 [main] INFO examples.SortAlgo - Entered the sort method.
* 304 [main] INFO examples.SortAlgo - Dump of integer array:
* 317 [main] INFO examples.SortAlgo - Element [0] = 0
* 331 [main] INFO examples.SortAlgo - Element [1] = 1
* 343 [main] INFO examples.Sort - The next log statement should be an error message.
* 346 [main] ERROR examples.SortAlgo - Tried to dump an uninitialized array.
* at org.log4j.examples.SortAlgo.dump(SortAlgo.java:58)
* at org.log4j.examples.Sort.main(Sort.java:64)
* 467 [main] INFO examples.Sort - Exiting main method.
*
*
*
* This implementation is heavily inspired by
* Apache Commons Logging's
* SimpleLog.
*
*
* @author Ceki Gülcü
* @author Scott Sanders
* @author Rod Waldhoff
* @author Robert Burrell Donkin
* @author Cédrik LIME
*/
public class SimpleLogger extends LegacyAbstractLogger {
private static final long serialVersionUID = -632788891211436180L;
private static long START_TIME = System.currentTimeMillis();
protected static final int LOG_LEVEL_TRACE = LocationAwareLogger.TRACE_INT;
protected static final int LOG_LEVEL_DEBUG = LocationAwareLogger.DEBUG_INT;
protected static final int LOG_LEVEL_INFO = LocationAwareLogger.INFO_INT;
protected static final int LOG_LEVEL_WARN = LocationAwareLogger.WARN_INT;
protected static final int LOG_LEVEL_ERROR = LocationAwareLogger.ERROR_INT;
static char SP = ' ';
// The OFF level can only be used in configuration files to disable logging.
// It has
// no printing method associated with it in o.s.Logger interface.
protected static final int LOG_LEVEL_OFF = LOG_LEVEL_ERROR + 10;
private static boolean INITIALIZED = false;
static final SimpleLoggerConfiguration CONFIG_PARAMS = new SimpleLoggerConfiguration();
static void lazyInit() {
if (INITIALIZED) {
return;
}
INITIALIZED = true;
init();
}
// external software might be invoking this method directly. Do not rename
// or change its semantics.
static void init() {
CONFIG_PARAMS.init();
}
/** The current log level */
protected int currentLogLevel = LOG_LEVEL_INFO;
/** The short name of this simple log instance */
private transient String shortLogName = null;
/**
* All system properties used by SimpleLogger start with this
* prefix
*/
public static final String SYSTEM_PREFIX = "org.slf4j.simpleLogger.";
public static final String LOG_KEY_PREFIX = SimpleLogger.SYSTEM_PREFIX + "log.";
public static final String CACHE_OUTPUT_STREAM_STRING_KEY = SimpleLogger.SYSTEM_PREFIX + "cacheOutputStream";
public static final String WARN_LEVEL_STRING_KEY = SimpleLogger.SYSTEM_PREFIX + "warnLevelString";
public static final String LEVEL_IN_BRACKETS_KEY = SimpleLogger.SYSTEM_PREFIX + "levelInBrackets";
public static final String LOG_FILE_KEY = SimpleLogger.SYSTEM_PREFIX + "logFile";
public static final String SHOW_SHORT_LOG_NAME_KEY = SimpleLogger.SYSTEM_PREFIX + "showShortLogName";
public static final String SHOW_LOG_NAME_KEY = SimpleLogger.SYSTEM_PREFIX + "showLogName";
public static final String SHOW_THREAD_NAME_KEY = SimpleLogger.SYSTEM_PREFIX + "showThreadName";
public static final String DATE_TIME_FORMAT_KEY = SimpleLogger.SYSTEM_PREFIX + "dateTimeFormat";
public static final String SHOW_DATE_TIME_KEY = SimpleLogger.SYSTEM_PREFIX + "showDateTime";
public static final String DEFAULT_LOG_LEVEL_KEY = SimpleLogger.SYSTEM_PREFIX + "defaultLogLevel";
/**
* Package access allows only {@link SimpleLoggerFactory} to instantiate
* SimpleLogger instances.
*/
SimpleLogger(String name) {
this.name = name;
String levelString = recursivelyComputeLevelString();
if (levelString != null) {
this.currentLogLevel = SimpleLoggerConfiguration.stringToLevel(levelString);
} else {
this.currentLogLevel = CONFIG_PARAMS.defaultLogLevel;
}
}
String recursivelyComputeLevelString() {
String tempName = name;
String levelString = null;
int indexOfLastDot = tempName.length();
while ((levelString == null) && (indexOfLastDot > -1)) {
tempName = tempName.substring(0, indexOfLastDot);
levelString = CONFIG_PARAMS.getStringProperty(SimpleLogger.LOG_KEY_PREFIX + tempName, null);
indexOfLastDot = String.valueOf(tempName).lastIndexOf(".");
}
return levelString;
}
/**
* To avoid intermingling of log messages and associated stack traces, the two
* operations are done in a synchronized block.
*
* @param buf
* @param t
*/
void write(StringBuilder buf, Throwable t) {
PrintStream targetStream = CONFIG_PARAMS.outputChoice.getTargetPrintStream();
synchronized (CONFIG_PARAMS) {
targetStream.println(buf.toString());
writeThrowable(t, targetStream);
targetStream.flush();
}
}
protected void writeThrowable(Throwable t, PrintStream targetStream) {
if (t != null) {
t.printStackTrace(targetStream);
}
}
private String getFormattedDate() {
Date now = new Date();
String dateText;
synchronized (CONFIG_PARAMS.dateFormatter) {
dateText = CONFIG_PARAMS.dateFormatter.format(now);
}
return dateText;
}
private String computeShortName() {
return name.substring(name.lastIndexOf(".") + 1);
}
// /**
// * For formatted messages, first substitute arguments and then log.
// *
// * @param level
// * @param format
// * @param arg1
// * @param arg2
// */
// private void formatAndLog(int level, String format, Object arg1, Object arg2) {
// if (!isLevelEnabled(level)) {
// return;
// }
// FormattingTuple tp = MessageFormatter.format(format, arg1, arg2);
// log(level, tp.getMessage(), tp.getThrowable());
// }
// /**
// * For formatted messages, first substitute arguments and then log.
// *
// * @param level
// * @param format
// * @param arguments
// * a list of 3 ore more arguments
// */
// private void formatAndLog(int level, String format, Object... arguments) {
// if (!isLevelEnabled(level)) {
// return;
// }
// FormattingTuple tp = MessageFormatter.arrayFormat(format, arguments);
// log(level, tp.getMessage(), tp.getThrowable());
// }
/**
* Is the given log level currently enabled?
*
* @param logLevel is this level enabled?
* @return whether the logger is enabled for the given level
*/
protected boolean isLevelEnabled(int logLevel) {
// log level are numerically ordered so can use simple numeric
// comparison
return (logLevel >= currentLogLevel);
}
/** Are {@code trace} messages currently enabled? */
public boolean isTraceEnabled() {
return isLevelEnabled(LOG_LEVEL_TRACE);
}
/** Are {@code debug} messages currently enabled? */
public boolean isDebugEnabled() {
return isLevelEnabled(LOG_LEVEL_DEBUG);
}
/** Are {@code info} messages currently enabled? */
public boolean isInfoEnabled() {
return isLevelEnabled(LOG_LEVEL_INFO);
}
/** Are {@code warn} messages currently enabled? */
public boolean isWarnEnabled() {
return isLevelEnabled(LOG_LEVEL_WARN);
}
/** Are {@code error} messages currently enabled? */
public boolean isErrorEnabled() {
return isLevelEnabled(LOG_LEVEL_ERROR);
}
/**
* This is our internal implementation for logging regular (non-parameterized)
* log messages.
*
* @param level One of the LOG_LEVEL_XXX constants defining the log level
* @param message The message itself
* @param t The exception whose stack trace should be logged
*/
@Override
protected void handleNormalizedLoggingCall(Level level, Marker marker, String messagePattern, Object[] arguments, Throwable t) {
List markers = null;
if (marker != null) {
markers = new ArrayList();
markers.add(marker);
}
innerHandleNormalizedLoggingCall(level, markers, messagePattern, arguments, t);
}
private void innerHandleNormalizedLoggingCall(Level level, List markers, String messagePattern, Object[] arguments, Throwable t) {
StringBuilder buf = new StringBuilder(32);
// Append date-time if so configured
if (CONFIG_PARAMS.showDateTime) {
if (CONFIG_PARAMS.dateFormatter != null) {
buf.append(getFormattedDate());
buf.append(' ');
} else {
buf.append(System.currentTimeMillis() - START_TIME);
buf.append(' ');
}
}
// Append current thread name if so configured
if (CONFIG_PARAMS.showThreadName) {
buf.append('[');
buf.append(Thread.currentThread().getName());
buf.append("] ");
}
if (CONFIG_PARAMS.levelInBrackets)
buf.append('[');
// Append a readable representation of the log level
String levelStr = level.name();
buf.append(levelStr);
if (CONFIG_PARAMS.levelInBrackets)
buf.append(']');
buf.append(' ');
// Append the name of the log instance if so configured
if (CONFIG_PARAMS.showShortLogName) {
if (shortLogName == null)
shortLogName = computeShortName();
buf.append(String.valueOf(shortLogName)).append(" - ");
} else if (CONFIG_PARAMS.showLogName) {
buf.append(String.valueOf(name)).append(" - ");
}
if (markers != null) {
buf.append(SP);
for (Marker marker : markers) {
buf.append(marker.getName()).append(SP);
}
}
String formattedMessage = MessageFormatter.basicArrayFormat(messagePattern, arguments);
// Append the message
buf.append(formattedMessage);
write(buf, t);
}
public void log(LoggingEvent event) {
int levelInt = event.getLevel().toInt();
if (!isLevelEnabled(levelInt)) {
return;
}
NormalizedParameters np = NormalizedParameters.normalize(event);
innerHandleNormalizedLoggingCall(event.getLevel(), event.getMarkers(), np.getMessage(), np.getArguments(), event.getThrowable());
}
@Override
protected String getFullyQualifiedCallerName() {
return null;
}
}