public class SimpleLogger extends LegacyAbstractLogger
Simple implementation of Logger
that sends all enabled log messages,
for all defined loggers, to the console (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 false
org.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.showThreadId
-
If you would like to output the current thread id, then set to
true
. Defaults to false
.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.
Modifier and Type | Field and Description |
---|---|
static String |
CACHE_OUTPUT_STREAM_STRING_KEY |
protected int |
currentLogLevel
The current log level
|
static String |
DATE_TIME_FORMAT_KEY |
static String |
DEFAULT_LOG_LEVEL_KEY |
static String |
LEVEL_IN_BRACKETS_KEY |
static String |
LOG_FILE_KEY |
static String |
LOG_KEY_PREFIX |
protected static int |
LOG_LEVEL_DEBUG |
protected static int |
LOG_LEVEL_ERROR |
protected static int |
LOG_LEVEL_INFO |
protected static int |
LOG_LEVEL_OFF |
protected static int |
LOG_LEVEL_TRACE |
protected static int |
LOG_LEVEL_WARN |
static String |
SHOW_DATE_TIME_KEY |
static String |
SHOW_LOG_NAME_KEY |
static String |
SHOW_SHORT_LOG_NAME_KEY |
static String |
SHOW_THREAD_ID_KEY |
static String |
SHOW_THREAD_NAME_KEY |
static String |
SYSTEM_PREFIX
All system properties used by
SimpleLogger start with this
prefix |
static String |
WARN_LEVEL_STRING_KEY |
name
ROOT_LOGGER_NAME
Modifier and Type | Method and Description |
---|---|
protected String |
getFullyQualifiedCallerName() |
protected void |
handleNormalizedLoggingCall(Level level,
Marker marker,
String messagePattern,
Object[] arguments,
Throwable t)
This is our internal implementation for logging regular (non-parameterized)
log messages.
|
boolean |
isDebugEnabled()
Are
debug messages currently enabled? |
boolean |
isErrorEnabled()
Are
error messages currently enabled? |
boolean |
isInfoEnabled()
Are
info messages currently enabled? |
protected boolean |
isLevelEnabled(int logLevel)
Is the given log level currently enabled?
|
boolean |
isTraceEnabled()
Are
trace messages currently enabled? |
boolean |
isWarnEnabled()
Are
warn messages currently enabled? |
void |
log(LoggingEvent event) |
protected void |
writeThrowable(Throwable t,
PrintStream targetStream) |
isDebugEnabled, isErrorEnabled, isInfoEnabled, isTraceEnabled, isWarnEnabled
debug, debug, debug, debug, debug, debug, debug, debug, debug, debug, error, error, error, error, error, error, error, error, error, error, getName, info, info, info, info, info, info, info, info, info, info, readResolve, trace, trace, trace, trace, trace, trace, trace, trace, trace, trace, warn, warn, warn, warn, warn, warn, warn, warn, warn, warn
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
atDebug, atError, atInfo, atLevel, atTrace, atWarn, isEnabledForLevel, makeLoggingEventBuilder
protected static final int LOG_LEVEL_TRACE
protected static final int LOG_LEVEL_DEBUG
protected static final int LOG_LEVEL_INFO
protected static final int LOG_LEVEL_WARN
protected static final int LOG_LEVEL_ERROR
protected static final int LOG_LEVEL_OFF
protected int currentLogLevel
public static final String SYSTEM_PREFIX
SimpleLogger
start with this
prefixpublic static final String LOG_KEY_PREFIX
public static final String CACHE_OUTPUT_STREAM_STRING_KEY
public static final String WARN_LEVEL_STRING_KEY
public static final String LEVEL_IN_BRACKETS_KEY
public static final String LOG_FILE_KEY
public static final String SHOW_SHORT_LOG_NAME_KEY
public static final String SHOW_LOG_NAME_KEY
public static final String SHOW_THREAD_NAME_KEY
public static final String SHOW_THREAD_ID_KEY
public static final String DATE_TIME_FORMAT_KEY
public static final String SHOW_DATE_TIME_KEY
public static final String DEFAULT_LOG_LEVEL_KEY
protected void writeThrowable(Throwable t, PrintStream targetStream)
protected boolean isLevelEnabled(int logLevel)
logLevel
- is this level enabled?public boolean isTraceEnabled()
trace
messages currently enabled?public boolean isDebugEnabled()
debug
messages currently enabled?public boolean isInfoEnabled()
info
messages currently enabled?public boolean isWarnEnabled()
warn
messages currently enabled?public boolean isErrorEnabled()
error
messages currently enabled?protected void handleNormalizedLoggingCall(Level level, Marker marker, String messagePattern, Object[] arguments, Throwable t)
handleNormalizedLoggingCall
in class AbstractLogger
level
- One of the LOG_LEVEL_XXX constants defining the log levelmessage
- The message itselft
- The exception whose stack trace should be loggedpublic void log(LoggingEvent event)
protected String getFullyQualifiedCallerName()
getFullyQualifiedCallerName
in class AbstractLogger
Copyright © 2005–2022 QOS.ch. All rights reserved.