/**
* Copyright (c) 2004-2011 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.impl;
import org.slf4j.helpers.FormattingTuple;
import org.slf4j.helpers.MarkerIgnoringBase;
import org.slf4j.helpers.MessageFormatter;
/**
* A simple (and direct) implementation that logs messages of level INFO or
* higher on the console (<code>System.err<code>).
*
* <p>The 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. </p>
*
* <p>Sample output follows.</p>
<pre>
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.
</pre>
*
* @author Ceki Gülcü
*/
public class SimpleLogger extends MarkerIgnoringBase {
private static final long serialVersionUID = -6560244151660620173L;
/**
* Mark the time when this class gets loaded into memory.
*/
private static long startTime = System.currentTimeMillis();
public static final String LINE_SEPARATOR = System
.getProperty("line.separator");
private static String INFO_STR = "INFO";
private static String WARN_STR = "WARN";
private static String ERROR_STR = "ERROR";
/**
* Package access allows only {@link SimpleLoggerFactory} to instantiate
* SimpleLogger instances.
*/
SimpleLogger(String name) {
this.name = name;
}
/**
* Always returns false.
*
* @return always false
*/
public boolean isTraceEnabled() {
return false;
}
/**
* A NOP implementation, as this logger is permanently disabled for the TRACE
* level.
*/
public void trace(String msg) {
// NOP
}
/**
* A NOP implementation, as this logger is permanently disabled for the TRACE
* level.
*/
public void trace(String format, Object param1) {
// NOP
}
/**
* A NOP implementation, as this logger is permanently disabled for the TRACE
* level.
*/
public void trace(String format, Object param1, Object param2) {
// NOP
}
public void trace(String format, Object[] argArray) {
// NOP
}
/**
* A NOP implementation, as this logger is permanently disabled for the TRACE
* level.
*/
public void trace(String msg, Throwable t) {
// NOP
}
/**
* Always returns false.
*
* @return always false
*/
public boolean isDebugEnabled() {
return false;
}
/**
* A NOP implementation, as this logger is permanently disabled for the DEBUG
* level.
*/
public void debug(String msg) {
// NOP
}
/**
* A NOP implementation, as this logger is permanently disabled for the DEBUG
* level.
*/
public void debug(String format, Object param1) {
// NOP
}
/**
* A NOP implementation, as this logger is permanently disabled for the DEBUG
* level.
*/
public void debug(String format, Object param1, Object param2) {
// NOP
}
public void debug(String format, Object[] argArray) {
// NOP
}
/**
* A NOP implementation, as this logger is permanently disabled for the DEBUG
* level.
*/
public void debug(String msg, Throwable t) {
// NOP
}
/**
* This is our internal implementation for logging regular (non-parameterized)
* log messages.
*
* @param level
* @param message
* @param t
*/
private void log(String level, String message, Throwable t) {
StringBuffer buf = new StringBuffer();
long millis = System.currentTimeMillis();
buf.append(millis - startTime);
buf.append(" [");
buf.append(Thread.currentThread().getName());
buf.append("] ");
buf.append(level);
buf.append(" ");
buf.append(name);
buf.append(" - ");
buf.append(message);
buf.append(LINE_SEPARATOR);
System.err.print(buf.toString());
if (t != null) {
t.printStackTrace(System.err);
}
System.err.flush();
}
/**
* For formatted messages, first substitute arguments and then log.
*
* @param level
* @param format
* @param param1
* @param param2
*/
private void formatAndLog(String level, String format, Object arg1,
Object arg2) {
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 argArray
*/
private void formatAndLog(String level, String format, Object[] argArray) {
FormattingTuple tp = MessageFormatter.arrayFormat(format, argArray);
log(level, tp.getMessage(), tp.getThrowable());
}
/**
* Always returns true.
*/
public boolean isInfoEnabled() {
return true;
}
/**
* A simple implementation which always logs messages of level INFO according
* to the format outlined above.
*/
public void info(String msg) {
log(INFO_STR, msg, null);
}
/**
* Perform single parameter substitution before logging the message of level
* INFO according to the format outlined above.
*/
public void info(String format, Object arg) {
formatAndLog(INFO_STR, format, arg, null);
}
/**
* Perform double parameter substitution before logging the message of level
* INFO according to the format outlined above.
*/
public void info(String format, Object arg1, Object arg2) {
formatAndLog(INFO_STR, format, arg1, arg2);
}
/**
* Perform double parameter substitution before logging the message of level
* INFO according to the format outlined above.
*/
public void info(String format, Object[] argArray) {
formatAndLog(INFO_STR, format, argArray);
}
/**
* Log a message of level INFO, including an exception.
*/
public void info(String msg, Throwable t) {
log(INFO_STR, msg, t);
}
/**
* Always returns true.
*/
public boolean isWarnEnabled() {
return true;
}
/**
* A simple implementation which always logs messages of level WARN according
* to the format outlined above.
*/
public void warn(String msg) {
log(WARN_STR, msg, null);
}
/**
* Perform single parameter substitution before logging the message of level
* WARN according to the format outlined above.
*/
public void warn(String format, Object arg) {
formatAndLog(WARN_STR, format, arg, null);
}
/**
* Perform double parameter substitution before logging the message of level
* WARN according to the format outlined above.
*/
public void warn(String format, Object arg1, Object arg2) {
formatAndLog(WARN_STR, format, arg1, arg2);
}
/**
* Perform double parameter substitution before logging the message of level
* WARN according to the format outlined above.
*/
public void warn(String format, Object[] argArray) {
formatAndLog(WARN_STR, format, argArray);
}
/**
* Log a message of level WARN, including an exception.
*/
public void warn(String msg, Throwable t) {
log(WARN_STR, msg, t);
}
/**
* Always returns true.
*/
public boolean isErrorEnabled() {
return true;
}
/**
* A simple implementation which always logs messages of level ERROR according
* to the format outlined above.
*/
public void error(String msg) {
log(ERROR_STR, msg, null);
}
/**
* Perform single parameter substitution before logging the message of level
* ERROR according to the format outlined above.
*/
public void error(String format, Object arg) {
formatAndLog(ERROR_STR, format, arg, null);
}
/**
* Perform double parameter substitution before logging the message of level
* ERROR according to the format outlined above.
*/
public void error(String format, Object arg1, Object arg2) {
formatAndLog(ERROR_STR, format, arg1, arg2);
}
/**
* Perform double parameter substitution before logging the message of level
* ERROR according to the format outlined above.
*/
public void error(String format, Object[] argArray) {
formatAndLog(ERROR_STR, format, argArray);
}
/**
* Log a message of level ERROR, including an exception.
*/
public void error(String msg, Throwable t) {
log(ERROR_STR, msg, t);
}
}