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Now doesn't create a gazillion runnable threads, just one. Better log…
…ging.
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package main; | ||
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import java.io.PrintWriter; | ||
import java.io.StringWriter; | ||
import java.util.Date; | ||
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/** A low overhead, lightweight logging system. | ||
* @author Nathan Sweet <misc@n4te.com> */ | ||
public class Log { | ||
/** No logging at all. */ | ||
static public final int LEVEL_NONE = 6; | ||
/** Critical errors. The application may no longer work correctly. */ | ||
static public final int LEVEL_ERROR = 5; | ||
/** Important warnings. The application will continue to work correctly. */ | ||
static public final int LEVEL_WARN = 4; | ||
/** Informative messages. Typically used for deployment. */ | ||
static public final int LEVEL_INFO = 3; | ||
/** Debug messages. This level is useful during development. */ | ||
static public final int LEVEL_DEBUG = 2; | ||
/** Trace messages. A lot of information is logged, so this level is usually only needed when debugging a problem. */ | ||
static public final int LEVEL_TRACE = 1; | ||
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/** The level of messages that will be logged. Compiling this and the booleans below as "final" will cause the compiler to | ||
* remove all "if (Log.info) ..." type statements below the set level. */ | ||
static private int level = LEVEL_INFO; | ||
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/** True when the ERROR level will be logged. */ | ||
static public boolean ERROR = level <= LEVEL_ERROR; | ||
/** True when the WARN level will be logged. */ | ||
static public boolean WARN = level <= LEVEL_WARN; | ||
/** True when the INFO level will be logged. */ | ||
static public boolean INFO = level <= LEVEL_INFO; | ||
/** True when the DEBUG level will be logged. */ | ||
static public boolean DEBUG = level <= LEVEL_DEBUG; | ||
/** True when the TRACE level will be logged. */ | ||
static public boolean TRACE = level <= LEVEL_TRACE; | ||
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/** Sets the level to log. If a version of this class is being used that has a final log level, this has no affect. */ | ||
static public void set (int level) { | ||
// Comment out method contents when compiling fixed level JARs. | ||
Log.level = level; | ||
ERROR = level <= LEVEL_ERROR; | ||
WARN = level <= LEVEL_WARN; | ||
INFO = level <= LEVEL_INFO; | ||
DEBUG = level <= LEVEL_DEBUG; | ||
TRACE = level <= LEVEL_TRACE; | ||
} | ||
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static public void NONE () { | ||
set(LEVEL_NONE); | ||
} | ||
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static public void ERROR () { | ||
set(LEVEL_ERROR); | ||
} | ||
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static public void WARN () { | ||
set(LEVEL_WARN); | ||
} | ||
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static public void INFO () { | ||
set(LEVEL_INFO); | ||
} | ||
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static public void DEBUG () { | ||
set(LEVEL_DEBUG); | ||
} | ||
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static public void TRACE () { | ||
set(LEVEL_TRACE); | ||
} | ||
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/** Sets the logger that will write the log messages. */ | ||
static public void setLogger (Logger logger) { | ||
Log.logger = logger; | ||
} | ||
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static private Logger logger = new Logger(); | ||
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static public void error (String message, Throwable ex) { | ||
if (ERROR) logger.log(LEVEL_ERROR, null, message, ex); | ||
} | ||
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static public void error (String category, String message, Throwable ex) { | ||
if (ERROR) logger.log(LEVEL_ERROR, category, message, ex); | ||
} | ||
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static public void error (String message) { | ||
if (ERROR) logger.log(LEVEL_ERROR, null, message, null); | ||
} | ||
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static public void error (String category, String message) { | ||
if (ERROR) logger.log(LEVEL_ERROR, category, message, null); | ||
} | ||
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static public void warn (String message, Throwable ex) { | ||
if (WARN) logger.log(LEVEL_WARN, null, message, ex); | ||
} | ||
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static public void warn (String category, String message, Throwable ex) { | ||
if (WARN) logger.log(LEVEL_WARN, category, message, ex); | ||
} | ||
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static public void warn (String message) { | ||
if (WARN) logger.log(LEVEL_WARN, null, message, null); | ||
} | ||
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static public void warn (String category, String message) { | ||
if (WARN) logger.log(LEVEL_WARN, category, message, null); | ||
} | ||
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static public void info (String message, Throwable ex) { | ||
if (INFO) logger.log(LEVEL_INFO, null, message, ex); | ||
} | ||
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static public void info (String category, String message, Throwable ex) { | ||
if (INFO) logger.log(LEVEL_INFO, category, message, ex); | ||
} | ||
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static public void info (String message) { | ||
if (INFO) logger.log(LEVEL_INFO, null, message, null); | ||
} | ||
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static public void info (String category, String message) { | ||
if (INFO) logger.log(LEVEL_INFO, category, message, null); | ||
} | ||
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static public void debug (String message, Throwable ex) { | ||
if (DEBUG) logger.log(LEVEL_DEBUG, null, message, ex); | ||
} | ||
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static public void debug (String category, String message, Throwable ex) { | ||
if (DEBUG) logger.log(LEVEL_DEBUG, category, message, ex); | ||
} | ||
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static public void debug (String message) { | ||
if (DEBUG) logger.log(LEVEL_DEBUG, null, message, null); | ||
} | ||
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static public void debug (String category, String message) { | ||
if (DEBUG) logger.log(LEVEL_DEBUG, category, message, null); | ||
} | ||
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static public void trace (String message, Throwable ex) { | ||
if (TRACE) logger.log(LEVEL_TRACE, null, message, ex); | ||
} | ||
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static public void trace (String category, String message, Throwable ex) { | ||
if (TRACE) logger.log(LEVEL_TRACE, category, message, ex); | ||
} | ||
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static public void trace (String message) { | ||
if (TRACE) logger.log(LEVEL_TRACE, null, message, null); | ||
} | ||
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static public void trace (String category, String message) { | ||
if (TRACE) logger.log(LEVEL_TRACE, category, message, null); | ||
} | ||
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private Log () { | ||
} | ||
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/** Performs the actual logging. Default implementation logs to System.out. Extended and use {@link Log#logger} set to handle | ||
* logging differently. */ | ||
static public class Logger { | ||
private long firstLogTime = new Date().getTime(); | ||
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public void log (int level, String category, String message, Throwable ex) { | ||
StringBuilder builder = new StringBuilder(256); | ||
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long time = new Date().getTime() - firstLogTime; | ||
long minutes = time / (1000 * 60); | ||
long seconds = time / (1000) % 60; | ||
if (minutes <= 9) builder.append('0'); | ||
builder.append(minutes); | ||
builder.append(':'); | ||
if (seconds <= 9) builder.append('0'); | ||
builder.append(seconds); | ||
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switch (level) { | ||
case LEVEL_ERROR: | ||
builder.append(" ERROR: "); | ||
break; | ||
case LEVEL_WARN: | ||
builder.append(" WARN: "); | ||
break; | ||
case LEVEL_INFO: | ||
builder.append(" INFO: "); | ||
break; | ||
case LEVEL_DEBUG: | ||
builder.append(" DEBUG: "); | ||
break; | ||
case LEVEL_TRACE: | ||
builder.append(" TRACE: "); | ||
break; | ||
} | ||
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if (category != null) { | ||
builder.append('['); | ||
builder.append(category); | ||
builder.append("] "); | ||
} | ||
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builder.append(message); | ||
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if (ex != null) { | ||
StringWriter writer = new StringWriter(256); | ||
ex.printStackTrace(new PrintWriter(writer)); | ||
builder.append('\n'); | ||
builder.append(writer.toString().trim()); | ||
} | ||
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print(builder.toString()); | ||
} | ||
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/** Prints the message to System.out. Called by the default implementation of {@link #log(int, String, String, Throwable)}. */ | ||
protected void print (String message) { | ||
System.out.println(message); | ||
} | ||
} | ||
} |
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