antville/helma
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added getLogger() method and made constructor private to ensure

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there is only one logger per symbolic file name.
This commit is contained in:
hns 2001-09-03 13:03:58 +00:00
parent be7fe1780a
commit 43416e122c
1 changed files with 34 additions and 4 deletions
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38
src/helma/util/Logger.java
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@ -17,6 +17,8 @@ public final class Logger {
static Runner runner;
// the list of active loggers
static ArrayList loggers;
// hash map of loggers
static HashMap loggerMap;
private LinkedList entries;
private String filename;
@ -48,7 +50,7 @@ public final class Logger {
* Create a file logger. The actual file names do have numbers appended and are
* rotated every x bytes.
*/
public Logger (String dirname, String filename) throws IOException {
private Logger (String dirname, String filename) throws IOException {
if (filename == null || dirname == null)
throw new IOException ("Logger can't use null as file or directory name");
this.filename = filename;
@ -68,8 +70,21 @@ public final class Logger {
start (this);
}
/**
* Append a message with to the log.
* Get a logger with a symbolic file name within a directory.
*/
public static synchronized Logger getLogger (String dirname, String filename) throws IOException {
File f = new File (dirname, filename);
Logger log = (Logger) loggerMap.get (f);
if (log == null)
log = new Logger (dirname, filename);
return log;
}
/**
* Append a message to the log.
*/
public void log (String msg) {
// it's enough to render the date every 15 seconds
@ -83,6 +98,16 @@ public final class Logger {
dateCache = dformat.format (new Date());
}
/**
* Return an object which identifies this logger.
*/
public Object getKey () {
if (dirname != null && filename != null)
return new File (dirname, filename);
return null;
}
/**
* This is called by the runner thread to perform actual IO.
*/
@ -134,10 +159,14 @@ public final class Logger {
* runner thread if necessary.
*/
static synchronized void start (Logger log) {
if (loggers == null) {
if (loggers == null)
loggers = new ArrayList ();
}
if (loggerMap == null)
loggerMap = new HashMap ();
loggers.add (log);
loggerMap.put (log.getKey (), log);
if (runner == null || !runner.isAlive ()) {
runner = new Runner ();
runner.setPriority (Thread.NORM_PRIORITY-1);
@ -174,6 +203,7 @@ public final class Logger {
log.run ();
if (log.closed) {
loggers.remove (log);
loggerMap.remove (log.getKey ());
log.closeFiles ();
}
}