javolution.osgi.internal.LogServiceImpl Maven / Gradle / Ivy
The newest version!
/*
* Javolution - Java(TM) Solution for Real-Time and Embedded Systems
* Copyright (C) 2012 - Javolution (http://javolution.org/)
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software is
* freely granted, provided that this notice is preserved.
*/
package javolution.osgi.internal;
import javolution.util.FastTable;
import org.osgi.framework.ServiceReference;
import org.osgi.service.log.LogService;
/**
* Holds the default implementation of LogService to be used when running
* outside OSGi or when the Javolution bundle is not started.
*/
public final class LogServiceImpl extends Thread implements LogService {
private static class LogEvent {
Throwable exception;
int level;
String message;
}
private final FastTable eventQueue = new FastTable();
public LogServiceImpl() {
super("Logging-Thread");
setDaemon(true);
this.start();
Thread hook = new Thread(new Runnable() {
@Override
public void run() { // Maintains the VM alive until the event queue is flushed
synchronized (eventQueue) {
try {
while (!eventQueue.isEmpty())
eventQueue.wait();
} catch (InterruptedException e) {}
}
}
});
Runtime.getRuntime().addShutdownHook(hook);
}
@Override
public void log(int level, String message) {
log(level, message, null);
}
@Override
public void log(int level, String message, Throwable exception) {
LogEvent event = new LogEvent();
event.level = level;
event.message = message;
event.exception = exception;
synchronized (eventQueue) {
eventQueue.addFirst(event);
eventQueue.notify();
}
}
@SuppressWarnings("rawtypes")
@Override
public void log(ServiceReference sr, int level, String message) {
throw new UnsupportedOperationException();
}
@SuppressWarnings("rawtypes")
@Override
public void log(ServiceReference sr, int level, String message,
Throwable exception) {
throw new UnsupportedOperationException();
}
@Override
public void run() {
while (true) {
try {
LogEvent event;
synchronized (eventQueue) {
while (eventQueue.isEmpty())
eventQueue.wait();
event = eventQueue.pollLast();
eventQueue.notify();
}
switch (event.level) {
case LogService.LOG_DEBUG:
System.out.println("[DEBUG] " + event.message);
break;
case LogService.LOG_INFO:
System.out.println("[INFO] " + event.message);
break;
case LogService.LOG_WARNING:
System.out.println("[WARNING] " + event.message);
break;
case LogService.LOG_ERROR:
System.out.println("[ERROR] " + event.message);
break;
default:
System.out.println("[UNKNOWN] " + event.message);
break;
}
if (event.exception != null) {
event.exception.printStackTrace(System.out);
}
} catch (InterruptedException error) {
error.printStackTrace(System.err);
}
}
}
}