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/*******************************************************************************
* Copyright (c) 1998, 2005 IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.device;
import java.io.PrintStream;
import java.text.DateFormat;
import java.util.Calendar;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.log.LogService;
import org.osgi.util.tracker.ServiceTracker;
/**
* LogTracker class. This class encapsulates the LogService
* and handles all issues such as the service coming and going.
*/
public class LogTracker extends ServiceTracker implements LogService {
/** LogService interface class name */
protected final static String clazz = "org.osgi.service.log.LogService"; //$NON-NLS-1$
/** PrintStream to use if LogService is unavailable */
protected PrintStream out;
/** Calendar and DateFormat to user if LogService is unavailable */
private static Calendar calendar;
private static DateFormat dateFormat;
private String timestamp;
/**
* Create new LogTracker.
*
* @param context BundleContext of parent bundle.
* @param out Default PrintStream to use if LogService is unavailable.
*/
public LogTracker(BundleContext context, PrintStream out) {
super(context, clazz, null);
this.out = out;
calendar = Calendar.getInstance();
dateFormat = DateFormat.getDateTimeInstance();
open();
}
/*
* ----------------------------------------------------------------------
* LogService Interface implementation
* ----------------------------------------------------------------------
*/
public void log(int level, String message) {
log(null, level, message, null);
}
public void log(int level, String message, Throwable exception) {
log(null, level, message, exception);
}
public void log(ServiceReference reference, int level, String message) {
log(reference, level, message, null);
}
public synchronized void log(ServiceReference reference, int level, String message, Throwable exception) {
ServiceReference[] references = getServiceReferences();
if (references != null) {
int size = references.length;
for (int i = 0; i < size; i++) {
LogService service = (LogService) getService(references[i]);
if (service != null) {
try {
service.log(reference, level, message, exception);
} catch (Exception e) {
// do nothing
}
}
}
return;
}
noLogService(level, message, exception, reference);
}
/**
* The LogService is not available so we write the message to a PrintStream.
*
* @param level Logging level
* @param message Log message.
* @param throwable Log exception or null if none.
* @param reference ServiceReference associated with message or null if none.
*/
protected void noLogService(int level, String message, Throwable throwable, ServiceReference reference) {
if (out != null) {
synchronized (out) {
// Bug #113286. If no log service present and messages are being
// printed to stdout, prepend message with a timestamp.
timestamp = dateFormat.format(calendar.getTime());
out.print(timestamp + " "); //$NON-NLS-1$
switch (level) {
case LOG_DEBUG : {
out.print("Debug: "); //$NON-NLS-1$
break;
}
case LOG_INFO : {
out.print(LogTrackerMsg.Info);
break;
}
case LOG_WARNING : {
out.print(LogTrackerMsg.Warning);
break;
}
case LOG_ERROR : {
out.print(LogTrackerMsg.Error);
break;
}
default : {
out.print("["); //$NON-NLS-1$
out.print(LogTrackerMsg.Unknown_Log_level);
out.print("]: "); //$NON-NLS-1$
break;
}
}
out.println(message);
if (reference != null) {
out.println(reference);
}
if (throwable != null) {
throwable.printStackTrace(out);
}
}
}
}
}
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