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/****************************************************************************
* Copyright (c) 2005, 2010 Jan S. Rellermeyer, Systems Group,
* Department of Computer Science, ETH Zurich and others.
* 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:
* Jan S. Rellermeyer - initial API and implementation
* Markus Alexander Kuppe - enhancements and bug fixes
*
*****************************************************************************/
package ch.ethz.iks.slp.impl;
import java.util.Dictionary;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceEvent;
import org.osgi.framework.ServiceListener;
import org.osgi.framework.ServiceReference;
import org.osgi.service.log.LogService;
import ch.ethz.iks.slp.impl.filter.Filter;
/**
* Platform abstraction for the OSGi implementation.
*
* @author Jan S. Rellermeyer, ETH Zurich
*/
public class OSGiPlatformAbstraction implements PlatformAbstraction,
ServiceListener {
/**
*
*/
private final BundleContext context;
/**
*
*/
private LogService log = new NullPatternLogService();
/**
* Constructor.
*
* @param context
* the bundle context from the OSGi framework.
* @param log
* the LogService, or null.
* @param debug
* true if debugging is enabled.
* @throws InvalidSyntaxException
* may never happen
*/
OSGiPlatformAbstraction(BundleContext context) throws InvalidSyntaxException {
this.context = context;
// initially get the LogService
final ServiceReference sref = context
.getServiceReference(LogService.class.getName());
if (sref != null) {
this.log = (LogService) context.getService(sref);
}
// track the LogService for life cycle events
context.addServiceListener(this, "(" + Constants.OBJECTCLASS + "=" + LogService.class.getName() + ")");
logDebug("jSLP OSGi started.");
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#createFilter(java.lang.String)
*/
public Filter createFilter(String filterString) {
try {
final org.osgi.framework.Filter filter = context
.createFilter(filterString);
return new Filter() {
public boolean match(Dictionary values) {
return filter.match(values);
}
public String toString() {
return filter.toString();
}
};
} catch (InvalidSyntaxException e) {
throw new IllegalArgumentException(e.getMessage());
}
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#logDebug(java.lang.String)
*/
public void logDebug(String message) {
if(SLPCore.CONFIG.getDebugEnabled()) {
log.log(LogService.LOG_DEBUG, message);
}
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#logDebug(java.lang.String,
* java.lang.Throwable)
*/
public void logDebug(String message, Throwable exception) {
if(SLPCore.CONFIG.getDebugEnabled()) {
log.log(LogService.LOG_DEBUG, message, exception);
}
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#logError(java.lang.String)
*/
public void logError(String message) {
log.log(LogService.LOG_ERROR, message);
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#logError(java.lang.String,
* java.lang.Throwable)
*/
public void logError(String message, Throwable exception) {
log.log(LogService.LOG_ERROR, message, exception);
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#logTraceMessage(java.lang.String)
*/
public void logTraceMessage(String message) {
if(SLPCore.CONFIG.getTraceMessage()) {
log.log(LogService.LOG_INFO, message);
}
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#logTraceDrop(java.lang.String)
*/
public void logTraceDrop(String message) {
if(SLPCore.CONFIG.getTraceDrop()) {
log.log(LogService.LOG_INFO, message);
}
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#logTraceMessage(java.lang.String)
*/
public void logTraceReg(String message) {
if(SLPCore.CONFIG.getTraceReg()) {
log.log(LogService.LOG_INFO, message);
}
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#logWarning(java.lang.String)
*/
public void logWarning(String message) {
log.log(LogService.LOG_WARNING, message);
}
/**
*
* @see ch.ethz.iks.slp.impl.PlatformAbstraction#logWarning(java.lang.String,
* java.lang.Throwable)
*/
public void logWarning(String message, Throwable exception) {
log.log(LogService.LOG_WARNING, message, exception);
}
/**
*
* @see org.osgi.framework.ServiceListener#serviceChanged(org.osgi.framework.ServiceEvent)
*/
public void serviceChanged(final ServiceEvent event) {
switch (event.getType()) {
case ServiceEvent.REGISTERED:
log = (LogService) context.getService(event.getServiceReference());
return;
case ServiceEvent.UNREGISTERING:
log = new NullPatternLogService();
default:
}
}
// if no LogService is present, we use a dummy log
private class NullPatternLogService implements LogService {
public void log(int level, String message) {
if(level == LogService.LOG_ERROR || level == LogService.LOG_WARNING) {
System.err.println(message);
} else {
System.out.println(message);
}
}
public void log(int level, String message, Throwable exception) {
log(level, message + " " + exception.toString());
}
public void log(ServiceReference sr, int level, String message) {
log(null, level, message);
}
public void log(ServiceReference sr, int level, String message, Throwable t) {
log(null, level, message, t);
}
}
}
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