/****************************************************************************
* Copyright (c) 2004 Composent, Inc. 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:
* Composent, Inc. - initial API and implementation
*****************************************************************************/
package org.eclipse.ecf.internal.provider.jmdns;
import java.util.Properties;
import org.eclipse.core.runtime.IAdapterManager;
import org.eclipse.core.runtime.SafeRunner;
import org.eclipse.ecf.core.*;
import org.eclipse.ecf.core.identity.IDCreateException;
import org.eclipse.ecf.core.identity.Namespace;
import org.eclipse.ecf.core.util.*;
import org.eclipse.ecf.discovery.IDiscoveryAdvertiser;
import org.eclipse.ecf.discovery.IDiscoveryLocator;
import org.eclipse.ecf.discovery.service.IDiscoveryService;
import org.eclipse.ecf.provider.jmdns.container.ContainerInstantiator;
import org.eclipse.ecf.provider.jmdns.container.JMDNSDiscoveryContainer;
import org.eclipse.ecf.provider.jmdns.identity.JMDNSNamespace;
import org.osgi.framework.*;
import org.osgi.service.log.LogService;
import org.osgi.util.tracker.ServiceTracker;
/**
* The main plugin class to be used in the desktop.
*/
public class JMDNSPlugin implements BundleActivator {
public static final String NAME = "ecf.discovery.jmdns"; //$NON-NLS-1$
// The shared instance.
private static JMDNSPlugin plugin;
private BundleContext context = null;
public static final String PLUGIN_ID = "org.eclipse.ecf.provider.jmdns"; //$NON-NLS-1$
/**
* The constructor.
*/
public JMDNSPlugin() {
super();
plugin = this;
}
private AdapterManagerTracker adapterManagerTracker = null;
private ServiceRegistration serviceRegistration;
private ServiceTracker logServiceTracker = null;
private LogService logService = null;
public IAdapterManager getAdapterManager() {
// First, try to get the adapter manager via
if (adapterManagerTracker == null) {
adapterManagerTracker = new AdapterManagerTracker(this.context);
adapterManagerTracker.open();
}
return adapterManagerTracker.getAdapterManager();
}
/**
* This method is called upon plug-in activation
*/
public void start(final BundleContext ctxt) throws Exception {
this.context = ctxt;
final Properties props = new Properties();
props.put(IDiscoveryService.CONTAINER_NAME, NAME);
props.put(Constants.SERVICE_RANKING, new Integer(750));
String[] clazzes = new String[] {IDiscoveryService.class.getName(), IDiscoveryLocator.class.getName(), IDiscoveryAdvertiser.class.getName()};
serviceRegistration = context.registerService(clazzes, serviceFactory, props);
SafeRunner.run(new ExtensionRegistryRunnable(ctxt) {
protected void runWithoutRegistry() throws Exception {
ctxt.registerService(Namespace.class, new JMDNSNamespace("JMDNS Discovery Namespace"), null);
ctxt.registerService(ContainerTypeDescription.class, new ContainerTypeDescription(ContainerInstantiator.JMDNS_CONTAINER_NAME, new ContainerInstantiator(), "JMDNS Discovery Container", true, false), null);
ctxt.registerService(ContainerTypeDescription.class, new ContainerTypeDescription(ContainerInstantiator.JMDNS_LOCATOR_NAME, new ContainerInstantiator(), "JMDNS Discovery Locator"), null);
ctxt.registerService(ContainerTypeDescription.class, new ContainerTypeDescription(ContainerInstantiator.JMDNS_ADVERTISER_NAME, new ContainerInstantiator(), "JMDNS Discovery Advertiser"), null);
}
});
}
private final DiscoveryServiceFactory serviceFactory = new DiscoveryServiceFactory();
class DiscoveryServiceFactory implements ServiceFactory {
private volatile JMDNSDiscoveryContainer jdc;
/* (non-Javadoc)
* @see org.osgi.framework.ServiceFactory#getService(org.osgi.framework.Bundle, org.osgi.framework.ServiceRegistration)
*/
public Object getService(final Bundle bundle, final ServiceRegistration registration) {
if (jdc == null) {
try {
jdc = new JMDNSDiscoveryContainer();
jdc.connect(null, null);
} catch (final IDCreateException e) {
Trace.catching(JMDNSPlugin.PLUGIN_ID, JMDNSDebugOptions.EXCEPTIONS_CATCHING, this.getClass(), "getService(Bundle, ServiceRegistration)", e); //$NON-NLS-1$ //$NON-NLS-2$
} catch (final ContainerConnectException e) {
Trace.catching(JMDNSPlugin.PLUGIN_ID, JMDNSDebugOptions.EXCEPTIONS_CATCHING, this.getClass(), "getService(Bundle, ServiceRegistration)", e); //$NON-NLS-1$ //$NON-NLS-2$
jdc = null;
}
}
return jdc;
}
/**
* @return false if this factory has never created a service instance, true otherwise
*/
public boolean isActive() {
return jdc != null;
}
/* (non-Javadoc)
* @see org.osgi.framework.ServiceFactory#ungetService(org.osgi.framework.Bundle, org.osgi.framework.ServiceRegistration, java.lang.Object)
*/
public void ungetService(final Bundle bundle, final ServiceRegistration registration, final Object service) {
//TODO-mkuppe we later might want to dispose jmDNS when the last!!! consumer ungets the service
//Though don't forget about the (ECF) Container which might still be in use
}
}
protected Bundle getBundle() {
if (context == null) {
return null;
}
return context.getBundle();
}
/**
* This method is called when the plug-in is stopped
*/
public void stop(final BundleContext ctxt) throws Exception {
if (serviceRegistration != null && serviceFactory.isActive()) {
ServiceReference reference = serviceRegistration.getReference();
IDiscoveryLocator aLocator = (IDiscoveryLocator) ctxt.getService(reference);
serviceRegistration.unregister();
IContainer container = (IContainer) aLocator.getAdapter(IContainer.class);
container.disconnect();
container.dispose();
serviceRegistration = null;
}
if (adapterManagerTracker != null) {
adapterManagerTracker.close();
adapterManagerTracker = null;
}
if (logServiceTracker != null) {
logServiceTracker.close();
logServiceTracker = null;
logService = null;
}
this.context = ctxt;
plugin = null;
}
/**
* Returns the shared instance.
*/
public synchronized static JMDNSPlugin getDefault() {
return plugin;
}
/**
* @param string
* @param t
*/
public void logException(final String string, final Throwable t) {
getLogService();
if (logService != null) {
logService.log(LogService.LOG_ERROR, string, t);
}
}
/**
* @param string
* @param t
*/
public void logInfo(final String string, final Throwable t) {
getLogService();
if (logService != null) {
logService.log(LogService.LOG_INFO, string, t);
}
}
protected LogService getLogService() {
if (logServiceTracker == null) {
logServiceTracker = new ServiceTracker(this.context, LogService.class.getName(), null);
logServiceTracker.open();
}
logService = (LogService) logServiceTracker.getService();
if (logService == null) {
logService = new SystemLogService(PLUGIN_ID);
}
return logService;
}
/**
* @param errorString
*/
public void logError(final String errorString) {
getLogService();
if (logService != null) {
logService.log(LogService.LOG_ERROR, errorString);
}
}
}