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This bundle is the core implementation of the Karaf features support.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.karaf.features.internal.service;
import java.util.Dictionary;
import java.util.Hashtable;
import org.apache.karaf.features.EventConstants;
import org.apache.karaf.features.FeatureEvent;
import org.apache.karaf.features.FeaturesListener;
import org.apache.karaf.features.RepositoryEvent;
import org.osgi.framework.BundleContext;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventAdmin;
import org.osgi.util.tracker.ServiceTracker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A listener to publish events to EventAdmin
*/
public class EventAdminListener implements FeaturesListener {
private static final Logger LOGGER = LoggerFactory.getLogger(EventAdminListener.class);
private final ServiceTracker tracker;
public EventAdminListener(BundleContext context) {
tracker = new ServiceTracker<>(context, EventAdmin.class.getName(), null);
tracker.open();
}
public void featureEvent(FeatureEvent event) {
try {
EventAdmin eventAdmin = tracker.getService();
if (eventAdmin == null) {
return;
}
Dictionary props = new Hashtable<>();
props.put(EventConstants.TYPE, event.getType());
props.put(EventConstants.EVENT, event);
props.put(EventConstants.TIMESTAMP, System.currentTimeMillis());
props.put(EventConstants.FEATURE_NAME, event.getFeature().getName());
props.put(EventConstants.FEATURE_VERSION, event.getFeature().getVersion());
String topic;
switch (event.getType()) {
case FeatureInstalled:
topic = EventConstants.TOPIC_FEATURES_INSTALLED;
break;
case FeatureUninstalled:
topic = EventConstants.TOPIC_FEATURES_UNINSTALLED;
break;
default:
throw new IllegalStateException("Unknown features event type: " + event.getType());
}
eventAdmin.postEvent(new Event(topic, props));
} catch (IllegalStateException e) {
LOGGER.warn("Unable to post event to EventAdmin", e);
}
}
public void repositoryEvent(RepositoryEvent event) {
try {
EventAdmin eventAdmin = tracker.getService();
if (eventAdmin == null) {
return;
}
Dictionary props = new Hashtable<>();
props.put(EventConstants.TYPE, event.getType());
props.put(EventConstants.EVENT, event);
props.put(EventConstants.TIMESTAMP, System.currentTimeMillis());
props.put(EventConstants.REPOSITORY_URI, event.getRepository().getURI().toString());
String topic;
switch (event.getType()) {
case RepositoryAdded:
topic = EventConstants.TOPIC_REPOSITORY_ADDED;
break;
case RepositoryRemoved:
topic = EventConstants.TOPIC_REPOSITORY_REMOVED;
break;
default:
throw new IllegalStateException("Unknown repository event type: " + event.getType());
}
eventAdmin.postEvent(new Event(topic, props));
} catch (IllegalStateException e) {
LOGGER.warn("Unable to post event to EventAdmin", e);
}
}
}