/*
* 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.jackrabbit.oak.osgi;
import org.apache.jackrabbit.mk.api.MicroKernel;
import org.apache.jackrabbit.oak.spi.QueryIndex;
import org.apache.jackrabbit.oak.spi.QueryIndexProvider;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* This index provider combines all indexes of all available OSGi index
* providers.
*/
public class OsgiIndexProvider implements ServiceTrackerCustomizer, QueryIndexProvider {
private BundleContext context;
private ServiceTracker tracker;
private final Map<ServiceReference, QueryIndexProvider> providers =
new HashMap<ServiceReference, QueryIndexProvider>();
public void start(BundleContext bundleContext) throws Exception {
context = bundleContext;
tracker = new ServiceTracker(
bundleContext, QueryIndexProvider.class.getName(), this);
tracker.open();
}
public void stop() throws Exception {
tracker.close();
}
@Override
public Object addingService(ServiceReference reference) {
Object service = context.getService(reference);
if (service instanceof QueryIndexProvider) {
QueryIndexProvider provider = (QueryIndexProvider) service;
providers.put(reference, provider);
return service;
} else {
context.ungetService(reference);
return null;
}
}
@Override
public void modifiedService(ServiceReference reference, Object service) {
// nothing to do
}
@Override
public void removedService(ServiceReference reference, Object service) {
providers.remove(reference);
context.ungetService(reference);
}
@Override
public List<QueryIndex> getQueryIndexes(MicroKernel mk) {
if (providers.isEmpty()) {
return Collections.emptyList();
} else if (providers.size() == 1) {
return providers.get(0).getQueryIndexes(mk);
} else {
// TODO combine indexes
return null;
}
}
}