jax-rs.whiteboard/src/main/java/org/apache/aries/jax/rs/whiteboard/internal/ServicesServiceTrackerCustomizer.java

/*
 * 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.aries.jax.rs.whiteboard.internal;

import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.wiring.BundleWiring;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;

public class ServicesServiceTrackerCustomizer implements ServiceTrackerCustomizer<Object, ServiceTracker<?, ?>> {

    private final BundleContext _bundleContext;

    public ServicesServiceTrackerCustomizer(BundleContext bundleContext) {
        _bundleContext = bundleContext;
    }

    @Override
    public ServiceTracker<?, ?> addingService(ServiceReference<Object> reference) {
        String applicationSelector = reference.getProperty("jaxrs.application.select").toString();
        Bundle bundle = reference.getBundle();
        BundleWiring bundleWiring = bundle.adapt(BundleWiring.class);
        ClassLoader classLoader = bundleWiring.getClassLoader();
        Object service = _bundleContext.getService(reference);
        try {
            Filter filter = _bundleContext.createFilter(
                "(&(objectClass=" + CXFJaxRsServiceRegistrator.class.getName() +
                ")" + applicationSelector + ")");
            ServiceTracker<?, ?> serviceTracker = new ServiceTracker<>(
                    _bundleContext,
                    filter,
                    new AddonsServiceTrackerCustomizer(
                        _bundleContext, classLoader, service));
            serviceTracker.open();
            return serviceTracker;
        }
        catch (InvalidSyntaxException ise) {
            _bundleContext.ungetService(reference);
            throw new RuntimeException(ise);
        }
    }

    @Override
    public void modifiedService(ServiceReference<Object> reference, ServiceTracker<?, ?> serviceTracker) {
        removedService(reference, serviceTracker);
        addingService(reference);
    }

    @Override
    public void removedService(ServiceReference<Object> reference, ServiceTracker<?, ?> serviceTracker) {
        serviceTracker.close();
        _bundleContext.ungetService(reference);
    }

}