examples/karaf-config-example/karaf-config-example-managed-factory/src/main/java/org/apache/karaf/example/config/managedfactory/Activator.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.karaf.example.config.managedfactory;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.cm.ManagedServiceFactory;

import java.util.Dictionary;
import java.util.Enumeration;
import java.util.Hashtable;

public class Activator implements BundleActivator {

    private ServiceRegistration<ManagedServiceFactory> registration;

    @Override
    public void start(BundleContext bundleContext) {
        ManagedServiceFactory factory = new ManagedServiceFactory() {
            @Override
            public String getName() {
                return "Example Managed Factory";
            }

            @Override
            public void updated(String pid, Dictionary<String, ?> properties) throws ConfigurationException {
                System.out.println("New configuration with pid " + pid);
                Enumeration<String> keys = properties.keys();
                while (keys.hasMoreElements()) {
                    String key = keys.nextElement();
                    System.out.println(key + " = " + properties.get(key));
                }
            }

            @Override
            public void deleted(String pid) {
                System.out.println("Delete configuration with pid " + pid);
            }
        };
        Hashtable<String, String> serviceProperties = new Hashtable<>();
        serviceProperties.put(Constants.SERVICE_PID, "org.apache.karaf.example.config");
        registration = bundleContext.registerService(ManagedServiceFactory.class, factory, serviceProperties);
    }

    @Override
    public void stop(BundleContext bundleContext) {
        if (registration != null) {
            registration.unregister();
        }
    }

}