samples/greeter/client/src/main/java/org/apache/cxf/dosgi/samples/greeter/client/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.cxf.dosgi.samples.greeter.client;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.cxf.dosgi.samples.greeter.GreeterData;
import org.apache.cxf.dosgi.samples.greeter.GreeterException;
import org.apache.cxf.dosgi.samples.greeter.GreeterService;
import org.apache.cxf.dosgi.samples.greeter.GreetingPhrase;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;

public class Activator implements BundleActivator {

    private ServiceTracker<GreeterService, GreeterService> tracker;
    private ConcurrentHashMap<GreeterService, GreeterDialog> dialogs =
                new ConcurrentHashMap<GreeterService, GreeterDialog>();

    public void start(final BundleContext bc) {
        tracker = new ServiceTracker<GreeterService, GreeterService>(bc, GreeterService.class, null) {
            @Override
            public GreeterService addingService(ServiceReference<GreeterService> reference) {
                GreeterService service = super.addingService(reference);
                dialogs.put(service, new GreeterDialog());
                useService(service);
                return service;
            }

            @Override
            public void removedService(ServiceReference<GreeterService> reference, GreeterService service) {
                super.removedService(reference, service);
                GreeterDialog dialog = dialogs.remove(service);
                dialog.dispose();
            }
        };
        tracker.open();
    }

    protected void useService(final GreeterService greeter) {
        Thread t = new Thread(new Runnable() {
            public void run() {
                greeterUI(greeter);
            }
        });
        t.start();
    }

    private void greeterUI(final GreeterService greeter) {
        while (true) {
            GreeterDialog dialog = dialogs.get(greeter);
            if (dialog == null) {
                return; // exit thread if service is removed
            }
            System.out.println("*** Opening greeter client dialog ***");
            dialog.resetSelection();
            dialog.setVisible(true); // blocks until dismissed
            Object gd = dialog.getSelection();

            if (gd instanceof String) {
                System.out.println("*** Invoking greeter ***");
                Map<GreetingPhrase, String> result = greeter.greetMe((String) gd);

                System.out.println("greetMe(\"" + gd + "\") returns:");
                for (Map.Entry<GreetingPhrase, String> greeting : result.entrySet()) {
                    System.out.println("  " + greeting.getKey().getPhrase()
                            + " " + greeting.getValue());
                }
            } else if (gd instanceof GreeterData) {
                System.out.println("*** Invoking greeter ***");
                try {
                    GreetingPhrase[] result = greeter.greetMe((GreeterData) gd);
                    System.out.println("greetMe(\"" + gd + "\") returns:");
                    for (GreetingPhrase phrase : result) {
                        System.out.println("  " + phrase.getPhrase());
                    }
                } catch (GreeterException ex) {
                    System.out.println("GreeterException: " + ex.toString());
                }
            }
        }
    }

    public void stop(BundleContext bc) throws Exception {
        tracker.close();
    }
}