platform.launcher.storageless.parent/platform.launcher.storageless/src/main/java/org/apache/clerezza/platform/launcher/ClerezzaActivator.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.clerezza.platform.launcher;

import java.net.URL;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Set;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.startlevel.StartLevel;

/**
 * OSGi Clerezza Launcher Bundle Activator.
 *
 * @author daniel
 */
public class ClerezzaActivator implements BundleActivator {

    @Override
    public void start(BundleContext context) throws Exception {
        System.out.println("starting platform launcher");
        ServiceReference startLevelRef =
                context.getServiceReference(StartLevel.class.getName());
        StartLevel startLevel = (StartLevel) context.getService(startLevelRef);
        final int currentBundleStartLevel =
                startLevel.getBundleStartLevel(context.getBundle());
        startLevel.setStartLevel(currentBundleStartLevel);
        final int originalStartLevel = startLevel.getStartLevel();
        int nextLevel = currentBundleStartLevel + 1;
        Enumeration<URL> bundleJars =
                context.getBundle().findEntries("platform-bundles", "*.jar", true);
        Set<MavenArtifactDesc> artDescs = new HashSet<MavenArtifactDesc>();

        while (bundleJars.hasMoreElements()) {
            MavenArtifactDesc artDesc =
                    MavenArtifactDesc.parseFromURL(bundleJars.nextElement());
            artDescs.add(artDesc);
        }
        ClerezzaApp.installBundles(context, artDescs, nextLevel);

        final int newStartLevel =
                originalStartLevel > nextLevel + 1 ? originalStartLevel : nextLevel + 1;
        startLevel.setStartLevel(newStartLevel);
        if (startLevel.getInitialBundleStartLevel() < nextLevel + 1) {
            startLevel.setInitialBundleStartLevel(nextLevel + 1);
        }
        System.out.println("uninstalling platform launcher");
        context.getBundle().uninstall();
    }

    @Override
    public void stop(BundleContext context) throws Exception {
    }
}