activator.java

OSGI这是一个中间件,与UPNP齐名,是用于移植到嵌入式平台之上

/*
 * Copyright (c) 2003, KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.http;

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

import org.knopflerfish.service.log.LogRef;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.cm.Configuration;
import org.osgi.service.cm.ConfigurationAdmin;
import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.cm.ManagedServiceFactory;

public class Activator implements BundleActivator {

    // public constants

    public static final String FACTORY_PID = "org.knopflerfish.bundle.http.factory.HttpServer";

    // public fields

    public static BundleContext bc = null;

    // private fields

    private LogRef log = null;

    private HttpServerFactory serverFactory = null;

    private ServiceRegistration configReg = null;

    // implements BundleActivator

    public void start(BundleContext bc) {

        Activator.bc = bc;

        log = new LogRef(bc, true);

        serverFactory = new HttpServerFactory(bc, log);

        Dictionary parameters = new Hashtable();
        parameters.put("service.pid", FACTORY_PID);
        configReg = bc.registerService(ManagedServiceFactory.class.getName(),
                serverFactory, parameters);

        ServiceReference adminRef = null;
        try {
            ConfigurationAdmin admin = null;
            Configuration[] configs = null;
            try {
                adminRef = bc.getServiceReference(ConfigurationAdmin.class
                        .getName());

                // Potential start order problem!
                if (adminRef != null) {
                    admin = (ConfigurationAdmin) bc.getService(adminRef);
                    String filter = "(&(service.factoryPid=" + FACTORY_PID
                            + ")" + "(|(service.bundleLocation="
                            + bc.getBundle().getLocation() + ")"
                            + "(service.bundleLocation=NULL)"
                            + "(!(service.bundleLocation=*))))";
                    configs = admin.listConfigurations(filter);
                }
            } catch (Exception e) {
                if (log.doDebug())
                    log.debug("Exception when trying to get CM", e);
            }
            if (admin == null) {
                if (log.doInfo())
                    log.info("No CM present, using default configuration");
                serverFactory.updated(HttpServerFactory.DEFAULT_PID, HttpConfig
                        .getDefaultConfig());
            } else {
                if (configs == null || configs.length == 0) {
                    if (log.doInfo())
                        log
                                .info("No configuration present, creating default configuration");

                    serverFactory.updated(HttpServerFactory.DEFAULT_PID,
                            HttpConfig.getDefaultConfig());
                }
            }
        } catch (ConfigurationException ce) {
            if (log.doError())
                log.error("Configuration error", ce);
        } finally {
            if (adminRef != null)
                bc.ungetService(adminRef);
        }
    }

    public void stop(BundleContext bc) {

        bc = null;

        configReg.unregister();
        configReg = null;

        serverFactory.destroy();
        serverFactory = null;

        log.close();
        log = null;
    }

} // Activator