httpserverfactory.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.Enumeration;
import java.util.Hashtable;

import org.knopflerfish.service.log.LogRef;
import org.osgi.framework.BundleContext;
import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.cm.ManagedServiceFactory;

public class HttpServerFactory implements ManagedServiceFactory {

    final static String DEFAULT_PID = Activator.FACTORY_PID + ".default";

    // private fields

    private final BundleContext bc;

    private final LogRef log;

    private final Dictionary servers = new Hashtable();

    // constructors

    HttpServerFactory(final BundleContext bc, final LogRef log) {

        this.bc = bc;
        this.log = log;
    }

    // public methods

    public void destroy() {

        Enumeration e = servers.keys();
        while (e.hasMoreElements())
            deleted((String) e.nextElement());
    }

    // implements ManagedServiceFactory

    Object updateLock = new Object();

    public void updated(String pid, Dictionary configuration)
            throws ConfigurationException {

        synchronized (updateLock) {
            if (log.doDebug()) {
                log.debug("Updated pid=" + pid);
            }

            if (DEFAULT_PID.equals(pid) && servers.size() > 0) {
                if (log.doDebug()) {
                    log.debug("Skip default since we already have something");
                }
                return;
            }

            // As soon as we get a "non-default"-config, delete default
            if (!DEFAULT_PID.equals(pid) && (null != servers.get(DEFAULT_PID))) {
                if (log.doDebug()) {
                    log
                            .debug("Overriding default instance with new pid "
                                    + pid);
                }
                deleted(DEFAULT_PID);
            }

            HttpServer httpServer = (HttpServer) servers.get(pid);
            if (httpServer == null) {
                if (log.doDebug()) {
                    log.debug("create pid=" + pid);
                }
                httpServer = new HttpServer(bc, new HttpConfig(configuration),
                        log);
                servers.put(pid, httpServer);

                // registration is moved to HttpServer.update()
            } else {
                httpServer.getHttpConfig().updated(configuration);
            }

            // this will setup and possibly register the actual service
            httpServer.updated();
        }
    }

    public void deleted(String pid) {

        HttpServer httpServer = (HttpServer) servers.remove(pid);
        if (httpServer != null) {
            if (log.doDebug()) {
                log.debug("delete pid=" + pid);
            }
            httpServer.destroy();
        }
    }

    public String getName() {
        return "Knopflerfish HTTP Service"; // NYI
    }

} // HttpServerFactory