/*
 * 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 java.util.Enumeration;

import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceRegistration;

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


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