/*
    * $HeadURL: https://svn.apache.org/repos/asf/httpcomponents/oac.hc3x/trunk/src/test/org/apache/commons/httpclient/server/SimpleHttpServer.java $
    * $Revision$
    * $Date$
    *
    * ====================================================================
    *
    *  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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.commons.httpclient.server;
  
  import java.io.IOException;
  import java.net.InetAddress;
  import java.net.ServerSocket;
  import java.net.Socket;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  /***
   * A simple, but extensible HTTP server, mostly for testing purposes.
   * 
   * @author Christian Kohlschuetter
   * @author Oleg Kalnichevski
   */
  public class SimpleHttpServer implements Runnable {
      private static final Log LOG = LogFactory.getLog(SimpleHttpServer.class);
      
      private String testname = "Simple test";
      private long count = 0;
      private ServerSocket listener = null;
      private Thread t;
      private ThreadGroup tg;
      private boolean stopped = false;
  
      private SimpleConnSet connections = new SimpleConnSet();
  
      private HttpRequestHandler requestHandler = null;
  
      /***
       * Creates a new HTTP server instance, using an arbitrary free TCP port
       * 
       * @throws IOException  if anything goes wrong during initialization
       */
      public SimpleHttpServer() throws IOException {
          this(null, 0);
      }
  
      /***
       * Creates a new HTTP server instance, using the specified socket
       * factory and the TCP port
       * 
       * @param   port    Desired TCP port
       * @throws IOException  if anything goes wrong during initialization
       */
      public SimpleHttpServer(SimpleSocketFactory socketfactory, int port) 
          throws IOException {
          if (socketfactory == null) {
          	socketfactory = new SimplePlainSocketFactory();
          }
          listener = socketfactory.createServerSocket(port);
          if(LOG.isDebugEnabled()) {
              LOG.debug("Starting test HTTP server on port " + getLocalPort());
          }
          tg = new ThreadGroup("SimpleHttpServer thread group");
          t = new Thread(tg, this, "SimpleHttpServer listener");
          t.setDaemon(true);
          t.start();
      }
  
      /***
       * Creates a new HTTP server instance, using the specified TCP port
       * 
       * @param   port    Desired TCP port
       * @throws IOException  if anything goes wrong during initialization
       */
      public SimpleHttpServer(int port) throws IOException {
          this(null, port);
     }
 
     public String getTestname() {
         return this.testname;
     }
 
     public void setTestname(final String testname) {
         this.testname = testname;
     }
     
     /***
      * Returns the TCP port that this HTTP server instance is bound to.
      *
      * @return  TCP port, or -1 if not running
      */
     public int getLocalPort() {
         return listener.getLocalPort();
     }
     
     /***
      * Returns the IP address that this HTTP server instance is bound to.
      * @return String representation of the IP address or <code>null</code> if not running
      */
     public String getLocalAddress() {
         InetAddress address = listener.getInetAddress();
         // Ugly work-around for older JDKs
         byte[] octets = address.getAddress();
         if ((octets[0] == 0) 
          && (octets[1] == 0) 
          && (octets[2] == 0) 
          && (octets[3] == 0)) {
             return "localhost"; 
         } else {
             return address.getHostAddress();
         }
     }
 
     /***
      * Checks if this HTTP server instance is running.
      * 
      * @return  true/false
      */
     public boolean isRunning() {
         if(t == null) {
             return false;
         }
         return t.isAlive();
     }
 
     /***
      * Stops this HTTP server instance.
      */
     public synchronized void destroy() {
         if (stopped) {
             return;
         }
 
         this.stopped = true;
         if(LOG.isDebugEnabled()) {
             LOG.debug("Stopping test HTTP server on port " + getLocalPort());
         }
         tg.interrupt();
         
         if (listener != null) {
             try {
                 listener.close();
             } catch(IOException e) {
                 
             }
         }
         this.connections.shutdown();
     }
 
     /***
      * Returns the currently used HttpRequestHandler by this SimpleHttpServer
      * 
      * @return The used HttpRequestHandler, or null.
      */
     public HttpRequestHandler getRequestHandler() {
         return requestHandler;
     }
 
     /***
      * Sets the HttpRequestHandler to be used for this SimpleHttpServer.
      * 
      * @param rh    Request handler to be used, or null to disable.
      */
     public void setRequestHandler(HttpRequestHandler rh) {
         this.requestHandler = rh;
     }
 
     public void setHttpService(HttpService service) {
         setRequestHandler(new HttpServiceHandler(service));
     }
 
     public void run() {
         try {
             while (!this.stopped && !Thread.interrupted()) {
                 Socket socket = listener.accept();
                 try {
                     if (this.requestHandler == null) {
                         socket.close();
                         break;
                     }
                     SimpleHttpServerConnection conn = new SimpleHttpServerConnection(socket); 
                     this.connections.addConnection(conn);
 
                     Thread t = new SimpleConnectionThread(
                             tg,
                             this.testname + " thread " + this.count,
                             conn, 
                             this.connections,
                             this.requestHandler);
                     t.setDaemon(true);
                     t.start();
                 } catch (IOException e) {
                     LOG.error("I/O error: " + e.getMessage());
                 }
                 this.count++;
                 Thread.sleep(100);
             }
         } catch (InterruptedException accept) {
         } catch (IOException e) {
             if (!stopped) {
                 LOG.error("I/O error: " + e.getMessage());
             }
         } finally {
             destroy();
         }
     }
 }