/*

 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. 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 Oracle 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.

 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

import java.io.*;

import java.net.*;

import java.lang.Byte;

/**

 * Simple Java "server" using a single thread to handle each connection.

 */

public class SimpleServer

{

  private final static int BYTESPEROP= PollingServer.BYTESPEROP;

  private final static int PORTNUM   = PollingServer.PORTNUM;

  private final static int MAXCONN   = PollingServer.MAXCONN;

  /*

   * This synchronization object protects access to certain

   * data (bytesRead,eventsToProcess) by concurrent Consumer threads.

   */

  private final static Object eventSync = new Object();

  private static InputStream[] instr = new InputStream[MAXCONN];

  private static int bytesRead;

  private static int bytesToRead;

  public SimpleServer() {

    Socket[] sockArr = new Socket[MAXCONN];

    long timestart, timestop;

    int bytes;

    int totalConn=0;

    System.out.println ("Serv: Initializing port " + PORTNUM);

    try {

      ServerSocket skMain = new ServerSocket (PORTNUM);

      bytesRead = 0;

      Socket ctrlSock = skMain.accept();

      BufferedReader ctrlReader =

        new BufferedReader(new InputStreamReader(ctrlSock.getInputStream()));

      String ctrlString = ctrlReader.readLine();

      bytesToRead = Integer.valueOf(ctrlString).intValue();

      ctrlString = ctrlReader.readLine();

      totalConn = Integer.valueOf(ctrlString).intValue();

      System.out.println("Receiving " + bytesToRead + " bytes from " +

                         totalConn + " client connections");

      timestart = System.currentTimeMillis();

      /*

       * Take connections, spawn off connection handling threads

       */

      ConnHandler[] connHA = new ConnHandler[MAXCONN];

      int conn = 0;

      while ( conn < totalConn ) {

          Socket sock = skMain.accept();

          connHA[conn] = new ConnHandler(sock.getInputStream());

          connHA[conn].start();

          conn++;

      }

      while ( bytesRead < bytesToRead ) {

          java.lang.Thread.sleep(500);

      }

      timestop = System.currentTimeMillis();

      System.out.println("Time for all reads (" + totalConn +

                         " sockets) : " + (timestop-timestart));

      // Tell the client it can now go away

      byte[] buff = new byte[BYTESPEROP];

      ctrlSock.getOutputStream().write(buff,0,BYTESPEROP);

    } catch (Exception exc) { exc.printStackTrace(); }

  }

  /*

   * main ... just create invoke the SimpleServer constructor.

   */

  public static void main (String args[])

  {

    SimpleServer server = new SimpleServer();

  }

  /*

   * Connection Handler inner class...one of these per client connection.

   */

  class ConnHandler extends Thread {

    private InputStream instr;

    public ConnHandler(InputStream inputStr) { instr = inputStr; }

    public void run() {

      try {

        int bytes;

        byte[] buff = new byte[BYTESPEROP];

        while ( bytesRead < bytesToRead ) {

          bytes = instr.read (buff, 0, BYTESPEROP);

          if (bytes > 0 ) {

            synchronized(eventSync) {

              bytesRead += bytes;

            }

            /*

             * Any real server would do some synchronized and some

             * unsynchronized work on behalf of the client, and

             * most likely send some data back...but this is a

             * gross oversimplification.

             */

          }

          else {

            if (bytesRead < bytesToRead)

              System.out.println("instr.read returned : " + bytes);

          }

        }

      }

      catch (Exception e) {e.printStackTrace();}

    }

  }

}