1 /*

     2  * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  *

     8  *   - Redistributions of source code must retain the above copyright

     9  *     notice, this list of conditions and the following disclaimer.

    10  *

    11  *   - Redistributions in binary form must reproduce the above copyright

    12  *     notice, this list of conditions and the following disclaimer in the

    13  *     documentation and/or other materials provided with the distribution.

    14  *

    15  *   - Neither the name of Oracle nor the names of its

    16  *     contributors may be used to endorse or promote products derived

    17  *     from this software without specific prior written permission.

    18  *

    19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

    20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

    21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

    23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

    27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

    28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

    29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    30  */

    31 

    32 /*

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

    34  * or technique and has been deliberately simplified. Additional steps

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

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

    37  * this sample code.

    38  */

    39 

    40 

    41 import java.io.*;

    42 import java.net.*;

    43 import java.lang.Byte;

    44 

    45 /**

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

    47  */

    48 

    49 public class SimpleServer

    50 {

    51   private final static int BYTESPEROP= PollingServer.BYTESPEROP;

    52   private final static int PORTNUM   = PollingServer.PORTNUM;

    53   private final static int MAXCONN   = PollingServer.MAXCONN;

    54 

    55   /*

    56    * This synchronization object protects access to certain

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

    58    */

    59   private final static Object eventSync = new Object();

    60 

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

    62   private static int bytesRead;

    63   private static int bytesToRead;

    64 

    65   public SimpleServer() {

    66     Socket[] sockArr = new Socket[MAXCONN];

    67     long timestart, timestop;

    68     int bytes;

    69     int totalConn=0;

    70 

    71 

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

    73     try {

    74 

    75       ServerSocket skMain = new ServerSocket (PORTNUM);

    76 

    77       bytesRead = 0;

    78       Socket ctrlSock = skMain.accept();

    79 

    80       BufferedReader ctrlReader =

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

    82       String ctrlString = ctrlReader.readLine();

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

    84       ctrlString = ctrlReader.readLine();

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

    86 

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

    88                          totalConn + " client connections");

    89 

    90       timestart = System.currentTimeMillis();

    91 

    92       /*

    93        * Take connections, spawn off connection handling threads

    94        */

    95       ConnHandler[] connHA = new ConnHandler[MAXCONN];

    96       int conn = 0;

    97       while ( conn < totalConn ) {

    98           Socket sock = skMain.accept();

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

   100           connHA[conn].start();

   101           conn++;

   102       }

   103 

   104       while ( bytesRead < bytesToRead ) {

   105           java.lang.Thread.sleep(500);

   106       }

   107       timestop = System.currentTimeMillis();

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

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

   110       // Tell the client it can now go away

   111       byte[] buff = new byte[BYTESPEROP];

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

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

   114   }

   115 

   116   /*

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

   118    */

   119   public static void main (String args[])

   120   {

   121     SimpleServer server = new SimpleServer();

   122   }

   123 

   124   /*

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

   126    */

   127   class ConnHandler extends Thread {

   128     private InputStream instr;

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

   130 

   131     public void run() {

   132       try {

   133         int bytes;

   134         byte[] buff = new byte[BYTESPEROP];

   135 

   136         while ( bytesRead < bytesToRead ) {

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

   138           if (bytes > 0 ) {

   139             synchronized(eventSync) {

   140               bytesRead += bytes;

   141             }

   142             /*

   143              * Any real server would do some synchronized and some

   144              * unsynchronized work on behalf of the client, and

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

   146              * gross oversimplification.

   147              */

   148           }

   149           else {

   150             if (bytesRead < bytesToRead)

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

   152           }

   153         }

   154       }

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

   156     }

   157   }

   158 }