src/net/pterodactylus/util/fcp/FcpConnectionHandler.java

   1 /*
   2  * jSite2 - FcpConnectionHandler.java -
   3  * Copyright © 2008 David Roden
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 package net.pterodactylus.util.fcp;
  21
  22 import java.io.IOException;
  23 import java.io.InputStream;
  24 import java.nio.ByteBuffer;
  25 import java.nio.charset.Charset;
  26
  27 /**
  28  * Handles an FCP connection to a node.
  29  *
  30  * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
  31  * @version $Id$
  32  */
  33 public class FcpConnectionHandler implements Runnable {
  34
  35         /** The underlying connection. */
  36         private final FcpConnection fcpConnection;
  37
  38         /** The input stream from the node. */
  39         private final InputStream remoteInputStream;
  40
  41         /** Whether to stop the connection handler. */
  42         private boolean shouldStop;
  43
  44         /** Whether the next read line feed should be ignored. */
  45         private boolean ignoreNextLinefeed;
  46
  47         /**
  48          * Creates a new connection handler that operates on the given connection
  49          * and input stream.
  50          *
  51          * @param fcpConnection
  52          *            The underlying FCP connection
  53          * @param remoteInputStream
  54          *            The input stream from the node
  55          */
  56         public FcpConnectionHandler(FcpConnection fcpConnection, InputStream remoteInputStream) {
  57                 this.fcpConnection = fcpConnection;
  58                 this.remoteInputStream = remoteInputStream;
  59         }
  60
  61         /**
  62          * {@inheritDoc}
  63          */
  64         public void run() {
  65                 FcpMessage fcpMessage = null;
  66                 while (true) {
  67                         synchronized (this) {
  68                                 if (shouldStop) {
  69                                         break;
  70                                 }
  71                         }
  72                         try {
  73                                 String line = readLine();
  74                                 System.out.println("read line: " + line);
  75                                 if (line == null) {
  76                                         break;
  77                                 }
  78                                 if (line.length() == 0) {
  79                                         continue;
  80                                 }
  81                                 line = line.trim();
  82                                 if (fcpMessage == null) {
  83                                         fcpMessage = new FcpMessage(line);
  84                                         continue;
  85                                 }
  86                                 if ("EndMessage".equals(line)) {
  87                                         fcpConnection.handleMessage(fcpMessage);
  88                                         fcpMessage = null;
  89                                 }
  90                                 int equalSign = line.indexOf('=');
  91                                 if (equalSign == -1) {
  92                                         /* something's fishy! */
  93                                         continue;
  94                                 }
  95                                 String field = line.substring(0, equalSign);
  96                                 String value = line.substring(equalSign + 1);
  97                                 assert fcpMessage != null : "fcp message is null";
  98                                 fcpMessage.setField(field, value);
  99                         } catch (IOException e) {
 100                                 break;
 101                         }
 102                 }
 103         }
 104
 105         /**
 106          * Stops the connection handler.
 107          */
 108         public void stop() {
 109                 synchronized (this) {
 110                         shouldStop = true;
 111                 }
 112         }
 113
 114         //
 115         // PRIVATE METHODS
 116         //
 117
 118         /**
 119          * Reads bytes from {@link #remoteInputStream} until ‘\r’ or ‘\n’ are
 120          * encountered and decodes the read bytes using UTF-8.
 121          *
 122          * @return The decoded line
 123          * @throws IOException
 124          *             if an I/O error occurs
 125          */
 126         private String readLine() throws IOException {
 127                 byte[] readBytes = new byte[512];
 128                 int readIndex = 0;
 129                 while (true) {
 130                         int nextByte = remoteInputStream.read();
 131                         if (nextByte == -1) {
 132                                 if (readIndex == 0) {
 133                                         return null;
 134                                 }
 135                                 break;
 136                         }
 137                         if (nextByte == 10) {
 138                                 if (!ignoreNextLinefeed) {
 139                                         break;
 140                                 }
 141                         }
 142                         ignoreNextLinefeed = false;
 143                         if (nextByte == 13) {
 144                                 ignoreNextLinefeed = true;
 145                                 break;
 146                         }
 147                         if (readIndex == readBytes.length) {
 148                                 /* recopy & enlarge array */
 149                                 byte[] newReadBytes = new byte[readBytes.length * 2];
 150                                 System.arraycopy(readBytes, 0, newReadBytes, 0, readBytes.length);
 151                                 readBytes = newReadBytes;
 152                         }
 153                         readBytes[readIndex++] = (byte) nextByte;
 154                 }
 155                 ByteBuffer byteBuffer = ByteBuffer.wrap(readBytes, 0, readIndex);
 156                 return Charset.forName("UTF-8").decode(byteBuffer).toString();
 157         }
 158
 159 }