Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/remote/nio/ControlBlock.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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1 package org.dancres.blitz.remote.nio;
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2
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3 import java.nio.channels.SelectionKey;
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4 import java.nio.channels.SocketChannel;
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5 import java.nio.ByteBuffer;
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6 import java.io.IOException;
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7 import java.util.ArrayList;
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8
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9 /**
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10 * Responsible for processing selector messages associated with a particular
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11 * endpoint (socket) as defined by a SelectionKey. Uses a dispatcher to
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12 * actually process the data received (it may also invoke methods etc) and to
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13 * generate responses to be transmitted back through the endpoint.
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14 */
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15 public class ControlBlock {
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16 private SelectionKey _key;
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17 private ArrayList _outputBuffers = new ArrayList();
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18 private Dispatcher _dispatcher;
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19
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20 ControlBlock(SelectionKey aKey, Dispatcher aDispatcher) {
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21 _key = aKey;
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22 _dispatcher = aDispatcher;
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23 }
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24
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25 /**
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26 * Processes the SelectionKey's events according to internal state machine
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27 * and dispatches work to threads accordingly
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28 */
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29 public void process() throws IOException {
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30 /*
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31 Determine what flags are tripped
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32
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33 If write flag is set invoke a write using current list of
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34 buffers. Scan buffers for now done and remove them from the
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35 list. If there are no buffers, turn of the write interest flag
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36 in selector
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37
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38 If read flag is set grab bytes and parse with state machine
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39 which will then figure out whether we are ready to process
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40 a request and dispatch it to the pool with a reference to us
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41 so's we can post the response.
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42 */
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43 SocketChannel myChannel = (SocketChannel) _key.channel();
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44
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45 if (_key.isWritable()) {
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46 synchronized(_outputBuffers) {
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47
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48 while (_outputBuffers.size() > 0) {
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49 ByteBuffer myBuffer = (ByteBuffer) _outputBuffers.get(0);
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50
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51 myChannel.write(myBuffer);
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52
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53 if (myBuffer.hasRemaining()) {
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54 break;
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55 } else
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56 _outputBuffers.remove(0);
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57 }
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58
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59 if (_outputBuffers.size() == 0) {
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60 _key.interestOps(_key.interestOps() ^ SelectionKey.OP_WRITE);
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61 }
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62 }
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63 }
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64
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65 if (_key.isReadable()) {
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66 _dispatcher.process(this);
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67 }
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68 }
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69
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70 public SocketChannel getChannel() {
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71 return (SocketChannel) _key.channel();
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72 }
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73
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74 public void send(ByteBuffer[] aBuffers) {
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75 /*
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76 Lock current list of buffers add this one to the list
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77
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78 If this is the first new set of buffers we need to set
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79 write interest on our selection key and then do
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80 _key.selector().wakeup() so we get events
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81 */
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82 boolean enableWrites;
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83
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84 synchronized(_outputBuffers) {
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85 enableWrites = (_outputBuffers.size() == 0);
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86
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87 for (int i = 0; i < aBuffers.length; i++) {
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88 _outputBuffers.add(aBuffers[i]);
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89 }
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90 }
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91
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92 if (enableWrites) {
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93 if (_key.isValid()) {
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94 _key.interestOps(_key.interestOps() | SelectionKey.OP_WRITE);
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95 _key.selector().wakeup();
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96 }
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97 }
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98 }
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99 }