Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/remote/nio/ControlBlock.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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0
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Initial checkin of blitz 2.0 fcs - no installer yet.
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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(); |
3dc0c5604566
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Dan Creswell <dan.creswell@gmail.com>
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44 |
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45 if (_key.isWritable()) { |
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46 synchronized(_outputBuffers) { |
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Dan Creswell <dan.creswell@gmail.com>
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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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Dan Creswell <dan.creswell@gmail.com>
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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 } |