Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/remote/nio/DispatcherImpl.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.remote.nio; |
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2 |
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3 import org.dancres.blitz.SpaceImpl; |
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4 |
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5 import java.nio.ByteBuffer; |
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6 import java.nio.channels.SocketChannel; |
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7 import java.io.IOException; |
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8 |
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9 /** |
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10 */ |
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11 public class DispatcherImpl implements Dispatcher { |
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12 private static final int GET_HEADER = 1; |
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13 private static final int GET_BODY = 2; |
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14 |
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15 private int _state = GET_HEADER; |
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16 |
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17 private int _msgSize; |
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18 private int _reqId; |
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19 private SpaceImpl _space; |
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20 |
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21 /* |
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22 Ultimately we should maintain a pool of buffers and request one which |
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23 is big enough for our message body. Once we've processed, we should |
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24 then return the buffer to the pool. |
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25 */ |
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26 private ByteBuffer _headerBuffer = ByteBuffer.allocate(8); |
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27 private ByteBuffer _bodyBuffer; |
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28 |
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29 DispatcherImpl(SpaceImpl aSpace) { |
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30 _space = aSpace; |
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31 } |
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32 |
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33 public void process(ControlBlock aBlock) throws IOException { |
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34 SocketChannel myChannel = aBlock.getChannel(); |
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35 |
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36 if (_state == GET_HEADER) { |
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37 if (myChannel.read(_headerBuffer) == -1) |
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38 throw new IOException("Socket closed"); |
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39 |
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40 if (! _headerBuffer.hasRemaining()) { |
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41 _state = GET_BODY; |
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42 |
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43 _headerBuffer.flip(); |
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44 _reqId = _headerBuffer.getInt(); |
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Dan Creswell <dan.creswell@gmail.com>
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45 _msgSize = _headerBuffer.getInt(); |
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46 |
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47 _bodyBuffer = ByteBuffer.allocate(_msgSize); |
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48 |
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49 _headerBuffer.clear(); |
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50 } |
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51 } |
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52 |
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53 if (_state == GET_BODY) { |
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54 if (myChannel.read(_bodyBuffer) == -1) |
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55 throw new IOException("Socket closed"); |
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56 |
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57 if (! _bodyBuffer.hasRemaining()) { |
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58 // Read the message, process it |
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59 |
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60 _bodyBuffer.flip(); |
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61 |
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62 try { |
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63 Pool.execute(new MessageDecoder(_reqId, _space, aBlock, |
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64 _bodyBuffer.array())); |
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65 } catch (InterruptedException anIE) { |
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66 System.err.println("Interrupted during message dispatch"); |
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67 anIE.printStackTrace(System.err); |
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68 } |
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69 |
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70 // Ready for next message |
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71 _state = GET_HEADER; |
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72 |
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73 // _bodyBuffer.clear(); |
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74 } |
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75 } |
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76 } |
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77 |
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78 } |