Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/remote/nio/DispatcherImpl.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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 }