Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/remote/nio/Rxer.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 com.go.trove.util.IntHashMap;
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4
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5 import java.io.InputStream;
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6 import java.io.DataInputStream;
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7 import java.util.Collection;
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8 import java.util.Iterator;
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9 import java.rmi.RemoteException;
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10 import java.lang.ref.WeakReference;
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11
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12 /**
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13 * Txer's twin - waits for a response id and a payload which is then passed
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14 * to the ResultProcessor registered against the id. Obviously the
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15 * ResultProcessor should be registered against the id prior to transmission
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16 * to avoid race conditions.
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17 *
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18 * @todo That means if there's an exception during transmission, the
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19 * ResultProcessor should be removed (might be a good plan to do this all with
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20 * weak references automatically).
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21 */
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22 public class Rxer extends Thread {
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23 private DataInputStream _socketRx;
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24 private final IntHashMap _listeners = new IntHashMap();
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25 private WeakReference _listener;
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26
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27 Rxer(InputStream anInput, TransportListener aListener) {
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28 _socketRx = new DataInputStream(anInput);
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29 _listener = new WeakReference(aListener);
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30 setDaemon(true);
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31 start();
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32 }
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33
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34 void waitFor(int anId, ResultProcessor aProcessor) {
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35 synchronized(_listeners) {
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36 _listeners.put(anId, aProcessor);
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37 }
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38 }
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39
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40 void cancel(int anId) {
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41 synchronized(_listeners) {
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42 _listeners.remove(anId);
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43 }
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44 }
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45
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46 public void run() {
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47 while (true) {
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48 try {
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49 int myReqId = _socketRx.readInt();
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50
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51 // System.err.println("Receiving: " + myReqId);
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52
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53 int myResponseSize = _socketRx.readInt();
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54
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55 byte[] myBuffer = new byte[myResponseSize];
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56
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57 _socketRx.readFully(myBuffer);
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58
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59 ResultProcessor myProcessor;
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60
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61 synchronized(_listeners) {
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62 myProcessor = (ResultProcessor) _listeners.remove(myReqId);
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63 }
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64
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65 if (myProcessor != null)
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66 myProcessor.deliver(myBuffer);
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67
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68 } catch (Exception anE) {
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69 // System.err.println("Error receiving response");
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70 // anE.printStackTrace(System.err);
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71
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72 // Tell all listeners to abort
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73 Collection myListeners;
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74
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75 synchronized(_listeners) {
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76 myListeners = _listeners.values();
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77 }
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78
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79 Iterator myRecipients = myListeners.iterator();
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80
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81 while (myRecipients.hasNext()) {
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82 ResultProcessor myProcessor =
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83 (ResultProcessor) myRecipients.next();
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84
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85 myProcessor.deliver(new RemoteException("Connection problem", anE));
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86 }
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87
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88 pingListener();
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89
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90 return;
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91 }
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92 }
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93 }
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94
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95 private void pingListener() {
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96 TransportListener myListener = (TransportListener) _listener.get();
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97
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98 if (myListener != null)
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99 myListener.dead();
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100 }
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101 }