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1563 | - | 1 | package dongfang.mkt.comm; |
2 | |||
3 | import java.io.IOException; |
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4 | import java.io.InputStream; |
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5 | import java.io.OutputStream; |
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6 | |||
7 | import dongfang.mkt.frames.RequestFrame; |
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8 | import dongfang.mkt.frames.ResponseFrame; |
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9 | |||
10 | /** |
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11 | * Thread safe! |
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12 | * |
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13 | * @author dongfang |
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14 | */ |
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15 | public class FrameQueue { |
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16 | private final MKInputStream input; |
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17 | private final MKOutputStream output; |
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18 | // private List responseQueue; |
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19 | private ResponseFrame lastResponseFrame; |
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20 | private boolean doQueue = true; |
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21 | |||
22 | class Receiver extends Thread { |
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23 | public void run() { |
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24 | while (doQueue) { |
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25 | try { |
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26 | ResponseFrame f = input.getNextFrame(); |
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27 | synchronized (FrameQueue.this.input) { |
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28 | lastResponseFrame = f; |
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29 | FrameQueue.this.input.notifyAll(); |
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30 | } |
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31 | } catch (IOException ex) { |
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32 | System.err.println(ex); |
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33 | } |
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34 | } |
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35 | System.out.println("Receiver terminated."); |
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36 | } |
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37 | } |
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38 | |||
39 | public FrameQueue(MKConnection port) throws IOException { |
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40 | super(); |
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41 | this.input = new MKInputStream (port.getInputStream()); |
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42 | this.output = new MKOutputStream(port.getOutputStream()); |
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43 | new Receiver().start(); |
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44 | } |
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45 | |||
46 | public FrameQueue(InputStream in, OutputStream out) throws IOException { |
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47 | super(); |
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48 | this.input = new MKInputStream (in); |
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49 | this.output = new MKOutputStream(out); |
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50 | new Receiver().start(); |
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51 | } |
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52 | |||
53 | public void sendRequest(RequestFrame f) throws IOException { |
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54 | synchronized (this.output) { |
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55 | output.write(f); |
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56 | } |
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57 | } |
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58 | |||
59 | public ResponseFrame getResponseFor(RequestFrame f, int maxwait) throws IOException { |
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60 | ResponseFrame response; |
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61 | long timeout = System.currentTimeMillis() + maxwait; |
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62 | synchronized (input) { |
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63 | while ((response = responseTo(f)) == null && System.currentTimeMillis() < timeout) { |
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64 | try { |
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65 | input.wait(100); |
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66 | } catch (InterruptedException ex) { |
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67 | } |
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68 | } |
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69 | } |
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70 | return response; |
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71 | } |
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72 | |||
73 | public void kill() { |
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74 | doQueue = false; |
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75 | } |
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76 | |||
77 | private ResponseFrame responseTo(RequestFrame f) { |
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78 | synchronized (this.input) { |
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79 | if (lastResponseFrame != null && lastResponseFrame.isResponseTo(f)) { |
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80 | ResponseFrame result = lastResponseFrame; |
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81 | lastResponseFrame = null; |
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82 | return result; |
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83 | } |
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84 | return null; |
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85 | } |
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86 | } |
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87 | } |