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| Rev | Author | Line No. | Line |
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| 1539 | - | 1 | package dongfang.mkt.serial; |
| 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 | import dongfang.mkt.io.MKCommPort; |
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| 10 | |||
| 11 | /** |
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| 12 | * Thread safe! |
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| 13 | * |
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| 14 | * @author dongfang |
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| 15 | */ |
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| 16 | public class FrameQueue { |
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| 17 | private final MKInputStream input; |
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| 18 | private final MKOutputStream output; |
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| 19 | // private List responseQueue; |
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| 20 | private ResponseFrame lastResponseFrame; |
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| 21 | private boolean doQueue = true; |
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| 22 | |||
| 23 | class Receiver extends Thread { |
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| 24 | public void run() { |
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| 25 | while (doQueue) { |
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| 26 | try { |
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| 27 | ResponseFrame f = input.getNextFrame(); |
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| 28 | synchronized (FrameQueue.this.input) { |
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| 29 | lastResponseFrame = f; |
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| 30 | FrameQueue.this.input.notifyAll(); |
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| 31 | } |
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| 32 | } catch (IOException ex) { |
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| 33 | System.err.println(ex); |
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| 34 | } |
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| 35 | } |
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| 36 | System.out.println("Receiver terminated."); |
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| 37 | } |
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| 38 | } |
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| 39 | |||
| 40 | public FrameQueue(MKCommPort port) throws IOException { |
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| 41 | super(); |
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| 42 | this.input = new MKInputStream (port.getInputStream()); |
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| 43 | this.output = new MKOutputStream(port.getOutputStream()); |
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| 44 | new Receiver().start(); |
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| 45 | } |
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| 46 | |||
| 47 | public FrameQueue(InputStream in, OutputStream out) throws IOException { |
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| 48 | super(); |
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| 49 | this.input = new MKInputStream (in); |
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| 50 | this.output = new MKOutputStream(out); |
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| 51 | new Receiver().start(); |
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| 52 | } |
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| 53 | |||
| 54 | public void sendRequest(RequestFrame f) throws IOException { |
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| 55 | synchronized (this.output) { |
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| 56 | output.write(f); |
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| 57 | } |
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| 58 | } |
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| 59 | |||
| 60 | public ResponseFrame getResponseFor(RequestFrame f, int maxwait) throws IOException { |
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| 61 | ResponseFrame response; |
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| 62 | long timeout = System.currentTimeMillis() + maxwait; |
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| 63 | synchronized (input) { |
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| 64 | while ((response = responseTo(f)) == null && System.currentTimeMillis() < timeout) { |
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| 65 | try { |
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| 66 | input.wait(100); |
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| 67 | } catch (InterruptedException ex) { |
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| 68 | } |
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| 69 | } |
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| 70 | } |
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| 71 | return response; |
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| 72 | } |
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| 73 | |||
| 74 | public void kill() { |
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| 75 | doQueue = false; |
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| 76 | } |
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| 77 | |||
| 78 | private ResponseFrame responseTo(RequestFrame f) { |
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| 79 | synchronized (this.input) { |
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| 80 | if (lastResponseFrame != null && lastResponseFrame.isResponseTo(f)) { |
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| 81 | ResponseFrame result = lastResponseFrame; |
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| 82 | lastResponseFrame = null; |
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| 83 | return result; |
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| 84 | } |
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| 85 | return null; |
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| 86 | } |
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| 87 | } |
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| 88 | } |