1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.io.imagery;
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3 |
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4 | import org.openstreetmap.josm.Main;
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5 | import org.openstreetmap.josm.data.ProjectionBounds;
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6 | import org.openstreetmap.josm.data.coor.EastNorth;
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7 | import org.openstreetmap.josm.data.imagery.GeorefImage.State;
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8 | import org.openstreetmap.josm.data.projection.Projection;
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9 | import org.openstreetmap.josm.gui.MapView;
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10 | import org.openstreetmap.josm.gui.layer.WMSLayer;
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11 | import org.openstreetmap.josm.io.CacheFiles;
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12 |
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13 | abstract public class Grabber implements Runnable {
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14 | public final static CacheFiles cache = new CacheFiles("imagery");
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15 |
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16 | protected final MapView mv;
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17 | protected final WMSLayer layer;
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18 |
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19 | protected ProjectionBounds b;
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20 | protected Projection proj;
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21 | protected double pixelPerDegree;
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22 | protected WMSRequest request;
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23 | protected volatile boolean canceled;
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24 |
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25 | Grabber(MapView mv, WMSLayer layer, CacheFiles cache) {
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26 | this.mv = mv;
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27 | this.layer = layer;
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28 | }
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29 |
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30 | private void updateState(WMSRequest request) {
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31 | b = new ProjectionBounds(
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32 | layer.getEastNorth(request.getXIndex(), request.getYIndex()),
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33 | layer.getEastNorth(request.getXIndex() + 1, request.getYIndex() + 1));
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34 | if (b.min != null && b.max != null && WMSLayer.PROP_OVERLAP.get()) {
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35 | double eastSize = b.max.east() - b.min.east();
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36 | double northSize = b.max.north() - b.min.north();
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37 |
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38 | double eastCoef = WMSLayer.PROP_OVERLAP_EAST.get() / 100.0;
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39 | double northCoef = WMSLayer.PROP_OVERLAP_NORTH.get() / 100.0;
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40 |
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41 | this.b = new ProjectionBounds( new EastNorth(b.min.east(),
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42 | b.min.north()),
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43 | new EastNorth(b.max.east() + eastCoef * eastSize,
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44 | b.max.north() + northCoef * northSize));
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45 | }
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46 |
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47 | this.proj = Main.proj;
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48 | this.pixelPerDegree = request.getPixelPerDegree();
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49 | this.request = request;
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50 | }
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51 |
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52 | abstract void fetch(WMSRequest request) throws Exception; // the image fetch code
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53 |
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54 | int width(){
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55 | return layer.getBaseImageWidth();
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56 | }
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57 | int height(){
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58 | return layer.getBaseImageHeight();
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59 | }
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60 |
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61 | @Override
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62 | public void run() {
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63 | while (true) {
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64 | if (canceled)
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65 | return;
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66 | WMSRequest request = layer.getRequest();
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67 | if (request == null)
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68 | return;
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69 | updateState(request);
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70 | if(!loadFromCache(request)){
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71 | attempt(request);
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72 | }
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73 | if (request.getState() != null) {
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74 | layer.finishRequest(request);
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75 | mv.repaint();
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76 | }
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77 | }
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78 | }
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79 |
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80 | protected void attempt(WMSRequest request){ // try to fetch the image
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81 | int maxTries = 5; // n tries for every image
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82 | for (int i = 1; i <= maxTries; i++) {
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83 | if (canceled)
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84 | return;
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85 | try {
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86 | if (!layer.requestIsValid(request))
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87 | return;
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88 | fetch(request);
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89 | break; // break out of the retry loop
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90 | } catch (Exception e) {
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91 | try { // sleep some time and then ask the server again
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92 | Thread.sleep(random(1000, 2000));
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93 | } catch (InterruptedException e1) {}
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94 |
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95 | if(i == maxTries) {
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96 | e.printStackTrace();
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97 | request.finish(State.FAILED, null);
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98 | }
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99 | }
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100 | }
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101 | }
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102 |
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103 | public static int random(int min, int max) {
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104 | return (int)(Math.random() * ((max+1)-min) ) + min;
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105 | }
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106 |
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107 | abstract public boolean loadFromCache(WMSRequest request);
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108 |
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109 | public void cancel() {
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110 | canceled = true;
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111 | }
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112 |
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113 | }
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