[31] | 1 | package vnsim.vehicular.routePlan.cityRouting; |
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| 2 | |
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| 3 | import java.io.BufferedReader; |
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| 4 | import java.io.BufferedWriter; |
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| 5 | import java.io.File; |
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| 6 | import java.io.FileReader; |
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| 7 | import java.io.FileWriter; |
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| 8 | import java.io.IOException; |
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| 9 | import java.util.ArrayList; |
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| 10 | import java.util.StringTokenizer; |
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| 11 | |
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| 12 | import vnsim.map.object.Globals; |
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| 13 | |
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| 14 | public class Server { |
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| 15 | // server is processing data x time faster |
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| 16 | public static final int kTimeCompression = 5; |
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| 17 | // threshold |
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| 18 | private static final double kCongestionThresh = 5.0; |
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| 19 | // congestion for every cross roads |
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| 20 | private ArrayList<CrossRoadCongestion> crCongestion; |
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| 21 | // list of segments with their actual congestion; |
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| 22 | private ArrayList<RoadSegmentCongestion> updatedCongestion; |
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| 23 | // true if lastWeek was generated or loaded |
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| 24 | private boolean isLastWeekSet; |
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| 25 | |
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| 26 | public Server() { |
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| 27 | crCongestion = new ArrayList<CrossRoadCongestion>(); |
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| 28 | updatedCongestion = new ArrayList<RoadSegmentCongestion>(); |
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| 29 | isLastWeekSet = false; |
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| 30 | } |
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| 31 | |
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| 32 | // mediate real time data and store it into lastWeek db |
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| 33 | private void updateLastWeekCongestions(int day, int hour) { |
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| 34 | if (hour == 0) { // store to the previews hour entry; |
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| 35 | if (day > 0) { |
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| 36 | day--; |
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| 37 | hour = 23; |
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| 38 | } else { |
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| 39 | return; |
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| 40 | } |
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| 41 | } else { |
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| 42 | hour--; |
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| 43 | } |
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| 44 | for (int i = 0; i < crCongestion.size(); i++) { |
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| 45 | crCongestion.get(i).updateLastWeekCongestion(day, hour); |
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| 46 | } |
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| 47 | } |
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| 48 | |
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| 49 | // make last week public by storing it in Globals.lastWeekCongestions |
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| 50 | private void publishLastWeekCongestions() { |
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| 51 | ArrayList<ArrayList<WeekCongestion>> lastWeekCongestions = new ArrayList<ArrayList<WeekCongestion>>(); |
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| 52 | for (int i = 0; i < crCongestion.size(); i++) { |
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| 53 | lastWeekCongestions.add(crCongestion.get(i).cloneLastWeek()); |
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| 54 | } |
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| 55 | Globals.lastWeekCongestions = lastWeekCongestions; |
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| 56 | isLastWeekSet = true; |
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| 57 | } |
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| 58 | |
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| 59 | // set real time data |
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| 60 | public void setCongestion(int crossIndex, int segmentIndex, int crtTime, |
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| 61 | Double congestion) { |
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| 62 | crCongestion.get(crossIndex).setCongestion(segmentIndex, congestion); |
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| 63 | if (isLastWeekSet) { |
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| 64 | int time = crtTime / kTimeCompression; // secs |
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| 65 | time = time / 3600; // hours |
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| 66 | int hour = time % 24; |
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| 67 | time = time / 24; // days |
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| 68 | int day = time % 7; |
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| 69 | Double lastCongestion = crCongestion.get(crossIndex) |
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| 70 | .getLastWeekCongestion(segmentIndex, day, hour); |
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| 71 | RoadSegmentCongestion rsc = new RoadSegmentCongestion(crossIndex, |
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| 72 | segmentIndex, congestion); |
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| 73 | if (isDifferent(congestion, lastCongestion)) { |
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| 74 | RoadSegmentCongestion existingRSC = null; |
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| 75 | for (int i = 0; i < updatedCongestion.size(); i++) { |
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| 76 | if (updatedCongestion.get(i).equals(rsc)) { |
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| 77 | existingRSC = updatedCongestion.get(i); |
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| 78 | break; |
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| 79 | } |
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| 80 | } |
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| 81 | if (existingRSC == null) { // entry does not exist -> add |
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| 82 | // congestion |
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| 83 | updatedCongestion.add(rsc); |
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| 84 | broadcastUpdatedCongestions(); |
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| 85 | } else { |
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| 86 | if (isDifferent(congestion, existingRSC.getCongestion())) { |
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| 87 | existingRSC.setCongestion(congestion); |
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| 88 | broadcastUpdatedCongestions(); |
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| 89 | } |
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| 90 | } |
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| 91 | } else { |
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| 92 | for (int i = 0; i < updatedCongestion.size(); i++) { |
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| 93 | if (updatedCongestion.get(i).equals(rsc)) { |
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| 94 | updatedCongestion.remove(i); |
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| 95 | broadcastUpdatedCongestions(); |
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| 96 | break; |
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| 97 | } |
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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 | private boolean isDifferent(Double current, Double previous) { |
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| 104 | return (Math.abs(current - previous) > kCongestionThresh); |
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| 105 | } |
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| 106 | |
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| 107 | private void broadcastUpdatedCongestions() { |
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| 108 | ArrayList<RoadSegmentCongestion> toSend = new ArrayList<RoadSegmentCongestion>(); |
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| 109 | for (int i = 0; i < updatedCongestion.size(); i++) { |
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| 110 | toSend.add(updatedCongestion.get(i).clone()); |
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| 111 | } |
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| 112 | IntersectionNode in; |
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| 113 | for (int i = 0; i < crCongestion.size(); i++) { |
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| 114 | in = crCongestion.get(i).getIntersectionNode(); |
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| 115 | in.updateCongestions(toSend); |
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| 116 | } |
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| 117 | } |
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| 118 | |
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| 119 | // IntersectionNode subscribes to the server for server replies |
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| 120 | public int addIntersectionNode(IntersectionNode inode) { |
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| 121 | crCongestion.add(new CrossRoadCongestion(inode)); |
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| 122 | return crCongestion.size() - 1; |
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| 123 | } |
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| 124 | |
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| 125 | // to be called after the Intersection nodes were registered to the server |
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| 126 | public void init() { |
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| 127 | if (!isLastWeekSet) { |
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| 128 | isLastWeekSet = loadCongestions(null); |
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| 129 | publishLastWeekCongestions(); |
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| 130 | } |
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| 131 | } |
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| 132 | |
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| 133 | public void step(int crtTime) { |
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| 134 | if (crtTime % kTimeCompression != 0) { |
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| 135 | return; |
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| 136 | } |
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| 137 | int time = crtTime / kTimeCompression; // seconds |
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| 138 | time = time / 3600; // hours |
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| 139 | int hour = time % 24; |
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| 140 | time = time / 24; // days |
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| 141 | int day = time % 7; |
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| 142 | time = crtTime / kTimeCompression; |
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| 143 | |
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| 144 | // for each hour |
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| 145 | if (time % 3600 == 0) { |
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| 146 | updateLastWeekCongestions(day, hour); |
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| 147 | updatedCongestion.clear(); |
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| 148 | broadcastUpdatedCongestions(); |
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| 149 | } |
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| 150 | |
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| 151 | // for each week |
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| 152 | //if (time % 604800 == 0) { |
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| 153 | if (time % 86400 == 0) { |
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| 154 | saveCongestions(null); |
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| 155 | publishLastWeekCongestions(); |
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| 156 | } |
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| 157 | } |
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| 158 | |
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| 159 | // save lastWeek congestion into filename file |
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| 160 | private boolean saveCongestions(String filename) { |
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| 161 | if (filename == null) { |
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| 162 | filename = System.getProperty("user.home") + File.separatorChar + "maps" + |
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| 163 | File.separatorChar + "rt" + File.separatorChar + Globals.scenarioName + ".cng.txt"; |
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| 164 | } |
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| 165 | BufferedWriter out = null; |
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| 166 | try { |
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| 167 | out = new BufferedWriter(new FileWriter(filename)); |
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| 168 | String str; |
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| 169 | StringTokenizer st; |
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| 170 | |
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| 171 | out.write("crosses_nb " + crCongestion.size()); |
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| 172 | out.newLine(); |
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| 173 | for (int i = 0; i < crCongestion.size(); i++) { |
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| 174 | out.write("cross " + i); |
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| 175 | out.newLine(); |
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| 176 | str = crCongestion.get(i).toString(); |
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| 177 | st = new StringTokenizer(str, "\n"); |
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| 178 | while (st.hasMoreTokens()) { |
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| 179 | out.write(st.nextToken()); |
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| 180 | out.newLine(); |
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| 181 | } |
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| 182 | } |
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| 183 | out.close(); |
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| 184 | } catch (IOException e) { |
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| 185 | System.out.println("Could not save congestion file " + filename); |
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| 186 | return false; |
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| 187 | } |
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| 188 | return true; |
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| 189 | } |
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| 190 | |
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| 191 | // load lastWeek congestion from filename |
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| 192 | private boolean loadCongestions(String filename) { |
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| 193 | if (filename == null) { |
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| 194 | filename = System.getProperty("user.home") + File.separatorChar + "maps" + |
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| 195 | File.separatorChar + "rt" + File.separatorChar + Globals.scenarioName + ".cng.txt"; |
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| 196 | } |
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| 197 | BufferedReader in = null; |
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| 198 | try { |
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| 199 | in = new BufferedReader(new FileReader(filename)); |
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| 200 | String line = ""; |
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| 201 | StringTokenizer st; |
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| 202 | |
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| 203 | int crossIndex, segmentIndex, day, hour; |
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| 204 | int crosses_nb, segments_nb; |
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| 205 | Double congestion; |
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| 206 | |
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| 207 | line = in.readLine(); |
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| 208 | while (line != null) { |
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| 209 | st = new StringTokenizer(line, " "); |
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| 210 | st.nextToken(); // crosses_nb |
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| 211 | crosses_nb = Integer.parseInt(st.nextToken()); |
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| 212 | for (crossIndex = 0; crossIndex < crosses_nb; crossIndex++) { |
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| 213 | line = in.readLine(); // cross i |
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| 214 | line = in.readLine(); |
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| 215 | st = new StringTokenizer(line, " "); |
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| 216 | st.nextToken(); // segments_nb; |
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| 217 | segments_nb = Integer.parseInt(st.nextToken()); |
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| 218 | for (segmentIndex = 0; segmentIndex < segments_nb; segmentIndex++) { |
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| 219 | line = in.readLine(); // segment i |
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| 220 | for (day = 0; day < 7; day++) { |
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| 221 | line = in.readLine(); |
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| 222 | st = new StringTokenizer(line, " "); |
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| 223 | for (hour = 0; hour < 24; hour++) { |
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| 224 | congestion = Double.parseDouble(st.nextToken()); |
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| 225 | crCongestion.get(crossIndex) |
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| 226 | .setLastWeekCongestion(segmentIndex, |
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| 227 | day, hour, congestion); |
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| 228 | } |
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| 229 | } |
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| 230 | } |
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| 231 | } |
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| 232 | line = in.readLine(); |
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| 233 | } |
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| 234 | in.close(); |
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| 235 | } catch (IOException e) { |
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| 236 | System.out.println("Could not load congestion file " + filename); |
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| 237 | return false; |
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| 238 | } |
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| 239 | return true; |
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| 240 | } |
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| 241 | } |
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