@Override
public void run() {
while (true) {
LatLng currentLocation = GPS.getCurrentLocation();
Date currentTime = new Date();
// update the cache if the distance from the last update has equalled or exceeded CACHE_RADIUS
// or the time from the last update is at least CACHE_TIMEOUT
if (GPS.calculateDistance(this.lastCachedLocation, currentLocation) >= CACHE_RADIUS
|| currentTime.getTime() - this.lastCachedTime.getTime() >= CACHE_TIMEOUT) {
try {
HazardManager.populateHazardSet(ServerInterface.getHazards(currentLocation));
} catch (IOException ioe) {
ioe.printStackTrace();
} catch (JSONException jsone) {
jsone.printStackTrace();
}
}
// remove hazards from the set of recently warned hazards if at least WARN_DELAY have passed
for (Iterator<Date> it = this.inactiveHazards.values().iterator(); it.hasNext(); ) {
Date nextDate = it.next();
if (currentTime.getTime() - nextDate.getTime() >= WARN_DELAY) it.remove();
}
// (I) update distance for active hazards or (II) move the hazard to inactiveHazards if we are
// more than WARN_DISTANCE away
synchronized (this.activeHazards) {
for (Iterator<Hazard> it = this.activeHazards.iterator(); it.hasNext(); ) {
Hazard h = it.next();
double distanceFromH = GPS.calculateDistance(h.getLatLong(), currentLocation);
if (distanceFromH <= WARN_DISTANCE) // (I)
PebbleSender.send(PebbleMessage.createUpdate(h, (int) distanceFromH));
else { // (II)
PebbleSender.send(PebbleMessage.createIgnore(h));
this.inactiveHazards.put(h, currentTime);
it.remove();
}
}
}
// copy hazards to activeHazards if we are at most WARN_DISTANCE away and the hazard is not in
// inactiveHazards
for (Hazard h : HazardManager.getHazardSet()) {
double distanceFromH = GPS.calculateDistance(h.getLatLong(), currentLocation);
if (distanceFromH <= WARN_DISTANCE && !this.inactiveHazards.keySet().contains(h)) {
PebbleSender.send(PebbleMessage.createAlert(h, (int) distanceFromH));
this.activeHazards.add(h);
}
}
try {
if (runState == RunState.ACTIVE) Thread.sleep(LOOP_DELAY_ACTIVE);
else Thread.sleep(LOOP_DELAY_INACTIVE);
} catch (InterruptedException ie) {
break;
}
}
}
public RunLoop() {
this.runState = RunState.INACTIVE;
LatLng currentLocation = GPS.getCurrentLocation();
try {
HazardManager.populateHazardSet(ServerInterface.getHazards(currentLocation));
} catch (IOException ioe) {
ioe.printStackTrace();
} catch (JSONException jsone) {
jsone.printStackTrace();
}
this.lastCachedLocation = currentLocation;
this.lastCachedTime = new Date();
this.activeHazards = Collections.synchronizedSet(new LinkedHashSet<Hazard>());
this.inactiveHazards = new LinkedHashMap<Hazard, Date>();
}