/**
* Returns true if key is valid. Uses cache of keys so doesn't have to access database each time.
* If key not in cache then will reread keys from database in case it was just added. But won't do
* so more than every few seconds since more frequent access could allow an app with a bad key to
* cause the db to be queried to often putting an unneeded burden on the db.
*
* <p>Synchronized because can have simultaneous access and using a cache.
*
* @param key The key to investigate
* @return True if key is valid
*/
public synchronized boolean isKeyValid(String key) {
try {
// If key is already in cache return true
if (apiKeyCache.get(key) != null) return true;
// Want to make sure a user doesn't overwhelm the system by
// repeatedly trying to use an invalid key. So if the cache was
// just updated a few x seconds ago then don't update it again
// right now. Simply return false.
if (System.currentTimeMillis()
< lastTimeKeysReadIntoCache + lastTimeKeysReadLimitSec.getValue() * Time.MS_PER_SEC)
return false;
lastTimeKeysReadIntoCache = System.currentTimeMillis();
// Key wasn't in cache so update the cache in case it was added
apiKeyCache.clear();
for (ApiKey apiKey : getApiKeys()) {
apiKeyCache.put(apiKey.getKey(), apiKey);
}
return apiKeyCache.get(key) != null;
} catch (Exception e) {
logger.error("Problem checking key \"{}\" to see if valid.", key, e);
return false;
}
}
/**
* Called when AVL data is read from URL. Processes the JSON data and calls processAvlReport() for
* each AVL report.
*/
@Override
protected Collection<AvlReport> processData(InputStream in) throws Exception {
// Get the JSON string containing the AVL data
String jsonStr = getJsonString(in);
try {
// Convert JSON string to a JSON object
JSONObject jsonObj = new JSONObject(jsonStr);
// The JSON feed is really odd. Instead of having an
// array of vehicles there is a separate JSON object
// for each vehicle, and the name of the object is the
// trip ID. Therefore need to get names of all the objects
// so that each one can be accessed by name.
String tripNames[] = JSONObject.getNames(jsonObj);
// The return value for the method
Collection<AvlReport> avlReportsReadIn = new ArrayList<AvlReport>();
// For each vehicle...
for (String tripName : tripNames) {
JSONObject v = jsonObj.getJSONObject(tripName);
// Create the AvlReport from the JSON data
String vehicleId = Integer.toString(v.getInt("vehicle_id"));
Double lat = v.getDouble("vehicle_lat");
Double lon = v.getDouble("vehicle_lon");
// Guessing that the speed is in mph since getting values up to 58.
// Therefore need to convert to m/s.
float speed = (float) v.getDouble("vehicle_speed") * Geo.MPH_TO_MPS;
// Not sure if bearing is the same as heading.
float heading = (float) v.getDouble("vehicle_bearing");
// The time is really strange. It is off by 4-5 hours for some
// strange reason. It appears to be 4 hours off during daylight
// savings time but 5 hours during normal winter hours. Yikes!
// Therefore using the parameter keolisFeedAvlTimeOffset to
// specify the offset.
long gpsTime =
v.getLong("vehicle_timestamp") * Time.MS_PER_SEC
+ keolisFeedAvlTimeOffset.getValue() * Time.HOUR_IN_MSECS;
// Create the AvlReport
AvlReport avlReport = new AvlReport(vehicleId, gpsTime, lat, lon, speed, heading, "Keolis");
// Need to set assignment info separately. Unfortunately the
// trip ID in the Keolis feed doesn't correspond exactly to the
// trip IDs in the GTFS data. In Keolis feed it will be
// something like "CR-FRAMINGHAM-Weekday-515" but in GTFS it will
// be "CR-Worcester-CR-Weekday-Worcester-Jun15-515". Therefore
// it is best to just use the trip short name, such as "515".
String tripShortName = tripName.substring(tripName.lastIndexOf('-') + 1);
// Actually set the assignment
avlReport.setAssignment(tripShortName, AssignmentType.TRIP_SHORT_NAME);
logger.debug("From KeolisAvlModule {}", avlReport);
if (shouldProcessAvl) {
avlReportsReadIn.add(avlReport);
}
}
// Return all the AVL reports read in
return avlReportsReadIn;
} catch (JSONException e) {
logger.error("Error parsing JSON. {}. {}", e.getMessage(), jsonStr, e);
return new ArrayList<AvlReport>();
}
}
