/*
* this fetches the tour from the database or network
* if the tour db cache has timed out it will try to cache from network
* but if that fails revert to using the version cached in the DB
*/
private static void fetchTourHelper(final Context context, final Handler uiHandler) {
final TourDB tourDB = TourDB.getInstance(context);
if (tourDB.tourDetailsCached(TOUR_GUID, true)) {
List<TourHeader> tourHeaders = tourDB.retrieveTourHeaders();
sTour = new Tour(tourHeaders.get(0));
tourDB.populateTourDetails(sTour);
MobileWebApi.sendSuccessMessage(uiHandler);
return;
}
// check if stale version of tour exists in db
if (tourDB.tourDetailsCached(TOUR_GUID, false)) {
// stale version exists, so check if stale version is recent enough
MobileWebApi webApi = new MobileWebApi(false, false, null, context, null);
HashMap<String, String> query = new HashMap<String, String>();
query.put("module", "tours");
query.put("command", "toursList");
webApi.requestJSONArray(
query,
new JSONArrayResponseListener(new TourRefreshErrorListener(tourDB, uiHandler), null) {
@Override
public void onResponse(JSONArray array) throws ServerResponseException, JSONException {
Long lastModified = null;
for (int i = 0; i < array.length(); i++) {
JSONObject tourSummary = array.getJSONObject(i);
if (tourSummary.getString("id").equals(TOUR_GUID)) {
lastModified = tourSummary.getLong("last-modified") * 1000;
}
}
if (lastModified != null) {
if (lastModified < tourDB.tourDetailsLastUpdated(TOUR_GUID)) {
// cache is still fresh (use it, and mark it as fresh)
tourDB.markTourFresh(TOUR_GUID);
// retrieve tour from DB
List<TourHeader> tourHeaders = tourDB.retrieveTourHeaders();
sTour = new Tour(tourHeaders.get(0));
tourDB.populateTourDetails(sTour);
MobileWebApi.sendSuccessMessage(uiHandler);
return;
}
}
// tour is not up-to-date we need to update it.
fetchTourFromNetwork(context, uiHandler);
}
});
return;
}
// no fresh or stale version of tour exists must retrieve it from network
fetchTourFromNetwork(context, uiHandler);
}
