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For some use cases it makes sense to fetch all the fences at once in the beginning, so we want to have an endpoint to list all fences from a certain group.
@ApiMethod(name = "list", httpMethod = "get", path = "list")
public ArrayList < MyFence > listFences(@Named("group") String group) {
ArrayList < MyFence > fences = new ArrayList < MyFence > ();
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
Key fenceKey = KeyFactory.createKey("Geofence", group);
Query query = new Query("Fence", fenceKey).addSort("id", Query.SortDirection.DESCENDING);
List < Entity > fencesFromStore = datastore.prepare(query).asList(FetchOptions.Builder.withDefaults());
if (fencesFromStore.isEmpty()) {
return fences;
} else {
for (Entity fenceFromStore: fencesFromStore) {
long id = (long) fenceFromStore.getProperty("id");
String name = (String) fenceFromStore.getProperty("name");
String description = (String) fenceFromStore.getProperty("description");
Gson gson = new Gson();
Text vText = (Text) fenceFromStore.getProperty("vertices");
String vString = vText.getValue();
double[][] vertices = gson.fromJson(vString, double[][].class);
MyFence tempFence = new MyFence(id, name, group, description, vertices);
return fences;
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