private IEnumerable <Point> GetResultsFromQuery(GeoQueryResult result)
{
return(from item in result.Items
let geoJsonString = item["geoJson"].S
let point = JsonConvert.DeserializeObject <GeoPoint>(geoJsonString)
select new Point
{
lat = point.lat,
lng = point.lng
});
}
private IEnumerable <SchoolSearchResult> GetResultsFromQuery(GeoQueryResult result)
{
var dtos = from item in result.Items
let geoJsonString = item[_config.GeoJsonAttributeName].S
let point = JsonConvert.DeserializeObject <GeoPoint>(geoJsonString)
select new SchoolSearchResult
{
Latitude = point.Latitude,
Longitude = point.Longitude,
RangeKey = item[_config.RangeKeyAttributeName].S,
SchoolName = item.ContainsKey("schoolName") ? item["schoolName"].S : string.Empty
};
return(dtos);
}
private async Task <GeoQueryResult> DispatchQueries(IEnumerable <GeohashRange> ranges, GeoQueryRequest geoQueryRequest, CancellationToken cancellationToken)
{
var geoQueryResult = new GeoQueryResult();
var futureList = new List <Task>();
var internalSource = new CancellationTokenSource();
var internalToken = internalSource.Token;
var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, internalToken);
foreach (var outerRange in ranges)
{
foreach (var range in outerRange.TrySplit(_config.HashKeyLength))
{
var task = RunGeoQuery(geoQueryRequest, geoQueryResult, range, cts.Token);
futureList.Add(task);
}
}
Exception inner = null;
try
{
for (var i = 0; i < futureList.Count; i++)
{
try
{
await futureList[i].ConfigureAwait(false);
}
catch (Exception e)
{
inner = e;
// cancel the others
internalSource.Cancel(true);
}
}
}
catch (Exception ex)
{
inner = inner ?? ex;
throw new ClientException("Querying Amazon DynamoDB failed.", inner);
}
return(geoQueryResult);
}
private IEnumerable <PhotoData> GetResultsFromQuery(GeoQueryResult result)
{
var dtos = from item in result.Items
let geoJsonString = item[_config.GeoJsonAttributeName].S
let point = JsonConvert.DeserializeObject <GeoPoint>(geoJsonString)
select new PhotoDataModel
{
rangeKey = item[_config.RangeKeyAttributeName].S,
lat = point.Latitude,
lng = point.Longitude,
imgUrl = item.ContainsKey("imgUrl") ? item["imgUrl"].S : string.Empty,
imgUrlLarge = item.ContainsKey("imgUrlLarge") ? item["imgUrlLarge"].S : string.Empty
};
return(dtos);
}
private IEnumerable <resultsModel> GetResultsFromQuery(GeoQueryResult result)
{
var dtos = from item in result.Items
let geoJsonString = item[_config.GeoJsonAttributeName].S
let point = JsonConvert.DeserializeObject <GeoPoint>(geoJsonString)
select new resultsModel
{
Latitude = point.Latitude,
Longitude = point.Longitude,
RangeKey = item[_config.RangeKeyAttributeName].S,
// zipcode = item.ContainsKey("zipcode") ? item["zipcode"].S : string.Empty,
// Title = item.ContainsKey("Title") ? item["Title"].S : string.Empty
};
return(dtos);
}
private async Task RunGeoQuery(GeoQueryRequest request, GeoQueryResult geoQueryResult, GeohashRange range, CancellationToken cancellationToken)
{
var queryRequest = request.QueryRequest.CopyQueryRequest();
var hashKey = S2Manager.GenerateHashKey(range.RangeMin, _config.HashKeyLength);
var results = await _dynamoDBManager.QueryGeohashAsync(queryRequest, hashKey, range, cancellationToken).ConfigureAwait(false);
foreach (var queryResult in results)
{
cancellationToken.ThrowIfCancellationRequested();
// This is a concurrent collection
geoQueryResult.QueryResults.Add(queryResult);
var filteredQueryResult = Filter(queryResult.Items, request);
// this is a concurrent collection
foreach (var r in filteredQueryResult)
{
geoQueryResult.Items.Add(r);
}
}
}
