public List <string> RequestPointsRegionsKeys(Pair topLeftCorner,
Pair bottomRightCorner,
int zoomLevel,
string username,
string dataSet)
{
//todo: cache the header
PointsDataSetHeader dataSetHeader = this.userRepository.GetDatasetHeader(username, dataSet);
if (dataSetHeader == null)
{
throw new ApplicationException($"User do not have a dataset with name {dataSet}");
}
//set the requested latitude and longitude coordinates of corners in the available limits of the dataset
var topLeftIndexes = this.dataPointsRegionSource.GetRegionIndexes(
topLeftCorner.Item1 <(dataSetHeader.MaximumLatitude ?? 90m) ? topLeftCorner.Item1 : dataSetHeader.MaximumLatitude ?? 90m,
topLeftCorner.Item2> (dataSetHeader.MinimumLongitude ?? -180m) ? topLeftCorner.Item2 : dataSetHeader.MinimumLongitude ?? -180m,
zoomLevel);
var bottomRightIndexes = this.dataPointsRegionSource.GetRegionIndexes(
bottomRightCorner.Item1 > (dataSetHeader.MinimumLatitude ?? -90m) ? bottomRightCorner.Item1 : (dataSetHeader.MinimumLatitude ?? -90m),
bottomRightCorner.Item2 < (dataSetHeader.MaximumLongitude ?? 180m) ? bottomRightCorner.Item2 : (dataSetHeader.MaximumLongitude ?? 180m),
zoomLevel);
return(PointsCacheManager.GetKeys(topLeftIndexes, bottomRightIndexes, zoomLevel, dataSetHeader.ID));
}
private static List <string> getCacheKeys(Tuple <int, int> from, Tuple <int, int> to, int zoomLevel, int datasetId, out List <Region> requiredPoints)
{
List <string> result = new List <string>();
requiredPoints = new List <Region>();
for (int i = from.Item1; i <= to.Item1; i += 1)
{
for (int j = from.Item2; j <= to.Item2; j += 1)
{
string key = generateKey(i, j, zoomLevel, datasetId);
var cacheValue = MemoryCache.Default.Get(key);
//if the key was not found as entry in cache, request the points and create an entry
//which is identified as 'creating'
if (cacheValue == null)
{
requiredPoints.Add(new Region(i, j, zoomLevel));
PointsCacheManager.Create(i, j, zoomLevel, datasetId);
}
else
{
result.Add(key);
}
}
}
return(result);
}
/// <summary>
/// Returns data points regions which are inside a specific area of screen for a zoom level.
/// Limits unit of measure with latitude/longitude.
/// Points zones source is Cassandra
/// </summary>
/// <param name="topLeftCorner"></param>
/// <param name="bottomRightCorner"></param>
/// <param name="username"></param>
/// <param name="dataSet"></param>
/// <param name="cachedRegions">A list of regions keys which are cached on browser</param>
/// <param name="callback"></param>
/// <returns></returns>
public void RequestDomainPointsRegions(Pair topLeftCorner,
Pair bottomRightCorner,
int zoomLevel,
string username,
string dataSet,
string[] cachedRegions,
Action <IEnumerable <PointBase>, string> callback)
{
//todo: cache the header
PointsDataSetHeader datasetHeader = this.userRepository.GetDatasetHeader(username, dataSet);
if (datasetHeader == null)
{
throw new ApplicationException($"User do not have a dataset with name {dataSet}");
}
//set the requested latitude and longitude coordinates of corners in the available limits of the dataset
var topLeftIndexes = this.dataPointsRegionSource.GetRegionIndexes(
topLeftCorner.Item1 <(datasetHeader.MaximumLatitude ?? 90m) ? topLeftCorner.Item1 : datasetHeader.MaximumLatitude ?? 90m,
topLeftCorner.Item2> (datasetHeader.MinimumLongitude ?? -180m) ? topLeftCorner.Item2 : datasetHeader.MinimumLongitude ?? -180m,
zoomLevel);
var bottomRightIndexes = this.dataPointsRegionSource.GetRegionIndexes(
bottomRightCorner.Item1 > (datasetHeader.MinimumLatitude ?? -90m) ? bottomRightCorner.Item1 : (datasetHeader.MinimumLatitude ?? -90m),
bottomRightCorner.Item2 < (datasetHeader.MaximumLongitude ?? 180m) ? bottomRightCorner.Item2 : (datasetHeader.MaximumLongitude ?? 180m),
zoomLevel);
var serverCachedRegions = PointsCacheManager.Get(topLeftIndexes,
bottomRightIndexes,
zoomLevel,
datasetHeader.ID,
cachedRegions,
out List <Coordinates> requiredRegions);
if (requiredRegions != null)
{
Parallel.ForEach(requiredRegions, coordinate =>
{
try
{
var result = this.dataPointsRepository.GetRegion(datasetHeader.ID, coordinate.Item1, coordinate.Item2, zoomLevel);
string regionKey = null;
if (result != null)
{
regionKey = PointsCacheManager.Write(coordinate.Item1, coordinate.Item2, coordinate.Item3, datasetHeader.ID, result.Points);
}
callback(result == null ? new List <PointBase>() : result.Points, regionKey);
}
catch (Exception exception)
{
CoreContainers.LogsRepository.LogError(exception, Core.Database.Logs.LogTrigger.Domain);
//if a error ocurs, the created entry must be deleted from the cache
PointsCacheManager.Remove(coordinate.Item1, coordinate.Item2, coordinate.Item3, datasetHeader.ID);
}
});
}
foreach (var pointsZonePair in serverCachedRegions)
{
callback(pointsZonePair.Item1, pointsZonePair.Item2);
}
}