public IList <Message> GetMessagesNear(List <Message> messages,
GeoJsonPoint coords,
int radius = 100,
int skip = -1,
int limit = -1,
OrderDirection order = OrderDirection.None,
CancellationToken ct = default)
{
DistanceCalcuationMethod calc;
var queryResults = new List <Message>(messages.Count);
for (var idx = 0; idx < messages.Count; idx++)
{
queryResults.Add(null);
}
var results = queryResults;
if (radius >= ErrorMarginBoundary || messages.Count > MeasurementMargin)
{
calc = FastCalculateDistanceBetween;
}
else
{
calc = CalculateDistanceBetween;
}
var geoCoords = coords.ToCoordinates();
Parallel.For(0, messages.Count, (index, state) => {
double maxDist = radius;
var message = messages[index];
var dist = calc(geoCoords, message.Location.Coordinates);
if (dist > maxDist)
{
return;
}
results[index] = message;
});
queryResults.RemoveAll(x => x == null);
queryResults = order switch {
OrderDirection.Descending => queryResults.OrderByDescending(x => x.Timestamp).ToList(),
OrderDirection.Ascending => queryResults.OrderBy(x => x.Timestamp).ToList(),
_ => queryResults
};
if (skip > 0)
{
queryResults = queryResults.Skip(skip).ToList();
}
if (limit > 0)
{
queryResults = queryResults.Take(limit).ToList();
}
return(queryResults);
}
}
public async Task <PaginationResult <AuditLog> > FindAsync(
IEnumerable <string> uids,
string text,
RequestMethod method = RequestMethod.Any,
int skip = 0,
int limit = 0,
OrderDirection direction = OrderDirection.None
)
{
IQueryable <AuditLog> logs;
var rv = new PaginationResult <AuditLog>();
if (method == RequestMethod.Any)
{
if (text == null)
{
logs =
from log in this.Data
where uids.Contains(log.AuthorId)
select log;
}
else
{
logs =
from log in this.Data
where uids.Contains(log.AuthorId) &&
log.Route.Contains(text)
select log;
}
}
else
{
if (text == null)
{
logs = this.Data.Where(log => uids.Contains(log.AuthorId) && log.Method == method);
}
else
{
logs = this.Data.Where(log => uids.Contains(log.AuthorId) && log.Method == method && log.Route.Contains(text));
}
}
logs = direction switch {
OrderDirection.Ascending => logs.OrderBy(x => x.Timestamp),
OrderDirection.Descending => logs.OrderByDescending(x => x.Timestamp),
_ => logs
};
rv.Count = await logs.CountAsync().AwaitBackground();
if (skip > 0)
{
logs = logs.Skip(skip);
}
if (limit > 0)
{
logs = logs.Take(limit);
}
rv.Values = await logs.ToListAsync().AwaitBackground();
foreach (var log in rv.Values)
{
log.Timestamp = DateTime.SpecifyKind(log.Timestamp, DateTimeKind.Utc);
}
return(rv);
}
