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using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.BL;
using Tango.Telemetry.Mappers;
using Tango.Telemetry.Telemetries;
namespace Tango.Telemetry.Sources
{
public class TelemetryEventsHistorySource : ITelemetryHistorySource
{
private bool _isBusy;
public TelemetryHistorySourceDirection Direction { get; } = TelemetryHistorySourceDirection.Descending;
public string Name { get; } = "Events History";
public bool RequiresTelemetryDuplicationTracking { get; } = true;
public async Task<bool> CanRequestHistory(DateTime from)
{
if (_isBusy)
{
return false;
}
else
{
try
{
using (ObservablesContext db = ObservablesContext.CreateDefault())
{
return await db.MachinesEvents.CountAsync(x => x.LastUpdated < from) > 0;
}
}
catch
{
return false;
}
}
}
public async Task<IEnumerable<ITelemetry>> RequestHistory(DateTime from)
{
try
{
_isBusy = true;
using (ObservablesContext db = ObservablesContext.CreateDefault())
{
var events = await db.MachinesEvents
.OrderByDescending(x => x.LastUpdated)
.Where(x => x.LastUpdated < from)
.Take(10)
.ToListAsync();
List<TelemetryEvent> tRuns = new List<TelemetryEvent>();
foreach (var ev in events)
{
var tEvent = EventMapper.MapEvent(ev);
tRuns.Add(tEvent);
}
return tRuns;
}
}
finally
{
_isBusy = false;
}
}
public void Dispose()
{
}
}
}
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