public override async Task StartMonitoring(GeofenceRegion region)
{
var access = await this.RequestAccess();
access.Assert();
var native = region.ToNative();
var tcs = new TaskCompletionSource <object>();
UIApplication.SharedApplication.BeginInvokeOnMainThread(async() =>
{
try
{
this.locationManager.StartMonitoring(native);
tcs.SetResult(null);
}
catch (Exception ex)
{
this.locationManager.StopMonitoring(native);
tcs.SetException(ex);
}
});
await tcs.Task.ConfigureAwait(false);
await this.Repository.Set(region.Identifier, region);
}
public override async Task <GeofenceState> RequestState(GeofenceRegion region, CancellationToken cancelToken = default)
{
var task = this.gdelegate
.WhenStateDetermined()
.Where(x => region.Equals(x))
.Select(x => x.Status)
.Timeout(TimeSpan.FromSeconds(20))
.ToTask(cancelToken);
this.locationManager.RequestState(region.ToNative());
var result = await task.ConfigureAwait(false);
return(result);
}
public override async Task <GeofenceState> RequestState(GeofenceRegion region, CancellationToken cancelToken = default)
{
var task = Observable
.FromEventPattern <CLRegionStateDeterminedEventArgs>(
x => this.gdelegate.DeterminedState += x,
x => this.gdelegate.DeterminedState -= x
)
.Timeout(TimeSpan.FromSeconds(20))
.Take(1)
.Select(x => x.EventArgs)
.Where(x => x.Region is CLRegion native && native.Identifier.Equals(region.Identifier))
.ToTask(cancelToken);
this.locationManager.RequestState(region.ToNative());
var args = await task;
return(args.State.FromNative());
}
public override async Task <GeofenceState> RequestState(GeofenceRegion region, CancellationToken cancelToken = default)
{
var task = this.gdelegate
.WhenStateDetermined()
.Where(x => region.Equals(x))
.Select(x => x.Status)
.Timeout(TimeSpan.FromSeconds(20))
.ToTask(cancelToken);
this.locationManager.RequestState(region.ToNative());
try
{
var result = await task.ConfigureAwait(false);
return(result);
}
catch (TimeoutException ex)
{
throw new TimeoutException("Could not retrieve latest GPS coordinates to be able to determine geofence current state", ex);
}
}
public override async Task StopMonitoring(GeofenceRegion region)
{
await this.Repository.Remove(region.Identifier);
this.locationManager.StopMonitoring(region.ToNative());
}