/// <summary>
/// This method handles the task of calling the remote gRPC Service ListFeatures by passing a Message Type of
/// Rectangle which contains (2) Points. The result is a gRPC response STREAM of Feature Message Types.
/// </summary>
/// <param name="areaOfInterest">A Routeguide Rectangle containing two Points</param>
/// <returns></returns>
public async Task ListFeatures(Routeguide.Rectangle areaOfInterest)
{
Debug.Log("ListFeatures Client Lo latitude: " + areaOfInterest.Lo.Latitude +
", Lo longitude: " + areaOfInterest.Lo.Longitude + "\n" +
", Hi latitude: " + areaOfInterest.Hi.Latitude +
", Hi longitude: " + areaOfInterest.Hi.Longitude);
StringBuilder responseText = new StringBuilder();
try
{
var cts = new CancellationTokenSource(TimeSpan.FromSeconds(5));
//Sending and Receiving will be sequential - send first, then receive stream response second
var response = _client.ListFeatures(areaOfInterest, cancellationToken: cts.Token);
while (await response.ResponseStream.MoveNext())
{
var thisItemName = response.ResponseStream.Current.Name;
if (!String.IsNullOrEmpty(thisItemName))
{
_myRouteGuideUiHandler.AddTextToUi(thisItemName, false);
}
}
}
catch (RpcException e)
{
_myRouteGuideUiHandler.AddTextToUi("ListFeatures Service is unavailable. " + e.Message, false);
}
#if DEBUG
Debug.Log("async Task ListFeatures Finished");
#endif
}
/// <summary>
/// Server-streaming example. Calls listFeatures with a rectangle of interest. Prints each response feature as it arrives.
/// </summary>
public async Task ListFeatures(int lowLat, int lowLon, int hiLat, int hiLon)
{
try
{
Log("***Server-streaming example. Calls listFeatures with a rectangle of interest. Prints each response feature as it arrives. ListFeatures: lowLat={0} lowLon={1} hiLat={2} hiLon={3}", lowLat, lowLon, hiLat,
hiLon);
Log("*** ListFeatures: lowLat={0} lowLon={1} hiLat={2} hiLon={3}", lowLat, lowLon, hiLat,
hiLon);
Rectangle request = new Rectangle
{
Lo = new Point {
Latitude = lowLat, Longitude = lowLon
},
Hi = new Point {
Latitude = hiLat, Longitude = hiLon
}
};
using (var call = client.ListFeatures(request))
{
var responseStream = call.ResponseStream;
StringBuilder responseLog = new StringBuilder("Result: ");
while (await responseStream.MoveNext())
{
Feature feature = responseStream.Current;
responseLog.Append(feature.ToString());
}
Log(responseLog.ToString());
}
}
catch (RpcException e)
{
Log("RPC failed " + e);
throw;
}
}
private static async Task TestListFeaturesAsync(Channel channel, int deltaLatitude = 5, int deltaLongitude = 5, CancellationToken cancellationToken = default)
{
var client = new RouteGuide.RouteGuideClient(channel);
const int longitude = 34;
const int latitude = 1;
using (var request = client.ListFeatures(new Rectangle()
{
Lo = new Point()
{
Latitude = latitude, Longitude = longitude
}
, Hi = new Point()
{
Latitude = latitude + deltaLatitude, Longitude = longitude + deltaLongitude
}
}, cancellationToken: cancellationToken))
{
try
{
bool hasNext = await request.ResponseStream.MoveNext(cancellationToken).ConfigureAwait(false);
while (hasNext)
{
//Console.WriteLine($"status: {request.GetStatus()}"); status can only be accessed once the call has finished
Console.WriteLine(request.ResponseStream.Current.Name);
hasNext = await request.ResponseStream.MoveNext(cancellationToken).ConfigureAwait(false);
}
}
catch (RpcException e)
{
Console.WriteLine($"request status: {request.GetStatus()}");
Console.WriteLine($"ex status: {e.Status}");
}
}
}