| // Copyright 2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| using System; |
| using System.Collections.Concurrent; |
| using System.Collections.Generic; |
| using System.Diagnostics; |
| using System.Linq; |
| using System.Text; |
| using System.Threading.Tasks; |
| |
| using Grpc.Core; |
| using Grpc.Core.Utils; |
| |
| namespace Routeguide |
| { |
| /// <summary> |
| /// Example implementation of RouteGuide server. |
| /// </summary> |
| public class RouteGuideImpl : RouteGuide.RouteGuideBase |
| { |
| readonly List<Feature> features; |
| readonly object myLock = new object(); |
| readonly Dictionary<Point, List<RouteNote>> routeNotes = new Dictionary<Point, List<RouteNote>>(); |
| |
| public RouteGuideImpl(List<Feature> features) |
| { |
| this.features = features; |
| } |
| |
| /// <summary> |
| /// Gets the feature at the requested point. If no feature at that location |
| /// exists, an unnammed feature is returned at the provided location. |
| /// </summary> |
| public override Task<Feature> GetFeature(Point request, ServerCallContext context) |
| { |
| return Task.FromResult(CheckFeature(request)); |
| } |
| |
| /// <summary> |
| /// Gets all features contained within the given bounding rectangle. |
| /// </summary> |
| public override async Task ListFeatures(Rectangle request, IServerStreamWriter<Feature> responseStream, ServerCallContext context) |
| { |
| var responses = features.FindAll( (feature) => feature.Exists() && request.Contains(feature.Location) ); |
| foreach (var response in responses) |
| { |
| await responseStream.WriteAsync(response); |
| } |
| } |
| |
| /// <summary> |
| /// Gets a stream of points, and responds with statistics about the "trip": number of points, |
| /// number of known features visited, total distance traveled, and total time spent. |
| /// </summary> |
| public override async Task<RouteSummary> RecordRoute(IAsyncStreamReader<Point> requestStream, ServerCallContext context) |
| { |
| int pointCount = 0; |
| int featureCount = 0; |
| int distance = 0; |
| Point previous = null; |
| var stopwatch = new Stopwatch(); |
| stopwatch.Start(); |
| |
| while (await requestStream.MoveNext()) |
| { |
| var point = requestStream.Current; |
| pointCount++; |
| if (CheckFeature(point).Exists()) |
| { |
| featureCount++; |
| } |
| if (previous != null) |
| { |
| distance += (int) previous.GetDistance(point); |
| } |
| previous = point; |
| } |
| |
| stopwatch.Stop(); |
| |
| return new RouteSummary |
| { |
| PointCount = pointCount, |
| FeatureCount = featureCount, |
| Distance = distance, |
| ElapsedTime = (int)(stopwatch.ElapsedMilliseconds / 1000) |
| }; |
| } |
| |
| /// <summary> |
| /// Receives a stream of message/location pairs, and responds with a stream of all previous |
| /// messages at each of those locations. |
| /// </summary> |
| public override async Task RouteChat(IAsyncStreamReader<RouteNote> requestStream, IServerStreamWriter<RouteNote> responseStream, ServerCallContext context) |
| { |
| while (await requestStream.MoveNext()) |
| { |
| var note = requestStream.Current; |
| List<RouteNote> prevNotes = AddNoteForLocation(note.Location, note); |
| foreach (var prevNote in prevNotes) |
| { |
| await responseStream.WriteAsync(prevNote); |
| } |
| } |
| } |
| |
| /// <summary> |
| /// Adds a note for location and returns a list of pre-existing notes for that location (not containing the newly added note). |
| /// </summary> |
| private List<RouteNote> AddNoteForLocation(Point location, RouteNote note) |
| { |
| lock (myLock) |
| { |
| List<RouteNote> notes; |
| if (!routeNotes.TryGetValue(location, out notes)) { |
| notes = new List<RouteNote>(); |
| routeNotes.Add(location, notes); |
| } |
| var preexistingNotes = new List<RouteNote>(notes); |
| notes.Add(note); |
| return preexistingNotes; |
| } |
| } |
| |
| /// <summary> |
| /// Gets the feature at the given point. |
| /// </summary> |
| /// <param name="location">the location to check</param> |
| /// <returns>The feature object at the point Note that an empty name indicates no feature.</returns> |
| private Feature CheckFeature(Point location) |
| { |
| var result = features.FirstOrDefault((feature) => feature.Location.Equals(location)); |
| if (result == null) |
| { |
| // No feature was found, return an unnamed feature. |
| return new Feature { Name = "", Location = location }; |
| } |
| return result; |
| } |
| } |
| } |