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// 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
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (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;
}
}
}
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