1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
// 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.Utils;
namespace Routeguide
{
/// <summary>
/// Example implementation of RouteGuide server.
/// </summary>
public class RouteGuideImpl : RouteGuide.IRouteGuide
{
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 Task<Feature> GetFeature(Point request, Grpc.Core.ServerCallContext context)
{
return Task.FromResult(CheckFeature(request));
}
/// <summary>
/// Gets all features contained within the given bounding rectangle.
/// </summary>
public async Task ListFeatures(Rectangle request, Grpc.Core.IServerStreamWriter<Feature> responseStream, Grpc.Core.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 async Task<RouteSummary> RecordRoute(Grpc.Core.IAsyncStreamReader<Point> requestStream, Grpc.Core.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 async Task RouteChat(Grpc.Core.IAsyncStreamReader<RouteNote> requestStream, Grpc.Core.IServerStreamWriter<RouteNote> responseStream, Grpc.Core.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;
}
}
}
|
