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
|
#region Copyright notice and license
// 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.
#endregion
using System;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using Grpc.Core.Internal;
using Grpc.Core.Utils;
namespace Grpc.Core.Internal
{
/// <summary>
/// Handles server side native call lifecycle.
/// </summary>
internal class AsyncCallServer<TRequest, TResponse> : AsyncCallBase<TResponse, TRequest>
{
readonly CompletionCallbackDelegate finishedServersideHandler;
readonly TaskCompletionSource<object> finishedServersideTcs = new TaskCompletionSource<object>();
public AsyncCallServer(Func<TResponse, byte[]> serializer, Func<byte[], TRequest> deserializer) : base(serializer, deserializer)
{
this.finishedServersideHandler = CreateBatchCompletionCallback(HandleFinishedServerside);
}
public void Initialize(CallSafeHandle call)
{
InitializeInternal(call);
}
/// <summary>
/// Starts a server side call. Currently, all server side calls are implemented as duplex
/// streaming call and they are adapted to the appropriate streaming arity.
/// </summary>
public Task ServerSideCallAsync(IObserver<TRequest> readObserver)
{
lock (myLock)
{
Preconditions.CheckNotNull(call);
started = true;
this.readObserver = readObserver;
call.StartServerSide(finishedServersideHandler);
StartReceiveMessage();
return finishedServersideTcs.Task;
}
}
/// <summary>
/// Sends a streaming response. Only one pending send action is allowed at any given time.
/// completionDelegate is called when the operation finishes.
/// </summary>
public void StartSendMessage(TResponse msg, AsyncCompletionDelegate completionDelegate)
{
StartSendMessageInternal(msg, completionDelegate);
}
/// <summary>
/// Sends call result status, also indicating server is done with streaming responses.
/// Only one pending send action is allowed at any given time.
/// completionDelegate is called when the operation finishes.
/// </summary>
public void StartSendStatusFromServer(Status status, AsyncCompletionDelegate completionDelegate)
{
lock (myLock)
{
Preconditions.CheckNotNull(completionDelegate, "Completion delegate cannot be null");
CheckSendingAllowed();
call.StartSendStatusFromServer(status, halfclosedHandler);
halfcloseRequested = true;
sendCompletionDelegate = completionDelegate;
}
}
/// <summary>
/// Handles the server side close completion.
/// </summary>
private void HandleFinishedServerside(bool wasError, BatchContextSafeHandleNotOwned ctx)
{
lock (myLock)
{
finished = true;
ReleaseResourcesIfPossible();
}
// TODO: handle error ...
finishedServersideTcs.SetResult(null);
}
}
}
|
