-
Notifications
You must be signed in to change notification settings - Fork 1.2k
/
MapReduceLegacyOperation.cs
127 lines (115 loc) · 5.15 KB
/
MapReduceLegacyOperation.cs
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
/* Copyright 2013-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using MongoDB.Bson;
using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Serializers;
using MongoDB.Driver.Core.Bindings;
using MongoDB.Driver.Core.Connections;
using MongoDB.Driver.Core.Misc;
using MongoDB.Driver.Core.WireProtocol.Messages.Encoders;
namespace MongoDB.Driver.Core.Operations
{
/// <summary>
/// Represents a map-reduce operation.
/// </summary>
[Obsolete("Use Aggregation pipeline instead.")]
public class MapReduceLegacyOperation : MapReduceOperationBase, IReadOperation<BsonDocument>
{
// fields
private ReadConcern _readConcern = ReadConcern.Default;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="MapReduceLegacyOperation"/> class.
/// </summary>
/// <param name="collectionNamespace">The collection namespace.</param>
/// <param name="mapFunction">The map function.</param>
/// <param name="reduceFunction">The reduce function.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public MapReduceLegacyOperation(CollectionNamespace collectionNamespace, BsonJavaScript mapFunction, BsonJavaScript reduceFunction, MessageEncoderSettings messageEncoderSettings)
: base(
collectionNamespace,
mapFunction,
reduceFunction,
messageEncoderSettings)
{
}
// properties
/// <summary>
/// Gets or sets the read concern.
/// </summary>
/// <value>
/// The read concern.
/// </value>
public ReadConcern ReadConcern
{
get { return _readConcern; }
set { _readConcern = Ensure.IsNotNull(value, nameof(value)); }
}
// methods
/// <inheritdoc/>
protected override BsonDocument CreateOutputOptions()
{
return new BsonDocument("inline", 1);
}
/// <inheritdoc/>
public BsonDocument Execute(IReadBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (var channelSource = binding.GetReadChannelSource(cancellationToken))
using (var channel = channelSource.GetChannel(cancellationToken))
using (var channelBinding = new ChannelReadBinding(channelSource.Server, channel, binding.ReadPreference, binding.Session.Fork()))
{
var operation = CreateOperation(channelBinding.Session, channel.ConnectionDescription);
return operation.Execute(channelBinding, cancellationToken);
}
}
/// <inheritdoc/>
public async Task<BsonDocument> ExecuteAsync(IReadBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (var channelSource = await binding.GetReadChannelSourceAsync(cancellationToken).ConfigureAwait(false))
using (var channel = await channelSource.GetChannelAsync(cancellationToken).ConfigureAwait(false))
using (var channelBinding = new ChannelReadBinding(channelSource.Server, channel, binding.ReadPreference, binding.Session.Fork()))
{
var operation = CreateOperation(channelBinding.Session, channel.ConnectionDescription);
return await operation.ExecuteAsync(channelBinding, cancellationToken).ConfigureAwait(false);
}
}
/// <inheritdoc/>
protected internal override BsonDocument CreateCommand(ICoreSessionHandle session, ConnectionDescription connectionDescription)
{
var command = base.CreateCommand(session, connectionDescription);
var readConcern = ReadConcernHelper.GetReadConcernForCommand(session, connectionDescription, _readConcern);
if (readConcern != null)
{
command.Add("readConcern", readConcern);
}
return command;
}
private ReadCommandOperation<BsonDocument> CreateOperation(ICoreSessionHandle session, ConnectionDescription connectionDescription)
{
var command = CreateCommand(session, connectionDescription);
var operation = new ReadCommandOperation<BsonDocument>(CollectionNamespace.DatabaseNamespace, command, BsonDocumentSerializer.Instance, MessageEncoderSettings)
{
RetryRequested = false
};
return operation;
}
}
}