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CreateViewOperation.cs
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CreateViewOperation.cs
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/* Copyright 2016-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.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using MongoDB.Bson;
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 create view operation.
/// </summary>
public class CreateViewOperation : IWriteOperation<BsonDocument>
{
// private fields
private Collation _collation;
private readonly DatabaseNamespace _databaseNamespace;
private readonly MessageEncoderSettings _messageEncoderSettings;
private readonly IReadOnlyList<BsonDocument> _pipeline;
private readonly string _viewName;
private readonly string _viewOn;
private WriteConcern _writeConcern;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="CreateCollectionOperation" /> class.
/// </summary>
/// <param name="databaseNamespace">The name of the database.</param>
/// <param name="viewName">The name of the view.</param>
/// <param name="viewOn">The name of the collection that the view is on.</param>
/// <param name="pipeline">The pipeline.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public CreateViewOperation(
DatabaseNamespace databaseNamespace,
string viewName,
string viewOn,
IEnumerable<BsonDocument> pipeline,
MessageEncoderSettings messageEncoderSettings)
{
_databaseNamespace = Ensure.IsNotNull(databaseNamespace, nameof(databaseNamespace));
_viewName = Ensure.IsNotNull(viewName, nameof(viewName));
_viewOn = Ensure.IsNotNull(viewOn, nameof(viewOn));
_pipeline = Ensure.IsNotNull(pipeline, nameof(pipeline)).ToList();
_messageEncoderSettings = Ensure.IsNotNull(messageEncoderSettings, nameof(messageEncoderSettings));
}
// public properties
/// <summary>
/// Gets or sets the collation.
/// </summary>
/// <value>
/// The collation.
/// </value>
public Collation Collation
{
get { return _collation; }
set { _collation = value; }
}
/// <summary>
/// Gets the namespace of the database.
/// </summary>
/// <value>
/// The namespace of the database.
/// </value>
public DatabaseNamespace DatabaseNamespace
{
get { return _databaseNamespace; }
}
/// <summary>
/// Gets the message encoder settings.
/// </summary>
/// <value>
/// The message encoder settings.
/// </value>
public MessageEncoderSettings MessageEncoderSettings
{
get { return _messageEncoderSettings; }
}
/// <summary>
/// Gets the pipeline.
/// </summary>
/// <value>
/// The pipeline.
/// </value>
public IReadOnlyList<BsonDocument> Pipeline
{
get { return _pipeline; }
}
/// <summary>
/// Gets the name of the view.
/// </summary>
/// <value>
/// The name of the view.
/// </value>
public string ViewName
{
get { return _viewName; }
}
/// <summary>
/// Gets the name of the collection that the view is on.
/// </summary>
/// <value>
/// The name of the collection that the view is on.
/// </value>
public string ViewOn
{
get { return _viewOn; }
}
/// <summary>
/// Gets or sets the write concern.
/// </summary>
/// <value>
/// The write concern.
/// </value>
public WriteConcern WriteConcern
{
get { return _writeConcern; }
set { _writeConcern = value; }
}
// public methods
/// <inheritdoc/>
public BsonDocument Execute(IWriteBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (var channelSource = binding.GetWriteChannelSource(cancellationToken))
using (var channel = channelSource.GetChannel(cancellationToken))
using (var channelBinding = new ChannelReadWriteBinding(channelSource.Server, channel, binding.Session.Fork()))
{
var operation = CreateOperation(channelBinding.Session, channel.ConnectionDescription);
return operation.Execute(channelBinding, cancellationToken);
}
}
/// <inheritdoc/>
public async Task<BsonDocument> ExecuteAsync(IWriteBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (var channelSource = await binding.GetWriteChannelSourceAsync(cancellationToken).ConfigureAwait(false))
using (var channel = await channelSource.GetChannelAsync(cancellationToken).ConfigureAwait(false))
using (var channelBinding = new ChannelReadWriteBinding(channelSource.Server, channel, binding.Session.Fork()))
{
var operation = CreateOperation(channelBinding.Session, channel.ConnectionDescription);
return await operation.ExecuteAsync(channelBinding, cancellationToken).ConfigureAwait(false);
}
}
// private methods
internal BsonDocument CreateCommand(ICoreSessionHandle session, ConnectionDescription connectionDescription)
{
var writeConcern = WriteConcernHelper.GetEffectiveWriteConcern(session, _writeConcern);
return new BsonDocument
{
{ "create", _viewName },
{ "viewOn", _viewOn },
{ "pipeline", new BsonArray(_pipeline) },
{ "collation", () => _collation.ToBsonDocument(), _collation != null },
{ "writeConcern", writeConcern, writeConcern != null }
};
}
private WriteCommandOperation<BsonDocument> CreateOperation(ICoreSessionHandle session, ConnectionDescription connectionDescription)
{
var command = CreateCommand(session, connectionDescription);
return new WriteCommandOperation<BsonDocument>(_databaseNamespace, command, BsonDocumentSerializer.Instance, _messageEncoderSettings);
}
}
}