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FindAndModifyOperationBase.cs
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FindAndModifyOperationBase.cs
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/* 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.Text;
using System.Threading;
using System.Threading.Tasks;
using MongoDB.Bson;
using MongoDB.Bson.IO;
using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Serializers;
using MongoDB.Driver.Core.Bindings;
using MongoDB.Driver.Core.Connections;
using MongoDB.Driver.Core.Events;
using MongoDB.Driver.Core.Misc;
using MongoDB.Driver.Core.WireProtocol.Messages.Encoders;
namespace MongoDB.Driver.Core.Operations
{
/// <summary>
/// Represents a base class for find and modify operations.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
public abstract class FindAndModifyOperationBase<TResult> : IWriteOperation<TResult>, IRetryableWriteOperation<TResult>
{
// fields
private Collation _collation;
private BsonValue _comment;
private readonly CollectionNamespace _collectionNamespace;
private readonly MessageEncoderSettings _messageEncoderSettings;
private readonly IBsonSerializer<TResult> _resultSerializer;
private WriteConcern _writeConcern;
private bool _retryRequested;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="FindAndModifyOperationBase{TResult}"/> class.
/// </summary>
/// <param name="collectionNamespace">The collection namespace.</param>
/// <param name="resultSerializer">The result serializer.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public FindAndModifyOperationBase(CollectionNamespace collectionNamespace, IBsonSerializer<TResult> resultSerializer, MessageEncoderSettings messageEncoderSettings)
{
_collectionNamespace = Ensure.IsNotNull(collectionNamespace, nameof(collectionNamespace));
_resultSerializer = Ensure.IsNotNull(resultSerializer, nameof(resultSerializer));
_messageEncoderSettings = Ensure.IsNotNull(messageEncoderSettings, nameof(messageEncoderSettings));
}
// properties
/// <summary>
/// Gets or sets the collation.
/// </summary>
/// <value>
/// The collation.
/// </value>
public Collation Collation
{
get { return _collation; }
set { _collation = value; }
}
/// <summary>
/// Gets or sets the comment.
/// </summary>
/// <value>
/// The comment.
/// </value>
public BsonValue Comment
{
get { return _comment; }
set { _comment = value; }
}
/// <summary>
/// Gets the collection namespace.
/// </summary>
/// <value>
/// The collection namespace.
/// </value>
public CollectionNamespace CollectionNamespace
{
get { return _collectionNamespace; }
}
/// <summary>
/// Gets the message encoder settings.
/// </summary>
/// <value>
/// The message encoder settings.
/// </value>
public MessageEncoderSettings MessageEncoderSettings
{
get { return _messageEncoderSettings; }
}
/// <summary>
/// Gets the result serializer.
/// </summary>
/// <value>
/// The result serializer.
/// </value>
public IBsonSerializer<TResult> ResultSerializer
{
get { return _resultSerializer; }
}
/// <summary>
/// Gets or sets the write concern.
/// </summary>
public WriteConcern WriteConcern
{
get { return _writeConcern; }
set { _writeConcern = value; }
}
/// <summary>
/// Gets or sets whether the operation can be retried.
/// </summary>
public bool RetryRequested
{
get { return _retryRequested; }
set { _retryRequested = value; }
}
// public methods
/// <inheritdoc/>
public TResult Execute(IWriteBinding binding, CancellationToken cancellationToken)
{
using (BeginOperation())
{
return RetryableWriteOperationExecutor.Execute(this, binding, _retryRequested, cancellationToken);
}
}
/// <inheritdoc/>
public TResult Execute(RetryableWriteContext context, CancellationToken cancellationToken)
{
using (BeginOperation())
{
return RetryableWriteOperationExecutor.Execute(this, context, cancellationToken);
}
}
/// <inheritdoc/>
public Task<TResult> ExecuteAsync(IWriteBinding binding, CancellationToken cancellationToken)
{
using (BeginOperation())
{
return RetryableWriteOperationExecutor.ExecuteAsync(this, binding, _retryRequested, cancellationToken);
}
}
/// <inheritdoc/>
public Task<TResult> ExecuteAsync(RetryableWriteContext context, CancellationToken cancellationToken)
{
using (BeginOperation())
{
return RetryableWriteOperationExecutor.ExecuteAsync(this, context, cancellationToken);
}
}
/// <inheritdoc/>
public TResult ExecuteAttempt(RetryableWriteContext context, int attempt, long? transactionNumber, CancellationToken cancellationToken)
{
var binding = context.Binding;
var channelSource = context.ChannelSource;
var channel = context.Channel;
using (var channelBinding = new ChannelReadWriteBinding(channelSource.Server, channel, binding.Session.Fork()))
{
var operation = CreateOperation(channelBinding.Session, channel.ConnectionDescription, transactionNumber);
using (var rawBsonDocument = operation.Execute(channelBinding, cancellationToken))
{
return ProcessCommandResult(channel.ConnectionDescription.ConnectionId, rawBsonDocument);
}
}
}
/// <inheritdoc/>
public async Task<TResult> ExecuteAttemptAsync(RetryableWriteContext context, int attempt, long? transactionNumber, CancellationToken cancellationToken)
{
var binding = context.Binding;
var channelSource = context.ChannelSource;
var channel = context.Channel;
using (var channelBinding = new ChannelReadWriteBinding(channelSource.Server, channel, binding.Session.Fork()))
{
var operation = CreateOperation(channelBinding.Session, channel.ConnectionDescription, transactionNumber);
using (var rawBsonDocument = await operation.ExecuteAsync(channelBinding, cancellationToken).ConfigureAwait(false))
{
return ProcessCommandResult(channel.ConnectionDescription.ConnectionId, rawBsonDocument);
}
}
}
// private methods
private IDisposable BeginOperation() => EventContext.BeginOperation("findAndModify");
internal abstract BsonDocument CreateCommand(ICoreSessionHandle session, ConnectionDescription connectionDescription, long? transactionNumber);
private WriteCommandOperation<RawBsonDocument> CreateOperation(ICoreSessionHandle session, ConnectionDescription connectionDescription, long? transactionNumber)
{
var command = CreateCommand(session, connectionDescription, transactionNumber);
return new WriteCommandOperation<RawBsonDocument>(_collectionNamespace.DatabaseNamespace, command, RawBsonDocumentSerializer.Instance, _messageEncoderSettings)
{
CommandValidator = GetCommandValidator()
};
}
/// <summary>
/// Gets the command validator.
/// </summary>
/// <returns>An element name validator for the command.</returns>
protected abstract IElementNameValidator GetCommandValidator();
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2202:Do not dispose objects multiple times")]
private TResult ProcessCommandResult(ConnectionId connectionId, RawBsonDocument rawBsonDocument)
{
var binaryReaderSettings = new BsonBinaryReaderSettings
{
Encoding = _messageEncoderSettings.GetOrDefault<UTF8Encoding>(MessageEncoderSettingsName.ReadEncoding, Utf8Encodings.Strict)
};
#pragma warning disable 618
if (BsonDefaults.GuidRepresentationMode == GuidRepresentationMode.V2)
{
binaryReaderSettings.GuidRepresentation = _messageEncoderSettings.GetOrDefault<GuidRepresentation>(MessageEncoderSettingsName.GuidRepresentation, GuidRepresentation.CSharpLegacy);
}
#pragma warning restore 618
using (var stream = new ByteBufferStream(rawBsonDocument.Slice, ownsBuffer: false))
using (var reader = new BsonBinaryReader(stream, binaryReaderSettings))
{
var context = BsonDeserializationContext.CreateRoot(reader);
return _resultSerializer.Deserialize(context);
}
}
}
}