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RetryableUpdateCommandOperation.cs
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RetryableUpdateCommandOperation.cs
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/* Copyright 2017-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.Linq;
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.Misc;
using MongoDB.Driver.Core.Operations.ElementNameValidators;
using MongoDB.Driver.Core.WireProtocol.Messages;
using MongoDB.Driver.Core.WireProtocol.Messages.Encoders;
namespace MongoDB.Driver.Core.Operations
{
/// <summary>
/// Represents an update command operation.
/// </summary>
public class RetryableUpdateCommandOperation : RetryableWriteCommandOperationBase
{
// private fields
private bool? _bypassDocumentValidation;
private readonly CollectionNamespace _collectionNamespace;
private BsonDocument _let;
private readonly BatchableSource<UpdateRequest> _updates;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="RetryableUpdateCommandOperation" /> class.
/// </summary>
/// <param name="collectionNamespace">The collection namespace.</param>
/// <param name="updates">The updates.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public RetryableUpdateCommandOperation(
CollectionNamespace collectionNamespace,
BatchableSource<UpdateRequest> updates,
MessageEncoderSettings messageEncoderSettings)
: base(Ensure.IsNotNull(collectionNamespace, nameof(collectionNamespace)).DatabaseNamespace, messageEncoderSettings)
{
_collectionNamespace = Ensure.IsNotNull(collectionNamespace, nameof(collectionNamespace));
_updates = Ensure.IsNotNull(updates, nameof(updates));
}
// public properties
/// <summary>
/// Gets or sets a value indicating whether to bypass document validation.
/// </summary>
/// <value>A value indicating whether to bypass document validation.</value>
public bool? BypassDocumentValidation
{
get { return _bypassDocumentValidation; }
set { _bypassDocumentValidation = value; }
}
/// <summary>
/// Gets the collection namespace.
/// </summary>
/// <value>
/// The collection namespace.
/// </value>
public CollectionNamespace CollectionNamespace
{
get { return _collectionNamespace; }
}
/// <summary>
/// Gets or sets the let document.
/// </summary>
/// <value>The let document.</value>
public BsonDocument Let
{
get { return _let; }
set { _let = value; }
}
/// <summary>
/// Gets the updates.
/// </summary>
/// <value>
/// The updates.
/// </value>
public BatchableSource<UpdateRequest> Updates
{
get { return _updates; }
}
// protected methods
/// <inheritdoc />
protected override BsonDocument CreateCommand(ICoreSessionHandle session, int attempt, long? transactionNumber)
{
if (WriteConcern != null && !WriteConcern.IsAcknowledged)
{
if (_updates.Items.Skip(_updates.Offset).Take(_updates.Count).Any(u => u.Hint != null))
{
throw new NotSupportedException("Hint is not supported for unacknowledged writes.");
}
}
var writeConcern = WriteConcernHelper.GetEffectiveWriteConcern(session, WriteConcern);
return new BsonDocument
{
{ "update", _collectionNamespace.CollectionName },
{ "ordered", IsOrdered },
{ "bypassDocumentValidation", () => _bypassDocumentValidation.Value, _bypassDocumentValidation.HasValue },
{ "comment", Comment, Comment != null },
{ "writeConcern", writeConcern, writeConcern != null },
{ "txnNumber", () => transactionNumber.Value, transactionNumber.HasValue },
{ "let", _let, _let != null }
};
}
/// <inheritdoc />
protected override IEnumerable<Type1CommandMessageSection> CreateCommandPayloads(IChannelHandle channel, int attempt)
{
BatchableSource<UpdateRequest> updates;
if (attempt == 1)
{
updates = _updates;
}
else
{
updates = new BatchableSource<UpdateRequest>(_updates.Items, _updates.Offset, _updates.ProcessedCount, canBeSplit: false);
}
var maxBatchCount = Math.Min(MaxBatchCount ?? int.MaxValue, channel.ConnectionDescription.MaxBatchCount);
var maxDocumentSize = channel.ConnectionDescription.MaxWireDocumentSize;
var payload = new Type1CommandMessageSection<UpdateRequest>("updates", _updates, UpdateRequestSerializer.Instance, NoOpElementNameValidator.Instance, maxBatchCount, maxDocumentSize);
return new Type1CommandMessageSection[] { payload };
}
// nested types
private class UpdateRequestSerializer : SealedClassSerializerBase<UpdateRequest>
{
public static readonly IBsonSerializer<UpdateRequest> Instance = new UpdateRequestSerializer();
protected override void SerializeValue(BsonSerializationContext context, BsonSerializationArgs args, UpdateRequest value)
{
var writer = context.Writer;
writer.WriteStartDocument();
writer.WriteName("q");
BsonDocumentSerializer.Instance.Serialize(context, value.Filter);
writer.WriteName("u");
SerializeUpdate(context, args, value);
if (value.IsMulti)
{
writer.WriteName("multi");
writer.WriteBoolean(value.IsMulti);
}
if (value.IsUpsert)
{
writer.WriteName("upsert");
writer.WriteBoolean(value.IsUpsert);
}
if (value.Collation != null)
{
writer.WriteName("collation");
BsonDocumentSerializer.Instance.Serialize(context, value.Collation.ToBsonDocument());
}
if (value.ArrayFilters != null)
{
writer.WriteName("arrayFilters");
writer.WriteStartArray();
foreach (var arrayFilter in value.ArrayFilters)
{
BsonDocumentSerializer.Instance.Serialize(context, arrayFilter);
}
writer.WriteEndArray();
}
if (value.Hint != null)
{
writer.WriteName("hint");
BsonValueSerializer.Instance.Serialize(context, value.Hint);
}
writer.WriteEndDocument();
}
// private methods
private void SerializeUpdate(BsonSerializationContext context, BsonSerializationArgs args, UpdateRequest request)
{
var writer = context.Writer;
writer.PushElementNameValidator(ElementNameValidatorFactory.ForUpdateType(request.UpdateType));
try
{
var position = writer.Position;
BsonValueSerializer.Instance.Serialize(context, request.Update);
if (request.UpdateType == UpdateType.Update && writer.Position == position + 8)
{
throw new BsonSerializationException("Update documents cannot be empty.");
}
}
finally
{
writer.PopElementNameValidator();
}
}
}
}
}