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DropIndexOperation.cs
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DropIndexOperation.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.Threading;
using System.Threading.Tasks;
using MongoDB.Bson;
using MongoDB.Bson.Serialization.Serializers;
using MongoDB.Driver.Core.Bindings;
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 drop index operation.
/// </summary>
public class DropIndexOperation : IWriteOperation<BsonDocument>
{
// fields
private readonly CollectionNamespace _collectionNamespace;
private BsonValue _comment;
private readonly string _indexName;
private TimeSpan? _maxTime;
private readonly MessageEncoderSettings _messageEncoderSettings;
private WriteConcern _writeConcern;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="DropIndexOperation"/> class.
/// </summary>
/// <param name="collectionNamespace">The collection namespace.</param>
/// <param name="keys">The keys.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public DropIndexOperation(
CollectionNamespace collectionNamespace,
BsonDocument keys,
MessageEncoderSettings messageEncoderSettings)
: this(collectionNamespace, IndexNameHelper.GetIndexName(keys), messageEncoderSettings)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="DropIndexOperation"/> class.
/// </summary>
/// <param name="collectionNamespace">The collection namespace.</param>
/// <param name="indexName">The name of the index.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public DropIndexOperation(
CollectionNamespace collectionNamespace,
string indexName,
MessageEncoderSettings messageEncoderSettings)
{
_collectionNamespace = Ensure.IsNotNull(collectionNamespace, nameof(collectionNamespace));
_indexName = Ensure.IsNotNullOrEmpty(indexName, nameof(indexName));
_messageEncoderSettings = Ensure.IsNotNull(messageEncoderSettings, nameof(messageEncoderSettings));
}
// properties
/// <summary>
/// Gets the collection namespace.
/// </summary>
/// <value>
/// The collection namespace.
/// </value>
public CollectionNamespace CollectionNamespace
{
get { return _collectionNamespace; }
}
/// <summary>
/// Gets or sets the comment.
/// </summary>
/// <value>
/// The comment.
/// </value>
public BsonValue Comment
{
get { return _comment; }
set { _comment = value; }
}
/// <summary>
/// Gets the name of the index.
/// </summary>
/// <value>
/// The name of the index.
/// </value>
public string IndexName
{
get { return _indexName; }
}
/// <summary>
/// Gets the message encoder settings.
/// </summary>
/// <value>
/// The message encoder settings.
/// </value>
public MessageEncoderSettings MessageEncoderSettings
{
get { return _messageEncoderSettings; }
}
/// <summary>
/// Gets or sets the write concern.
/// </summary>
/// <value>
/// The write concern.
/// </value>
public WriteConcern WriteConcern
{
get { return _writeConcern; }
set { _writeConcern = value; }
}
/// <summary>
/// Gets or sets the maximum time.
/// </summary>
/// <value>The maximum time.</value>
public TimeSpan? MaxTime
{
get { return _maxTime; }
set { _maxTime = Ensure.IsNullOrInfiniteOrGreaterThanOrEqualToZero(value, nameof(value)); }
}
// methods
internal BsonDocument CreateCommand(ICoreSessionHandle session)
{
var writeConcern = WriteConcernHelper.GetEffectiveWriteConcern(session, _writeConcern);
return new BsonDocument
{
{ "dropIndexes", _collectionNamespace.CollectionName },
{ "index", _indexName },
{ "maxTimeMS", () => MaxTimeHelper.ToMaxTimeMS(_maxTime.Value), _maxTime.HasValue },
{ "writeConcern", writeConcern, writeConcern != null },
{ "comment", _comment, _comment != null }
};
}
private IDisposable BeginOperation() => EventContext.BeginOperation("dropIndexes");
private WriteCommandOperation<BsonDocument> CreateOperation(ICoreSessionHandle session)
{
var command = CreateCommand(session);
return new WriteCommandOperation<BsonDocument>(_collectionNamespace.DatabaseNamespace, command, BsonDocumentSerializer.Instance, _messageEncoderSettings);
}
/// <inheritdoc/>
public BsonDocument Execute(IWriteBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (BeginOperation())
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);
BsonDocument result;
try
{
result = operation.Execute(channelBinding, cancellationToken);
}
catch (MongoCommandException ex)
{
if (!ShouldIgnoreException(ex))
{
throw;
}
result = ex.Result;
}
return result;
}
}
/// <inheritdoc/>
public async Task<BsonDocument> ExecuteAsync(IWriteBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (BeginOperation())
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);
BsonDocument result;
try
{
result = await operation.ExecuteAsync(channelBinding, cancellationToken).ConfigureAwait(false);
}
catch (MongoCommandException ex)
{
if (!ShouldIgnoreException(ex))
{
throw;
}
result = ex.Result;
}
return result;
}
}
private bool ShouldIgnoreException(MongoCommandException ex)
{
return
ex.Code == (int)ServerErrorCode.NamespaceNotFound ||
ex.ErrorMessage != null && ex.ErrorMessage.Contains("ns not found");
}
}
}