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ListIndexesOperation.cs
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ListIndexesOperation.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.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 list indexes operation.
/// </summary>
public class ListIndexesOperation : IReadOperation<IAsyncCursor<BsonDocument>>
{
// fields
private int? _batchSize;
private readonly CollectionNamespace _collectionNamespace;
private BsonValue _comment;
private readonly MessageEncoderSettings _messageEncoderSettings;
private bool _retryRequested;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="ListIndexesOperation"/> class.
/// </summary>
/// <param name="collectionNamespace">The collection namespace.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public ListIndexesOperation(
CollectionNamespace collectionNamespace,
MessageEncoderSettings messageEncoderSettings)
{
_collectionNamespace = Ensure.IsNotNull(collectionNamespace, nameof(collectionNamespace));
_messageEncoderSettings = messageEncoderSettings;
}
// properties
/// <summary>
/// Gets or sets the batch size.
/// </summary>
/// <value>
/// The batch size.
/// </value>
public int? BatchSize
{
get => _batchSize;
set => _batchSize = value;
}
/// <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 message encoder settings.
/// </summary>
/// <value>
/// The message encoder settings.
/// </value>
public MessageEncoderSettings MessageEncoderSettings
{
get { return _messageEncoderSettings; }
}
/// <summary>
/// Gets or sets whether or not retry was requested.
/// </summary>
/// <value>
/// Whether retry was requested.
/// </value>
public bool RetryRequested
{
get => _retryRequested;
set => _retryRequested = value;
}
// public methods
/// <inheritdoc/>
public IAsyncCursor<BsonDocument> Execute(IReadBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (BeginOperation())
using (var context = RetryableReadContext.Create(binding, _retryRequested, cancellationToken))
{
var operation = CreateOperation(context.Channel);
return operation.Execute(context, cancellationToken);
}
}
/// <inheritdoc/>
public async Task<IAsyncCursor<BsonDocument>> ExecuteAsync(IReadBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (BeginOperation())
using (var context = await RetryableReadContext.CreateAsync(binding, _retryRequested, cancellationToken).ConfigureAwait(false))
{
var operation = CreateOperation(context.Channel);
return await operation.ExecuteAsync(context, cancellationToken).ConfigureAwait(false);
}
}
// private methods
private IDisposable BeginOperation() => EventContext.BeginOperation(null, "listIndexes");
private IExecutableInRetryableReadContext<IAsyncCursor<BsonDocument>> CreateOperation(IChannel channel)
{
return new ListIndexesUsingCommandOperation(_collectionNamespace, _messageEncoderSettings)
{
BatchSize = _batchSize,
Comment = _comment,
RetryRequested = _retryRequested // might be overridden by retryable read context
};
}
}
}