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EstimatedDocumentCountOperation.cs
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EstimatedDocumentCountOperation.cs
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/* Copyright 2021-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 an estimated document count operation.
/// </summary>
public class EstimatedDocumentCountOperation : IReadOperation<long>
{
// private fields
private readonly CollectionNamespace _collectionNamespace;
private BsonValue _comment;
private TimeSpan? _maxTime;
private readonly MessageEncoderSettings _messageEncoderSettings;
private ReadConcern _readConcern = ReadConcern.Default;
private bool _retryRequested;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="EstimatedDocumentCountOperation"/> class.
/// </summary>
/// <param name="collectionNamespace">The collection namespace.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public EstimatedDocumentCountOperation(CollectionNamespace collectionNamespace, MessageEncoderSettings messageEncoderSettings)
{
_collectionNamespace = Ensure.IsNotNull(collectionNamespace, nameof(collectionNamespace));
_messageEncoderSettings = Ensure.IsNotNull(messageEncoderSettings, nameof(messageEncoderSettings));
}
// public properties
/// <summary>
/// Gets the collection namespace.
/// </summary>
public CollectionNamespace CollectionNamespace => _collectionNamespace;
/// <summary>
/// Gets or sets the comment.
/// </summary>
public BsonValue Comment
{
get => _comment;
set => _comment = value;
}
/// <summary>
/// Gets or sets the maximum time the server should spend on this operation.
/// </summary>
public TimeSpan? MaxTime
{
get => _maxTime;
set => _maxTime = Ensure.IsNullOrInfiniteOrGreaterThanOrEqualToZero(value, nameof(value));
}
/// <summary>
/// Gets the message encoder settings.
/// </summary>
public MessageEncoderSettings MessageEncoderSettings => _messageEncoderSettings;
/// <summary>
/// Gets or sets the read concern.
/// </summary>
public ReadConcern ReadConcern
{
get => _readConcern;
set => _readConcern = Ensure.IsNotNull(value, nameof(value));
}
/// <summary>
/// Gets or sets a value indicating whether to retry.
/// </summary>
public bool RetryRequested
{
get => _retryRequested;
set => _retryRequested = value;
}
/// <inheritdoc/>
public long Execute(IReadBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (BeginOperation())
using (var context = RetryableReadContext.Create(binding, _retryRequested, cancellationToken))
{
var operation = CreateCountOperation();
return operation.Execute(context, cancellationToken);
}
}
/// <inheritdoc/>
public async Task<long> ExecuteAsync(IReadBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
using (BeginOperation())
using (var context = RetryableReadContext.Create(binding, _retryRequested, cancellationToken))
{
var operation = CreateCountOperation();
return await operation.ExecuteAsync(context, cancellationToken).ConfigureAwait(false);
}
}
// private methods
private IDisposable BeginOperation() => EventContext.BeginOperation("count");
private IExecutableInRetryableReadContext<long> CreateCountOperation()
{
var countOperation = new CountOperation(_collectionNamespace, _messageEncoderSettings)
{
Comment = _comment,
MaxTime = _maxTime,
ReadConcern = _readConcern,
RetryRequested = _retryRequested
};
return countOperation;
}
}
}