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EvalOperation.cs
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EvalOperation.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.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using MongoDB.Bson;
using MongoDB.Bson.Serialization.Serializers;
using MongoDB.Driver.Core.Bindings;
using MongoDB.Driver.Core.Misc;
using MongoDB.Driver.Core.WireProtocol.Messages.Encoders;
using MongoDB.Shared;
namespace MongoDB.Driver.Core.Operations
{
/// <summary>
/// Represents an eval operation.
/// </summary>
public class EvalOperation : IWriteOperation<BsonValue>
{
// fields
private IEnumerable<BsonValue> _args;
private readonly DatabaseNamespace _databaseNamespace;
private readonly BsonJavaScript _function;
private TimeSpan? _maxTime;
private readonly MessageEncoderSettings _messageEncoderSettings;
private bool? _noLock;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="EvalOperation"/> class.
/// </summary>
/// <param name="databaseNamespace">The database namespace.</param>
/// <param name="function">The JavaScript function.</param>
/// <param name="messageEncoderSettings">The message encoder settings.</param>
public EvalOperation(
DatabaseNamespace databaseNamespace,
BsonJavaScript function,
MessageEncoderSettings messageEncoderSettings)
{
_databaseNamespace = Ensure.IsNotNull(databaseNamespace, nameof(databaseNamespace));
_function = Ensure.IsNotNull(function, nameof(function));
_messageEncoderSettings = messageEncoderSettings;
}
// properties
/// <summary>
/// Gets or sets the arguments to the JavaScript function.
/// </summary>
/// <value>
/// The arguments to the JavaScript function.
/// </value>
public IEnumerable<BsonValue> Args
{
get { return _args; }
set { _args = value; }
}
/// <summary>
/// Gets the database namespace.
/// </summary>
/// <value>
/// The database namespace.
/// </value>
public DatabaseNamespace DatabaseNamespace
{
get { return _databaseNamespace; }
}
/// <summary>
/// Gets the JavaScript function.
/// </summary>
/// <value>
/// The JavaScript function.
/// </value>
public BsonJavaScript Function
{
get { return _function; }
}
/// <summary>
/// Gets or sets the maximum time the server should spend on this operation.
/// </summary>
/// <value>
/// The maximum time the server should spend on this operation.
/// </value>
public TimeSpan? MaxTime
{
get { return _maxTime; }
set { _maxTime = Ensure.IsNullOrInfiniteOrGreaterThanOrEqualToZero(value, nameof(value)); }
}
/// <summary>
/// Gets the message encoder settings.
/// </summary>
/// <value>
/// The message encoder settings.
/// </value>
public MessageEncoderSettings MessageEncoderSettings
{
get { return _messageEncoderSettings; }
}
/// <summary>
/// Gets or sets a value indicating whether the server should not take a global write lock before evaluating the JavaScript function.
/// </summary>
/// <value>
/// A value indicating whether the server should not take a global write lock before evaluating the JavaScript function.
/// </value>
public bool? NoLock
{
get { return _noLock; }
set { _noLock = value; }
}
// public methods
/// <inheritdoc/>
public BsonValue Execute(IWriteBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
var operation = CreateOperation();
var result = operation.Execute(binding, cancellationToken);
return result["retval"];
}
/// <inheritdoc/>
public async Task<BsonValue> ExecuteAsync(IWriteBinding binding, CancellationToken cancellationToken)
{
Ensure.IsNotNull(binding, nameof(binding));
var operation = CreateOperation();
var result = await operation.ExecuteAsync(binding, cancellationToken).ConfigureAwait(false);
return result["retval"];
}
// private methods
internal BsonDocument CreateCommand()
{
return new BsonDocument
{
{ "$eval", _function },
{ "args", () => new BsonArray(_args), _args != null },
{ "nolock", () => _noLock.Value, _noLock.HasValue },
{ "maxTimeMS", () => MaxTimeHelper.ToMaxTimeMS(_maxTime.Value), _maxTime.HasValue }
};
}
private WriteCommandOperation<BsonDocument> CreateOperation()
{
var command = CreateCommand();
return new WriteCommandOperation<BsonDocument>(_databaseNamespace, command, BsonDocumentSerializer.Instance, _messageEncoderSettings);
}
}
}