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RandomServerSelector.cs
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RandomServerSelector.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.Collections.Generic;
using System.Linq;
using MongoDB.Driver.Core.Misc;
using MongoDB.Driver.Core.Servers;
namespace MongoDB.Driver.Core.Clusters.ServerSelectors
{
/// <summary>
/// Represents a selector that selects a random server.
/// </summary>
public class RandomServerSelector : IServerSelector
{
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="RandomServerSelector"/> class.
/// </summary>
public RandomServerSelector()
{
}
// methods
/// <inheritdoc/>
public IEnumerable<ServerDescription> SelectServers(ClusterDescription cluster, IEnumerable<ServerDescription> servers)
{
var list = servers.ToList();
switch (list.Count)
{
case 0:
case 1:
return list;
default:
var index = ThreadStaticRandom.Next(list.Count);
return new[] { list[index] };
}
}
/// <inheritdoc/>
public override string ToString()
{
return "RandomServerSelector";
}
}
}