// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
#nullable disable
 
namespace Microsoft.DotNet.Cli.Telemetry.PersistenceChannel;
 
/// <summary>
///     A light fixed size queue. If Enqueue is called and queue's limit has reached the last item will be removed.
///     This data structure is thread safe.
/// </summary>
internal class FixedSizeQueue<T>
{
    private readonly int _maxSize;
    private readonly Queue<T> _queue = new();
    private readonly object _queueLockObj = new();
 
    internal FixedSizeQueue(int maxSize)
    {
        _maxSize = maxSize;
    }
 
    internal void Enqueue(T item)
    {
        lock (_queueLockObj)
        {
            if (_queue.Count == _maxSize)
            {
                _queue.Dequeue();
            }
 
            _queue.Enqueue(item);
        }
    }
 
    internal bool Contains(T item)
    {
        lock (_queueLockObj)
        {
            return _queue.Contains(item);
        }
    }
}