wehub-resource-sync
87 lines
2.6 KiB
C#
87 lines
2.6 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections.Generic;
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namespace QuantConnect.Util
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{
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/// <summary>
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/// A never ending queue that will dequeue and reenqueue the same item
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/// </summary>
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public class CircularQueue<T>
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{
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private readonly T _head;
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private readonly Queue<T> _queue;
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/// <summary>
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/// Fired when we do a full circle
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/// </summary>
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public event EventHandler CircleCompleted;
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/// <summary>
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/// Initializes a new instance of the <see cref="CircularQueue{T}"/> class
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/// </summary>
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/// <param name="items">The items in the queue</param>
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public CircularQueue(params T[] items)
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: this((IEnumerable<T>)items)
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="CircularQueue{T}"/> class
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/// </summary>
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/// <param name="items">The items in the queue</param>
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public CircularQueue(IEnumerable<T> items)
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{
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_queue = new Queue<T>();
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var first = true;
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foreach (var item in items)
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{
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if (first)
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{
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first = false;
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_head = item;
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}
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_queue.Enqueue(item);
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}
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}
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/// <summary>
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/// Dequeues the next item
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/// </summary>
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/// <returns>The next item</returns>
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public T Dequeue()
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{
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var item = _queue.Dequeue();
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if (item.Equals(_head))
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{
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OnCircleCompleted();
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}
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_queue.Enqueue(item);
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return item;
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}
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/// <summary>
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/// Event invocator for the <see cref="CircleCompleted"/> evet
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/// </summary>
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protected virtual void OnCircleCompleted()
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{
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var handler = CircleCompleted;
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if (handler != null) handler(this, EventArgs.Empty);
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}
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}
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} |