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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System.Collections.Generic;
using System.Threading;
namespace OpenSim.Framework
{
public class BlockingQueue<T>
{
private readonly Queue<T> m_pqueue = new Queue<T>();
private readonly Queue<T> m_queue = new Queue<T>();
private readonly object m_queueSync = new object();
public void PriorityEnqueue(T value)
{
lock (m_queueSync)
{
m_pqueue.Enqueue(value);
Monitor.Pulse(m_queueSync);
}
}
public void Enqueue(T value)
{
lock (m_queueSync)
{
m_queue.Enqueue(value);
Monitor.Pulse(m_queueSync);
}
}
public T Dequeue()
{
lock (m_queueSync)
{
while (m_queue.Count < 1 && m_pqueue.Count < 1)
{
Monitor.Wait(m_queueSync);
}
if (m_pqueue.Count > 0)
return m_pqueue.Dequeue();
if (m_queue.Count > 0)
return m_queue.Dequeue();
return default(T);
}
}
public T Dequeue(int msTimeout)
{
lock (m_queueSync)
{
if (m_queue.Count < 1 && m_pqueue.Count < 1)
{
if(!Monitor.Wait(m_queueSync, msTimeout))
return default(T);
}
if (m_pqueue.Count > 0)
return m_pqueue.Dequeue();
if (m_queue.Count > 0)
return m_queue.Dequeue();
return default(T);
}
}
/// <summary>
/// Indicate whether this queue contains the given item.
/// </summary>
/// <remarks>
/// This method is not thread-safe. Do not rely on the result without consistent external locking.
/// </remarks>
public bool Contains(T item)
{
lock (m_queueSync)
{
if (m_queue.Count < 1 && m_pqueue.Count < 1)
return false;
if (m_pqueue.Contains(item))
return true;
return m_queue.Contains(item);
}
}
/// <summary>
/// Return a count of the number of requests on this queue.
/// </summary>
public int Count()
{
lock (m_queueSync)
return m_queue.Count + m_pqueue.Count;
}
/// <summary>
/// Return the array of items on this queue.
/// </summary>
/// <remarks>
/// This method is not thread-safe. Do not rely on the result without consistent external locking.
/// </remarks>
public T[] GetQueueArray()
{
lock (m_queueSync)
{
if (m_queue.Count < 1 && m_pqueue.Count < 1)
return new T[0];
return m_queue.ToArray();
}
}
public void Clear()
{
lock (m_queueSync)
{
m_pqueue.Clear();
m_queue.Clear();
Monitor.Pulse(m_queueSync);
}
}
}
}
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