UpdateQueue.cs

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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Security.Permissions;
using OpenMetaverse;
using OpenSim.Region.Framework.Scenes;

namespace OpenSim.Region.Framework.Scenes.Types
{
    public class UpdateQueue
    {
        private Queue<SceneObjectPart> m_queue;

        private Dictionary<UUID, bool> m_ids;

        private object m_syncObject = new object();

        public int Count
        {
            get { return m_queue.Count; }
        }

        public UpdateQueue()
        {
            m_queue = new Queue<SceneObjectPart>();
            m_ids = new Dictionary<UUID, bool>();
        }

        public void Clear()
        {
            lock (m_syncObject)
            {
                m_ids.Clear();
                m_queue.Clear();
            }
        }

        public void Enqueue(SceneObjectPart part)
        {
            lock (m_syncObject)
            {
                if (!m_ids.ContainsKey(part.UUID)) {
                    m_ids.Add(part.UUID, true);
                    m_queue.Enqueue(part);
                }
            }
        }

        public SceneObjectPart Dequeue()
        {
            SceneObjectPart part = null;
            lock (m_syncObject)
            {
                if (m_queue.Count > 0)
                {
                    part = m_queue.Dequeue();
                    m_ids.Remove(part.UUID);
                }
            }

            return part;
        }
    }
}