using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace SN_Server
{

    public class InterthreadMessageQueue<T>
    {
        System.Collections.Generic.Queue<T> _queue = new
        System.Collections.Generic.Queue<T>();

        /// <summary>
        /// Post a message to the queue.
        /// </summary>
        public void PostItem(T item)
        {
            lock (_queue)
            {
                _queue.Enqueue(item);
                if (_queue.Count == 1)
                    Monitor.Pulse(_queue);
            }
        }
        /// <summary>
        /// Retrieve a message from the queue.
        /// </summary>
        /// <param name="maxWait">Number of milliseconds to block ifnothing is available. -1 means "block indefinitely"</param>
        /// <returns>The next item in the queue, or default(T) if queue is empty</returns>
        public T GetItem(int maxWait)
        {
            lock (_queue)
            {
                if (_queue.Count == 0)
                {
                    if (maxWait == 0)
                        return default(T);
                    Monitor.Wait(_queue, maxWait);
                    if (_queue.Count == 0)
                        return default(T);
                }
                return _queue.Dequeue();
            }
        }

        public int Count
        {
            get
            {
                lock (_queue)
                {
                    return _queue.Count;
                }
            }
        }
    }
}