/***************************************************************************
 *  CommandQueueManager.cs
 *
 *  Copyright (C) 2008 Michael C. Urbanski
 *  Written by Mike Urbanski <michael.c.urbanski@gmail.com>
 ****************************************************************************/

/*  THIS FILE IS LICENSED UNDER THE MIT LICENSE AS OUTLINED IMMEDIATELY BELOW:
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a
 *  copy of this software and associated documentation files (the "Software"),
 *  to deal in the Software without restriction, including without limitation
 *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
 *  and/or sell copies of the Software, and to permit persons to whom the
 *  Software is furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 *  DEALINGS IN THE SOFTWARE.
 */

using System;
using System.Collections;
using System.Collections.Generic;

namespace Migo.TaskCore
{
    public static class CommandQueueManager
    {
        private static readonly object sync;
        private static Dictionary<Guid,AsyncCommandQueue> queues;

        static CommandQueueManager ()
        {
            queues = new Dictionary<Guid,AsyncCommandQueue> ();
            sync = ((ICollection)queues).SyncRoot;
        }

        public static AsyncCommandQueue GetCommandQueue (Guid guid)
        {
            lock (sync) {
                if (queues.ContainsKey (guid)) {
                    return queues[guid];
                }
            }

            return null;
        }

        public static Guid Register (AsyncCommandQueue queue)
        {
            if (queue == null) {
                throw new ArgumentNullException ("queue");
            }

            Guid guid = Guid.NewGuid ();

            lock (sync) {
                queues.Add (guid, queue);
            }

            return guid;
        }
    }
}