Patterns/Singleton.cs

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/*
 * Author: Kishore Reddy
 * Url: http://commonlibrarynet.codeplex.com/
 * Title: CommonLibrary.NET
 * Copyright: � 2009 Kishore Reddy
 * License: LGPL License
 * LicenseUrl: http://commonlibrarynet.codeplex.com/license
 * Description: A C# based .NET 3.5 Open-Source collection of reusable components.
 * Usage: Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CommonLibrary
{
    /// <summary>
    /// Singleton implementation using generics.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class Singleton<T>
    {
        private static T _item;
        private static object _syncRoot = new object();
        private static Func<T> _creator;

        
        /// <summary>
        /// Prevent instantiation
        /// </summary>
        private Singleton() { }


        /// <summary>
        /// Initalize with the creator.
        /// </summary>
        /// <param name="creator"></param>
        public static void Init(Func<T> creator)
        {
            _creator = creator;
        }


        /// <summary>
        /// Initialize using instance.
        /// </summary>
        /// <param name="item"></param>
        public static void Init(T item)
        {
            _item = item;
            _creator = new Func<T>(() => item);
        }


        /// <summary>