//******************************************************************************************************//  WeakActionFast.cs - Gbtc////  Copyright © 2013, Grid Protection Alliance.  All Rights Reserved.////  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See//  the NOTICE file distributed with this work for additional information regarding copyright ownership.//  The GPA licenses this file to you under the MIT License (MIT), the "License"; you may//  not use this file except in compliance with the License. You may obtain a copy of the License at:////      http://www.opensource.org/licenses/MIT////  Unless agreed to in writing, the subject software distributed under the License is distributed on an//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the//  License for the specific language governing permissions and limitations.////  Code Modification History://  ----------------------------------------------------------------------------------------------------//  01/16/2013 - Steven E. Chisholm//       Generated original version of source code. ////****************************************************************************************************** using System;using System.Runtime.CompilerServices; namespace GSF.Threading{    /// <summary>    /// Provides a weak referenced action delegate.    /// </summary>    /// <remarks>    /// <para>    /// Unlike many implementations of a weak action, this class does not    /// use reflection so calls will be faster. However, a strong reference    /// *must* be maintained for the <see cref="Action"/> callback passed    /// to this class. This reference is returned through an out parameter    /// in the constructor.    /// </para>    /// <para>    /// Careful consideration must be made when deciding where to store    /// the strong reference as this strong reference will need to also    /// lose reference. A good place would be as a member variable of the    /// object of the target method.    /// </para>    /// </remarks>    [Serializable]    public class WeakAction : WeakReference    {        /// <summary>        /// Creates a high speed weak action.        /// </summary>        /// <param name="callback">The callback.</param>        /// <param name="localStrongReference">A strong reference that must be maintained in the class that is the target of the action.</param>        public WeakAction(Action callback, out object localStrongReference)            : base(callback)        {            localStrongReference = callback;        }         /// <summary>        /// Attempts to invoke the delegate to a weak reference object.        /// </summary>        /// <returns><c>true</c> if successful; otherwise, <c>false</c>.</returns>        [MethodImpl(MethodImplOptions.NoInlining)]        public bool TryInvoke()        {            Action target = Target as Action;             if ((object)target == null)                return false;             target();             return true;        }         /// <summary>        /// Clears <see cref="Action"/> callback target.        /// </summary>        public void Clear()        {            Target = null;        }    }     /// <summary>    /// Provides a weak referenced action delegate.    /// </summary>    /// <remarks>    /// <para>    /// Unlike many implementations of a weak action, this class does not    /// use reflection so calls will be faster. However, a strong reference    /// *must* be maintained for the <see cref="Action"/> callback passed    /// to this class. This reference is returned through an out parameter    /// in the constructor.    /// </para>    /// <para>    /// Careful consideration must be made when deciding where to store    /// the strong reference as this strong reference will need to also    /// lose reference. A good place would be as a member variable of the    /// object of the target method.    /// </para>    /// </remarks>    [Serializable]    public class WeakAction<T> : WeakReference    {        /// <summary>        /// Creates a high speed weak action         /// </summary>        /// <param name="callback">The callback.</param>        /// <param name="localStrongReference">A strong reference that must be maintained in the class that is the target of the action.</param>        public WeakAction(Action<T> callback, out object localStrongReference)            : base(callback)        {            localStrongReference = callback;        }         /// <summary>        /// Attempts to invoke the delegate to a weak reference object.        /// </summary>        /// <returns><c>true</c> if successful; otherwise, <c>false</c>.</returns>        [MethodImpl(MethodImplOptions.NoInlining)]        public bool TryInvoke(T args)        {            Action<T> target = Target as Action<T>;             if ((object)target == null)                return false;             target(args);             return true;        }         /// <summary>        /// Clears <see cref="Action"/> callback target.        /// </summary>        public void Clear()        {            Target = null;        }    }}