//******************************************************************************************************//  DynamicCalculator.cs - Gbtc////  Copyright © 2012, 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://  ----------------------------------------------------------------------------------------------------//  02/06/2012 - Stephen C. Wills//       Generated original version of source code.////****************************************************************************************************** using System;using System.Threading; namespace GSF.Threading{    /// <summary>    /// Represents a short-running synchronized operation that cannot run while it is already    /// in progress. Async operations will execute on the thread-pool after the specified    /// <see cref="Delay"/> in milliseconds.    /// </summary>    /// <remarks>    /// The action performed by the <see cref="DelayedSynchronizedOperation"/> is executed on    /// the <see cref="ThreadPool"/> when running the operation asynchronously. When the    /// operation is set to pending, the action is executed in an asynchronous loop on the    /// thread pool until all pending operations have been completed. Since the action is    /// executed on the thread pool, it is best if it can be executed quickly, without    /// blocking the thread or putting it to sleep. If completion of the operation is    /// critical, such as when saving data to a file, this type of operation should not    /// be used since thread pool threads are background threads and will not prevent the    /// program from ending before the operation is complete.    /// </remarks>    public class DelayedSynchronizedOperation : SynchronizedOperationBase    {        #region [ Members ]         // Constants         /// <summary>        /// Defines the default value for the <see cref="Delay"/> property.        /// </summary>        public const int DefaultDelay = 1000;         // Fields        private readonly Action m_delayedAction;         #endregion         #region [ Constructors ]         /// <summary>        /// Creates a new instance of the <see cref="DelayedSynchronizedOperation"/> class.        /// </summary>        /// <param name="action">The action to be performed during this operation.</param>        public DelayedSynchronizedOperation(Action action)            : this(action, null)        {        }         /// <summary>        /// Creates a new instance of the <see cref="DelayedSynchronizedOperation"/> class.        /// </summary>        /// <param name="action">The action to be performed during this operation.</param>        /// <param name="exceptionAction">The action to be performed if an exception is thrown from the action.</param>        public DelayedSynchronizedOperation(Action action, Action<Exception> exceptionAction)            : base(action, exceptionAction)        {            m_delayedAction = () =>            {                if (ExecuteAction())                    ExecuteActionAsync();            };        }         #endregion         #region [ Properties ]         /// <summary>        /// Gets or sets the amount of time to wait before execution, in milliseconds,        /// for any asynchronous calls. Zero value will execute immediately.        /// </summary>        /// <remarks>        /// Non asynchronous calls will not be delayed.        /// </remarks>        public int Delay { get; set; } = DefaultDelay;         #endregion         #region [ Methods ]         /// <summary>        /// Executes the action on a separate thread after the specified <see cref="Delay"/>.        /// </summary>        protected override void ExecuteActionAsync()        {            m_delayedAction.DelayAndExecute(Delay);        }         #endregion    }}