#region License Information /* HeuristicLab * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL) * * This file is part of HeuristicLab. * * HeuristicLab is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * HeuristicLab is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with HeuristicLab. If not, see . */ #endregion using System; using System.Threading; using System.Threading.Tasks; using HeuristicLab.Common; using HeuristicLab.Persistence.Default.CompositeSerializers.Storable; namespace HeuristicLab.Optimization { [StorableClass] public abstract class BasicAlgorithm : Algorithm, IStorableContent { public string Filename { get; set; } [Storable] private ResultCollection results; public override ResultCollection Results { get { return results; } } private CancellationTokenSource cancellationTokenSource; protected CancellationTokenSource CancellationTokenSource { get { return cancellationTokenSource; } private set { cancellationTokenSource = value; } } [StorableConstructor] protected BasicAlgorithm(bool deserializing) : base(deserializing) { } protected BasicAlgorithm(BasicAlgorithm original, Cloner cloner) : base(original, cloner) { results = cloner.Clone(original.Results); } protected BasicAlgorithm() : base() { results = new ResultCollection(); } public override void Prepare() { if (Problem == null) return; base.Prepare(); results.Clear(); OnPrepared(); } public override void Start() { base.Start(); CancellationTokenSource = new CancellationTokenSource(); OnStarted(); Task task = Task.Factory.StartNew(Run, cancellationTokenSource.Token, cancellationTokenSource.Token); task.ContinueWith(t => { try { t.Wait(); } catch (AggregateException ex) { try { ex.Flatten().Handle(x => x is OperationCanceledException); } catch (AggregateException remaining) { if (remaining.InnerExceptions.Count == 1) OnExceptionOccurred(remaining.InnerExceptions[0]); else OnExceptionOccurred(remaining); } } CancellationTokenSource.Dispose(); CancellationTokenSource = null; OnStopped(); }); } public override void Pause() { throw new NotSupportedException("Pause is not supported in basic algorithms."); } public override void Stop() { // CancellationToken.ThrowIfCancellationRequested() must be called from within the Run method, otherwise stop does nothing // alternatively check the IsCancellationRequested property of the cancellation token base.Stop(); CancellationTokenSource.Cancel(); } private DateTime lastUpdateTime; private void Run(object state) { CancellationToken cancellationToken = (CancellationToken)state; lastUpdateTime = DateTime.UtcNow; System.Timers.Timer timer = new System.Timers.Timer(250); timer.AutoReset = true; timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed); timer.Start(); try { Run(cancellationToken); } finally { timer.Elapsed -= new System.Timers.ElapsedEventHandler(timer_Elapsed); timer.Stop(); ExecutionTime += DateTime.UtcNow - lastUpdateTime; } } protected abstract void Run(CancellationToken cancellationToken); #region Events private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) { System.Timers.Timer timer = (System.Timers.Timer)sender; timer.Enabled = false; DateTime now = DateTime.UtcNow; ExecutionTime += now - lastUpdateTime; lastUpdateTime = now; timer.Enabled = true; } #endregion } }