#region License Information /* HeuristicLab * Copyright (C) 2002-2015 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.Linq; using System.Reflection; using HeuristicLab.Common; using HeuristicLab.Core; using HeuristicLab.Optimization; using HeuristicLab.Persistence.Default.CompositeSerializers.Storable; using HeuristicLab.Scripting; namespace HeuristicLab.Problems.Programmable { [Item("ProblemDefinitionScript", "Script that defines the parameter vector and evaluates the solution for a programmable problem.")] [StorableType("775A2B59-29CB-43D6-B203-DE6338A4FEFA")] public abstract class ProblemDefinitionScript : Script, IProblemDefinition { protected bool SuppressEvents { get; set; } [Storable] private VariableStore variableStore; public VariableStore VariableStore { get { return variableStore; } } [Storable] private bool codeChanged; [StorableConstructor] protected ProblemDefinitionScript(bool deserializing) : base(deserializing) { } protected ProblemDefinitionScript(ProblemDefinitionScript original, Cloner cloner) : base(original, cloner) { variableStore = cloner.Clone(original.variableStore); codeChanged = original.codeChanged; } protected ProblemDefinitionScript() : base() { variableStore = new VariableStore(); } protected ProblemDefinitionScript(string code) : base(code) { variableStore = new VariableStore(); } IEncoding IProblemDefinition.Encoding { get { return CompiledProblemDefinition.Encoding; } } private readonly object compileLock = new object(); private volatile IProblemDefinition compiledProblemDefinition; protected IProblemDefinition CompiledProblemDefinition { get { // double checked locking pattern if (compiledProblemDefinition == null) { lock (compileLock) { if (compiledProblemDefinition == null) { if (codeChanged) throw new ProblemDefinitionScriptException("The code has been changed, but was not recompiled."); Compile(false); } } } return compiledProblemDefinition; } } public sealed override Assembly Compile() { return Compile(true); } private Assembly Compile(bool fireChanged) { var assembly = base.Compile(); var types = assembly.GetTypes(); if (!types.Any(x => typeof(CompiledProblemDefinition).IsAssignableFrom(x))) throw new ProblemDefinitionScriptException("The compiled code doesn't contain a problem definition." + Environment.NewLine + "The problem definition must be a subclass of CompiledProblemDefinition."); if (types.Count(x => typeof(CompiledProblemDefinition).IsAssignableFrom(x)) > 1) throw new ProblemDefinitionScriptException("The compiled code contains multiple problem definitions." + Environment.NewLine + "Only one subclass of CompiledProblemDefinition is allowed."); CompiledProblemDefinition inst; try { inst = (CompiledProblemDefinition)Activator.CreateInstance(types.Single(x => typeof(CompiledProblemDefinition).IsAssignableFrom(x))); } catch (Exception e) { compiledProblemDefinition = null; throw new ProblemDefinitionScriptException("Instantiating the problem definition failed." + Environment.NewLine + "Check your default constructor.", e); } try { inst.vars = new Variables(VariableStore); inst.Initialize(); } catch (Exception e) { compiledProblemDefinition = null; throw new ProblemDefinitionScriptException("Initializing the problem definition failed." + Environment.NewLine + "Check your Initialize() method.", e); } try { compiledProblemDefinition = inst; if (fireChanged) OnProblemDefinitionChanged(); } catch (Exception e) { compiledProblemDefinition = null; throw new ProblemDefinitionScriptException("Using the problem definition in the problem failed." + Environment.NewLine + "Examine this error message carefully (often there is an issue with the defined encoding).", e); } codeChanged = false; return assembly; } protected override void OnCodeChanged() { base.OnCodeChanged(); compiledProblemDefinition = null; codeChanged = true; } public event EventHandler ProblemDefinitionChanged; protected virtual void OnProblemDefinitionChanged() { var handler = ProblemDefinitionChanged; if (handler != null) handler(this, EventArgs.Empty); } } }