[17257] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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| 23 | using System.Threading;
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| 24 | using HEAL.Attic;
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| 25 | using HeuristicLab.Common;
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| 26 | using HeuristicLab.Core;
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| 27 |
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| 28 | namespace HeuristicLab.Parameters {
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| 29 | [Item("ContextParameter", "")]
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| 30 | [StorableType("b4f6a624-19b8-46aa-b89b-6bba2f2e2491")]
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| 31 | public abstract class ContextParameter : Parameter, IContextParameter, IStatefulItem {
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| 32 |
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| 33 | protected Lazy<ThreadLocal<IItem>> cachedActualValues;
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| 34 | protected virtual IItem CachedActualValue {
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| 35 | get { return cachedActualValues.Value.Value; }
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| 36 | set { cachedActualValues.Value.Value = value; }
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| 37 | }
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| 38 |
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| 39 | protected Lazy<ThreadLocal<IExecutionContext>> executionContexts;
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| 40 | public virtual IExecutionContext ExecutionContext {
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| 41 | get { return executionContexts.Value.Value; }
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| 42 | set {
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| 43 | if (value != executionContexts.Value.Value) {
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| 44 | executionContexts.Value.Value = value;
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| 45 | cachedActualValues.Value.Value = null;
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| 46 | }
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| 47 | }
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| 48 | }
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| 49 |
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| 50 | [StorableConstructor]
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| 51 | protected ContextParameter(StorableConstructorFlag _) : base(_) {
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| 52 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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| 53 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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| 54 | }
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| 55 | protected ContextParameter(ContextParameter original, Cloner cloner)
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| 56 | : base(original, cloner) {
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| 57 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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| 58 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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| 59 | }
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| 60 | protected ContextParameter() : this("Anonymous", string.Empty, typeof(IItem)) { }
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| 61 | protected ContextParameter(string name, Type dataType) : this(name, string.Empty, dataType) { }
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| 62 | protected ContextParameter(string name, string description, Type dataType)
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| 63 | : base(name, description, dataType) {
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| 64 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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| 65 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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| 66 | }
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| 67 |
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| 68 | protected override IItem GetActualValue() {
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| 69 | if (CachedActualValue != null) return CachedActualValue;
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| 70 | CachedActualValue = GetActualValueFromContext();
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| 71 | return CachedActualValue;
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| 72 | }
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| 73 |
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| 74 | protected abstract IItem GetActualValueFromContext();
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| 75 |
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| 76 | public virtual void InitializeState() {
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| 77 | }
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| 78 | public virtual void ClearState() {
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| 79 | if (cachedActualValues.IsValueCreated) {
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| 80 | cachedActualValues.Value.Dispose();
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| 81 | cachedActualValues = new Lazy<ThreadLocal<IItem>>(() => { return new ThreadLocal<IItem>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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| 82 | }
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| 83 | if (executionContexts.IsValueCreated) {
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| 84 | executionContexts.Value.Dispose();
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| 85 | executionContexts = new Lazy<ThreadLocal<IExecutionContext>>(() => { return new ThreadLocal<IExecutionContext>(); }, LazyThreadSafetyMode.ExecutionAndPublication);
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| 86 | }
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| 87 | }
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| 88 | }
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| 89 | }
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