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[13069] | 1 | using System;
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| 2 | using System.Collections.Generic;
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| 3 |
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| 4 | namespace HeuristicLab.BioBoost.Evaluators {
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| 5 |
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| 6 | /// <summary>
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| 7 | /// Object pool for reusing frequently created and discarded objects.
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| 8 | /// </summary>
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| 9 | /// <typeparam name="T"></typeparam>
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| 10 | public class ObjectPool<T> where T : new() {
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| 11 |
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| 12 | private readonly Stack<T> pool;
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| 13 |
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| 14 | public int MaxPoolSize { get; set; }
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| 15 |
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| 16 | public Func<T> Create;
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| 17 | public Action<T> Clear;
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| 18 | public Func<T, int, bool> Accept;
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| 19 |
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| 20 | private static void DoNothing(T o) {}
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| 21 | private static bool DefaultAccept(T o, int count) { return count < 100; }
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| 22 |
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| 23 | public ObjectPool() : this(() => new T(), DoNothing, DefaultAccept) {}
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| 24 |
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| 25 | public ObjectPool(Func<T> create, Action<T> clear, Func<T, int, bool> accept) {
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| 26 | pool = new Stack<T>();
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| 27 | Create = create;
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| 28 | Clear = clear;
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| 29 | Accept = accept;
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| 30 | }
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| 31 |
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| 32 | public T Get() {
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| 33 | lock (this) {
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| 34 | if (pool.Count > 0) {
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| 35 | return pool.Pop();
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| 36 | }
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| 37 | }
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| 38 | return Create();
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| 39 | }
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| 40 |
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| 41 | public T GetCleared() {
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| 42 | lock (this) {
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| 43 | if (pool.Count > 0) {
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| 44 | var val = pool.Pop();
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| 45 | Clear(val);
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| 46 | return val;
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| 47 | }
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| 48 | }
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| 49 | return Create();
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| 50 | }
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| 51 |
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| 52 | public void Return(T o) {
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| 53 | lock (this) {
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| 54 | if (Accept(o, pool.Count))
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| 55 | pool.Push(o);
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| 56 | }
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| 57 | }
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| 58 |
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| 59 | public void Reset() {
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| 60 | lock (this)
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| 61 | pool.Clear();
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| 62 | }
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| 63 |
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| 64 | }
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| 65 | }
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