annotate Implab/ObjectPool.cs @ 135:656815cb7147 v2

Fixed chaining of promises with 'Then' method
author cin
date Fri, 13 Feb 2015 02:08:01 +0300
parents 2573b562e328
children
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1 using Implab.Parallels;
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2 using System;
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3 using System.Threading;
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4
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5 namespace Implab {
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6 /// <summary>
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7 /// Базовый класс для создания пулов объектов.
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8 /// </summary>
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9 /// <remarks>
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10 /// <para>Пул объектов позволяет многократно использовать один и тотже объект,
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11 /// что актуально для объектов, создание которых требует существенных ресурсов.
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12 /// Пул объектов использует слабые ссылки, чтобы не препятствовать освобождению
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13 /// ресурсов и создает новые объекты при необходимости.</para>
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14 /// <para>
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15 /// Наследники должны реализовывать метод <see cref="CreateInstance()"/> для создания
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16 /// новых экземпляров.
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17 /// </para>
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18 /// <para>Пул поддерживает обращения сразу из нескольких потоков.</para>
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19 /// </remarks>
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20 public abstract class ObjectPool<T> where T : class {
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2573b562e328 Promises rewritten, added improved version of AsyncQueue
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21 readonly AsyncQueue<WeakReference> m_queue = new AsyncQueue<WeakReference>();
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22 readonly int m_size;
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23 int m_count = 0;
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24
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25 protected ObjectPool() : this(Environment.ProcessorCount+1) {
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26
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27 }
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28
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29 protected ObjectPool(int size) {
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30 Safe.ArgumentInRange(size,1,size,"size");
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31
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32 m_size = size;
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33 }
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34
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35 protected abstract T CreateInstance();
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36
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37 protected virtual void CleanupInstance(T instance) {
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38 }
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39
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40 public T Allocate() {
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41 WeakReference reference;
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42 while (m_queue.TryDequeue(out reference)) {
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43 Interlocked.Decrement(ref m_count);
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44 object instance = reference.Target;
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45 if (instance == null)
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46 continue;
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47 return (T)instance;
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48 }
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49 return CreateInstance();
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50 }
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51
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52 public void Release(T instance) {
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53 if (m_count < m_size && instance != null) {
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54 Interlocked.Increment(ref m_count);
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55 CleanupInstance(instance);
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56 m_queue.Enqueue(new WeakReference(instance));
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57 }
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58 }
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59 }
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60 }