53 lines
1.5 KiB
C#
53 lines
1.5 KiB
C#
namespace Cryville.Common.Buffers {
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/// <summary>
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/// A resource pool that allows reusing instances of type <typeparamref name="T" />.
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/// </summary>
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/// <typeparam name="T">The type of the objects in the pool.</typeparam>
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public abstract class ObjectPool<T> where T : class {
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int _index;
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readonly T[] _objs;
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/// <summary>
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/// Creates an instance of the <see cref="ObjectPool{T}" /> class.
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/// </summary>
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/// <param name="capacity">The capacity of the pool.</param>
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public ObjectPool(int capacity) {
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_objs = new T[capacity];
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}
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/// <summary>
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/// The count of objects rented from the pool.
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/// </summary>
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public int RentedCount { get { return _index; } }
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/// <summary>
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/// Rents a object from the pool.
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/// </summary>
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/// <returns>The rented object.</returns>
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public T Rent() {
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T obj = null;
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if (_index < _objs.Length) {
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obj = _objs[_index];
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_objs[_index++] = null;
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}
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if (obj == null) obj = Construct();
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else Reset(obj);
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return obj;
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}
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/// <summary>
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/// Returns a rented object to the pool.
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/// </summary>
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/// <param name="obj">The object to return.</param>
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public void Return(T obj) {
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if (_index > 0) _objs[--_index] = obj;
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}
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/// <summary>
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/// Constructs a new instance of type <typeparamref name="T" />.
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/// </summary>
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/// <returns>The new instance.</returns>
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protected abstract T Construct();
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/// <summary>
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/// Resets an object.
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/// </summary>
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/// <param name="obj">The object.</param>
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protected virtual void Reset(T obj) { }
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}
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}
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