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using System.Collections.Generic;
namespace Spv.Generator
{
public class GeneratorPool<T> where T : class, new()
{
private readonly List<T[]> _pool;
private int _chunkIndex = -1;
private int _poolIndex = -1;
private readonly int _poolSizeIncrement;
public GeneratorPool() : this(1000, 200) { }
public GeneratorPool(int chunkSizeLimit, int poolSizeIncrement)
{
_poolSizeIncrement = poolSizeIncrement;
_pool = new(chunkSizeLimit * 2);
AddChunkIfNeeded();
}
public T Allocate()
{
if (++_poolIndex >= _poolSizeIncrement)
{
AddChunkIfNeeded();
_poolIndex = 0;
}
return _pool[_chunkIndex][_poolIndex];
}
private void AddChunkIfNeeded()
{
if (++_chunkIndex >= _pool.Count)
{
T[] pool = new T[_poolSizeIncrement];
for (int i = 0; i < _poolSizeIncrement; i++)
{
pool[i] = new T();
}
_pool.Add(pool);
}
}
public void Clear()
{
_chunkIndex = 0;
_poolIndex = -1;
}
}
}
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