/// <summary>
/// Construct a new instance.
/// </summary>
/// <param name="phenomeEvaluationScheme">Phenome evaluation scheme.</param>
/// <param name="initialPoolSize">Initial pool size.</param>
public PhenomeEvaluatorStackPool(
IPhenomeEvaluationScheme <TPhenome> phenomeEvaluationScheme,
int initialPoolSize)
{
if (!phenomeEvaluationScheme.EvaluatorsHaveState)
{
throw new InvalidOperationException("A stateless evaluation scheme does not require an evaluator pool; just use a single evaluator instance concurrently.");
}
_phenomeEvaluationScheme = phenomeEvaluationScheme;
// Create the stack with the spare capacity; to avoid re-alloc overhead if we require additional capacity.
_evaluatorStack = new LightweightStack <IPhenomeEvaluator <TPhenome> >(initialPoolSize * 2);
// Pre-populate with evaluators.
for (int i = 0; i < initialPoolSize; i++)
{
_evaluatorStack.Push(phenomeEvaluationScheme.CreateEvaluator());
}
// Enable thread tracking only if the debugger is attached; it adds non-trivial overhead to Enter/Exit.
_spinLock = new SpinLock(Debugger.IsAttached);
}
