Promise aggregation

NovelActorPerformance.cs

using UnityCommon;

/// <summary>
/// Represents a set of async actions performed by a <see cref="INovelActor"/> over time.
/// </summary>
public class NovelActorPerformance : AsyncAction<INovelActor>
{
    public INovelActor Actor { get { return State; } }

    private int performancesCount;

    public NovelActorPerformance (INovelActor actor) : base(actor)
    {
        actor.OnPerformanceCompleted += HandlePerformanceCompleted;
    }

    public NovelActorPerformance (params NovelActorPerformance[] performances)
    {
        performancesCount = performances.Length;
        foreach (var performance in performances)
            performance.OnCompleted += HandlePerformanceCompleted;
    }

    public override void CompleteInstantly ()
    {
        if (IsCompleted) return;
        Actor.CompletePerformance(this);
    }

    public override void CompleteInstantly (INovelActor state)
    {
        CompleteInstantly();
    }

    private void HandlePerformanceCompleted (NovelActorPerformance performance)
    {
        if (performance != this) return;

        Actor.OnPerformanceCompleted -= HandlePerformanceCompleted;
        HandleOnCompleted();
    }

    private void HandlePerformanceCompleted (INovelActor actor)
    {
        performancesCount--;
        if (performancesCount == 0)
            HandleOnCompleted();
    }
}