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yreynhout/FunWithBaskets.cs

Created June 8, 2018 11:09
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Revisions

  1. yreynhout created this gist Jun 8, 2018.
    86 changes: 86 additions & 0 deletions FunWithBaskets.cs
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,86 @@
    public class Basket : EventSource
    {
    private int Id;

    private List<Item> Items = new List<Item>();

    public Basket()
    {
    On<ItemAddedToBasket>(e => {
    var item = new Item(@event =>
    {
    switch(@event)
    {
    case ItemCountIncreased increased:
    increased.BasketId = Id;
    }
    Apply(@event);
    });
    item.Play(e);
    Items.Add(item);
    });

    On<ItemCountIncreased>(e => {
    var item = Items.Single(candidate => candidate.Id == e.ItemId);
    item.Play(e);
    })
    }

    public void AddItem(int item)
    {
    Apply(new ItemAddedToBasket {
    BasketId = Id,
    ItemId = item
    });
    }

    //behavior - v1
    public void IncreaseItemCount(int item)
    {
    var item = Items.Single(candidate => candidate.Id == e.ItemId);
    item.IncreaseCount();
    }
    //behavior - v2
    public Item FindItem(int item)
    {
    return Items.Single(candidate => candidate.Id == e.ItemId);
    }

    public class Item : Entity
    {
    public int Id { get; }

    private int Count;

    public Item(Action<object> applier)
    : base(applier)
    {
    On<ItemAddedToBasket>(e => Id = e.ItemId);
    On<ItemCountIncreased>(e => Count++);
    }

    public void IncreaseCount()
    {
    Apply(new ItemCountIncreased { ItemId = Id });
    }
    }
    }


    //Handle AddItemToBasket
    var basket = baskets.FindById(msg.Body.BasketId);
    basket.AddItem(msg.Body.ItemId);

    //Handle IncreaseItemCountInBasket
    var basket = baskets.FindById(msg.Body.BasketId);
    basket.IncreaseItemCount(msg.Body.ItemId);

    or

    var basket = baskets.FindById(msg.Body.BasketId);
    var item = basket.FindItem(msg.Body.ItemId);
    item.IncreaseCount();

    BaskCreated
    ItemAddedToBasket
    ItemCountIncreased