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using System;
using System.Collections.Generic;
using AggregateSource;
using NUnit.Framework;
namespace SampleSource
{
namespace UsingEntities
{
using Messaging;
[TestFixture]
public class SampleUsage
{
TodoList _list;
TodoListItemId _todoListItemId;
[SetUp]
public void SetUp()
{
_list = new TodoList(new TodoListId(Guid.NewGuid()), "Before my 40th birthday");
_todoListItemId = new TodoListItemId(Guid.NewGuid());
_list.AddNewItem(_todoListItemId, "Compose a piece of music");
_list.ClearChanges();
}
[Test]
public void Encapsulated_TodoListItem_Behavior_Changes_Are_Tracked()
{
_list.DescribeItem(_todoListItemId, "Compose a crappy piece of music");
Assert.That(_list.GetChanges(), Is.EquivalentTo(
new Object[]
{
new DescribedTodoListItem(_todoListItemId, "Compose a crappy piece of music")
}));
}
[Test]
public void Exposed_TodoListItem_Behavior_Changes_Are_Tracked()
{
_list.FindById(_todoListItemId).Describe("Compose a crappy piece of music");
Assert.That(_list.GetChanges(), Is.EquivalentTo(
new Object[]
{
new DescribedTodoListItem(_todoListItemId, "Compose a crappy piece of music")
}));
}
}
public class TodoList : AggregateRootEntity
{
TodoList()
{
Register<AddedNewTodoList>(When);
Register<AddedNewItemToTodoList>(When);
Register<DescribedTodoListItem>(When);
}
public TodoList(TodoListId id, string name)
: this()
{
Apply(new AddedNewTodoList(id, name));
}
public void AddNewItem(TodoListItemId itemId, string description)
{
Apply(new AddedNewItemToTodoList(Id, itemId, description));
}
public void DescribeItem(TodoListItemId itemId, string description)
{
Apply(new DescribedTodoListItem(itemId, description));
}
public TodoListItem FindById(TodoListItemId itemId)
{
return _items.Find(item => item.Id.Equals(itemId));
}
// state
public TodoListId Id { get; private set; }
List<TodoListItem> _items;
void When(AddedNewTodoList @event)
{
Id = new TodoListId(@event.Id);
_items = new List<TodoListItem>();
}
void When(AddedNewItemToTodoList @event)
{
var item = new TodoListItem(Apply);
item.Play(@event);
_items.Add(item);
}
void When(DescribedTodoListItem @event)
{
_items.Find(item => item.Id == @event.Id).Play(@event);
}
}
public class TodoListItem : Entity
{
public TodoListItem(Action<object> applier)
: base(applier)
{
Register<AddedNewItemToTodoList>(When);
Register<DescribedTodoListItem>(When);
}
public void Describe(string description)
{
Apply(new DescribedTodoListItem(Id, description));
}
public TodoListItemId Id { get; private set; }
void When(AddedNewItemToTodoList @event)
{
Id = new TodoListItemId(@event.TodoListItemId);
}
void When(DescribedTodoListItem @event)
{
/* just so you can see we really get to this point */
}
}
public struct TodoListItemId : IEquatable<TodoListItemId>
{
readonly Guid _value;
public TodoListItemId(Guid value)
{
_value = value;
}
public bool Equals(TodoListItemId other)
{
return _value.Equals(other._value);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
return obj is TodoListItemId && Equals((TodoListItemId) obj);
}
public override int GetHashCode()
{
return _value.GetHashCode();
}
public static implicit operator Guid(TodoListItemId id)
{
return id._value;
}
}
public struct TodoListId : IEquatable<TodoListId>
{
readonly Guid _value;
public TodoListId(Guid value)
{
_value = value;
}
public bool Equals(TodoListId other)
{
return _value.Equals(other._value);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
return obj is TodoListId && Equals((TodoListId) obj);
}
public override int GetHashCode()
{
return _value.GetHashCode();
}
public static implicit operator Guid(TodoListId id)
{
return id._value;
}
}
namespace Messaging
{
public class AddedNewTodoList
{
protected bool Equals(AddedNewTodoList other)
{
return Id.Equals(other.Id) && string.Equals(Name, other.Name);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != GetType()) return false;
return Equals((AddedNewTodoList) obj);
}
public override int GetHashCode()
{
return Id.GetHashCode() ^ (Name == null ? 0 : Name.GetHashCode());
}
public readonly Guid Id;
public readonly string Name;
public AddedNewTodoList(Guid id, string name)
{
Id = id;
Name = name;
}
}
public class AddedNewItemToTodoList
{
protected bool Equals(AddedNewItemToTodoList other)
{
return TodoListId.Equals(other.TodoListId) && TodoListItemId.Equals(other.TodoListItemId) &&
string.Equals(Description, other.Description);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != GetType()) return false;
return Equals((AddedNewItemToTodoList) obj);
}
public override int GetHashCode()
{
return TodoListId.GetHashCode() ^ TodoListItemId.GetHashCode() ^
(Description != null ? Description.GetHashCode() : 0);
}
public readonly Guid TodoListId;
public readonly Guid TodoListItemId;
public readonly string Description;
public AddedNewItemToTodoList(Guid todoListId, Guid todoListItemId, string description)
{
TodoListId = todoListId;
TodoListItemId = todoListItemId;
Description = description;
}
}
public class DescribedTodoListItem
{
protected bool Equals(DescribedTodoListItem other)
{
return string.Equals(Description, other.Description) && Id.Equals(other.Id);
}
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj)) return false;
if (ReferenceEquals(this, obj)) return true;
if (obj.GetType() != GetType()) return false;
return Equals((DescribedTodoListItem) obj);
}
public override int GetHashCode()
{
return (Description != null ? Description.GetHashCode() : 0) ^ Id.GetHashCode();
}
public readonly Guid Id;
public readonly string Description;
public DescribedTodoListItem(Guid id, string description)
{
Id = id;
Description = description;
}
}
}
}
}