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164 lines (141 loc) · 4.89 KB
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using System;
using System.Collections.Generic;
using AggregateSource;
using NUnit.Framework;
namespace SampleSource
{
namespace UsingDomainEvents
{
using Messaging;
[TestFixture]
public class SampleUsage
{
[Test]
public void Test()
{
var dispatched = false;
using (DomainEventDispatcher.Subscribe<AddedNewTodoList>(@event => { dispatched = true; }))
{
var _ = new TodoList(
new TodoListId(Guid.NewGuid()), "Before my 40th birthday");
}
Assert.IsTrue(dispatched);
}
}
public class DomainEventAwareAggregateRootEntity : AggregateRootEntity
{
protected override void BeforeApply(object @event)
{
DomainEventDispatcher.Publish(@event);
}
}
public static class DomainEventDispatcher
{
[ThreadStatic] static Dictionary<Type, List<Action<object>>> _index;
public static IDisposable Subscribe<TEvent>(Action<TEvent> handler)
{
if (handler == null) throw new ArgumentNullException("handler");
if (_index == null)
_index = new Dictionary<Type, List<Action<object>>>();
List<Action<object>> handlers;
if (!_index.TryGetValue(typeof (TEvent), out handlers))
{
handlers = new List<Action<object>>();
_index.Add(typeof (TEvent), handlers);
}
var action = new Action<Object>(@event => handler((TEvent) @event));
handlers.Add(action);
return new Disposable(() => handlers.Remove(action));
}
public static void Publish(object @event)
{
if (@event == null) throw new ArgumentNullException("event");
List<Action<object>> handlers;
if (!_index.TryGetValue(@event.GetType(), out handlers)) return;
foreach (var handler in handlers)
{
handler(@event);
}
}
class Disposable : IDisposable
{
readonly Action _disposer;
bool _disposed;
public Disposable(Action disposer)
{
if (disposer == null) throw new ArgumentNullException("disposer");
_disposer = disposer;
}
public void Dispose()
{
if (_disposed) return;
_disposer();
_disposed = true;
}
}
}
public class TodoList : DomainEventAwareAggregateRootEntity
{
TodoList() {}
public TodoList(TodoListId id, string name)
: this()
{
Apply(new AddedNewTodoList(id, name));
}
// state
}
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;
}
}
}
}
}