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Added example of using Composite Keys with Marten
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297 changes: 297 additions & 0 deletions
297
Marten.Integration.Tests/CompositeIds/CompositeIdsTests.cs
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using System; | ||
using System.Collections.Generic; | ||
using System.Linq; | ||
using FluentAssertions; | ||
using Marten.Integration.Tests.TestsInfrastructure; | ||
using Newtonsoft.Json; | ||
using Weasel.Postgresql; | ||
using Xunit; | ||
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namespace Marten.Integration.Tests.CompositeIds; | ||
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public class StronglyTypedValue<T>: IEquatable<StronglyTypedValue<T>> where T: IComparable<T> | ||
{ | ||
public T Value { get; } | ||
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public StronglyTypedValue(T value) | ||
{ | ||
Value = value; | ||
} | ||
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public bool Equals(StronglyTypedValue<T>? other) | ||
{ | ||
if (ReferenceEquals(null, other)) return false; | ||
if (ReferenceEquals(this, other)) return true; | ||
return EqualityComparer<T>.Default.Equals(Value, other.Value); | ||
} | ||
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public override bool Equals(object? obj) | ||
{ | ||
if (ReferenceEquals(null, obj)) return false; | ||
if (ReferenceEquals(this, obj)) return true; | ||
if (obj.GetType() != this.GetType()) return false; | ||
return Equals((StronglyTypedValue<T>)obj); | ||
} | ||
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public override int GetHashCode() | ||
{ | ||
return EqualityComparer<T>.Default.GetHashCode(Value); | ||
} | ||
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public static bool operator ==(StronglyTypedValue<T>? left, StronglyTypedValue<T>? right) | ||
{ | ||
return Equals(left, right); | ||
} | ||
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public static bool operator !=(StronglyTypedValue<T>? left, StronglyTypedValue<T>? right) | ||
{ | ||
return !Equals(left, right); | ||
} | ||
} | ||
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public class ReservationId: StronglyTypedValue<Guid> | ||
{ | ||
public ReservationId(Guid value) : base(value) | ||
{ | ||
} | ||
}; | ||
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public class CustomerId: StronglyTypedValue<Guid> | ||
{ | ||
public CustomerId(Guid value) : base(value) | ||
{ | ||
} | ||
}; | ||
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public class SeatId: StronglyTypedValue<Guid> | ||
{ | ||
public SeatId(Guid value) : base(value) | ||
{ | ||
} | ||
}; | ||
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public class ReservationNumber: StronglyTypedValue<string> | ||
{ | ||
public ReservationNumber(string value) : base(value) | ||
{ | ||
} | ||
}; | ||
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public record TentativeReservationCreated( | ||
ReservationId ReservationId, | ||
SeatId SeatId, | ||
CustomerId CustomerId, | ||
ReservationNumber Number | ||
); | ||
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public record ReservationSeatChanged( | ||
ReservationId ReservationId, | ||
SeatId SeatId | ||
); | ||
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public record ReservationConfirmed( | ||
ReservationId ReservationId | ||
); | ||
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public record ReservationCancelled( | ||
ReservationId ReservationId | ||
); | ||
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public abstract class Aggregate<TKey, T> | ||
where TKey: StronglyTypedValue<T> | ||
where T : IComparable<T> | ||
{ | ||
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public TKey AggregateId { get; set; } = default!; | ||
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public T Id | ||
{ | ||
get => AggregateId.Value; | ||
set {} | ||
} | ||
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public int Version { get; protected set; } | ||
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[JsonIgnore] private readonly Queue<object> uncommittedEvents = new(); | ||
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public object[] DequeueUncommittedEvents() | ||
{ | ||
var dequeuedEvents = uncommittedEvents.ToArray(); | ||
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uncommittedEvents.Clear(); | ||
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return dequeuedEvents; | ||
} | ||
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protected void Enqueue(object @event) | ||
{ | ||
uncommittedEvents.Enqueue(@event); | ||
} | ||
} | ||
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public enum ReservationStatus | ||
{ | ||
Tentative, | ||
Confirmed, | ||
Cancelled | ||
} | ||
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public class Reservation : Aggregate<ReservationId, Guid> | ||
{ | ||
public CustomerId CustomerId { get; private set; } = default!; | ||
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public SeatId SeatId { get; private set; } = default!; | ||
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public ReservationNumber Number { get; private set; } = default!; | ||
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public ReservationStatus Status { get; private set; } | ||
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public static Reservation CreateTentative( | ||
SeatId seatId, | ||
CustomerId customerId) | ||
{ | ||
return new Reservation( | ||
new ReservationId(Guid.NewGuid()), | ||
seatId, | ||
customerId, | ||
new ReservationNumber(Guid.NewGuid().ToString()) | ||
); | ||
} | ||
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private Reservation(){} | ||
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private Reservation( | ||
ReservationId aggregateId, | ||
SeatId seatId, | ||
CustomerId customerId, | ||
ReservationNumber reservationNumber | ||
) | ||
{ | ||
var @event = new TentativeReservationCreated( | ||
aggregateId, | ||
seatId, | ||
customerId, | ||
reservationNumber | ||
); | ||
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Enqueue(@event); | ||
Apply(@event); | ||
} | ||
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public void ChangeSeat(SeatId newSeatId) | ||
{ | ||
if(Status != ReservationStatus.Tentative) | ||
throw new InvalidOperationException($"Changing seat for the reservation in '{Status}' status is not allowed."); | ||
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var @event = new ReservationSeatChanged(AggregateId, newSeatId); | ||
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Enqueue(@event); | ||
Apply(@event); | ||
} | ||
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public void Confirm() | ||
{ | ||
if(Status != ReservationStatus.Tentative) | ||
throw new InvalidOperationException($"Only tentative reservation can be confirmed (current status: {Status}."); | ||
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var @event = new ReservationConfirmed(AggregateId); | ||
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Enqueue(@event); | ||
Apply(@event); | ||
} | ||
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public void Cancel() | ||
{ | ||
if(Status != ReservationStatus.Tentative) | ||
throw new InvalidOperationException($"Only tentative reservation can be cancelled (current status: {Status})."); | ||
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var @event = new ReservationCancelled(AggregateId); | ||
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Enqueue(@event); | ||
Apply(@event); | ||
} | ||
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public void Apply(TentativeReservationCreated @event) | ||
{ | ||
AggregateId = @event.ReservationId; | ||
SeatId = @event.SeatId; | ||
CustomerId = @event.CustomerId; | ||
Number = @event.Number; | ||
Status = ReservationStatus.Tentative; | ||
Version++; | ||
} | ||
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public void Apply(ReservationSeatChanged @event) | ||
{ | ||
SeatId = @event.SeatId; | ||
Version++; | ||
} | ||
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public void Apply(ReservationConfirmed @event) | ||
{ | ||
Status = ReservationStatus.Confirmed; | ||
Version++; | ||
} | ||
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public void Apply(ReservationCancelled @event) | ||
{ | ||
Status = ReservationStatus.Cancelled; | ||
Version++; | ||
} | ||
} | ||
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public class CompositeIdsTests: MartenTest | ||
{ | ||
private const string FirstTenant = "Tenant1"; | ||
private const string SecondTenant = "Tenant2"; | ||
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protected override IDocumentSession CreateSession(Action<StoreOptions>? setStoreOptions = null) | ||
{ | ||
var store = DocumentStore.For(options => | ||
{ | ||
options.Connection(Settings.ConnectionString); | ||
options.AutoCreateSchemaObjects = AutoCreate.All; | ||
options.DatabaseSchemaName = SchemaName; | ||
options.Events.DatabaseSchemaName = SchemaName; | ||
options.UseDefaultSerialization(nonPublicMembersStorage: NonPublicMembersStorage.All); | ||
options.Projections.SelfAggregate<Reservation>(); | ||
}); | ||
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return store.OpenSession(); | ||
} | ||
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[Fact] | ||
public void GivenAggregateWithCompositeId_WhenAppendedEvent_LiveAndInlineAggregationWorks() | ||
{ | ||
var seatId = new SeatId(Guid.NewGuid()); | ||
var customerId = new CustomerId(Guid.NewGuid()); | ||
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var reservation = Reservation.CreateTentative(seatId, customerId); | ||
var @event = reservation.DequeueUncommittedEvents().Single(); | ||
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//1. Create events | ||
EventStore.Append(reservation.Id, @event); | ||
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Session.SaveChanges(); | ||
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//2. Get live agregation | ||
var issuesListFromLiveAggregation = EventStore.AggregateStream<Reservation>(reservation.Id); | ||
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//3. Get inline aggregation | ||
var issuesListFromInlineAggregation = Session.Load<Reservation>(reservation.Id); | ||
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issuesListFromLiveAggregation.Should().NotBeNull(); | ||
issuesListFromInlineAggregation.Should().NotBeNull(); | ||
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issuesListFromLiveAggregation!.Id.Should().Be(reservation.Id); | ||
issuesListFromInlineAggregation!.Id.Should().Be(reservation.Id); | ||
} | ||
} | ||
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