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Merged
merged 4 commits into from
Jul 9, 2025
Merged

FetchForWriting/FetchLatest support within Batch Querying #3872

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7aba03d
Initial work on FetchForWriting() and FetchLatest() in batch querying
jeremydmiller Jul 9, 2025
b50034d
Made sure the FetchForWriting/FetchLatest batch queries can really be…
jeremydmiller Jul 9, 2025
e3ef650
Added StubEventStream. Closes GH-3863
jeremydmiller Jul 9, 2025
589195a
lint stuff
jeremydmiller Jul 9, 2025
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1 change: 0 additions & 1 deletion docs/configuration/cli.md
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Original file line number Diff line number Diff line change
Expand Up @@ -233,4 +233,3 @@ marten - Advanced Marten operations to 'heal' event store projection issues or r
[-l, --log-level Trace|Debug|Information|Warning|Error|Critical|None] Override the log level
[--config:<prop> <value>] Overwrite individual configuration items
```

209 changes: 209 additions & 0 deletions src/EventSourcingTests/FetchForWriting/fetch_latest_async_aggregate.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
using JasperFx.Events;
using Marten.Events;
using Marten.Events.Projections;
using Marten.Testing.Documents;
using Marten.Testing.Harness;
using Shouldly;
using Xunit;
Expand Down Expand Up @@ -35,6 +36,32 @@ public async Task from_no_current_activity_guid_centric()
document.CCount.ShouldBe(3);
}

[Fact]
public async Task from_no_current_activity_guid_centric_as_batch()
{
StoreOptions(opts =>
{
opts.Projections.Snapshot<SimpleAggregate>(SnapshotLifecycle.Async);
});

var streamId = Guid.NewGuid();
theSession.Events.StartStream<SimpleAggregate>(streamId, new AEvent(), new BEvent(), new BEvent(), new CEvent(),
new CEvent(), new CEvent());

await theSession.SaveChangesAsync();

await using var query = theStore.LightweightSession();
var batch = query.CreateBatchQuery();
var documentQuery = batch.Events.FetchLatest<SimpleAggregate>(streamId);
await batch.Execute();

var document = await documentQuery;

document.ACount.ShouldBe(1);
document.BCount.ShouldBe(2);
document.CCount.ShouldBe(3);
}


[Fact]
public async Task from_no_current_activity_string_centric()
Expand All @@ -59,6 +86,31 @@ public async Task from_no_current_activity_string_centric()
document.CCount.ShouldBe(3);
}

[Fact]
public async Task from_no_current_activity_string_centric_from_batch()
{
StoreOptions(opts =>
{
opts.Projections.Snapshot<SimpleAggregateAsString>(SnapshotLifecycle.Async);
opts.Events.StreamIdentity = StreamIdentity.AsString;
});

var streamId = Guid.NewGuid().ToString();
theSession.Events.StartStream<SimpleAggregateAsString>(streamId, new AEvent(), new BEvent(), new BEvent(), new CEvent(),
new CEvent(), new CEvent());

await theSession.SaveChangesAsync();

await using var query = theStore.LightweightSession();


var document = await query.Events.FetchLatest<SimpleAggregateAsString>(streamId);

document.ACount.ShouldBe(1);
document.BCount.ShouldBe(2);
document.CCount.ShouldBe(3);
}

[Fact]
public async Task from_after_fetch_for_writing_guid_centric_brand_new_1()
{
Expand All @@ -81,6 +133,34 @@ public async Task from_after_fetch_for_writing_guid_centric_brand_new_1()
aggregate.CCount.ShouldBe(3);
}

[Fact]
public async Task from_after_fetch_for_writing_guid_centric_brand_new_1_from_batch()
{
StoreOptions(opts =>
{
opts.Events.UseIdentityMapForAggregates = true;
opts.Projections.Snapshot<SimpleAggregate>(SnapshotLifecycle.Async);
});

var streamId = Guid.NewGuid();

var stream = await theSession.Events.FetchForWriting<SimpleAggregate>(streamId);
stream.AppendMany(new AEvent(), new BEvent(), new BEvent(), new CEvent(),
new CEvent(), new CEvent());
await theSession.SaveChangesAsync();

var batch = theSession.CreateBatchQuery();

var aggregateQuery = batch.Events.FetchLatest<SimpleAggregate>(streamId);
await batch.Execute();

var aggregate = await aggregateQuery;

aggregate.ACount.ShouldBe(1);
aggregate.BCount.ShouldBe(2);
aggregate.CCount.ShouldBe(3);
}

[Fact]
public async Task from_after_fetch_for_writing_guid_centric_brand_new_no_optimization()
{
Expand All @@ -103,6 +183,33 @@ public async Task from_after_fetch_for_writing_guid_centric_brand_new_no_optimiz
aggregate.CCount.ShouldBe(3);
}

[Fact]
public async Task from_after_fetch_for_writing_guid_centric_brand_new_no_optimization_from_batch()
{
StoreOptions(opts =>
{
//opts.Events.UseIdentityMapForAggregates = true;
opts.Projections.Snapshot<SimpleAggregate>(SnapshotLifecycle.Async);
});

var streamId = Guid.NewGuid();

var stream = await theSession.Events.FetchForWriting<SimpleAggregate>(streamId);
stream.AppendMany(new AEvent(), new BEvent(), new BEvent(), new CEvent(),
new CEvent(), new CEvent());
await theSession.SaveChangesAsync();

var batch = theSession.CreateBatchQuery();

var aggregateQuery = batch.Events.FetchLatest<SimpleAggregate>(streamId);
await batch.Execute();
var aggregate = await aggregateQuery;

aggregate.ACount.ShouldBe(1);
aggregate.BCount.ShouldBe(2);
aggregate.CCount.ShouldBe(3);
}


[Fact]
public async Task from_after_fetch_for_writing_guid_centric_brand_existing()
Expand Down Expand Up @@ -132,6 +239,47 @@ public async Task from_after_fetch_for_writing_guid_centric_brand_existing()
document.DCount.ShouldBe(2);
}

[Fact]
public async Task from_after_fetch_for_writing_guid_centric_brand_existing_from_batch()
{
StoreOptions(opts =>
{
opts.Projections.Snapshot<SimpleAggregate>(SnapshotLifecycle.Async);
});

var target1 = Target.Random();
var target2 = Target.Random();
theSession.Store(target1, target2);
await theSession.SaveChangesAsync();

var streamId = Guid.NewGuid();
theSession.Events.StartStream<SimpleAggregate>(streamId, new AEvent(), new BEvent(), new BEvent(), new CEvent(),
new CEvent(), new CEvent());

await theSession.SaveChangesAsync();

using var session = theStore.LightweightSession();
var stream = await session.Events.FetchForWriting<SimpleAggregate>(streamId);
stream.AppendMany(new DEvent(), new DEvent());
await session.SaveChangesAsync();

await using var query = theStore.LightweightSession();
var batch = query.CreateBatchQuery();
var targetQuery1 = batch.Load<Target>(target1.Id);
var documentQuery = batch.Events.FetchLatest<SimpleAggregate>(streamId);
var targetQuery2 = batch.Load<Target>(target2.Id);
await batch.Execute();

(await targetQuery1).ShouldNotBeNull();
var document = await documentQuery;
(await targetQuery2).ShouldNotBeNull();

document.ACount.ShouldBe(1);
document.BCount.ShouldBe(2);
document.CCount.ShouldBe(3);
document.DCount.ShouldBe(2);
}

[Fact]
public async Task from_after_fetch_for_writing_string_centric_brand_new()
{
Expand All @@ -154,6 +302,34 @@ public async Task from_after_fetch_for_writing_string_centric_brand_new()
aggregate.CCount.ShouldBe(3);
}

[Fact]
public async Task from_after_fetch_for_writing_string_centric_brand_new_with_batch()
{
StoreOptions(opts =>
{
opts.Events.StreamIdentity = StreamIdentity.AsString;
opts.Projections.Snapshot<SimpleAggregateAsString>(SnapshotLifecycle.Async);
});

var streamId = Guid.NewGuid().ToString();

var stream = await theSession.Events.FetchForWriting<SimpleAggregateAsString>(streamId);
stream.AppendMany(new AEvent(), new BEvent(), new BEvent(), new CEvent(),
new CEvent(), new CEvent());
await theSession.SaveChangesAsync();

var batch = theSession.CreateBatchQuery();

var aggregateQuery = batch.Events.FetchLatest<SimpleAggregateAsString>(streamId);
await batch.Execute();

var aggregate = await aggregateQuery;

aggregate.ACount.ShouldBe(1);
aggregate.BCount.ShouldBe(2);
aggregate.CCount.ShouldBe(3);
}

[Fact]
public async Task from_after_fetch_for_writing_string_centric_existing()
{
Expand Down Expand Up @@ -183,6 +359,38 @@ public async Task from_after_fetch_for_writing_string_centric_existing()
document.DCount.ShouldBe(2);
}

[Fact]
public async Task from_after_fetch_for_writing_string_centric_existing_with_batch()
{
StoreOptions(opts =>
{
opts.Events.StreamIdentity = StreamIdentity.AsString;
opts.Projections.Snapshot<SimpleAggregateAsString>(SnapshotLifecycle.Async);
});

var streamId = Guid.NewGuid().ToString();
theSession.Events.StartStream<SimpleAggregate>(streamId, new AEvent(), new BEvent(), new BEvent(), new CEvent(),
new CEvent(), new CEvent());

await theSession.SaveChangesAsync();

using var session = theStore.LightweightSession();
var stream = await session.Events.FetchForWriting<SimpleAggregateAsString>(streamId);
stream.AppendMany(new DEvent(), new DEvent());
await session.SaveChangesAsync();

await using var query = theStore.LightweightSession();
var batch = session.CreateBatchQuery();
var documentQuery = batch.Events.FetchLatest<SimpleAggregateAsString>(streamId);
await batch.Execute();
var document = await documentQuery;

document.ACount.ShouldBe(1);
document.BCount.ShouldBe(2);
document.CCount.ShouldBe(3);
document.DCount.ShouldBe(2);
}

[Fact]
public async Task fetch_latest_immutable_aggregate_running_inline()
{
Expand Down Expand Up @@ -238,6 +446,7 @@ public async Task fetch_latest_immutable_aggregate_running_inline_and_identity_m
var aggregate2 = await session2.Events.FetchLatest<TestAggregateImmutable>(streamId);
aggregate2.Name.ShouldBe("Random");
}

}

public record CreatedEvent(Guid Id, string Name, Dictionary<int, string> TestData);
Expand Down
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