public async Task WithinPartition_by_range_correctly_partitions_queries_by_int()
{
var id = Guid.NewGuid().ToString();
await WriteEvents(i => new Event
{
SequenceNumber = i,
Id = id
});
var stream = Stream.PartitionedByRange<Event, int, int>(async (q, p) =>
{
using (var db = new AlluvialSqlTestsDbContext())
{
return await db.Events
.Where(e => e.Id == id)
.WithinPartition(e => e.SequenceNumber, p)
.ToArrayAsync();
}
});
var catchup = stream.DistributeAmong(Partition.ByRange(0, 100).Among(5));
var store = new InMemoryProjectionStore<int>();
catchup.Subscribe(async (count, events) => events.Count, store);
await catchup.RunSingleBatch();
store.Select(x => x).Should().BeEquivalentTo(new[] { 20, 20, 20, 20, 20 });
}
public async Task WithinPartition_by_range_correctly_partitions_queries_by_string()
{
var guid = Guid.NewGuid();
var partitions = new[]
{
Partition.ByRange("", "mm"),
Partition.ByRange("mm", "zz")
};
Values.AtoZ()
.ToList()
.ForEach(c =>
WriteEvents(i => new Event
{
SequenceNumber = i,
Guid = guid,
Id = c + " " + Guid.NewGuid()
}, 10).Wait());
var stream = Stream.PartitionedByRange<Event, int, string>(async (q, p) =>
{
using (var db = new AlluvialSqlTestsDbContext())
{
return await db.Events
.Where(e => e.Guid == guid)
.WithinPartition(e => e.Id, p)
.ToArrayAsync();
}
});
var catchup = stream.DistributeAmong(partitions);
var store = new InMemoryProjectionStore<int>();
catchup.Subscribe(async (count, events) => events.Count, store);
await catchup.RunSingleBatch();
store.Select(x => x).Should().BeEquivalentTo(new[] { 130, 130 });
}
private static async Task WriteEvents(Func<int, Event> createEvent, int howMany = 100)
{
using (var db = new AlluvialSqlTestsDbContext())
{
for (var i = 1; i <= howMany; i++)
{
db.Events.Add(createEvent(i));
}
await db.SaveChangesAsync();
}
}