public void using_live_transformed_events(IDocumentSession session)
{
var started = new QuestStarted {
Name = "Find the Orb"
};
var joined = new MembersJoined {
Day = 2, Location = "Faldor's Farm", Members = new string[] { "Garion", "Polgara", "Belgarath" }
};
var slayed1 = new MonsterSlayed {
Name = "Troll"
};
var slayed2 = new MonsterSlayed {
Name = "Dragon"
};
MembersJoined joined2 = new MembersJoined {
Day = 5, Location = "Sendaria", Members = new string[] { "Silk", "Barak" }
};
session.Events.StartStream <Quest>(started, joined, slayed1, slayed2);
session.SaveChanges();
// Our MonsterDefeated documents are created inline
// with the SaveChanges() call above and are available
// for querying
session.Query <MonsterDefeated>().Count()
.ShouldBe(2);
}
public void build_event()
{
var slayed = new MonsterSlayed {
Name = "The Gorgon"
};
var @event = theGraph.BuildEvent(slayed);
@event.ShouldBeOfType <Event <MonsterSlayed> >();
@event.Data.ShouldBe(slayed);
var mapping = theGraph.EventMappingFor <MonsterSlayed>();
@event.EventTypeName.ShouldBe(mapping.EventTypeName);
@event.DotNetTypeName.ShouldBe(mapping.DotNetTypeName);
}
public void SampleCopyAndTransformStream()
{
#region sample_scenario-copyandtransformstream-setup
var started = new QuestStarted {
Name = "Find the Orb"
};
var joined = new MembersJoined {
Day = 2, Location = "Faldor's Farm", Members = new[] { "Garion", "Polgara", "Belgarath" }
};
var slayed1 = new MonsterSlayed {
Name = "Troll"
};
var slayed2 = new MonsterSlayed {
Name = "Dragon"
};
using (var session = theStore.OpenSession())
{
session.Events.StartStream <Quest>(started.Name, started, joined, slayed1, slayed2);
session.SaveChanges();
}
#endregion
#region sample_scenario-copyandtransformstream-transform
using (var session = theStore.OpenSession())
{
var events = session.Events.FetchStream(started.Name);
var transformedEvents = events.SelectMany(x =>
{
switch (x.Data)
{
case MonsterSlayed monster:
{
// Trolls we remove from our transformed stream
return(monster.Name.Equals("Troll") ? new object[] { } : new[] { monster });
}
case MembersJoined members:
{
// MembersJoined events we transform into a series of events
return(MemberJoined.From(members));
}
}
return(new[] { x.Data });
}).Where(x => x != null).ToArray();
var moveTo = $"{started.Name} without Trolls";
// We copy the transformed events to a new stream
session.Events.StartStream <Quest>(moveTo, transformedEvents);
// And additionally mark the old stream as moved. Furthermore, we assert on the new expected stream version to guard against any racing updates
session.Events.Append(started.Name, events.Count + 1, new StreamMovedTo
{
To = moveTo
});
// Transactionally update the streams.
session.SaveChanges();
}
#endregion
}
