public async Task <object> RunAsync(ExpectEventsScenario scenario, CancellationToken ct = default(CancellationToken))
{
var checkpoint = await WriteGivens(scenario.Givens);
var envelope = scenario.When is CommandEnvelope
? (CommandEnvelope)scenario.When
: new CommandEnvelope()
.SetCommand(scenario.When)
.SetCommandId(Guid.NewGuid())
.SetCorrelationId(Guid.NewGuid())
.SetSourceId(Guid.NewGuid());
var exception = await Catch.Exception(() => _invoker.Invoke(envelope, ct));
if (exception != null)
{
return(scenario.ButThrewException(exception));
}
var recordedEvents = await ReadThens(checkpoint);
if (scenario.Givens.Length != 0 && recordedEvents.Length != 0)
{
recordedEvents = recordedEvents.Skip(1).ToArray();
}
var config = new ComparisonConfig
{
MaxDifferences = int.MaxValue,
MaxStructDepth = 5,
MembersToIgnore = new List <string>
{
"MsgId"
}
};
var comparer = new CompareLogic(config);
var expectedEvents = Array.ConvertAll(scenario.Thens,
then => new ReactiveDomain.Testing.RecordedEvent(_converter(new StreamName(then.Stream)), then.Event));
var result = comparer.Compare(expectedEvents, recordedEvents);
if (result.AreEqual)
{
return(scenario.Pass());
}
return(scenario.ButRecordedOtherEvents(recordedEvents)); //, result.Differences.ToArray()
}
public static void Usage()
{
var groupId = new GroupIdentifier(Guid.NewGuid());
var groupName = new GroupName("Elvis Fanclub");
var john = new GroupAdministratorIdentifier(Guid.NewGuid());
var jane = new GroupAdministratorIdentifier(Guid.NewGuid());
//Start a group (imagine a command)
var group = Group.Start(groupId, groupName, john);
PrintRecords(group);
//Stop a group (imagine a command)
group.Stop(jane);
PrintRecords(group);
//Take a snapshot of the group
var source = (ISnapshotSource)group;
var snapshot = source.TakeSnapshot();
//Restore another instance from the snapshot
var groupFromStore = Group.Factory();
var destination = (ISnapshotSource)groupFromStore;
destination.RestoreFromSnapshot(snapshot);
//Here's an example of a composition root
var settings = new JsonSerializerSettings();
var invoker = new CommandHandlerInvoker(
new CommandHandlerModule[]
{
new GroupModule(
new GroupRepository(
null, /* todo - connection to embedded eventstore */
new EventSourceReaderConfiguration(
StreamNameConversions.PassThru,
() =>
new StreamEventsSliceTranslator(
typeName => Type.GetType(typeName, true),
settings),
new SliceSize(100)),
new EventSourceWriterConfiguration(
StreamNameConversions.PassThru,
new EventSourceChangesetTranslator(type => type.FullName, settings))))
});
// Somewhere in the infrastructure, probably as part of an IHandleCommand<> (see below)
var command =
/* typically comes from the wire, here in deserialized shape. */
new StartGroup(Guid.NewGuid(), "Fans of Elvis", Guid.NewGuid());
invoker.Invoke(new CommandEnvelope().SetCommand(command)).Wait(); //Don't block obviously, go full async.
}
