private void Start <TContext>(IConnectedProjection <TContext> projection)
where TContext : RunnerDbContext <TContext>
{
if (projection == null || _registeredProjections.IsProjecting(projection.Name))
{
return;
}
_projectionCatchUps.Add(projection.Name, new CancellationTokenSource());
var projectionCatchUp = new ConnectedProjectionCatchUp <TContext>(
projection.Name,
_streamStore,
projection.ContextFactory,
projection.ConnectedProjectionMessageHandler,
_commandBus,
_logger);
TaskRunner.Dispatch(async() => await projectionCatchUp.CatchUpAsync(_projectionCatchUps[projection.Name].Token));
}
public When_a_projection_catch_up_processes_a_stream_and_throws_a_detected_stream_gap_exception()
{
var fixture = new Fixture()
.CustomizeConnectedProjectionIdentifiers();
var contextMock = new Mock <IConnectedProjectionContext <FakeProjectionContext> >();
contextMock
.Setup(context => context.GetProjectionPosition(It.IsAny <ConnectedProjectionIdentifier>(), It.IsAny <CancellationToken>()))
.ReturnsAsync((long?)null);
var streamMock = new Mock <IReadonlyStreamStore>();
streamMock
.Setup(store =>
store.ReadAllForwards(
It.IsAny <long>(),
It.IsAny <int>(),
It.IsAny <bool>(),
It.IsAny <CancellationToken>()))
.ReturnsAsync(() =>
{
var position = fixture.CreatePositive <long>().WithMaximumValueOf(long.MaxValue - 1000);
return(new ReadAllPage(
position,
position.CreateRandomHigherValue(),
true,
ReadDirection.Forward,
(p, token) => throw new NotImplementedException(),
fixture.CreateMany <StreamMessage>(2, 10).ToArray()));
});
_commandBusMock = new Mock <IConnectedProjectionsCommandBus>();
_gapStrategySettings = fixture.Create <StreamGapStrategyConfigurationSettings>();
var gapStrategyMock = new Mock <IStreamGapStrategy>();
gapStrategyMock
.SetupGet(strategy => strategy.Settings)
.Returns(_gapStrategySettings);
_loggerMock = new FakeLogger();
_projection = new FakeProjection(
"catch-up-dummy",
(messages, strategy, name, ct)
=> throw new ConnectedProjectionMessageHandlingException(
new StreamGapDetectedException(fixture.CreateMany <long>(1, 10), name),
name,
new ActiveProcessedStreamState(0)),
contextMock.Object);
var sut = new ConnectedProjectionCatchUp <FakeProjectionContext>(
_projection,
ConnectedProjectionSettings.Default,
streamMock.Object,
_commandBusMock.Object,
gapStrategyMock.Object,
_loggerMock.AsLogger());
sut.CatchUpAsync(CancellationToken.None).GetAwaiter();
}