protected override void ApplyState(ReadModelState snapshot)
{
if (snapshot?.State == null)
{
throw new ArgumentNullException(nameof(snapshot), $"Null State provided to {nameof(TestSnapShotReadModel)}");
}
if (!(snapshot.State is MyState))
{
throw new ArgumentException($"Unknown state object: Expected {nameof(MyState)}, got {snapshot.State.GetType().Name}");
}
var state = (MyState)snapshot.State;
Count = state.Count;
Sum = state.Sum;
}
public void can_apply_snapshot_to_read_model()
{
var snapshot = new ReadModelState(
nameof(TestSnapShotReadModel),
new List <Tuple <string, long> > {
new Tuple <string, long>(_stream, 9)
},
new TestSnapShotReadModel.MyState {
Count = 10, Sum = 20
});
var rm = new TestSnapShotReadModel(_aggId, GetListener, snapshot);
AssertEx.IsOrBecomesTrue(() => rm.Count == 10);
AssertEx.IsOrBecomesTrue(() => rm.Sum == 20);
AppendEvents(1, _conn, _stream, 5);
AssertEx.IsOrBecomesTrue(() => rm.Count == 11, 1000);
AssertEx.IsOrBecomesTrue(() => rm.Sum == 25);
}
public void can_restore_state_without_checkpoints()
{
var snapshot = new ReadModelState(
nameof(TestSnapShotReadModel),
null, //no streams provided
new TestSnapShotReadModel.MyState {
Count = 10, Sum = 20
});
var rm = new TestSnapShotReadModel(_aggId, GetListener, snapshot);
AssertEx.IsOrBecomesTrue(() => rm.Count == 10);
AssertEx.IsOrBecomesTrue(() => rm.Sum == 20);
//n.b. will not start listening because no streams are provided
//confirm not listening
AppendEvents(1, _conn, _stream, 5);
AssertEx.IsOrBecomesTrue(() => rm.Count == 10, 1000);
AssertEx.IsOrBecomesTrue(() => rm.Sum == 20);
//can manually start
rm.Start <SnapReadModelTestAggregate>(_aggId, 9, true);
AssertEx.IsOrBecomesTrue(() => rm.Count == 11, 1000);
AssertEx.IsOrBecomesTrue(() => rm.Sum == 25);
AppendEvents(1, _conn, _stream, 5);
AssertEx.IsOrBecomesTrue(() => rm.Count == 12, 1000);
AssertEx.IsOrBecomesTrue(() => rm.Sum == 30);
//can still get complete snapshot
var snap2 = rm.GetState();
//works as expected
var rm2 = new TestSnapShotReadModel(_aggId, GetListener, snap2);
AssertEx.IsOrBecomesTrue(() => rm2.Count == 12, 1000);
AssertEx.IsOrBecomesTrue(() => rm2.Sum == 30);
AppendEvents(1, _conn, _stream, 5);
AssertEx.IsOrBecomesTrue(() => rm2.Count == 13, 1000);
AssertEx.IsOrBecomesTrue(() => rm2.Sum == 35);
}
public TestSnapShotReadModel(
Guid aggId,
Func <IListener> getListener,
ReadModelState snapshot,
bool forceDoubleRestoreError = false) :
base(nameof(TestSnapShotReadModel), getListener)
{
// ReSharper disable once RedundantTypeArgumentsOfMethod
EventStream.Subscribe <SnapReadModelTestEvent>(this);
if (snapshot is null)
{
Start <SnapReadModelTestAggregate>(aggId, null, true);
}
else
{
Restore(snapshot);
}
if (forceDoubleRestoreError)
{
Restore(snapshot);
}
}
