public Model LoadModel(Type modelType = null)
{
Model model = null;
//Try to load from the most recent snapshot
var snapshotInfo = _snapshotStore.Snapshots.LastOrDefault();
if (snapshotInfo != null)
{
model = _snapshotStore.LoadSnapshot(snapshotInfo);
model.SnapshotRestored();
}
//If no snapshot present see if the first journal entry is of type ModelCreated
if (model == null)
{
var firstJournalEntry = _commandStore.GetJournalEntries()
.Take(1)
.OfType <JournalEntry <ModelCreated> >()
.SingleOrDefault();
if (firstJournalEntry != null)
{
modelType = firstJournalEntry.Item.Type;
}
if (modelType == null)
{
throw new InvalidOperationException("No model type present");
}
model = (Model)Activator.CreateInstance(modelType);
}
var ctx = Execution.Begin();
//Replay commands
foreach (var commandEntry in _commandStore.CommandEntriesFrom(model.Revision + 1))
{
ctx.Now = commandEntry.Created;
commandEntry.Item.Redo(ref model);
ctx.Events.Clear();
model.Revision++;
}
model.JournalRestored();
return(model);
}
public void RollbackMarkerIsWrittenOnRollback()
{
//Arrange
Execution.Begin();
var config = new EngineConfiguration().ForIsolatedTest();
var store = new InMemoryCommandStore(config);
store.Initialize();
var target = new JournalAppender(1, new StreamJournalWriter(config, store.CreateJournalWriterStream));
var command = new ACommand();
target.Append(command);
target.Append(command);
//Act
target.AppendRollbackMarker();
//Assert
Assert.AreEqual(3, store.GetJournalEntries().Count());
Assert.AreEqual(1, store.GetJournalEntries().OfType <JournalEntry <RollbackMarker> >().Count());
Assert.IsTrue(store.GetJournalEntries().Last() is JournalEntry <RollbackMarker>);
}
public void Timestamp_is_copied_to_journal_entry()
{
JournalEntry entry = null;
var fake = A.Fake <IJournalWriter>();
A.CallTo(() => fake.Write(A <JournalEntry> ._))
.Invokes((JournalEntry je) =>
{
entry = je;
});
var before = DateTime.Now;
Execution.Begin();
var command = new SetTimeCommand();
var target = new JournalAppender(0, fake);
var after = DateTime.Now;
target.Append(command);
Assert.IsNotNull(entry);
Assert.IsTrue(before <= entry.Created && entry.Created <= after);
}
