private IReadOnlyDictionary <string, IStatefulProjection> CreateParallelGroup(
SearchProjector <string, SearchDocument> searchProjector) =>
new Dictionary <string, IStatefulProjection>
{
{
"main",
WrapLocalProjection("main", ProjectionHelpers.Combine(
ProjectionHelpers.Bind(
() => CachingRepositoryHelper.CreateSession(Repository, searchProjector),
repo => ProjectionHelpers.Bind(
() => CachingRepositoryHelper.CreateSession(ParentLookup),
parentLookup => (message, ct) =>
{
Handle(repo, parentLookup, message);
return(Task.CompletedTask);
}
)
),
(message) => _writeLine($"Projected {message.Checkpoint}: {message.Payload?.GetType().Name}"),
() =>
{
searchProjector.Commit();
_writeLine($"Committed");
}
))
}
};
public Fixture(Action <string> writeLine)
{
_writeLine = writeLine ?? (_ => {});
_baseDirectory = Path.Combine(Path.GetTempPath(), "local_projections", Guid.NewGuid().ToString("N"));
Directory.CreateDirectory(_baseDirectory);
EventStore = new SimpleEventStore(_baseDirectory);
CheckpointsGroup = new LocalCheckpointGroup(Path.Combine(_baseDirectory, "checkpoint"));
var searchDir = Path.Combine(_baseDirectory, "search");
Directory.CreateDirectory(searchDir);
Index = new Index(searchDir, new[]
{
new Field("name"),
new Field("value", true),
new Field("parent"),
new Field("child"),
});
IEnumerable <P> ExtractDocument(string key, SearchDocument doc)
{
_writeLine($"Extracting {doc.Name}");
yield return(new P("name", doc.Name));
yield return(new P("value", doc.Value));
foreach (var c in doc.Children ?? new string[0])
{
yield return(new P("child", c));
}
foreach (var p in doc.Parents ?? new string[0])
{
yield return(new P("parent", p));
}
}
var searchProjector = new SearchProjector <string, SearchDocument>(
Index,
"name",
ExtractDocument,
d => d.Value != null);
var mainProjectionDir = Path.Combine(_baseDirectory, "main");
Directory.CreateDirectory(mainProjectionDir);
Repository = new ObjectRepository <string, SearchDocument>(
new DefaultObjectRepositorySettings <SearchDocument>(mainProjectionDir));
var parentLookupDir = Path.Combine(_baseDirectory, "parent_lookup");
Directory.CreateDirectory(parentLookupDir);
ParentLookup = new ObjectRepository <string, List <string> >(
new DefaultObjectRepositorySettings <List <string> >(parentLookupDir));
Notifier = new PollingNotifier(EventStore.ReadHead, (ex, p) =>
{
_writeLine($"Error reading head ({p}): {ex}");
return(Task.CompletedTask);
});
Subscription = new RecoverableSubscriptionAdapter(
CreateSubscription,
() => ParallelGroupHelper.CreateObservableParallelGroup(
() => Task.FromResult(CreateParallelGroup(searchProjector)),
Observer,
() => Subscription.Restart()),
() => Observer.Min);
}
