/// <summary>
/// Initializes a new instance of the <see cref="ReadModelCatchup{TDbContext}" /> class.
/// </summary>
/// <param name="readModelDbContext">A delegate to create read model database contexts on demand.</param>
/// <param name="eventStoreDbContext">A delegate to create event store database contexts on demand.</param>
/// <param name="startAtEventId">The event id that the catchup should start from.</param>
/// <param name="batchSize">The number of events queried from the event store at each iteration.</param>
/// <param name="filter">An optional filter expression to constrain the query that the catchup uses over the event store.</param>
/// <param name="projectors">The projectors to be updated as new events are added to the event store.</param>
/// <exception cref="System.ArgumentNullException">
/// </exception>
/// <exception cref="System.ArgumentException">You must specify at least one projector.</exception>
public ReadModelCatchup(
Func <DbContext> readModelDbContext,
Func <EventStoreDbContext> eventStoreDbContext,
long startAtEventId = 0,
int batchSize = 10000,
Expression <Func <StorableEvent, bool> > filter = null,
params object[] projectors)
{
if (readModelDbContext == null)
{
throw new ArgumentNullException(nameof(readModelDbContext));
}
if (eventStoreDbContext == null)
{
throw new ArgumentNullException(nameof(eventStoreDbContext));
}
if (!projectors.OrEmpty().Any())
{
throw new ArgumentException("You must specify at least one projector.");
}
if (batchSize < 1)
{
throw new ArgumentException($"Argument {nameof(batchSize)} must be at least 1.");
}
createReadModelDbContext = readModelDbContext;
createEventStoreDbContext = eventStoreDbContext;
this.startAtEventId = startAtEventId;
this.filter = filter;
this.projectors = new List <object>(projectors);
this.batchSize = batchSize;
EnsureProjectorNamesAreDistinct();
cancellationDisposable = new CancellationDisposable();
disposables = new CompositeDisposable
{
cancellationDisposable,
Disposable.Create(() => progress.OnCompleted())
};
bus = new InProcessEventBus(new Subject <IEvent>());
disposables.Add(bus.ReportErrorsToDatabase(() => createReadModelDbContext()));
disposables.Add(bus);
Sensors.ReadModelDbContexts.GetOrAdd(typeof(TDbContext).Name, createReadModelDbContext);
}
/// <summary>
/// Initializes a new instance of the <see cref="ReadModelCatchup{TDbContext}"/> class.
/// </summary>
/// <param name="projectors">The projectors to be updated as new events are added to the event store.</param>
/// <exception cref="System.ArgumentException">You must specify at least one projector.</exception>
public ReadModelCatchup(params object[] projectors)
{
if (!projectors.OrEmpty().Any())
{
throw new ArgumentException("You must specify at least one projector.");
}
this.projectors = new List <object>(projectors);
EnsureProjectorNamesAreDistinct();
cancellationDisposable = new CancellationDisposable();
disposables = new CompositeDisposable
{
cancellationDisposable,
Disposable.Create(() => progress.OnCompleted())
};
bus = new InProcessEventBus(new Subject <IEvent>());
disposables.Add(bus.ReportErrorsToDatabase(() => CreateReadModelDbContext()));
disposables.Add(bus);
Sensors.ReadModelDbContexts.GetOrAdd(typeof(TDbContext).Name, CreateReadModelDbContext);
}