public CheckpointProjection(
IStatefulProjection inner,
CheckpointStore checkpointStore,
Action <AllStreamPosition> notifyCheckpoint = null)
{
_inner = inner;
_checkpointStore = checkpointStore;
_notifyCheckpoint = notifyCheckpoint;
_lastCheckpoint = _checkpointStore.Read();
_notifyCheckpoint?.Invoke(AllStreamPosition.FromNullableInt64(_lastCheckpoint));
}
public static IStatefulProjection Wrap(
ProjectionGroupStateObserver observer,
string name,
IStatefulProjection projection) =>
new StatefulProjectionBuilder(projection)
.Use(projectMidfunc: downstream => async(message, ct) =>
{
if (observer[name].Checkpoint >= message.Checkpoint)
{
return;
}
await downstream(message, ct).ConfigureAwait(false);
observer.MoveTo(name, message.Checkpoint);
})
.UseSuspendOnException(ex => observer.Suspend(name, ex))
.Build();
public StatefulProjectionBuilder(IStatefulProjection projection = null) =>
private IStatefulProjection WrapLocalProjection(string name, IStatefulProjection projection) => new StatefulProjectionBuilder(projection) .UseCheckpointStore(CheckpointsGroup.GetCheckpointStore(name), cp => Observer.MoveTo(name, cp)) .UseCommitEvery() .UseSuspendOnException(ex => Observer.Suspend(name, ex)) .Build();
public static IStatefulProjection Combine(IStatefulProjection projection,
Action <Envelope> project = null,
Action commit = null) =>
Combine(projection, new DelegateProjection((m, ct) => Async(() => project?.Invoke(m)), _ => Async(commit)));
public CommitNthProjection(IStatefulProjection inner, int maxBatchSize = 2048)
{
_inner = inner;
_maxBatchSize = maxBatchSize;
}
public SuspendableProjection(IStatefulProjection inner, Action <Exception> onSuspend = null)
{
_inner = inner;
_onSuspend = onSuspend;
}
