private void Commands()
{
AwaitingSubscription();
Command <Match>(m => TickerSymbol.Equals(m.StockId), m =>
{
_log.Info("Received MATCH for {0} - price: {1} quantity: {2}", TickerSymbol, m.SettlementPrice, m.Quantity);
if (_matchAggregate == null)
{
_matchAggregate = new MatchAggregate(TickerSymbol, m.SettlementPrice, m.Quantity);
return;
}
if (!_matchAggregate.WithMatch(m))
{
// should never get to here
_log.Warning("Received Match for ticker symbol [{0}] - but we only accept symbols for [{1}]", m.StockId, TickerSymbol);
}
});
// Matches for a different ticker symbol
Command <Match>(m =>
{
_log.Warning("Received Match for ticker symbol [{0}] - but we only accept symbols for [{1}]", m.StockId, TickerSymbol);
});
// Command sent to pull down a complete snapshot of active pricing data for this ticker symbol
Command <FetchPriceAndVolume>(f =>
{
// no price data yet
if (_priceUpdates.Count == 0 || _volumeUpdates.Count == 0)
{
Sender.Tell(PriceAndVolumeSnapshot.Empty(TickerSymbol));
}
else
{
Sender.Tell(new PriceAndVolumeSnapshot(TickerSymbol, _priceUpdates.ToArray(), _volumeUpdates.ToArray()));
}
});
Command <PublishEvents>(p =>
{
if (_matchAggregate == null)
{
return;
}
var(latestPrice, latestVolume) = _matchAggregate.FetchMetrics(_timestamper);
// Need to update pricing records prior to persisting our state, since this data is included in
// output of SaveAggregateData()
_priceUpdates.Add(latestPrice);
_volumeUpdates.Add(latestVolume);
PersistAsync(SaveAggregateData(), snapshot =>
{
_log.Info("Saved latest price {0} and volume {1}", snapshot.RecentAvgPrice, snapshot.RecentAvgVolume);
if (LastSequenceNr % SnapshotEveryN == 0)
{
SaveSnapshot(snapshot);
}
});
// publish updates to price and volume subscribers
_marketEventPublisher.Publish(TickerSymbol, latestPrice);
_marketEventPublisher.Publish(TickerSymbol, latestVolume);
});
Command <Ping>(p =>
{
if (_log.IsDebugEnabled)
{
_log.Debug("pinged via {0}", Sender);
}
});
Command <SaveSnapshotSuccess>(s =>
{
// clean-up prior snapshots and journal events
DeleteSnapshots(new SnapshotSelectionCriteria(s.Metadata.SequenceNr - 1));
DeleteMessages(s.Metadata.SequenceNr);
});
/*
* Handle subscriptions directly in case we're using in-memory, local pub-sub.
*/
CommandAsync <MarketSubscribe>(async sub =>
{
try
{
var ack = await _marketEventSubscriptionManager.Subscribe(TickerSymbol, sub.Events, sub.Subscriber);
Context.Watch(sub.Subscriber);
sub.Subscriber.Tell(ack);
Sender.Tell(ack); // need this for ASK operations.
}
catch (Exception ex)
{
_log.Error(ex, "Error while processing subscription {0}", sub);
sub.Subscriber.Tell(new MarketSubscribeNack(TickerSymbol, sub.Events, ex.Message));
}
});
CommandAsync <MarketUnsubscribe>(async unsub =>
{
try
{
var ack = await _marketEventSubscriptionManager.Unsubscribe(PersistenceId, unsub.Events, unsub.Subscriber);
// leave DeathWatch intact, in case actor is still subscribed to additional topics
unsub.Subscriber.Tell(ack);
Sender.Tell(ack); // need this for ASK operations.
}
catch (Exception ex)
{
_log.Error(ex, "Error while processing unsubscribe {0}", unsub);
unsub.Subscriber.Tell(new MarketUnsubscribeNack(TickerSymbol, unsub.Events, ex.Message));
}
});
CommandAsync <Terminated>(async t =>
{
try
{
var ack = await _marketEventSubscriptionManager.Unsubscribe(TickerSymbol, t.ActorRef);
}
catch (Exception ex)
{
_log.Error(ex, "Error while processing unsubscribe for terminated subscriber {0} for symbol {1}", t.ActorRef, TickerSymbol);
}
});
}
private void Commands()
{
Command <EventEnvelope>(e =>
{
if (e.Event is Match m)
{
// update the offset
if (e.Offset is Sequence s)
{
QueryOffset = s.Value;
}
if (_matchAggregate == null)
{
_matchAggregate = new MatchAggregate(TickerSymbol, m.SettlementPrice, m.Quantity);
return;
}
if (!_matchAggregate.WithMatch(m))
{
_log.Warning("Received Match for ticker symbol [{0}] - but we only accept symbols for [{1}]", m.StockId, TickerSymbol);
}
}
});
// Command sent by a PriceViewActor to pull down a complete snapshot of active pricing data
Command <FetchPriceAndVolume>(f =>
{
// no price data yet
if (_priceUpdates.Count == 0 || _volumeUpdates.Count == 0)
{
Sender.Tell(PriceAndVolumeSnapshot.Empty(TickerSymbol));
}
else
{
Sender.Tell(new PriceAndVolumeSnapshot(TickerSymbol, _priceUpdates.ToArray(), _volumeUpdates.ToArray()));
}
});
Command <PublishEvents>(p =>
{
if (_matchAggregate == null)
{
return;
}
var(latestPrice, latestVolume) = _matchAggregate.FetchMetrics(_timestamper);
// Need to update pricing records prior to persisting our state, since this data is included in
// output of SaveAggregateData()
_priceUpdates.Add(latestPrice);
_volumeUpdates.Add(latestVolume);
PersistAsync(SaveAggregateData(), snapshot =>
{
_log.Info("Saved latest price {0} and volume {1}", snapshot.AvgPrice, snapshot.AvgVolume);
if (LastSequenceNr % SnapshotEveryN == 0)
{
SaveSnapshot(snapshot);
}
});
// publish updates to in-memory replicas
_mediator.Tell(new Publish(_priceTopic, latestPrice));
_mediator.Tell(new Publish(_volumeTopic, latestVolume));
});
Command <Ping>(p =>
{
if (_log.IsDebugEnabled)
{
_log.Debug("pinged via {0}", Sender);
}
});
Command <SaveSnapshotSuccess>(s =>
{
// clean-up prior snapshots and journal events
DeleteSnapshots(new SnapshotSelectionCriteria(s.Metadata.SequenceNr - 1));
DeleteMessages(s.Metadata.SequenceNr);
});
}
