public async Task <ISet <PubSubSubscriptionState> > RegisterProducer(StreamId streamId, IStreamProducerExtension streamProducer)
{
counterProducersAdded.Increment();
if (!IsActiveProducer(streamProducer))
{
throw new ArgumentException($"Trying to register non active IStreamProducerExtension: {streamProducer}", "streamProducer");
}
try
{
int producersRemoved = RemoveDeadProducers();
var publisherState = new PubSubPublisherState(streamId, streamProducer);
State.Producers.Add(publisherState);
LogPubSubCounts("RegisterProducer {0}", streamProducer);
await WriteStateAsync();
counterProducersTotal.DecrementBy(producersRemoved);
counterProducersTotal.Increment();
}
catch (Exception exc)
{
logger.Error(ErrorCode.Stream_RegisterProducerFailed, $"Failed to register a stream producer. Stream: {streamId}, Producer: {streamProducer}", exc);
// Corrupted state, deactivate grain.
DeactivateOnIdle();
throw;
}
return(State.Consumers.Where(c => !c.IsFaulted).ToSet());
}
private int RemoveDeadProducers()
{
// Remove only those we know for sure are Dead.
int numRemoved = 0;
if (State.Producers != null && State.Producers.Count > 0)
numRemoved = State.Producers.RemoveWhere(producerState => IsDeadProducer(producerState.Producer));
if (numRemoved > 0)
{
LogPubSubCounts("RemoveDeadProducers: removed {0} outdated producers", numRemoved);
counterProducersRemoved.Increment();
counterProducersTotal.DecrementBy(numRemoved);
}
return numRemoved;
}
public async Task UnregisterProducer(StreamId streamId, IStreamProducerExtension streamProducer)
{
counterProducersRemoved.Increment();
try
{
int numRemoved = State.Producers.RemoveWhere(s => s.Equals(streamId, streamProducer));
LogPubSubCounts("UnregisterProducer {0} NumRemoved={1}", streamProducer, numRemoved);
if (numRemoved > 0)
{
Task updateStorageTask = State.Producers.Count == 0 && State.Consumers.Count == 0
? ClearStateAsync() //State contains no producers or consumers, remove it from storage
: WriteStateAsync();
await updateStorageTask;
}
counterProducersTotal.DecrementBy(numRemoved);
}
catch (Exception exc)
{
logger.Error(ErrorCode.Stream_UnegisterProducerFailed,
$"Failed to unregister a stream producer. Stream: {streamId}, Producer: {streamProducer}", exc);
// Corrupted state, deactivate grain.
DeactivateOnIdle();
throw;
}
if (State.Producers.Count == 0 && State.Consumers.Count == 0)
{
DeactivateOnIdle(); // No producers or consumers left now, so flag ourselves to expedite Deactivation
}
}
public async Task UnregisterConsumer(StreamId streamId, IStreamConsumerExtension streamConsumer)
{
int numRemoved = State.Consumers.RemoveWhere(c => c.Equals(streamId, streamConsumer));
counterConsumersRemoved.Increment();
counterConsumersTotal.DecrementBy(numRemoved);
LogPubSubCounts("UnregisterConsumer {0} NumRemoved={1}", streamConsumer, numRemoved);
await State.WriteStateAsync();
int numProducers = State.Producers.Count;
if (numProducers > 0)
{
if (logger.IsVerbose) logger.Verbose("Notifying {0} existing producers about unregistered consumer.", numProducers);
// Notify producers about unregistered consumer.
var tasks = new List<Task>();
foreach (var producerState in State.Producers
.Where(producerState => IsActiveProducer(producerState.Producer)))
tasks.Add(producerState.Producer.RemoveSubscriber(streamId, streamConsumer));
await Task.WhenAll(tasks);
}
else if (State.Consumers.Count == 0) // + we already know that numProducers == 0 from previous if-clause
{
// No producers or consumers left now, so flag ourselves to expedite Deactivation
DeactivateOnIdle();
}
}
public void Counter_DecrementBy()
{
StatisticName name = new StatisticName(CounterName);
int startValue = 10;
int newValue = startValue - 1;
CounterStatistic ctr = CounterStatistic.FindOrCreate(name);
ctr.IncrementBy(startValue);
Assert.Equal(startValue, ctr.GetCurrentValue());
ctr.DecrementBy(1);
Assert.Equal(newValue, ctr.GetCurrentValue());
}
public async Task UnregisterConsumer(GuidId subscriptionId, StreamId streamId)
{
if (State.Consumers.Any(c => c.IsFaulted && c.Equals(subscriptionId)))
{
throw new FaultedSubscriptionException(subscriptionId, streamId);
}
int numRemoved = State.Consumers.RemoveWhere(c => c.Equals(subscriptionId));
counterConsumersRemoved.Increment();
counterConsumersTotal.DecrementBy(numRemoved);
LogPubSubCounts("UnregisterSubscription {0} NumRemoved={1}", subscriptionId, numRemoved);
await WriteStateAsync();
await NotifyProducersOfRemovedSubscription(subscriptionId, streamId);
await ClearStateWhenEmpty();
}
public async Task RegisterConsumer(
GuidId subscriptionId,
StreamId streamId,
IStreamConsumerExtension streamConsumer,
IStreamFilterPredicateWrapper filter)
{
counterConsumersAdded.Increment();
PubSubSubscriptionState pubSubState = State.Consumers.FirstOrDefault(s => s.Equals(subscriptionId));
if (pubSubState != null && pubSubState.IsFaulted)
{
throw new FaultedSubscriptionException(subscriptionId, streamId);
}
try
{
if (pubSubState == null)
{
pubSubState = new PubSubSubscriptionState(subscriptionId, streamId, streamConsumer);
State.Consumers.Add(pubSubState);
}
if (filter != null)
{
pubSubState.AddFilter(filter);
}
LogPubSubCounts("RegisterConsumer {0}", streamConsumer);
await WriteStateAsync();
counterConsumersTotal.Increment();
}
catch (Exception exc)
{
logger.Error(ErrorCode.Stream_RegisterConsumerFailed,
$"Failed to register a stream consumer. Stream: {streamId}, SubscriptionId {subscriptionId}, Consumer: {streamConsumer}", exc);
// Corrupted state, deactivate grain.
DeactivateOnIdle();
throw;
}
int numProducers = State.Producers.Count;
if (numProducers <= 0)
{
return;
}
if (logger.IsEnabled(LogLevel.Debug))
{
logger.Debug("Notifying {0} existing producer(s) about new consumer {1}. Producers={2}",
numProducers, streamConsumer, Utils.EnumerableToString(State.Producers));
}
// Notify producers about a new streamConsumer.
var tasks = new List <Task>();
var producers = State.Producers.ToList();
int initialProducerCount = producers.Count;
try
{
foreach (PubSubPublisherState producerState in producers)
{
tasks.Add(ExecuteProducerTask(producerState, producerState.Producer.AddSubscriber(subscriptionId, streamId, streamConsumer, filter)));
}
Exception exception = null;
try
{
await Task.WhenAll(tasks);
}
catch (Exception exc)
{
exception = exc;
}
// if the number of producers has been changed, resave state.
if (State.Producers.Count != initialProducerCount)
{
await WriteStateAsync();
counterConsumersTotal.DecrementBy(initialProducerCount - State.Producers.Count);
}
if (exception != null)
{
throw exception;
}
}
catch (Exception exc)
{
logger.Error(ErrorCode.Stream_RegisterConsumerFailed,
$"Failed to update producers while register a stream consumer. Stream: {streamId}, SubscriptionId {subscriptionId}, Consumer: {streamConsumer}", exc);
// Corrupted state, deactivate grain.
DeactivateOnIdle();
throw;
}
}
internal static void OnTransactionCommitted()
{
CommitTransactionQueueLength.DecrementBy(1);
CommitTransactionCompleted.Increment();
}
internal static void OnTransactionStarted()
{
StartTransactionQueueLength.DecrementBy(1);
StartTransactionCompleted.Increment();
}