public IConsumerManager Create(IConsumerConfiguration configuration, IDependencyResolver resolver)
{
var logHandler = resolver.Resolve <ILogHandler>();
var middlewares = configuration.MiddlewareConfiguration.Factories
.Select(factory => factory(resolver))
.ToList();
var consumer = new Consumer(configuration, logHandler);
var consumerWorkerPool = new ConsumerWorkerPool(
consumer,
resolver,
logHandler,
new MiddlewareExecutor(middlewares),
configuration.DistributionStrategyFactory);
var feeder = new WorkerPoolFeeder(
consumer,
consumerWorkerPool,
logHandler);
var consumerManager = new ConsumerManager(
consumer,
consumerWorkerPool,
feeder,
logHandler);
return(consumerManager);
}
public IConsumerManager Create(IConsumerConfiguration configuration, IDependencyResolver resolver)
{
var logHandler = resolver.Resolve <ILogHandler>();
var consumer = configuration.CustomFactory(new Consumer(configuration, resolver, logHandler), resolver);
var consumerWorkerPool = new ConsumerWorkerPool(
consumer,
resolver,
new MiddlewareExecutor(configuration.MiddlewaresConfigurations),
configuration,
logHandler);
var feeder = new WorkerPoolFeeder(
consumer,
consumerWorkerPool,
logHandler);
var consumerManager = new ConsumerManager(
consumer,
consumerWorkerPool,
feeder,
logHandler);
return(consumerManager);
}
public ExclusiveConsumer(
IQueue queue,
Func<byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IPersistentConnection connection,
IConsumerConfiguration configuration,
IInternalConsumerFactory internalConsumerFactory,
IEventBus eventBus
)
{
Preconditions.CheckNotNull(queue, "queue");
Preconditions.CheckNotNull(onMessage, "onMessage");
Preconditions.CheckNotNull(connection, "connection");
Preconditions.CheckNotNull(internalConsumerFactory, "internalConsumerFactory");
Preconditions.CheckNotNull(eventBus, "eventBus");
Preconditions.CheckNotNull(configuration, "configuration");
this.queue = queue;
this.onMessage = onMessage;
this.connection = connection;
this.configuration = configuration;
this.internalConsumerFactory = internalConsumerFactory;
this.eventBus = eventBus;
timer = new Timer(s =>
{
StartConsumer();
((Timer)s).Change(10000, -1);
});
timer.Change(10000, -1);
}
public void SetUp()
{
eventBus = new EventBus();
internalConsumers = new List<IInternalConsumer>();
createConsumerCalled = 0;
mockBuilder = new MockBuilder();
queue = new Queue(queueName, false);
onMessage = (body, properties, info) => Task.Factory.StartNew(() => { });
persistentConnection = MockRepository.GenerateStub<IPersistentConnection>();
internalConsumerFactory = MockRepository.GenerateStub<IInternalConsumerFactory>();
internalConsumerFactory.Stub(x => x.CreateConsumer()).WhenCalled(x =>
{
var internalConsumer = MockRepository.GenerateStub<IInternalConsumer>();
internalConsumers.Add(internalConsumer);
createConsumerCalled++;
x.ReturnValue = internalConsumer;
}).Repeat.Any();
configuration = new ConsumerConfiguration(0);
consumer = new PersistentConsumer(
queue,
onMessage,
persistentConnection,
configuration,
internalConsumerFactory,
eventBus);
AdditionalSetup();
}
private void WireUpConsumer(IRawConsumer consumer, IConsumerConfiguration cfg)
{
consumer.OnMessageAsync = (o, args) =>
{
ResponseCompletionSource responseTcs = null;
return(_errorStrategy.ExecuteAsync(() =>
{
if (_responseDictionary.TryRemove(args.BasicProperties.CorrelationId, out responseTcs))
{
_logger.LogDebug($"Recived response with correlationId {args.BasicProperties.CorrelationId}.");
responseTcs.RequestTimer.Dispose();
_errorStrategy.OnResponseRecievedAsync(args, responseTcs);
if (responseTcs.Task.IsFaulted)
{
return _completed;
}
var response = _serializer.Deserialize(args);
responseTcs.TrySetResult(response);
return _completed;
}
_logger.LogWarning($"Unable to find callback for {args.BasicProperties.CorrelationId}.");
return _completed;
}, exception => _errorStrategy.OnResponseRecievedException(consumer, cfg, args, responseTcs, exception)));
};
}
public void SetUp()
{
eventBus = new EventBus();
internalConsumers = new List <IInternalConsumer>();
createConsumerCalled = 0;
mockBuilder = new MockBuilder();
queue = new Queue(queueName, false);
onMessage = (body, properties, info) => Task.Factory.StartNew(() => { });
persistentConnection = MockRepository.GenerateStub <IPersistentConnection>();
internalConsumerFactory = MockRepository.GenerateStub <IInternalConsumerFactory>();
internalConsumerFactory.Stub(x => x.CreateConsumer()).WhenCalled(x =>
{
var internalConsumer = MockRepository.GenerateStub <IInternalConsumer>();
internalConsumers.Add(internalConsumer);
createConsumerCalled++;
x.ReturnValue = internalConsumer;
}).Repeat.Any();
configuration = new ConsumerConfiguration();
consumer = new PersistentConsumer(
queue,
onMessage,
persistentConnection,
configuration,
internalConsumerFactory,
eventBus);
AdditionalSetup();
}
public QueueConsumer(IQueueConfiguration queueConfiguration,
IQueueConnectionFactory connectionFactory,
IJsonSerializer serializer,
IValidationHelper validationHelper,
string consumerName)
{
_queueConfiguration = queueConfiguration ?? throw new ArgumentNullException(nameof(queueConfiguration));
_connectionFactory = connectionFactory ?? throw new ArgumentNullException(nameof(connectionFactory));
_serializer = serializer ?? throw new ArgumentNullException(nameof(serializer));
_validationHelper = validationHelper ?? throw new ArgumentNullException(nameof(validationHelper));
if (string.IsNullOrEmpty(consumerName))
{
throw new ArgumentNullException(nameof(consumerName));
}
_consumerName = consumerName;
// verify that the queue configuration is valid
if (!queueConfiguration.IsValid)
{
throw new ArgumentException("Queue Configuration is not valid", nameof(queueConfiguration));
}
// retrieve the specific queues configuration
_consumerConfig = queueConfiguration.Consumers?.FirstOrDefault(c => c.Name == _consumerName);
if (_consumerConfig == null)
{
throw new ArgumentNullException(nameof(_consumerConfig));
}
this._performanceLoggingMethodName = $"{consumerName}.Run";
}
public virtual Task OnResponseHandlerExceptionAsync(IRawConsumer rawConsumer, IConsumerConfiguration cfg, BasicDeliverEventArgs args, Exception exception)
{
_logger.LogError($"An unhandled exception was thrown in the response handler for message '{args.BasicProperties.MessageId}'.", exception);
var innerException = UnwrapInnerException(exception);
var rawException = new MessageHandlerException(
message: $"An unhandled exception was thrown when consuming a message\n MessageId: {args.BasicProperties.MessageId}\n Queue: '{cfg.Queue.FullQueueName}'\n Exchange: '{cfg.Exchange.ExchangeName}'\nSee inner exception for more details.",
inner: innerException
);
_logger.LogInformation($"Sending MessageHandlerException with CorrelationId '{args.BasicProperties.CorrelationId}'");
rawConsumer.Model.BasicPublish(
exchange: string.Empty,
routingKey: args.BasicProperties?.ReplyTo ?? string.Empty,
basicProperties: _propertiesProvider.GetProperties<MessageHandlerException>(p =>
{
p.CorrelationId = args.BasicProperties?.CorrelationId ?? string.Empty;
p.Headers.Add(PropertyHeaders.ExceptionHeader, _messageExceptionName);
}),
body: _serializer.Serialize(rawException)
);
if (!cfg.NoAck)
{
_logger.LogDebug($"Nack'ing message with delivery tag '{args.DeliveryTag}'.");
rawConsumer.Model.BasicNack(args.DeliveryTag, false, false);
}
return Task.FromResult(true);
}
public ConsumerIntegrationTests()
{
_kafkaUri = TestConfig.IntegrationUri;
_config = new ConnectionConfiguration(TimeSpan.FromSeconds(10));
_options = new KafkaOptions(TestConfig.IntegrationUri, _config, log: TestConfig.InfoLog);
_consumerConfig = new ConsumerConfiguration(maxPartitionFetchBytes: DefaultMaxMessageSetSize);
}
public ExclusiveConsumer(
IQueue queue,
Func <byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IPersistentConnection connection,
IConsumerConfiguration configuration,
IInternalConsumerFactory internalConsumerFactory,
IEventBus eventBus
)
{
Preconditions.CheckNotNull(queue, "queue");
Preconditions.CheckNotNull(onMessage, "onMessage");
Preconditions.CheckNotNull(connection, "connection");
Preconditions.CheckNotNull(internalConsumerFactory, "internalConsumerFactory");
Preconditions.CheckNotNull(eventBus, "eventBus");
Preconditions.CheckNotNull(configuration, "configuration");
this.queue = queue;
this.onMessage = onMessage;
this.connection = connection;
this.configuration = configuration;
this.internalConsumerFactory = internalConsumerFactory;
this.eventBus = eventBus;
timer = new Timer(s =>
{
StartConsumer();
((Timer)s).Change(10000, -1);
});
timer.Change(10000, -1);
}
public Given_a_PersistentConsumer()
{
eventBus = new EventBus();
internalConsumers = new List <IInternalConsumer>();
createConsumerCalled = 0;
mockBuilder = new MockBuilder();
queue = new Queue(queueName, false);
onMessage = (body, properties, info) => Task.Factory.StartNew(() => { });
persistentConnection = Substitute.For <IPersistentConnection>();
internalConsumerFactory = Substitute.For <IInternalConsumerFactory>();
internalConsumerFactory.CreateConsumer().Returns(x =>
{
var internalConsumer = Substitute.For <IInternalConsumer>();
internalConsumers.Add(internalConsumer);
createConsumerCalled++;
return(internalConsumer);
});
configuration = new ConsumerConfiguration(0);
consumer = new PersistentConsumer(
queue,
onMessage,
persistentConnection,
configuration,
internalConsumerFactory,
eventBus);
AdditionalSetup();
}
public QueueConsumer(IQueueConfiguration queueConfiguration,
IQueueConnectionFactory connectionFactory,
IJsonSerializer serializer,
string consumerName,
CancellationToken cancellationToken)
{
_queueConfiguration = queueConfiguration ?? throw new ArgumentNullException(nameof(queueConfiguration));
_connectionFactory = connectionFactory ?? throw new ArgumentNullException(nameof(connectionFactory));
_consumerName = consumerName ?? throw new ArgumentNullException(nameof(consumerName));
_serializer = serializer ?? throw new ArgumentNullException(nameof(serializer));
if (cancellationToken == null)
{
throw new ArgumentNullException(nameof(cancellationToken));
}
_cancellationToken = cancellationToken;
// retrieve the specific queues configuration
_consumerConfig = queueConfiguration.Consumers?.FirstOrDefault(c => c.Name == _consumerName);
if (_consumerConfig == null)
{
throw new ArgumentNullException(nameof(_consumerConfig));
}
}
public IRawConsumer CreateConsumer(IConsumerConfiguration cfg, IModel channel)
{
ConfigureQos(channel, cfg.PrefetchCount);
var rawConsumer = new EventingRawConsumer(channel);
rawConsumer.Received += (sender, args) =>
{
Task.Run(() =>
{
if (_processedButNotAcked.Contains(args.BasicProperties.MessageId))
{
/*
* This instance of the consumer has allready handled this message,
* but something went wrong when 'ack'-ing the message, therefore
* and the message was resent.
*/
BasicAck(channel, args);
return;
}
_logger.LogInformation($"Message recived: MessageId: {args.BasicProperties.MessageId}");
rawConsumer
.OnMessageAsync(sender, args)
.ContinueWith(t =>
{
if (cfg.NoAck || rawConsumer.AcknowledgedTags.Contains(args.DeliveryTag))
{
return;
}
BasicAck(channel, args);
});
});
};
return(rawConsumer);
}
public IRawConsumer CreateConsumer(IConsumerConfiguration cfg, IModel channel)
{
ConfigureQos(channel, cfg.PrefetchCount);
var rawConsumer = new EventingRawConsumer(channel);
rawConsumer.Received += (sender, args) =>
{
Task.Run(() =>
{
if (_processedButNotAcked.Contains(args.BasicProperties.MessageId))
{
/*
This instance of the consumer has allready handled this message,
but something went wrong when 'ack'-ing the message, therefore
and the message was resent.
*/
BasicAck(channel, args);
return;
}
_logger.LogInformation($"Message recived: MessageId: {args.BasicProperties.MessageId}");
rawConsumer
.OnMessageAsync(sender, args)
.ContinueWith(t =>
{
if (cfg.NoAck || rawConsumer.AcknowledgedTags.Contains(args.DeliveryTag))
{
return;
}
BasicAck(channel, args);
});
});
};
return rawConsumer;
}
public EventsConsumer(ILogger <EventsConsumer> logger,
IConsumerConfiguration consumerConfiguration,
ILoggerFactory loggerFactory)
{
_logger = logger;
_consumerConfiguration = consumerConfiguration;
_loggerFactory = loggerFactory;
}
public Consumer(IBrokerRouter brokerRouter, IConsumerConfiguration configuration = null, bool leaveRouterOpen = true)
{
_stopToken = new CancellationTokenSource();
_brokerRouter = brokerRouter;
_leaveRouterOpen = leaveRouterOpen;
Configuration = configuration ?? new ConsumerConfiguration();
_localMessages = ImmutableList <Message> .Empty;
}
public TopicSubscriberScope CreateTopicSubscriberScope(IConsumerConfiguration configuration)
{
var consumer = new ConsumerBuilder <string, string>(configuration).Build();
consumer.Subscribe(configuration.SubscribedTopics);
return(new KafkaConsumerScope(consumer));
}
public StartConsumingStatus StartConsuming(
IPersistentConnection connection,
IQueue queue,
Func <byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IConsumerConfiguration configuration
)
{
Preconditions.CheckNotNull(connection, "connection");
Preconditions.CheckNotNull(queue, "queue");
Preconditions.CheckNotNull(onMessage, "onMessage");
Preconditions.CheckNotNull(configuration, "configuration");
var consumerTag = conventions.ConsumerTagConvention();
IDictionary <string, object> arguments = new Dictionary <string, object>
{
{ "x-priority", configuration.Priority }
};
try
{
Model = connection.CreateModel();
var basicConsumer = new BasicConsumer(SingleBasicConsumerCancelled, consumerDispatcher, queue, eventBus, handlerRunner, onMessage, Model);
basicConsumers = new[] { basicConsumer };
Model.BasicQos(0, configuration.PrefetchCount, false);
Model.BasicConsume(
queue.Name, // queue
false, // noAck
consumerTag, // consumerTag
true,
configuration.IsExclusive,
arguments, // arguments
basicConsumer); // consumer
logger.InfoFormat(
"Declared consumer with consumerTag {consumerTag} on queue {queue} and configuration {configuration}",
consumerTag,
queue.Name,
configuration
);
return(StartConsumingStatus.Succeed);
}
catch (Exception exception)
{
logger.Error(
exception,
"Consume with consumerTag {consumerTag} from queue {queue} has failed",
consumerTag,
queue.Name
);
return(StartConsumingStatus.Failed);
}
}
private PactBuilder(string description, IConsumerConfiguration config)
{
if (string.IsNullOrWhiteSpace(description))
{
throw new ArgumentException("Please provide a description", nameof(description));
}
this._description = description;
_configuration = MergedConfiguration.MergeConfigs(Context.Configuration, config);
}
public Consumer(IEnumerable <TopicPartition> partitions, IRouter router, IConsumerConfiguration configuration = null, bool?leaveRouterOpen = null, bool?autoConsume = null)
{
Router = router;
_topicPartitions = ImmutableList <TopicPartition> .Empty.AddNotNullRange(partitions);
_leaveRouterOpen = leaveRouterOpen.GetValueOrDefault(true);
AutoConsume = autoConsume.GetValueOrDefault(true);
Configuration = configuration ?? ConsumerConfiguration.Default;
}
public IRawConsumer CreateConsumer(IConsumerConfiguration cfg, IModel channel)
{
ConfigureQos(channel, cfg.PrefetchCount);
var rawConsumer = new EventingRawConsumer(channel);
_consumers.Add(rawConsumer);
rawConsumer.Received += (sender, args) =>
{
if (_processedButNotAcked.Contains(args.BasicProperties.MessageId))
{
/*
This instance of the consumer has allready handled this message,
but something went wrong when 'ack'-ing the message, therefore
and the message was resent.
*/
BasicAck(channel, args, cfg);
return;
}
Task onMessageTask;
try
{
_logger.LogInformation($"Message recived: MessageId: {args.BasicProperties.MessageId}");
onMessageTask = rawConsumer.OnMessageAsync(sender, args);
}
catch (Exception)
{
/*
The message handler threw an exception. It is time to hand over the
message handling to an error strategy instead.
*/
if (!cfg.NoAck || rawConsumer.NackedDeliveryTags.Contains(args.DeliveryTag))
{
BasicAck(channel, args, cfg); // TODO: employ error handling strategy instead
}
return;
}
onMessageTask
.ContinueWith(t =>
{
if (cfg.NoAck || rawConsumer.NackedDeliveryTags.Contains(args.DeliveryTag))
{
/*
The consumer has stated that 'ack'-ing is not required, so
now that the message is handled, the consumer is done.
*/
return;
}
BasicAck(channel, args, cfg);
});
};
return rawConsumer;
}
public IRawConsumer CreateConsumer(IConsumerConfiguration cfg, IModel channel)
{
ConfigureQos(channel, cfg.PrefetchCount);
var rawConsumer = new EventingRawConsumer(channel);
_consumers.Add(rawConsumer);
rawConsumer.Received += (sender, args) =>
{
Task.Run(() =>
{
if (_processedButNotAcked.Contains(args.BasicProperties.MessageId))
{
/*
This instance of the consumer has allready handled this message,
but something went wrong when 'ack'-ing the message, therefore
and the message was resent.
*/
BasicAck(channel, args, cfg);
return;
}
_logger.LogInformation($"Message recived: MessageId: {args.BasicProperties.MessageId}");
try
{
rawConsumer
.OnMessageAsync(sender, args)
.ContinueWith(t =>
{
if (t.IsFaulted)
{
_logger.LogError($"An unhandled exception was caught for message {args.BasicProperties.MessageId}.\n", t.Exception);
_strategy.OnRequestHandlerExceptionAsync(rawConsumer, cfg, args, t.Exception);
return;
}
if (cfg.NoAck || rawConsumer.NackedDeliveryTags.Contains(args.DeliveryTag))
{
/*
The consumer has stated that 'ack'-ing is not required, so
now that the message is handled, the consumer is done.
*/
return;
}
BasicAck(channel, args, cfg);
});
}
catch (Exception e)
{
_logger.LogError($"An unhandled exception was caught for message {args.BasicProperties.MessageId}.\n", e);
_strategy.OnRequestHandlerExceptionAsync(rawConsumer, cfg, args, e);
}
});
};
return rawConsumer;
}
public KafkaOptions(Uri kafkaServerUri = null,
IConnectionConfiguration connectionConfiguration = null,
IRouterConfiguration routerConfiguration = null,
IConnectionFactory connectionFactory = null,
IProducerConfiguration producerConfiguration = null,
IConsumerConfiguration consumerConfiguration = null,
ILog log = null)
: this(ImmutableList <Uri> .Empty.AddNotNull(kafkaServerUri), connectionConfiguration, routerConfiguration, connectionFactory, producerConfiguration, consumerConfiguration, log)
{
}
public PactHandler(
IPactInteractionDefinition pact,
IConsumerConfiguration config,
Action <PactHandler> unregister)
{
this.matcher = new PactComparer(pact, config);
this.pact = pact;
Configuration = config;
this.unregister = () => unregister(this);
}
/// <summary>
/// Merges two configurations, letting <paramref name="right"/> override <paramref name="left"/>.
/// </summary>
/// <param name="left">The original config. May be <c>null</c>.</param>
/// <param name="right">The overriding config. May be <c>null</c>.</param>
/// <returns>If any parameter is null, the method may return the other parameter. Otherwise a merged configuration object.</returns>
public static IConsumerConfiguration MergeConfigs(IConsumerConfiguration left, IConsumerConfiguration right)
{
if (left == null)
{
return(right);
}
else
{
return(right == null ? left : new MergedConfiguration(left, right));
}
}
public IConsumer CreateConsumer(
IQueue queue,
Func <byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IPersistentConnection connection,
IConsumerConfiguration configuration)
{
var consumer = CreateConsumerInstance(queue, onMessage, connection, configuration);
consumers.TryAdd(consumer, null);
return(consumer);
}
private void InitIConsumerConfiguration(IConsumerConfiguration consumerConfigure)
{
consumerConfigure
.WithPriority(subConfigure.Priority)
.WithCancelOnHaFailover(subConfigure.CancelOnHaFailover)
.WithPrefetchCount(subConfigure.PrefetchCount);
if (subConfigure.IsExclusive)
{
consumerConfigure.AsExclusive();
}
}
public KafkaOptions(
Uri kafkaServerUri = null,
IConnectionConfiguration connectionConfiguration = null,
ICacheConfiguration cacheConfiguration = null,
IConnectionFactory connectionFactory = null,
IPartitionSelector partitionSelector = null,
IProducerConfiguration producerConfiguration = null,
IConsumerConfiguration consumerConfiguration = null,
ILog log = null)
: this(ImmutableList <Uri> .Empty.AddNotNull(kafkaServerUri), connectionConfiguration, cacheConfiguration, connectionFactory, partitionSelector, producerConfiguration, consumerConfiguration, log)
{
}
public IConsumer CreateConsumer(
ICollection <Tuple <IQueue, Func <byte[], MessageProperties, MessageReceivedInfo, Task> > > queueConsumerPairs,
IPersistentConnection connection,
IConsumerConfiguration configuration)
{
if (configuration.IsExclusive || queueConsumerPairs.Any(x => x.Item1.IsExclusive))
{
throw new NotSupportedException("Exclusive multiple consuming is not supported.");
}
return(new PersistentMultipleConsumer(queueConsumerPairs, connection, configuration, internalConsumerFactory, eventBus));
}
public StartConsumingStatus StartConsuming(
IPersistentConnection connection,
IQueue queue,
Func <byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IConsumerConfiguration configuration
)
{
Preconditions.CheckNotNull(connection, "connection");
Preconditions.CheckNotNull(queue, "queue");
Preconditions.CheckNotNull(onMessage, "onMessage");
Preconditions.CheckNotNull(configuration, "configuration");
var consumerTag = conventions.ConsumerTagConvention();
IDictionary <string, object> arguments = new Dictionary <string, object>
{
{ "x-priority", configuration.Priority },
{ "x-cancel-on-ha-failover", configuration.CancelOnHaFailover || connectionConfiguration.CancelOnHaFailover }
};
try
{
Model = connection.CreateModel();
var basicConsumers = new BasicConsumer(SingleBasicConsumerCancelled, consumerDispatcher, queue, eventBus, handlerRunner, onMessage, logger, Model);
this.basicConsumers = new[] { new BasicConsumer(SingleBasicConsumerCancelled, consumerDispatcher, queue, eventBus, handlerRunner, onMessage, logger, Model) };
Model.BasicQos(0, configuration.PrefetchCount, false);
//// if configured, re-establish the consumer on a ConsumerCancelled event.
//if (queue.IsConsumerRepairable)
// ConsumerCancelled += (sender, args) => ConsumerReConnect(sender, consumerTag, configuration.IsExclusive, arguments,queue);
Model.BasicConsume(
queue.Name, // queue
false, // noAck
consumerTag, // consumerTag
true,
configuration.IsExclusive,
arguments, // arguments
basicConsumers); // consumer
logger.InfoWrite("Declared Consumer. queue='{0}', consumer tag='{1}' prefetchcount={2} priority={3} x-cancel-on-ha-failover={4}",
queue.Name, consumerTag, configuration.PrefetchCount, configuration.Priority, configuration.CancelOnHaFailover);
}
catch (Exception exception)
{
logger.ErrorWrite("Consume failed. queue='{0}', consumer tag='{1}', message='{2}'",
queue.Name, consumerTag, exception.Message);
return(StartConsumingStatus.Failed);
}
return(StartConsumingStatus.Succeed);
}
/// <summary>
/// Create the correct implementation of IConsumer based on queue properties
/// </summary>
/// <param name="queue"></param>
/// <param name="onMessage"></param>
/// <param name="connection"></param>
/// <param name="configuration"></param>
/// <returns></returns>
private IConsumer CreateConsumerInstance(
IQueue queue,
Func<byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IPersistentConnection connection,
IConsumerConfiguration configuration)
{
if (queue.IsExclusive)
{
return new TransientConsumer(queue, onMessage, connection, configuration, internalConsumerFactory, eventBus);
}
return new PersistentConsumer(queue, onMessage, connection, configuration, internalConsumerFactory, eventBus);
}
/// <summary>
/// Create the correct implementation of IConsumer based on queue properties
/// </summary>
/// <param name="queue"></param>
/// <param name="onMessage"></param>
/// <param name="connection"></param>
/// <param name="configuration"></param>
/// <returns></returns>
private IConsumer CreateConsumerInstance(
IQueue queue,
Func <byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IPersistentConnection connection,
IConsumerConfiguration configuration)
{
if (queue.IsExclusive)
{
return(new TransientConsumer(queue, onMessage, connection, configuration, internalConsumerFactory, eventBus));
}
return(new PersistentConsumer(queue, onMessage, connection, configuration, internalConsumerFactory, eventBus));
}
public IRawConsumer CreateConsumer(IConsumerConfiguration cfg, IModel channel)
{
ConfigureQos(channel, cfg.PrefetchCount);
var consumer = new QueueingRawConsumer(channel);
_consumers.Add(consumer);
//TODO: Add exception handling etc.
Task
.Run(() => consumer.Queue.Dequeue())
.ContinueWith(argsTask => consumer.OnMessageAsync(this, argsTask.Result));
return consumer;
}
public StartConsumingStatus StartConsuming(
IPersistentConnection connection,
IQueue queue,
Func <byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IConsumerConfiguration configuration
)
{
Preconditions.CheckNotNull(connection, "connection");
Preconditions.CheckNotNull(queue, "queue");
Preconditions.CheckNotNull(onMessage, "onMessage");
Preconditions.CheckNotNull(configuration, "configuration");
this.queue = queue;
this.onMessage = onMessage;
this.configuration = configuration;
var consumerTag = conventions.ConsumerTagConvention();
IDictionary <string, object> arguments = new Dictionary <string, object>
{
{ "x-priority", configuration.Priority },
{ "x-cancel-on-ha-failover", configuration.CancelOnHaFailover || connectionConfiguration.CancelOnHaFailover }
};
try
{
Model = connection.CreateModel();
Model.BasicQos(0, configuration.PrefetchCount, false);
Model.BasicConsume(
queue.Name, // queue
false, // noAck
consumerTag, // consumerTag
true,
configuration.IsExclusive,
arguments, // arguments
this); // consumer
logger.InfoWrite("Declared Consumer. queue='{0}', consumer tag='{1}' prefetchcount={2} priority={3} x-cancel-on-ha-failover={4}",
queue.Name, consumerTag, configuration.PrefetchCount, configuration.Priority, configuration.CancelOnHaFailover);
}
catch (Exception exception)
{
logger.ErrorWrite("Consume failed. queue='{0}', consumer tag='{1}', message='{2}'",
queue.Name, consumerTag, exception.Message);
return(StartConsumingStatus.Failed);
}
return(StartConsumingStatus.Succeed);
}
public IConsumer CreateConsumer(
IQueue queue,
Func<byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IPersistentConnection connection,
IConsumerConfiguration configuration
)
{
Preconditions.CheckNotNull(queue, "queue");
Preconditions.CheckNotNull(onMessage, "onMessage");
Preconditions.CheckNotNull(connection, "connection");
var consumer = CreateConsumerInstance(queue, onMessage, connection, configuration);
consumers.TryAdd(consumer, null);
return consumer;
}
public TransientConsumer(
IQueue queue,
Func <byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IPersistentConnection connection,
IConsumerConfiguration configuration,
IInternalConsumerFactory internalConsumerFactory,
IEventBus eventBus)
{
this.queue = queue;
this.onMessage = onMessage;
this.connection = connection;
this.configuration = configuration;
this.internalConsumerFactory = internalConsumerFactory;
this.eventBus = eventBus;
}
/// <summary>
/// Create a new instance of the shared context.
/// </summary>
/// <param name="configuration">A configuration that may be overridden by the individual interactions. This may be null.</param>
public Context(IConsumerConfiguration configuration)
{
if (_instance != null)
{
throw new InvalidOperationException("Dispose the old context before creating a new.");
}
_instance = this;
_configuration = configuration;
lock (_lockToken)
{
if (_servers == null)
{
_servers = new WebServerContainer(configuration, false);
}
}
}
public StartConsumingStatus StartConsuming(
IPersistentConnection connection,
IQueue queue,
Func<byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IConsumerConfiguration configuration
)
{
Preconditions.CheckNotNull(connection, "connection");
Preconditions.CheckNotNull(queue, "queue");
Preconditions.CheckNotNull(onMessage, "onMessage");
Preconditions.CheckNotNull(configuration, "configuration");
this.queue = queue;
this.onMessage = onMessage;
var consumerTag = conventions.ConsumerTagConvention();
IDictionary<string, object> arguments = new Dictionary<string, object>
{
{"x-priority", configuration.Priority},
{"x-cancel-on-ha-failover", configuration.CancelOnHaFailover || connectionConfiguration.CancelOnHaFailover}
};
try
{
Model = connection.CreateModel();
Model.BasicQos(0, configuration.PrefetchCount, false);
Model.BasicConsume(
queue.Name, // queue
false, // noAck
consumerTag, // consumerTag
true,
configuration.IsExclusive,
arguments, // arguments
this); // consumer
logger.InfoWrite("Declared Consumer. queue='{0}', consumer tag='{1}' prefetchcount={2} priority={3} x-cancel-on-ha-failover={4}",
queue.Name, consumerTag, configuration.PrefetchCount, configuration.Priority, configuration.CancelOnHaFailover);
}
catch (Exception exception)
{
logger.ErrorWrite("Consume failed. queue='{0}', consumer tag='{1}', message='{2}'",
queue.Name, consumerTag, exception.Message);
return StartConsumingStatus.Failed;
}
return StartConsumingStatus.Succeed;
}
public KafkaOptions(IEnumerable <Uri> kafkaServerUris = null,
IConnectionConfiguration connectionConfiguration = null,
IRouterConfiguration routerConfiguration = null,
IConnectionFactory connectionFactory = null,
IProducerConfiguration producerConfiguration = null,
IConsumerConfiguration consumerConfiguration = null,
ILog log = null)
{
ServerUris = ImmutableList <Uri> .Empty.AddNotNullRange(kafkaServerUris);
RouterConfiguration = routerConfiguration ?? KafkaClient.RouterConfiguration.Default;
ConnectionConfiguration = connectionConfiguration ?? Connections.ConnectionConfiguration.Default;
ConnectionFactory = connectionFactory ?? new ConnectionFactory();
ProducerConfiguration = producerConfiguration ?? KafkaClient.ProducerConfiguration.Default;
ConsumerConfiguration = consumerConfiguration ?? KafkaClient.ConsumerConfiguration.Default;
Log = log ?? TraceLog.Log;
}
public TransientConsumer(
IQueue queue,
Func<byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IPersistentConnection connection,
IConsumerConfiguration configuration,
IInternalConsumerFactory internalConsumerFactory,
IEventBus eventBus)
{
Preconditions.CheckNotNull(queue, "queue");
Preconditions.CheckNotNull(onMessage, "onMessage");
Preconditions.CheckNotNull(connection, "connection");
Preconditions.CheckNotNull(internalConsumerFactory, "internalConsumerFactory");
Preconditions.CheckNotNull(eventBus, "eventBus");
Preconditions.CheckNotNull(configuration, "configuration");
this.queue = queue;
this.onMessage = onMessage;
this.connection = connection;
this.configuration = configuration;
this.internalConsumerFactory = internalConsumerFactory;
this.eventBus = eventBus;
}
protected void BasicAck(IModel channel, BasicDeliverEventArgs args, IConsumerConfiguration cfg)
{
try
{
_logger.LogDebug($"Ack:ing message with id {args.DeliveryTag}.");
channel.BasicAck(
deliveryTag: args.DeliveryTag,
multiple: false
);
}
catch (AlreadyClosedException)
{
_logger.LogWarning("Unable to ack message, channel is allready closed.");
_processedButNotAcked.Add(args.BasicProperties.MessageId);
}
}
public IRawConsumer CreateConsumer(IConsumerConfiguration cfg)
{
return CreateConsumer(cfg, _channelFactory.GetChannel());
}
public void StartConsuming(
IPersistentConnection connection,
IQueue queue,
Func<byte[], MessageProperties, MessageReceivedInfo, Task> onMessage,
IConsumerConfiguration configuration
)
{
Preconditions.CheckNotNull(connection, "connection");
Preconditions.CheckNotNull(queue, "queue");
Preconditions.CheckNotNull(onMessage, "onMessage");
Preconditions.CheckNotNull(configuration, "configuration");
this.queue = queue;
this.onMessage = onMessage;
var consumerTag = conventions.ConsumerTagConvention();
IDictionary<string, object> arguments = new Dictionary<string, object>
{
{"x-priority", configuration.Priority}
};
try
{
Model = connection.CreateModel();
Model.BasicQos(0, connectionConfiguration.PrefetchCount, false);
Model.BasicConsume(
queue.Name, // queue
false, // noAck
consumerTag, // consumerTag
arguments, // arguments
this); // consumer
logger.InfoWrite("Declared Consumer. queue='{0}', consumer tag='{1}' prefetchcount={2} priority={3}",
queue.Name, consumerTag, connectionConfiguration.PrefetchCount, configuration.Priority);
}
catch (Exception exception)
{
logger.InfoWrite("Consume failed. queue='{0}', consumer tag='{1}', message='{2}'",
queue.Name, consumerTag, exception.Message);
}
}
public virtual Task OnResponseRecievedException(IRawConsumer rawConsumer, IConsumerConfiguration cfg, BasicDeliverEventArgs args, TaskCompletionSource<object> responseTcs, Exception exception)
{
_logger.LogError($"An exception was thrown when recieving response to messaeg '{args.BasicProperties.MessageId}' with CorrelationId '{args.BasicProperties.CorrelationId}'.", exception);
responseTcs.TrySetException(exception);
return Task.FromResult(true);
}