public void LinkSubscriber(Session session, HostItemSubscriber subscriber,
ISubscriptionSettings subscriptionSettings)
{
var topicAttribute = (TopicAttribute)subscriber.HostItemAttribute;
// Determine if the host application has provided a specific subscription
// that should be used for the name specified in code.
string hostName = subscriber.HostAttribute.HostName;
var mapping = new SubscriptionMapping(hostName, topicAttribute.TopicName,
topicAttribute.SubscriptionName);
string subscriptionName = subscriptionSettings.GetMappedSubscription(mapping)
?? topicAttribute.SubscriptionName;
var logger = LoggerFactory.CreateLogger <TopicSubscriberLinker>();
logger.LogInformation(
"Subscribing to topic {topicName} as subscription {subscriptionName}",
topicAttribute.TopicName,
subscriptionName);
// Create a AMQP receiver link used to register handler method:
var receiverLink = new ReceiverLink(session, Guid.NewGuid().ToString(),
$"{topicAttribute.TopicName}/Subscriptions/{subscriptionName}");
ReceiveMessages(subscriber, receiverLink);
}
public void LinkSubscriber(Session session, HostItemSubscriber subscriber,
ISubscriptionSettings subscriptionSettings)
{
var queueAttribute = (QueueAttribute)subscriber.HostItemAttribute;
// Create a AMQP receiver link used to register handler method:
var receiverLink = new ReceiverLink(session,
Guid.NewGuid().ToString(),
queueAttribute.QueueName);
var logger = LoggerFactory.CreateLogger <QueueSubscriberLinker>();
logger.LogInformation("Subscribing to queue {named}", queueAttribute.QueueName);
ReceiveMessages(subscriber, receiverLink);
}
private void InvokeHandler(
IReceiverLink receiverLink,
Message amqpMessage,
IMessage message,
HostItemSubscriber subscriber)
{
try
{
DispatchModule.InvokeDispatcherInNewLifetimeScopeAsync(
subscriber.DispatchInfo,
message).GetAwaiter().GetResult();
receiverLink.Accept(amqpMessage);
}
catch (Exception ex)
{
LogMessageReceiveEx(ex, message, subscriber.DispatchInfo);
receiverLink.Reject(amqpMessage);
}
}
protected void ReceiveMessages(HostItemSubscriber subscriber, IReceiverLink receiverLink)
{
subscriber.SetReceiverLink(receiverLink);
receiverLink.Closed += (sender, error) => { LogItemClosed(error); };
// Start message pump that will be called when a message
// is published to the host item.
receiverLink.Start(subscriber.HostItemAttribute.LinkCredit, (receiver, amqpMessage) =>
{
// Deserialize the message body into the the .NET types associated
// with the handler to which the message should be dispatched.
Type messageType = subscriber.DispatchInfo.MessageType;
IMessage message = DeserializeMessage(amqpMessage, messageType);
SetMessageApplicationProperties(amqpMessage, message);
// Invoke the handler associated with the message.
InvokeHandler(receiver, amqpMessage, message, subscriber);
});
}
