public CancellationTokenSource Start(SubscriptionInfo subscriptionInfo, Action<Message> messageHandler)
{
subscriptionInfo.Requires("subscriptionInfo").IsNotNull();
var source = new CancellationTokenSource();
Task.Factory.StartNew(o =>
{
while (!source.Token.IsCancellationRequested)
{
foreach (var message in amazonFacade.ReadQueue(subscriptionInfo.Subscriber.QueueUrl))
{
if (messageHandler != null && subscriptionInfo.IsSubscribed)
{
messageHandler(message);
}
amazonFacade.DeleteMessage(subscriptionInfo.Subscriber.QueueUrl,
message.ReceiptHandle);
}
}
}, source.Token, source.Token);
return source;
}
private SubscriptionInfo UpdateSubscription(SubscriptionInfo subscriptionInfo, Action<Message> messageHandler)
{
if (subscriptionInfo.IsSubscribed)
{
return subscriptionInfo;
}
subscriptionInfo.SubscriptionArn =
amazonSnsFacade.SubscribeQueueToTopic(subscriptionInfo.Subscriber.QueueArn,
subscriptionInfo.Topic.TopicArn);
subscriptionInfo.CancelToken = queuePoller.Start(subscriptionInfo, messageHandler);
return subscriptionInfo;
}
private SubscriptionInfo AddSubscription(Topic topic, Subscriber subscriber, Action<Message> messageHandler)
{
var subscriptionInfo = new SubscriptionInfo
{
Topic = topic,
Subscriber = subscriber
};
amazonSqsFacade.SetSqsPolicyForSnsPublish(subscriber.QueueUrl, subscriber.QueueArn, topic.TopicArn);
subscriptionInfo.SubscriptionArn =
amazonSnsFacade.SubscribeQueueToTopic(subscriptionInfo.Subscriber.QueueArn,
subscriptionInfo.Topic.TopicArn);
if (subscriptionInfo.Subscriber.LongLived)
{
resourceCounter.Increment(subscriptionInfo.Subscriber.Name);
}
subscriptionInfo.CancelToken = queuePoller.Start(subscriptionInfo, messageHandler);
return subscriptionInfo;
}
