protected virtual string DefaultSubscriptionIdGenerator(AutoSubscriberConsumerInfo c)
{
var r = new StringBuilder();
var unique = string.Concat(SubscriptionIdPrefix, ":", c.ConcreteType.FullName, ":", c.MessageType.FullName);
using (var md5 = MD5.Create())
{
var buff = md5.ComputeHash(Encoding.UTF8.GetBytes(unique));
foreach (var b in buff)
r.Append(b.ToString("x2"));
}
return string.Concat(SubscriptionIdPrefix, ":", r.ToString());
}
private Action<ISubscriptionConfiguration> AutoSubscriberConsumerInfo(AutoSubscriberConsumerInfo subscriptionInfo)
{
var configSettings = GetSubscriptionConfigurationAttributeValue(subscriptionInfo);
if(configSettings == null)
{
return subscriptionConfiguration => {};
}
return configuration =>
{
//prefetch count is set to a configurable default in RabbitAdvancedBus
//so don't touch it unless SubscriptionConfigurationAttribute value is other than 0.
if(configSettings.PrefetchCount > 0)
{
configuration.WithPrefetchCount(configSettings.PrefetchCount);
}
configuration.WithAutoDelete(configSettings.AutoDelete)
.WithCancelOnHaFailover(configSettings.CancelOnHaFailover)
.WithExpires(configSettings.Expires)
.WithPrefetchCount(configSettings.PrefetchCount)
.WithPriority(configSettings.Priority);
};
}
private IEnumerable<string> GetTopAttributeValues(AutoSubscriberConsumerInfo subscriptionInfo)
{
var consumeMethod = ConsumeMethod(subscriptionInfo);
object[] customAttributes = consumeMethod.GetCustomAttributes(typeof(ForTopicAttribute), true);
return customAttributes
.OfType<ForTopicAttribute>()
.Select(a => a.Topic);
}
private Action<ISubscriptionConfiguration> TopicInfo(AutoSubscriberConsumerInfo subscriptionInfo)
{
var topics = GetTopAttributeValues(subscriptionInfo);
if (topics.Count() != 0)
{
return GenerateConfigurationFromTopics(topics);
}
return configuration => configuration.WithTopic("#");
}
private Action<ISubscriptionConfiguration> GenerateConfigurationAction(AutoSubscriberConsumerInfo subscriptionInfo)
{
return sc =>
{
ConfigureSubscriptionConfiguration(sc);
TopicInfo(subscriptionInfo)(sc);
AutoSubscriberConsumerInfo(subscriptionInfo)(sc);
};
}
protected virtual AutoSubscriberConsumerAttribute GetSubscriptionAttribute(AutoSubscriberConsumerInfo consumerInfo)
{
var consumeMethod = ConsumeMethod(consumerInfo);
return(consumeMethod.GetCustomAttributes(typeof(AutoSubscriberConsumerAttribute), true).SingleOrDefault() as AutoSubscriberConsumerAttribute);
}
private Action<IAdvancedSubscriptionConfiguration> TopicInfo(AutoSubscriberConsumerInfo subscriptionInfo)
{
var topics = GetTopAttributeValues(subscriptionInfo);
var allTopics = topics as string[] ?? topics.ToArray();
if (allTopics.Count() != 0)
{
return GenerateConfigurationFromTopics(allTopics);
}
return configuration =>
{
configuration.WithTopic("#");
SubscriptionConfiguration(configuration, subscriptionInfo);
};
}
private MethodInfo ConsumeMethod(AutoSubscriberConsumerInfo consumerInfo)
{
return consumerInfo.ConcreteType.GetMethod(ConsumeMethodName, new[] { consumerInfo.MessageType }) ??
GetExplicitlyDeclaredInterfaceMethod(consumerInfo.MessageType);
}
private MethodInfo ConsumeMethod(AutoSubscriberConsumerInfo consumerInfo)
{
return(consumerInfo.ConcreteType.GetMethod(ConsumeMethodName, new[] { consumerInfo.MessageType }) ??
GetExplicitlyDeclaredInterfaceMethod(consumerInfo.MessageType));
}
private static SubscriptionConfigurationAttribute GetSubscriptionConfigurationAttributeValue(AutoSubscriberConsumerInfo subscriptionInfo)
{
var customAttributes = subscriptionInfo.ConsumeMethod.GetCustomAttributes(typeof(SubscriptionConfigurationAttribute), true);
return(customAttributes
.OfType <SubscriptionConfigurationAttribute>()
.FirstOrDefault());
}
private static Action <ISubscriptionConfiguration> AutoSubscriberConsumerInfo(AutoSubscriberConsumerInfo subscriptionInfo)
{
var configSettings = GetSubscriptionConfigurationAttributeValue(subscriptionInfo);
if (configSettings == null)
{
return(subscriptionConfiguration => { });
}
return(configuration =>
{
if (configSettings.PrefetchCount > 0)
{
configuration.WithPrefetchCount(configSettings.PrefetchCount);
}
if (configSettings.Expires > 0)
{
configuration.WithExpires(configSettings.Expires);
}
configuration
.WithAutoDelete(configSettings.AutoDelete)
.WithPriority(configSettings.Priority);
});
}
private AwaitableDisposable <ISubscriptionResult> AutoSubscribeConsumerAsync <TMesage, TConsumer>(AutoSubscriberConsumerInfo subscriptionInfo, CancellationToken cancellationToken)
where TMesage : class
where TConsumer : class, IConsume <TMesage>
{
var subscriptionAttribute = GetSubscriptionAttribute(subscriptionInfo);
var subscriptionId = subscriptionAttribute != null ? subscriptionAttribute.SubscriptionId : GenerateSubscriptionId(subscriptionInfo);
var configureSubscriptionAction = GenerateConfigurationAction(subscriptionInfo);
var asyncDispatcher = TaskHelpers.FromAction <TMesage>((m, c) => AutoSubscriberMessageDispatcher.Dispatch <TMesage, TConsumer>(m, c));
return(Bus.PubSub.SubscribeAsync(
subscriptionId,
asyncDispatcher,
configureSubscriptionAction,
cancellationToken
));
}
protected virtual AutoSubscriberConsumerAttribute GetSubscriptionAttribute(AutoSubscriberConsumerInfo consumerInfo)
{
var consumeMethod = consumerInfo.ConcreteType.GetMethod(ConsumeMethodName, new[] { consumerInfo.MessageType });
return consumeMethod.GetCustomAttributes(typeof(AutoSubscriberConsumerAttribute), true).SingleOrDefault() as AutoSubscriberConsumerAttribute;
}
private IEnumerable<string> GetTopAttributeValues(AutoSubscriberConsumerInfo subscriptionInfo)
{
var consumeMethod = ConsumeMethod(subscriptionInfo);
object[] customAttributes = consumeMethod.GetCustomAttributes(typeof(ForTopicAttribute), true);
Console.WriteLine("Attributes for {0} have count {1}", consumeMethod.Name , customAttributes.Count());
return customAttributes
.OfType<ForTopicAttribute>()
.Select(a => a.Topic);
}
private SubscriptionConfigurationAttribute GetSubscriptionConfigurationAttributeValue(AutoSubscriberConsumerInfo subscriptionInfo)
{
var consumeMethod = ConsumeMethod(subscriptionInfo);
object[] customAttributes = consumeMethod.GetCustomAttributes(typeof(SubscriptionConfigurationAttribute), true);
return customAttributes
.OfType<SubscriptionConfigurationAttribute>()
.FirstOrDefault();
}
protected virtual AutoSubscriberConsumerAttribute GetSubscriptionAttribute(AutoSubscriberConsumerInfo consumerInfo)
{
var consumeMethod = ConsumeMethod(consumerInfo);
return consumeMethod.GetCustomAttributes(typeof(AutoSubscriberConsumerAttribute), true).SingleOrDefault() as AutoSubscriberConsumerAttribute;
}
protected virtual AutoSubscriberConsumerAttribute GetSubscriptionAttribute(AutoSubscriberConsumerInfo consumerInfo)
{
var consumeMethod = consumerInfo.ConcreteType.GetMethod(ConsumeMethodName, new[] { consumerInfo.MessageType });
return(consumeMethod.GetCustomAttributes(typeof(AutoSubscriberConsumerAttribute), true).SingleOrDefault() as AutoSubscriberConsumerAttribute);
}
private SubscriptionConfigurationAttribute GetSubscriptionConfigurationAttributeValue(AutoSubscriberConsumerInfo subscriptionInfo)
{
var consumeMethod = ConsumeMethod(subscriptionInfo);
object[] customAttributes = consumeMethod.GetCustomAttributes(typeof(SubscriptionConfigurationAttribute), true).Cast <object>().ToArray();
return(customAttributes
.OfType <SubscriptionConfigurationAttribute>()
.FirstOrDefault());
}
private string CreateSubscriptionId(AutoSubscriberConsumerInfo subscriptionInfo)
{
var subscriptionAttribute = GetSubscriptionAttribute(subscriptionInfo);
return subscriptionAttribute != null ? subscriptionAttribute.SubscriptionId : GenerateSubscriptionId(subscriptionInfo);
}
