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Merge pull request #3 from MvRens/feature/DynamicQueueStrategy

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Added prefix option for dynamic queues
This commit is contained in:
Mark van Renswoude 2018-09-03 08:59:42 +02:00 committed by GitHub
commit 455a7a204e
4 changed files with 78 additions and 17 deletions
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13
Tapeti.Annotations/DynamicQueueAttribute.cs
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@ -9,5 +9,18 @@ namespace Tapeti.Annotations
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class DynamicQueueAttribute : Attribute
{
public string Prefix { get; set; }
/// <summary>
/// If prefix is specified, Tapeti will compose the queue name using the
/// prefix and a unique ID. If not specified, an empty queue name will be passed
/// to RabbitMQ thus letting it create a unique queue name.
/// </summary>
/// <param name="prefix"></param>
public DynamicQueueAttribute(string prefix = null)
{
Prefix = prefix;
}
}
}

2
Tapeti/Connection/TapetiWorker.cs
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@ -70,7 +70,7 @@ namespace Tapeti.Connection
if (queue.Dynamic)
{
var dynamicQueue = channel.QueueDeclare();
var dynamicQueue = channel.QueueDeclare(queue.Name);
(queue as IDynamicQueue)?.SetName(dynamicQueue.QueueName);
foreach (var binding in queue.Bindings)

79
Tapeti/TapetiConfig.cs
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@ -22,7 +22,7 @@ namespace Tapeti
public class TapetiConfig
{
private readonly Dictionary<string, List<Binding>> staticRegistrations = new Dictionary<string, List<Binding>>();
private readonly Dictionary<Type, List<Binding>> dynamicRegistrations = new Dictionary<Type, List<Binding>>();
private readonly Dictionary<string, Dictionary<Type, List<Binding>>> dynamicRegistrations = new Dictionary<string, Dictionary<Type, List<Binding>>>();
private readonly List<IBindingMiddleware> bindingMiddleware = new List<IBindingMiddleware>();
private readonly List<IMessageMiddleware> messageMiddleware = new List<IMessageMiddleware>();
@ -49,20 +49,47 @@ namespace Tapeti
var queues = new List<IQueue>();
queues.AddRange(staticRegistrations.Select(qb => new Queue(new QueueInfo { Dynamic = false, Name = qb.Key }, qb.Value)));
// Group all bindings with the same index into queues, this will
// ensure each message type is unique on their queue
var dynamicBindings = new List<List<Binding>>();
foreach (var bindings in dynamicRegistrations.Values)
// We want to ensure each queue only has unique messages classes. This means we can requeue
// without the side-effect of calling other handlers for the same message class again as well.
//
// Since I had trouble deciphering this code after a year, here's an overview of how it achieves this grouping
// and how the bindingIndex is relevant:
//
// dynamicRegistrations:
// Key (prefix)
// ""
// Key (message class) Value (list of bindings)
// A binding1, binding2, binding3
// B binding4
// "prefix"
// A binding5, binding6
//
// By combining all bindings with the same index, per prefix, the following queues will be registered:
//
// Prefix Bindings
// "" binding1 (message A), binding4 (message B)
// "" binding2 (message A)
// "" binding3 (message A)
// "prefix" binding5 (message A)
// "prefix" binding6 (message A)
//
foreach (var prefixGroup in dynamicRegistrations)
{
while (dynamicBindings.Count < bindings.Count)
dynamicBindings.Add(new List<Binding>());
var dynamicBindings = new List<List<Binding>>();
for (var bindingIndex = 0; bindingIndex < bindings.Count; bindingIndex++)
dynamicBindings[bindingIndex].Add(bindings[bindingIndex]);
foreach (var bindings in prefixGroup.Value.Values)
{
while (dynamicBindings.Count < bindings.Count)
dynamicBindings.Add(new List<Binding>());
for (var bindingIndex = 0; bindingIndex < bindings.Count; bindingIndex++)
dynamicBindings[bindingIndex].Add(bindings[bindingIndex]);
}
queues.AddRange(dynamicBindings.Select(bl => new Queue(new QueueInfo { Dynamic = true, Name = GetDynamicQueueName(prefixGroup.Key) }, bl)));
}
queues.AddRange(dynamicBindings.Select(bl => new Queue(new QueueInfo { Dynamic = true }, bl)));
var config = new Config(dependencyResolver, messageMiddleware, cleanupMiddleware, publishMiddleware, queues);
(dependencyResolver as IDependencyContainer)?.RegisterDefaultSingleton<IConfig>(config);
@ -317,10 +344,21 @@ namespace Tapeti
protected void AddDynamicRegistration(IBindingContext context, Binding binding)
{
if (dynamicRegistrations.ContainsKey(context.MessageClass))
dynamicRegistrations[context.MessageClass].Add(binding);
else
dynamicRegistrations.Add(context.MessageClass, new List<Binding> { binding });
var prefix = binding.QueueInfo.Name ?? "";
if (!dynamicRegistrations.TryGetValue(prefix, out Dictionary<Type, List<Binding>> prefixRegistrations))
{
prefixRegistrations = new Dictionary<Type, List<Binding>>();
dynamicRegistrations.Add(prefix, prefixRegistrations);
}
if (!prefixRegistrations.TryGetValue(context.MessageClass, out List<Binding> bindings))
{
bindings = new List<Binding>();
prefixRegistrations.Add(context.MessageClass, bindings);
}
bindings.Add(binding);
}
@ -333,7 +371,7 @@ namespace Tapeti
throw new TopologyConfigurationException($"Cannot combine static and dynamic queue attributes on {member.Name}");
if (dynamicQueueAttribute != null)
return new QueueInfo { Dynamic = true };
return new QueueInfo { Dynamic = true, Name = dynamicQueueAttribute.Prefix };
if (durableQueueAttribute != null)
return new QueueInfo { Dynamic = false, Name = durableQueueAttribute.Name };
@ -342,6 +380,15 @@ namespace Tapeti
}
protected string GetDynamicQueueName(string prefix)
{
if (String.IsNullOrEmpty(prefix))
return "";
return prefix + "." + Guid.NewGuid().ToString("N");
}
protected class QueueInfo
{
public bool? Dynamic { get; set; }

1
Test/MarcoController.cs
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@ -134,6 +134,7 @@ namespace Test
[DynamicQueue("custom.prefix")]
public void Polo(PoloMessage message)
{
Console.WriteLine(">> Polo");