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Allows replayStatus to be checked in event handlers #10

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Allows replayStatus to be checked in event handlers #10

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7 changes: 4 additions & 3 deletions src/NEventLite/Core/Domain/AggregateRoot.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,7 @@ private async Task ApplyEventAsync(IEvent<AggregateRoot<TAggregateKey, TEventKey
{
if (CanApply(@event))
{
await DoApplyAsync(@event);
await DoApplyAsync(@event, isNew);

if (isNew)
{
Expand Down Expand Up @@ -140,7 +140,7 @@ private bool CanApply(IEvent<AggregateRoot<TAggregateKey, TEventKey>, TAggregate
&& (CurrentVersion == @event.TargetVersion));
}

private async Task DoApplyAsync(IEvent<AggregateRoot<TAggregateKey, TEventKey>, TAggregateKey, TEventKey> @event)
private async Task DoApplyAsync(IEvent<AggregateRoot<TAggregateKey, TEventKey>, TAggregateKey, TEventKey> @event, bool isNew)
{
if (StreamState == StreamState.NoStream)
{
Expand All @@ -149,7 +149,8 @@ private async Task DoApplyAsync(IEvent<AggregateRoot<TAggregateKey, TEventKey>,

if (_eventHandlerCache.ContainsKey(@event.GetType()))
{
await @event.InvokeOnAggregateAsync(this, _eventHandlerCache[@event.GetType()]);
var replayStatus = isNew ? ReplayStatus.Regular : ReplayStatus.Replay;
await @event.InvokeOnAggregateAsync(this, _eventHandlerCache[@event.GetType()], replayStatus);
}
else
{
Expand Down
8 changes: 8 additions & 0 deletions src/NEventLite/Core/ReplayStatus.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
namespace NEventLite.Core
{
public enum ReplayStatus
{
Regular,
Replay
}
}
24 changes: 16 additions & 8 deletions src/NEventLite/Util/EventExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,23 +9,31 @@ namespace NEventLite.Util
public static class EventExtensions
{
public static async Task InvokeOnAggregateAsync<TAggregateKey, TEventKey>(this IEvent<AggregateRoot<TAggregateKey, TEventKey>, TAggregateKey, TEventKey> @event,
AggregateRoot<TAggregateKey, TEventKey> aggregate, string methodName)
AggregateRoot<TAggregateKey, TEventKey> aggregate, string methodName, ReplayStatus replayStatus)
{
var method = ReflectionHelper.GetMethod(aggregate.GetType(), methodName, new Type[] { @event.GetType() }); //Find the right method

if (method != null)
object[] args;
if (method == null)
{
var task = method.Invoke(aggregate, new object[] { @event }); //invoke with the event as argument

if (task != null && task.GetType() == typeof(Task))
method = ReflectionHelper.GetMethod(aggregate.GetType(), methodName, new Type[] { @event.GetType(), typeof(ReplayStatus) }); // handler with replay status
if (method == null)
{
await (Task)task;
throw new AggregateEventOnApplyMethodMissingException($"No event Apply method found on {aggregate.GetType()} for {@event.GetType()}");
}
args = new object[] {@event, replayStatus};
}
else
{
throw new AggregateEventOnApplyMethodMissingException($"No event Apply method found on {aggregate.GetType()} for {@event.GetType()}");
args = new object[] {@event};
}

var task = method.Invoke(aggregate, args); //invoke with the event handler

if (task != null && task.GetType() == typeof(Task))
{
await (Task)task;
}

}
}
}
6 changes: 5 additions & 1 deletion src/NEventLite/Util/ReflectionHelper.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -25,10 +25,14 @@ public static Dictionary<Type, string> FindEventHandlerMethodsInAggregate<TAggre

var voidMethods = aggregateType.GetMethodsBySig(typeof(void), typeof(InternalEventHandler),
true, eventType).ToList();
var voidMethodsWithReplay = aggregateType.GetMethodsBySig(typeof(void), typeof(InternalEventHandler),
true, eventType, typeof(ReplayStatus)).ToList();
var asyncMethods = aggregateType.GetMethodsBySig(typeof(Task), typeof(InternalEventHandler),
true, eventType).ToList();
var asyncMethodsWithReplay = aggregateType.GetMethodsBySig(typeof(Task), typeof(InternalEventHandler),
true, eventType, typeof(ReplayStatus)).ToList();

var methods = voidMethods.Union(asyncMethods).ToList();
var methods = voidMethods.Union(asyncMethods).Union(voidMethodsWithReplay).Union(asyncMethodsWithReplay).ToList();

if (methods.Any())
{
Expand Down