public void Invoke(IEvent evnt, MethodInfo handlerMethod, EventDispatchingContext context)
{
if (TypeUtil.IsAttributeDefinedInMethodOrDeclaringClass(handlerMethod, typeof(HandleAsyncAttribute)))
{
Task.Factory.StartNew(() => InvokeHandler(evnt, handlerMethod, context));
}
else
{
InvokeHandler(evnt, handlerMethod, context);
}
}
private void InvokeHandler(IEvent evnt, MethodInfo method, EventDispatchingContext context)
{
var handlerType = method.DeclaringType;
var handler = CreateHandlerInstance(handlerType, context);
try
{
method.Invoke(handler, new object[] { evnt });
}
catch (Exception ex)
{
throw new EventHandlerException("Event handler throws an exception, please check inner exception for detail. Handler type: " + handlerType + ".", ex);
}
}
public void Dispatch(IEvent evnt, EventDispatchingContext context)
{
Require.NotNull(evnt, "evnt");
Require.NotNull(context, "context");
var eventType = evnt.GetType();
// Dispatch event to system handlers
Dispatch(evnt, context, _handlerRegistry.FindHandlerMethods(EventConstants.SystemHandlerGroup, eventType));
// Dispatch event to plugin handlers
foreach (var plugin in PluginManager.EnabledPlugins)
{
Dispatch(evnt, context, _handlerRegistry.FindHandlerMethods(plugin.Name, eventType));
}
}
private object CreateHandlerInstance(Type handlerType, EventDispatchingContext context)
{
try
{
var handler = Activator.CreateInstance(handlerType);
var unitOfWorkAware = handler as IUnitOfWorkAware;
if (unitOfWorkAware != null)
{
unitOfWorkAware.UnitOfWork = context.UnitOfWork;
}
return handler;
}
catch (Exception ex)
{
throw new EventHandlerException("Failed creating event handler instance. Handler type: " + handlerType + ".", ex);
}
}
private void Dispatch(IEvent evnt, EventDispatchingContext context, IEnumerable<MethodInfo> handlerMethods)
{
foreach (var method in handlerMethods)
{
var awaitCommit = TypeUtil.IsAttributeDefinedInMethodOrDeclaringClass(method, typeof(AwaitCommittedAttribute));
if (awaitCommit && context.UnitOfWorkStage != UnitOfWorkStage.Committed)
{
continue;
}
if (!awaitCommit && context.UnitOfWorkStage == UnitOfWorkStage.Committed)
{
continue;
}
_handlerInvoker.Invoke(evnt, method, context);
}
}
