private bool TryHandleMessage(object message)
{
var messageType = message.GetType();
var handlerItem = _handler.MessageDispatcher.GetHandler(messageType);
if (handlerItem == null)
{
// if generic argument, try to instantiate a generic handler by the given payload type.
if (messageType.IsGenericType)
{
var genericHandlerItem = _handler.MessageDispatcher.GetHandler(messageType.GetGenericTypeDefinition());
if (genericHandlerItem != null)
{
handlerItem = genericHandlerItem.GenericHandlerBuilder(messageType);
_handler.MessageDispatcher.AddHandler(messageType, handlerItem);
}
}
if (handlerItem == null)
{
return(false);
}
}
if (handlerItem.AsyncHandler != null)
{
var context = new MessageHandleContext {
Self = Self, Sender = base.Sender, CancellationToken = CancellationToken
};
if (handlerItem.IsReentrant)
{
_activeReentrantCount += 1;
}
else
{
BecomeStacked(OnReceiveInAtomicTask);
_currentAtomicContext = context;
}
using (new SynchronizationContextSwitcher(new ActorSynchronizationContext(context)))
{
handlerItem.AsyncHandler(this, message)
.ContinueWith(t => OnTaskCompleted(t.Exception, handlerItem.IsReentrant),
TaskContinuationOptions.ExecuteSynchronously);
}
}
else
{
handlerItem.Handler(this, message);
}
return(true);
}
private void InitializeActorState()
{
_cancellationTokenSource = new CancellationTokenSource();
_activeReentrantCount = 0;
_activeReentrantAsyncRequestSet = null;
_currentAtomicContext = null;
_requestWaiter = null;
if (_handler.PerInstanceFilterCreators.Count > 0)
{
_perInstanceFilterList = new InterfacedActorPerInstanceFilterList(this, _handler.PerInstanceFilterCreators);
}
}
public void OnResponseMessage(ResponseMessage response, MessageHandleContext currentAtomicContext)
{
ResponseWaitingItem waitingItem;
if (_responseWaitingItems.TryRemove(response.RequestId, out waitingItem) == false)
{
return;
}
// Because OnResponseMessage is always called in a message loop of actor,
// it's safe to run post callback synchronously if possible.
// This optimization remove one message hop.
ActorSynchronizationContext.EnableSynchronousPost(currentAtomicContext);
waitingItem.ResponseHandler(waitingItem.TaskCompletionSource, response);
}
private void InvokeOnStart(bool restarted)
{
var context = new MessageHandleContext {
Self = Self, Sender = base.Sender, CancellationToken = CancellationToken
};
BecomeStacked(OnReceiveInAtomicTask);
_currentAtomicContext = context;
using (new SynchronizationContextSwitcher(new ActorSynchronizationContext(context)))
{
OnStart(restarted).ContinueWith(
t => OnTaskCompleted(t.Exception, false),
TaskContinuationOptions.ExecuteSynchronously);
}
}
private void InvokeOnGracefulStop()
{
var context = new MessageHandleContext {
Self = Self, CancellationToken = CancellationToken
};
BecomeStacked(OnReceiveInAtomicTask);
_currentAtomicContext = context;
using (new SynchronizationContextSwitcher(new ActorSynchronizationContext(context)))
{
OnGracefulStop().ContinueWith(
t => OnTaskCompleted(t.Exception, false, stopOnCompleted: true),
TaskContinuationOptions.ExecuteSynchronously);
}
}
private void OnTaskCompleted(Exception exception, bool isReentrant, bool stopOnCompleted = false)
{
if (isReentrant)
{
_activeReentrantCount -= 1;
}
else
{
_currentAtomicContext = null;
UnbecomeStacked();
Stash.UnstashAll();
}
if (exception != null)
{
((ActorCell)Context).InvokeFailure(exception);
}
else if (stopOnCompleted)
{
Context.Stop(Self);
}
}
private void OnTaskRunMessage(TaskRunMessage taskRunMessage)
{
var context = new MessageHandleContext {
Self = Self, Sender = base.Sender, CancellationToken = CancellationToken
};
if (taskRunMessage.IsReentrant)
{
_activeReentrantCount += 1;
}
else
{
BecomeStacked(OnReceiveInAtomicTask);
_currentAtomicContext = context;
}
using (new SynchronizationContextSwitcher(new ActorSynchronizationContext(context)))
{
taskRunMessage.Function()
.ContinueWith(t => OnTaskCompleted(t.Exception, taskRunMessage.IsReentrant),
TaskContinuationOptions.ExecuteSynchronously);
}
}
public static void EnableSynchronousPost(MessageHandleContext currentAtomicContext)
{
s_synchronousPostEnabled = true;
s_currentAtomicContext = currentAtomicContext;
}
public ActorSynchronizationContext(MessageHandleContext context)
{
_context = context;
}
public static void EnableSynchronousPost(MessageHandleContext currentAtomicContext)
{
s_synchronousPostEnabled = true;
s_currentAtomicContext = currentAtomicContext;
}
public ActorSynchronizationContext(MessageHandleContext context)
{
_context = context;
}
private void OnNotificationMessage(NotificationMessage notification)
{
object observerContext = null;
if (notification.ObserverId != 0)
{
observerContext = EnsureObserverMap().GetContext(notification.ObserverId);
if (observerContext == null)
{
// because it could be a removed observer, doesn't log anything.
return;
}
}
if (notification.InvokePayload == null)
{
Context.System.EventStream.Publish(new Event.Warning(
Self.Path.ToString(), GetType(),
$"Receives a bad notification with no payload from {Sender}"));
return;
}
var payloadType = notification.InvokePayload.GetType();
var handlerItem = _handler.NotificationDispatcher.GetHandler(payloadType);
if (handlerItem == null)
{
// if generic argument, try to instantiate a generic handler by the given payload type.
if (payloadType.IsGenericType)
{
var genericHandlerItem = _handler.NotificationDispatcher.GetHandler(payloadType.GetGenericTypeDefinition());
if (genericHandlerItem != null)
{
handlerItem = genericHandlerItem.GenericHandlerBuilder(payloadType);
_handler.NotificationDispatcher.AddHandler(payloadType, handlerItem);
}
}
// oops, no handler.
if (handlerItem == null)
{
Context.System.EventStream.Publish(new Event.Warning(
Self.Path.ToString(), GetType(),
$"Cannot find a handler for notification {notification.InvokePayload.GetType()} from {Sender}"));
return;
}
}
if (handlerItem.Handler != null)
{
// sync handle
try
{
_observerContext = observerContext;
handlerItem.Handler(this, notification);
}
finally
{
_observerContext = null;
}
}
else
{
// async handle
var context = new MessageHandleContext {
Self = Self, Sender = base.Sender, CancellationToken = CancellationToken, ObserverContext = observerContext
};
if (handlerItem.IsReentrant)
{
_activeReentrantCount += 1;
}
else
{
BecomeStacked(OnReceiveInAtomicTask);
_currentAtomicContext = context;
}
using (new SynchronizationContextSwitcher(new ActorSynchronizationContext(context)))
{
handlerItem.AsyncHandler(this, notification)
.ContinueWith(t => OnTaskCompleted(t.Exception, handlerItem.IsReentrant),
TaskContinuationOptions.ExecuteSynchronously);
}
}
}
private void OnRequestMessage(RequestMessage request)
{
var sender = base.Sender;
if (request.InvokePayload == null)
{
sender.Tell(new ResponseMessage
{
RequestId = request.RequestId,
Exception = new RequestMessageException("Empty payload")
});
Context.System.EventStream.Publish(new Event.Warning(
Self.Path.ToString(), GetType(),
$"Receives a bad request without payload from {Sender}"));
return;
}
var payloadType = request.InvokePayload.GetType();
var handlerItem = _handler.RequestDispatcher.GetHandler(payloadType);
if (handlerItem == null)
{
// if generic argument, try to instantiate a generic handler by the given payload type.
if (payloadType.IsGenericType)
{
var genericHandlerItem = _handler.RequestDispatcher.GetHandler(payloadType.GetGenericTypeDefinition());
if (genericHandlerItem != null)
{
handlerItem = genericHandlerItem.GenericHandlerBuilder(payloadType);
_handler.RequestDispatcher.AddHandler(payloadType, handlerItem);
}
}
// oops, no handler.
if (handlerItem == null)
{
sender.Tell(new ResponseMessage
{
RequestId = request.RequestId,
Exception = new RequestHandlerNotFoundException()
});
Context.System.EventStream.Publish(new Event.Warning(
Self.Path.ToString(), GetType(),
$"Cannot find a handler for request {payloadType} from {Sender}"));
return;
}
}
if (handlerItem.Handler != null)
{
// sync handle
handlerItem.Handler(this, request, (response, exception) =>
{
if (request.RequestId != 0)
{
sender.Tell(response);
}
if (exception != null)
{
((ActorCell)Context).InvokeFailure(exception);
}
});
}
else
{
// async handle
var context = new MessageHandleContext {
Self = Self, Sender = base.Sender, CancellationToken = CancellationToken, RequestId = request.RequestId
};
if (handlerItem.IsReentrant)
{
_activeReentrantCount += 1;
if (request.RequestId != 0)
{
if (_activeReentrantAsyncRequestSet == null)
{
_activeReentrantAsyncRequestSet = new HashSet <MessageHandleContext>();
}
_activeReentrantAsyncRequestSet.Add(context);
}
}
else
{
BecomeStacked(OnReceiveInAtomicTask);
_currentAtomicContext = context;
}
using (new SynchronizationContextSwitcher(new ActorSynchronizationContext(context)))
{
var requestId = request.RequestId;
var isReentrant = handlerItem.IsReentrant;
handlerItem.AsyncHandler(this, request, (response, exception) =>
{
if (requestId != 0)
{
if (isReentrant)
{
_activeReentrantAsyncRequestSet.Remove(context);
}
sender.Tell(response);
}
OnTaskCompleted(exception, isReentrant);
});
}
}
}
