Esempio n. 1
0
        /// <summary>
        /// This method executes the request against the command collection.
        /// </summary>
        /// <param name="request">The request state.</param>
        private async Task TransmitResponses(TransmissionPayloadState request)
        {
            //Set the follow on security.
            request.Responses
            .Where((p) => p.SecurityPrincipal == null)
            .ForEach((p) => p.SecurityPrincipal = Thread.CurrentPrincipal as ClaimsPrincipal);

            //Get the payloads that can be processed internally.
            var internalPayload = request.Responses
                                  .Where((p) => ((request.CurrentOptions & ProcessOptions.RouteInternal) > 0) && mCommands.Resolve(p))
                                  .ToList();

            //OK, send the payloads off to the Task Manager for processing.
            internalPayload.ForEach((p) =>
            {
                //Mark internal only to stop any looping.
                //We can do this as we have checked with the command handler that they will be processed
                p.Options = ProcessOptions.RouteInternal;
                mTaskManager.ExecuteOrEnqueue(p, "Dispatcher");
            });

            //Extract the payloads that have been processed internally so that we only have the external payloads left
            var externalPayload = request.Responses.Except(internalPayload).ToList();

            //Send the external payload to their specific destination in paralle;.
            await Task.WhenAll(externalPayload.Select(async(p) => await TransmitPayload(p, request)));
        }
        /// <summary>
        /// This method executes the request against the command collection.
        /// </summary>
        /// <param name="request">The request state.</param>
        private async Task ExecuteCommands(TransmissionPayloadState request)
        {
            try
            {
                request.ExecuteSuccess = await mCommands.Execute(request.Payload, request.Responses);
            }
            catch (Exception ex)
            {
                request.Ex = ex;
            }

            //All good.
            if (request.ExecuteSuccess)
            {
                return;
            }

            //Switch the incoming message to the outgoing collection to be processed
            //by the sender as it has not been processed internally. This will happen if it
            //is not marked as internal only and cannot be resolved locally.
            if (!request.InternalOnly)
            {
                //OK, we are going to send this to the senders, first make sure that this doesn't route back in.
                request.CurrentOptions = ProcessOptions.RouteExternal;
                //Switch the incoming message to the response payload so that they are picked up by the senders.
                request.Responses.Add(request.Payload);

                return;
            }

            ProcessUnhandledPayload(Policies.Microservice.DispatcherUnresolvedRequestMode
                                    , DispatcherRequestUnresolvedReason.MessageHandlerNotFound
                                    , request.Payload);
        }
Esempio n. 3
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 /// <summary>
 /// This method transits a payload and captures and exceptions.
 /// </summary>
 /// <param name="payload">The payload to process.</param>
 /// <param name="request">The request state.</param>
 private async Task TransmitPayload(TransmissionPayload payload, TransmissionPayloadState request)
 {
     try
     {
         request.TransmitSuccess &= await Send(payload);
     }
     catch (Exception ex)
     {
         request.Ex = ex;
         request.TransmitSuccess = false;
     }
 }
Esempio n. 4
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        /// <summary>
        /// This method executes the request against the command collection.
        /// </summary>
        /// <param name="request">The request state.</param>
        private async Task ExecuteCommands(TransmissionPayloadState request)
        {
            try
            {
                request.ExecuteSuccess = await mCommands.Execute(request.Payload, request.Responses);
            }
            catch (Exception ex)
            {
                request.Ex = ex;
            }

            //All good.
            if (request.ExecuteSuccess)
            {
                return;
            }

            //Switch the incoming message to the outgoing collection to be processed
            //by the sender as it has not been processed internally. This will happen if it
            //is not marked as internal only and cannot be resolved locally.
            if (!request.InternalOnly)
            {
                //OK, we are going to send this to the senders, first make sure that this doesn't route back in.
                request.CurrentOptions = ProcessOptions.RouteExternal;
                //Switch the incoming message to the response payload so that they are picked up by the senders.
                request.Responses.Add(request.Payload);

                return;
            }

            //OK, we have an problem. We log this as an error and get out of here.
            mDataCollection.DispatcherPayloadUnresolved(request.Payload, DispatcherRequestUnresolvedReason.MessageHandler);

            //Raise an event for the unresolved wrapper
            mEventsWrapper.OnProcessRequestUnresolved(request.Payload, DispatcherRequestUnresolvedReason.MessageHandler);

            switch (Policy.Microservice.DispatcherUnhandledMode)
            {
            case DispatcherUnhandledMessageAction.Ignore:
                //request.IsSuccess = !request.IsFaulted;
                break;

            case DispatcherUnhandledMessageAction.AttemptResponseFailMessage:
                //request.IsSuccess = true;
                break;

            case DispatcherUnhandledMessageAction.Exception:
                //request.IsSuccess = true;
                break;
            }
        }
Esempio n. 5
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        /// <summary>
        /// This is the core method that messages are sent to to be routed and processed.
        /// You can override this task in your service to help debug the messages that are passing
        /// though.
        /// </summary>
        /// <param name="requestPayload">The request payload.</param>
        protected virtual async Task Execute(TransmissionPayload requestPayload)
        {
            var request = new TransmissionPayloadState(requestPayload
                                                       , Policy.Microservice.DispatcherTransitCountMax
                                                       , StatisticsInternal.ActiveIncrement());

            try
            {
                Thread.CurrentPrincipal = request.Payload.SecurityPrincipal;

                mEventsWrapper.OnExecuteBegin(request);

                //Validate the imcoming request is correct and not cancelled.
                request.IncomingValidate();

                //Log the telemtry for the incoming message.
                mDataCollection.DispatcherPayloadIncoming(request.Payload);

                //Check that we have not exceeded the maximum transit count.
                request.IncrementAndVerifyDispatcherTransitCount();

                //Shortcut for external messages - send straight out
                if (request.ExternalOnly)
                {
                    await TransmitPayload(request.Payload, request);
                }
                else
                {
                    //Execute the message against the internal commands
                    await ExecuteCommands(request);

                    //OK, do we have any response from the commands to send on, both internal and external messages?
                    if (request.Responses.Count > 0)
                    {
                        await TransmitResponses(request);
                    }
                }
            }
            catch (DispatcherException dex)
            {
                mDataCollection.DispatcherPayloadException(dex.Payload, dex);

                mEventsWrapper.OnProcessRequestError(dex.Payload, dex);
            }
            catch (Exception ex)
            {
                mDataCollection.DispatcherPayloadException(request.Payload, ex);

                mEventsWrapper.OnProcessRequestError(request.Payload, ex);
            }
            finally
            {
                //Signal to the underlying listener that the message can be released.
                request.Signal();

                int delta = StatisticsInternal.ActiveDecrement(request.TimerStart);

                //Log the telemtry for the specific message channelId.
                mDataCollection.DispatcherPayloadComplete(request.Payload, delta, request.IsSuccess());

                if (!request.IsSuccess())
                {
                    StatisticsInternal.ErrorIncrement();
                }

                mEventsWrapper.OnExecuteComplete(request);

                //Set the thread principal to null before leaving.
                Thread.CurrentPrincipal = null;
            }
        }