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Questions tagged [event-driven-design]

Event Driven Design is the implementation of requirements through a queue of events that are triggered by user input. Callback functions only create event objects and add them to the queue so state remains unchanged.

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Event Driven Microservices: How to send protobuf messages of different types to one AWS SNS(stream)?

I am planning to develop an Event-Driven Microservices. I create a protobuf project, which defines several types of messages. EmployeeMessage UserMessage ProcessMessage ApplicantMessage Then, I compile the protobuf project to different…
Ryan Lyu
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Identity Reference between two bounded contexts

I am looking to get the best practice around DDD/CQRS principles for handing relationships between bounded contexts. We have two BCs Property Management Context and Tenant Portal Context. We have the Home aggregate in the Tenant Portal context,…
Kyle
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Are workflow engine and event stream framework alternatives for an orchestration layer?

I have to implement a document management service as an orchestration layer that orchestrates between underlying service such as storage , parsing , anti virus scan etc. The requirement is to make the layer flexible so that different flows for…
redzedi
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Are there some guidelines for identifying RabbitMQ queues for bounded context in DDD

I am about to make a Domain Driven Design arround RabbitMQ queue, and I am totally new to this. I would like to know if there are some guidelines for identifying the different queues considering the bounded contexts. Stuffs like one queue per…
acmoune
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Multi-threaded Event Dispatching

I am developing a C++ application that will use Lua scripts for external add-ons. The add-ons are entirely event-driven; handlers are registered with the host application when the script is loaded, and the host calls the handlers as the events…
Robert M
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AXON framework synchronous response

I am new to AXON framework and are using it for our development. We have a requirement where command (command side) is created for the persisting data, for the same event is triggered which is consumed at query side. Now we need to have a response…
Jaspal
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How to control idempotency of messages in an event-driven architecture?

I'm working on a project where DynamoDB is being used as database and every use case of the application is triggered by a message published after an item has been created/updated in DB. Currently the code follows this…
Juan Vega
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Event driven design in a multiple project solution

I try to do an iOS application with Xamarin.ios. I have a server where I can send events to my App using websockets. But the functions to handle this events are implemented in another project. So if the server sends a new event I want to tell the…
DerStarkeBaer
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Design question on Python network programming

I'm currently writing a project in Python which has a client and a server part. I have troubles with the network communication, so I need to explain some things... The client mainly does operations the server tells him to and sends the results of…
Manuel Faux
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Does anyone know how to test EventListeners in spring?

I am looking into the spring domain event features in spring 4.2 and it looks really greate. it is however, a bit messy to test. Given the following business logic : public DomainEvent CreateOrder(Order order) throws OrderRejectedException…
Hans Jacob Melby
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event driven pattern for writing chunks to a file - JS

I'm trying to transfer a file over WebRTC, and I'm struggling to figure out a good pattern for writing data as it's coming in. Since file chunks will be coming in at an unknown rate, I need to be able to write each chunk as it becomes available;…
Hristo
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Is this a decent Event Driven approach for a windows service?

I'm reading up on event-driven design. I am having trouble getting my head around some of it in practice. I'm considering using this for a windows service that monitors, parses, and handles information coming from a 3rd party TCP stream. Is the…
Daniel
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C# Event Handlers Using an Enum

I have a StatusChanged event that is raised by my object when its status changes - however, the application needs to carry out additional actions based on what the new status is. e.g If the new status is Disconnected, then it must update the status…
Jimbo
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DDD - aggregate root identity usage across bounded context bounderies

One suggested way to model entity identities in a domain model is to create value objects instead of using primitive types (f.e. in C#): public class CustomerId { public long Id { get; set; } } In my opinion this classes should be used throughout…
Sebastian
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Retry logic when a partial update failed

I think that it is a general problem and it is not related with the using technologies. So, please consider the problem itself. I am storing data in Couchbase like below format productId is document id. { "size", "colour", "category", …
javac
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