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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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Multiple repositories for same data store but different domain logic?

I am building a feature that is powered by a given table, called Urls, structured as below: externalId| activatedId | url | userId This table is populated, driven by 2 scenarios (flows): Whenever a user creates an account in my system, a event is…
Sammy
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Azure Event Hub: There can be at most 5 concurrent readers on a partition per consumer group

According too Microsoft docs There can be at most 5 concurrent readers on a partition per consumer group; however it is recommended that there is only one active receiver on a partition per consumer group. Within a single partition, each reader…
Kevin Peters
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Integration of Keycloak event listener with SprinBoot application

I wrote my custom Event listener SPI plugin that console logs all events (user event + admin event) in Keycloak. I deployed it in my Keycloak server and tested; everything works fine. Now, what could be the best way to send events from my plugin to…
paradox
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Which messages should be published to a Kafka topic, and when?

I have some few services, like Catalog Service, Customer Service, Recommendations Service, Order Taking Service and so on ..., each service has its own Keyspace in a Cassandra database. I have two questions: 1 - For a change in a service: should I…
acmoune
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CQRS and Event Sourcing - Read your own events

Currently, I'm implementing Event Driven Architecture and have a service for command (write part) and another service for query (read part). What I'm doing right now. Accept a command on CommandService Store event and publish event on an event…
Ahmed Alaa El-Din
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Kafka - Difference between Events with batch data and Streams

What is the fundamental difference between an event with a batch of data attached and a kafka stream that occasionally sends data ? Can they be used interchangeably ? When should I use the first and when the latter ? Could you provide some simple…
Cap Barracudas
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In DDD: Commands that produce events that no one consumes

I am applying Domain driven design in my project and I am running into a scenario where a user action translates into a command in one of my bounded contexts and thus produces an event. However I see that none of my other bounded contexts would…
john
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What are good strategies on publishing/emitting events with huge payload(json/xml)?

On a use case that a microsevice publishes/emitts an event that may contain a payload of hundreds of thousands of records, how would you pass this on your event store? Are there any practices around this? Is it a good idea to split the event in…
froi
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Azure Messaging services: detecting the absence of a message

Within an Azure micro-services environment, implementing an event driven architecture, I have the challenge of acting upon a received event. I also have the counter challenge of detecting a duration with no events. Has anyone identified a way in…
Adam
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Data Model/Schema decoupling in Data Processing Pipeline suing Event Driven Architecture

I was wondering how Microservices in the Streaming Pipeline based on Event Driven Architecture can be truly decoupled from the data model perspective. We have implemented a data processing pipeline using Event-Driven Architecture where the data…
Ali
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Spring dataflow and GCP Pub Sub

I'm building an event-driven microservice architecture, which is supposed to be Cloud agnostic (as much as possible). Since this is initially going in GCP and I don't want to spend a long time in configurations and all that, I was going to use GCP's…
CCC
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OOA&D / Java / Software Architecture - advise on structuring event handling code to avoid a complicated data flow

I've implemented the producer/consumer paradigm with a message broker in Spring and my producers use WebSocket to extract and publish data into the queue. A producer is therefore something…
Allen Hacks
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Java-Need to access a single object in several "Controller.java" files

Creating a simple Automated Teller Machine(ATM) using OOP in Java. The console version was easy. I'm stuck on the event-driven GUI version. I've created all the views using SceneBuilder. Each scene has a "controller.java" file to manage movement…
scott parent
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What is the most efficient way to store and recall one object from either of two unique keys in Java?

I am working on creating a very performance-focused event-driven system. In this program, I have one object that needs to be linked to two different unique keys. The object contains parameters of what to do when one of two different events is…
Petre247
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Calling functions one after other in event driven programming

I'm working on a software where software issues commands for hardware panel and once a command is issued, its response received after few seconds . there are different functions for different hardware commands like public void FunctionA() { …
user8938436
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