My new team where I work are currently discussing how we go about changing our current old monolithic applications to go down the route of microservices. We are still at the early discussion and proof of concept phase.
The first proof of concept we are trying out, at a high level, is to mimik a customer adding something to their basket, and what that would entail in the new architecture.
We currently have the following:
What is happening here is as follows:
- Customer hits “Add to basket” button in browser which sends the POST request to the API Gateway
- API Gateway acts as a pass-through, sending an “Add To Basket” request to Rabbit MQ
- Basket Saga picks this request up, starts a new saga
- Basket Saga adds “Add Item to Basket” and “Reserve Item” requests to Rabbit MQ
- Stock Service picks up “Reserve Item” request and reserves it
- Stock Service adds an “Item Reserved” event to Rabbit MQ
- Basket Service picks up “Add Item To Basket” request and adds it
- Basket Service adds an “Item Added” event to Rabbit MQ
- Basket Saga picks up both the “Item Reserved” and “Item Added” events
- Basket Saga posts a “Add To Basket Complete” event to Rabbit MQ
- SignalR Host picks up the “Add To Basket Complete” event
- SignalR Host lets the browser know that the action has completed successfully
Now this is a very simple example just used to test the waters with this type of architecture.
Does this architecture seem sound enough? Or will it give long-term pain? There are obviously other options, like calling the microservices directly from the API Gateway amongst others.
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