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Orchestration Saga Pattern:

Pragya Keshap answered on February 16, 2023 Popularity 3/10 Helpfulness 1/10

answer Orchestration Saga Pattern:

Orchestration Saga Pattern:

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In this demo, communication between orchestrator and other services would be a simple HTTP in a non-blocking asynchronous way to make this stateless.

We can also use Kafka topics for this communication. For that we have to use scatter/gather pattern which is more of a stateful style.

@Service
public class InventoryService {

    private Map<Integer, Integer> productInventoryMap;

    @PostConstruct
    private void init(){
        this.productInventoryMap = new HashMap<>();
        this.productInventoryMap.put(1, 5);
        this.productInventoryMap.put(2, 5);
        this.productInventoryMap.put(3, 5);
    }

    public InventoryResponseDTO deductInventory(final InventoryRequestDTO requestDTO){
        int quantity = this.productInventoryMap.getOrDefault(requestDTO.getProductId(), 0);
        InventoryResponseDTO responseDTO = new InventoryResponseDTO();
        responseDTO.setOrderId(requestDTO.getOrderId());
        responseDTO.setUserId(requestDTO.getUserId());
        responseDTO.setProductId(requestDTO.getProductId());
        responseDTO.setStatus(InventoryStatus.UNAVAILABLE);
        if(quantity > 0){
            responseDTO.setStatus(InventoryStatus.AVAILABLE);
            this.productInventoryMap.put(requestDTO.getProductId(), quantity - 1);
        }
        return responseDTO;
    }

    public void addInventory(final InventoryRequestDTO requestDTO){
        this.productInventoryMap
                .computeIfPresent(requestDTO.getProductId(), (k, v) -> v + 1);
    }

}

https://www.vinsguru.com/orchestration-saga-pattern-with-spring-boot/

Popularity 3/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java orchestration saga

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Contributed on Feb 16 2023

Pragya Keshap

0 Answers Avg Quality 2/10

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