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Orchestration-based SAGA Implementation - Rollback

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

answer Orchestration-based SAGA Implementation - Rollback

Orchestration-based SAGA Implementation - Rollback

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Orchestration Saga Pattern with Spring Boot. Handling transactions and maintaining data consistency among all the microservices are difficult in general. When multiple services are involved like payment, inventory, fraud check, shipping check…..etc it would be very difficult to manage such a complex workflow with multiple steps without a coordinator. By introducing a separate service for orchestration, order-service is freed up from these responsibilities.

@Service
public class OrchestratorService {

    @Autowired
    @Qualifier("payment")
    private WebClient paymentClient;

    @Autowired
    @Qualifier("inventory")
    private WebClient inventoryClient;

    public Mono<OrchestratorResponseDTO> orderProduct(final OrchestratorRequestDTO requestDTO){
        Workflow orderWorkflow = this.getOrderWorkflow(requestDTO);
        return Flux.fromStream(() -> orderWorkflow.getSteps().stream())
                .flatMap(WorkflowStep::process)
                .handle(((aBoolean, synchronousSink) -> {
                    if(aBoolean)
                        synchronousSink.next(true);
                    else
                        synchronousSink.error(new WorkflowException("create order failed!"));
                }))
                .then(Mono.fromCallable(() -> getResponseDTO(requestDTO, OrderStatus.ORDER_COMPLETED)))
                .onErrorResume(ex -> this.revertOrder(orderWorkflow, requestDTO));

    }

    private Mono<OrchestratorResponseDTO> revertOrder(final Workflow workflow, final OrchestratorRequestDTO requestDTO){
        return Flux.fromStream(() -> workflow.getSteps().stream())
                .filter(wf -> wf.getStatus().equals(WorkflowStepStatus.COMPLETE))
                .flatMap(WorkflowStep::revert)
                .retry(3)
                .then(Mono.just(this.getResponseDTO(requestDTO, OrderStatus.ORDER_CANCELLED)));
    }

    private Workflow getOrderWorkflow(OrchestratorRequestDTO requestDTO){
        WorkflowStep paymentStep = new PaymentStep(this.paymentClient, this.getPaymentRequestDTO(requestDTO));
        WorkflowStep inventoryStep = new InventoryStep(this.inventoryClient, this.getInventoryRequestDTO(requestDTO));
        return new OrderWorkflow(List.of(paymentStep, inventoryStep));
    }

    private OrchestratorResponseDTO getResponseDTO(OrchestratorRequestDTO requestDTO, OrderStatus status){
        OrchestratorResponseDTO responseDTO = new OrchestratorResponseDTO();
        responseDTO.setOrderId(requestDTO.getOrderId());
        responseDTO.setAmount(requestDTO.getAmount());
        responseDTO.setProductId(requestDTO.getProductId());
        responseDTO.setUserId(requestDTO.getUserId());
        responseDTO.setStatus(status);
        return responseDTO;
    }

    private PaymentRequestDTO getPaymentRequestDTO(OrchestratorRequestDTO requestDTO){
        PaymentRequestDTO paymentRequestDTO = new PaymentRequestDTO();
        paymentRequestDTO.setUserId(requestDTO.getUserId());
        paymentRequestDTO.setAmount(requestDTO.getAmount());
        paymentRequestDTO.setOrderId(requestDTO.getOrderId());
        return paymentRequestDTO;
    }

    private InventoryRequestDTO getInventoryRequestDTO(OrchestratorRequestDTO requestDTO){
        InventoryRequestDTO inventoryRequestDTO = new InventoryRequestDTO();
        inventoryRequestDTO.setUserId(requestDTO.getUserId());
        inventoryRequestDTO.setProductId(requestDTO.getProductId());
        inventoryRequestDTO.setOrderId(requestDTO.getOrderId());
        return inventoryRequestDTO;
    }

}

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

Popularity 1/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: implementation java rollback saga

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Contributed on Feb 03 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Orchestration-based SAGA Implementation - Rollback

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