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How do you implement a Saga pattern?

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Anjali Sharma answered on January 4, 2023 Popularity 6/10 Helpfulness 1/10

answer How do you implement a Saga pattern?

How do you implement a Saga pattern?

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There are two ways of coordination sagas:

Choreography - each local transaction publishes domain events that trigger local transactions in other services.

Orchestration - an orchestrator (object) tells the participants what local transactions to execute.

public class InventoryStep implements WorkflowStep {

    private final WebClient webClient;
    private final InventoryRequestDTO requestDTO;
    private WorkflowStepStatus stepStatus = WorkflowStepStatus.PENDING;

    public InventoryStep(WebClient webClient, InventoryRequestDTO requestDTO) {
        this.webClient = webClient;
        this.requestDTO = requestDTO;
    }

    @Override
    public WorkflowStepStatus getStatus() {
        return this.stepStatus;
    }

    @Override
    public Mono<Boolean> process() {
        return this.webClient
                .post()
                .uri("/inventory/deduct")
                .body(BodyInserters.fromValue(this.requestDTO))
                .retrieve()
                .bodyToMono(InventoryResponseDTO.class)
                .map(r -> r.getStatus().equals(InventoryStatus.AVAILABLE))
                .doOnNext(b -> this.stepStatus = b ? WorkflowStepStatus.COMPLETE : WorkflowStepStatus.FAILED);
    }

    @Override
    public Mono<Boolean> revert() {
        return this.webClient
                    .post()
                    .uri("/inventory/add")
                    .body(BodyInserters.fromValue(this.requestDTO))
                    .retrieve()
                    .bodyToMono(Void.class)
                    .map(r ->true)
                    .onErrorReturn(false);
    }
}

https://www.baeldung.com/cs/saga-pattern-microservices

Popularity 6/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript saga

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Contributed on Jan 04 2023

Anjali Sharma

0 Answers Avg Quality 2/10

How do you implement a Saga pattern?

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