Saga Failure and Retry Strategy

Uses SagaMonitor to understand the flow of saga retries and failures, enabling a strategic response to common execution issues.

class SagaMonitor {
    static retrySagaStep(sagaStep, maxRetries, currentRetry = 0) {
        sagaStep()
            .then(() => console.log('Saga step succeeded'))
            .catch((error) => {
                if (currentRetry < maxRetries) {
                    console.log(`Retry ${currentRetry + 1} of ${maxRetries}`);
                    SagaMonitor.retrySagaStep(sagaStep, maxRetries, currentRetry + 1);
                } else {
                    console.log('Max retries reached, compensating...');
                    // Trigger compensating transaction or saga failure logic
                }
            });
    }
}

This piece of code demonstrates a retry mechanism for a saga step using a class called SagaMonitor. When a saga step fails, it will retry executing the step up to a maximum number of retries. If all retries fail, a compensating transaction or failure logic can be triggered.

function performSagaStep() {
    return new Promise((resolve, reject) => {
        // Simulate a saga step that could fail
        const success = Math.random() > 0.5;
        setTimeout(() => {
            if (success) resolve('Step completed');
            else reject('Step failed');
        }, 1000);
    });
}

SagaMonitor.retrySagaStep(performSagaStep, 3);

This code demonstrates how to define a saga step as a function that returns a Promise, simulating a potentially failing operation. The function 'performSagaStep' is then passed to 'SagaMonitor.retrySagaStep' with a maximum of 3 retries, showcasing how a saga step is retried upon failure.