javascript / expert
Snippet
Advanced Error Recovery with Exponential Backoff
Implementing exponential backoff is a best practice for handling transient network failures. Instead of retrying immediately, the delay increases exponentially with each attempt, preventing the client from overwhelming a struggling server.
snippet.js
javascript
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import { timer, throwError } from 'rxjs';import { retry, mergeMap } from 'rxjs/operators';const retryStrategy = (maxRetries: number = 3) => retry({count: maxRetries,delay: (error, retryCount) => {console.warn(`Retry attempt ${retryCount}...`);return timer(Math.pow(2, retryCount) * 1000);}});this.http.get('/api/data').pipe(retryStrategy()).subscribe();
angular
Breakdown
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retry({ count, delay })
The retry operator configuration that specifies how many times and when to re-subscribe to the source.
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Math.pow(2, retryCount) * 1000
Calculates the exponential delay (2s, 4s, 8s, etc.) based on the current attempt number.
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timer(...)
Creates an observable that waits for the calculated duration before triggering the next retry attempt.