backoff-web/src/strategy/fibonacci.js

Fibonacci and exponential backoffs.

const BackoffStrategy = require('./strategy');

// Fibonacci backoff strategy.
class FibonacciBackoffStrategy extends BackoffStrategy {
  constructor (options) {
    super(options);
    this.backoffDelay_ = 0;
    this.nextBackoffDelay_ = this.getInitialDelay();
  }

  next_ () {
    const backoffDelay = Math.min(this.nextBackoffDelay_, this.getMaxDelay());
    this.nextBackoffDelay_ += this.backoffDelay_;
    this.backoffDelay_ = backoffDelay;
    return backoffDelay;
  }

  reset_ () {
    this.nextBackoffDelay_ = this.getInitialDelay();
    this.backoffDelay_ = 0;
  }
}

module.exports = FibonacciBackoffStrategy;