@terminus/ngx-tools
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37 lines • 4.65 kB
JavaScript
var DEFAULT_JITTER_FACTOR = .3;
var DEFAULT_BACK_OFF_TIME = 2;
var DEFAULT_BASE_WAIT_TIME = 100;
/**
* Calculate retry timing
*
* `jitter`: "Slight irregular movement, variation, or unsteadiness,
* especially in an electrical signal or electronic device"
*
* @param options - The options object
* - `jitter`: If the duration should be affected by a jitter effect
* - `jitterFactor`: How widely the jitter effect should vary
* - `backOffFactor`: How quickly the duration should back off
* - `baseWaitTime`: The base time when determining sleep duration
* @returns The duration to sleep
*
* @example
* const calcOpts: DelayCalculator = {
* jitter: true,
* jitterFactor: .3,
* backOffFactor: 2,
* baseWaitTime: 100,
* }
* // Create a retrier with a custom backoff
* retryWithBackoff({retries: 3, delayCalculator: exponentialBackoffDelayCalculator(calcOpts)})
*/
export var exponentialBackoffDelayCalculator = function (_a) {
var _b = _a.jitter, jitter = _b === void 0 ? true : _b, _c = _a.jitterFactor, jitterFactor = _c === void 0 ? DEFAULT_JITTER_FACTOR : _c, _d = _a.backOffFactor, backOffFactor = _d === void 0 ? DEFAULT_BACK_OFF_TIME : _d, _e = _a.baseWaitTime, baseWaitTime = _e === void 0 ? DEFAULT_BASE_WAIT_TIME : _e;
return function (attempt) {
var sleepDuration = baseWaitTime * Math.pow(backOffFactor, attempt);
if (jitter) {
sleepDuration *= (1 - (jitterFactor * Math.random()));
}
return sleepDuration;
};
};
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