feat: add worker choice strategies retry mechanism

[poolifier.git] / src / utils.ts

diff --git a/src/utils.ts b/src/utils.ts
index 45e4fd2393d0533a5256754eec9075666a7f7ea1..c92edc91de4f68100baefe6c5fd14ded17492363 100644 (file)
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -23,6 +23,7 @@ export const EMPTY_FUNCTION: () => void = Object.freeze(() => {
  */
 export const DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS: WorkerChoiceStrategyOptions =
   {
+    choiceRetries: 6,
     runTime: { median: false },
     waitTime: { median: false },
     elu: { median: false }
@@ -57,6 +58,22 @@ export const availableParallelism = (): number => {
   return availableParallelism
 }
 
+/**
+ * Computes the retry delay in milliseconds using an exponential back off algorithm.
+ *
+ * @param retryNumber - The number of retries that have already been attempted
+ * @param maxDelayRatio - The maximum ratio of the delay that can be randomized
+ * @returns Delay in milliseconds
+ */
+export const exponentialDelay = (
+  retryNumber = 0,
+  maxDelayRatio = 0.2
+): number => {
+  const delay = Math.pow(2, retryNumber) * 100
+  const randomSum = delay * maxDelayRatio * Math.random() // 0-(maxDelayRatio*100)% of the delay
+  return delay + randomSum
+}
+
 /**
  * Computes the median of the given data set.
  *