feat: use SMA and SMM for worker tasks usage

[poolifier.git] / src / utils.ts

diff --git a/src/utils.ts b/src/utils.ts
index c92edc91de4f68100baefe6c5fd14ded17492363..d39bfa02c8498ed54d8bebc8d9ace5a7a7fd756f 100644 (file)
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -44,6 +44,7 @@ export const DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS: MeasurementStatisticsR
  * Always returns a value greater than zero.
  *
  * @returns The host OS optimized maximum pool size.
+ * @internal
  */
 export const availableParallelism = (): number => {
   let availableParallelism = 1
@@ -58,20 +59,41 @@ 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
+//  * @internal
+//  */
+// 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 retry delay in milliseconds using an exponential back off algorithm.
+ * Computes the average of the given data set.
  *
- * @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
+ * @param dataSet - Data set.
+ * @returns The average of the given data set.
+ * @internal
  */
-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
+export const average = (dataSet: number[]): number => {
+  if (Array.isArray(dataSet) && dataSet.length === 0) {
+    return 0
+  }
+  if (Array.isArray(dataSet) && dataSet.length === 1) {
+    return dataSet[0]
+  }
+  return (
+    dataSet.reduce((accumulator, number) => accumulator + number, 0) /
+    dataSet.length
+  )
 }
 
 /**
@@ -79,6 +101,7 @@ export const exponentialDelay = (
  *
  * @param dataSet - Data set.
  * @returns The median of the given data set.
+ * @internal
  */
 export const median = (dataSet: number[]): number => {
   if (Array.isArray(dataSet) && dataSet.length === 0) {
@@ -127,6 +150,7 @@ export const isPlainObject = (obj: unknown): boolean =>
  * @param killBehavior - Which kind of kill behavior to detect.
  * @param value - Any value.
  * @returns `true` if `value` was strictly equals to `killBehavior`, otherwise `false`.
+ * @internal
  */
 export const isKillBehavior = <KB extends KillBehavior>(
   killBehavior: KB,
@@ -154,12 +178,12 @@ export const isAsyncFunction = (
  * @param measurementRequirements - The measurement statistics requirements.
  * @param measurementValue - The measurement value.
  * @param numberOfMeasurements - The number of measurements.
+ * @internal
  */
 export const updateMeasurementStatistics = (
   measurementStatistics: MeasurementStatistics,
   measurementRequirements: MeasurementStatisticsRequirements,
-  measurementValue: number,
-  numberOfMeasurements: number
+  measurementValue: number
 ): void => {
   if (measurementRequirements.aggregate) {
     measurementStatistics.aggregate =
@@ -172,13 +196,41 @@ export const updateMeasurementStatistics = (
       measurementValue,
       measurementStatistics.maximum ?? -Infinity
     )
-    if (measurementRequirements.average && numberOfMeasurements !== 0) {
-      measurementStatistics.average =
-        measurementStatistics.aggregate / numberOfMeasurements
-    }
-    if (measurementRequirements.median && measurementValue != null) {
+    if (
+      (measurementRequirements.average || measurementRequirements.median) &&
+      measurementValue != null
+    ) {
       measurementStatistics.history.push(measurementValue)
-      measurementStatistics.median = median(measurementStatistics.history)
+      if (measurementRequirements.average) {
+        measurementStatistics.average = average(measurementStatistics.history)
+      }
+      if (measurementRequirements.median) {
+        measurementStatistics.median = median(measurementStatistics.history)
+      }
+    }
+  }
+}
+
+/**
+ * Executes a function once at a time.
+ *
+ * @param fn - The function to execute.
+ * @param context - The context to bind the function to.
+ * @returns The function to execute.
+ */
+export const once = (
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  fn: (...args: any[]) => void,
+  context: unknown
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+): ((...args: any[]) => void) => {
+  let called = false
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  return function (...args: any[]): void {
+    if (!called) {
+      called = true
+      fn.apply(context, args)
+      called = false
     }
   }
 }