refactor: sensible defaults for worker choice strategy policy

[poolifier.git] / src / pools / selection-strategies / weighted-round-robin-worker-choice-strategy.ts

diff --git a/src/pools/selection-strategies/weighted-round-robin-worker-choice-strategy.ts b/src/pools/selection-strategies/weighted-round-robin-worker-choice-strategy.ts
index 926900800272fef430ddf68273dcb2992954a85a..78ad7485dcc58ddb8c65ebb946fcdc6a34b92f5d 100644 (file)
--- a/src/pools/selection-strategies/weighted-round-robin-worker-choice-strategy.ts
+++ b/src/pools/selection-strategies/weighted-round-robin-worker-choice-strategy.ts
@@ -1,10 +1,12 @@
 import type { IWorker } from '../worker'
 import type { IPool } from '../pool'
-import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils'
+import {
+  DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+  DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+} from '../../utils'
 import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
 import type {
   IWorkerChoiceStrategy,
-  StrategyPolicy,
   TaskStatisticsRequirements,
   WorkerChoiceStrategyOptions
 } from './selection-strategies-types'
@@ -24,11 +26,6 @@ export class WeightedRoundRobinWorkerChoiceStrategy<
   >
   extends AbstractWorkerChoiceStrategy<Worker, Data, Response>
   implements IWorkerChoiceStrategy {
-  /** @inheritDoc */
-  public readonly strategyPolicy: StrategyPolicy = {
-    useDynamicWorker: true
-  }
-
   /** @inheritDoc */
   public readonly taskStatisticsRequirements: TaskStatisticsRequirements = {
     runTime: {
@@ -36,16 +33,8 @@ export class WeightedRoundRobinWorkerChoiceStrategy<
       average: true,
       median: false
     },
-    waitTime: {
-      aggregate: false,
-      average: false,
-      median: false
-    },
-    elu: {
-      aggregate: false,
-      average: false,
-      median: false
-    }
+    waitTime: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS,
+    elu: DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS
   }
 
   /**
@@ -69,7 +58,7 @@ export class WeightedRoundRobinWorkerChoiceStrategy<
 
   /** @inheritDoc */
   public reset (): boolean {
-    this.nextWorkerNodeId = 0
+    this.nextWorkerNodeKey = 0
     this.workerVirtualTaskRunTime = 0
     return true
   }
@@ -80,35 +69,49 @@ export class WeightedRoundRobinWorkerChoiceStrategy<
   }
 
   /** @inheritDoc */
-  public choose (): number {
-    const chosenWorkerNodeKey = this.nextWorkerNodeId
-    const workerVirtualTaskRunTime = this.workerVirtualTaskRunTime
-    const workerWeight =
-      this.opts.weights?.[chosenWorkerNodeKey] ?? this.defaultWorkerWeight
-    if (workerVirtualTaskRunTime < workerWeight) {
-      this.workerVirtualTaskRunTime =
-        workerVirtualTaskRunTime +
-        this.getWorkerTaskRunTime(chosenWorkerNodeKey)
-    } else {
-      this.nextWorkerNodeId =
-        this.nextWorkerNodeId === this.pool.workerNodes.length - 1
-          ? 0
-          : this.nextWorkerNodeId + 1
-      this.workerVirtualTaskRunTime = 0
+  public choose (): number | undefined {
+    const chosenWorkerNodeKey = this.nextWorkerNodeKey
+    this.weightedRoundRobinNextWorkerNodeKey()
+    if (!this.isWorkerNodeEligible(this.nextWorkerNodeKey as number)) {
+      this.nextWorkerNodeKey = undefined
+      this.previousWorkerNodeKey =
+        chosenWorkerNodeKey ?? this.previousWorkerNodeKey
     }
     return chosenWorkerNodeKey
   }
 
   /** @inheritDoc */
   public remove (workerNodeKey: number): boolean {
-    if (this.nextWorkerNodeId === workerNodeKey) {
+    if (this.nextWorkerNodeKey === workerNodeKey) {
       if (this.pool.workerNodes.length === 0) {
-        this.nextWorkerNodeId = 0
-      } else if (this.nextWorkerNodeId > this.pool.workerNodes.length - 1) {
-        this.nextWorkerNodeId = this.pool.workerNodes.length - 1
+        this.nextWorkerNodeKey = 0
+      } else if (this.nextWorkerNodeKey > this.pool.workerNodes.length - 1) {
+        this.nextWorkerNodeKey = this.pool.workerNodes.length - 1
       }
       this.workerVirtualTaskRunTime = 0
     }
     return true
   }
+
+  private weightedRoundRobinNextWorkerNodeKey (): number | undefined {
+    const workerVirtualTaskRunTime = this.workerVirtualTaskRunTime
+    const workerWeight =
+      this.opts.weights?.[
+        this.nextWorkerNodeKey ?? this.previousWorkerNodeKey
+      ] ?? this.defaultWorkerWeight
+    if (workerVirtualTaskRunTime < workerWeight) {
+      this.workerVirtualTaskRunTime =
+        workerVirtualTaskRunTime +
+        this.getWorkerTaskRunTime(
+          this.nextWorkerNodeKey ?? this.previousWorkerNodeKey
+        )
+    } else {
+      this.nextWorkerNodeKey =
+        this.nextWorkerNodeKey === this.pool.workerNodes.length - 1
+          ? 0
+          : (this.nextWorkerNodeKey ?? this.previousWorkerNodeKey) + 1
+      this.workerVirtualTaskRunTime = 0
+    }
+    return this.nextWorkerNodeKey
+  }
 }