refactor: sensible defaults for worker choice strategy policy

[poolifier.git] / src / pools / selection-strategies / least-used-worker-choice-strategy.ts

diff --git a/src/pools/selection-strategies/least-used-worker-choice-strategy.ts b/src/pools/selection-strategies/least-used-worker-choice-strategy.ts
index 4161a1d266634518c5800d57a421acb46b690fe6..515b4e935db6e33fd5f3946c4f1b7cb0eb52a5f0 100644 (file)
--- a/src/pools/selection-strategies/least-used-worker-choice-strategy.ts
+++ b/src/pools/selection-strategies/least-used-worker-choice-strategy.ts
@@ -11,8 +11,8 @@ import type {
  * Selects the least used worker.
  *
  * @typeParam Worker - Type of worker which manages the strategy.
- * @typeParam Data - Type of data sent to the worker. This can only be serializable data.
- * @typeParam Response - Type of execution response. This can only be serializable data.
+ * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
+ * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
  */
 export class LeastUsedWorkerChoiceStrategy<
     Worker extends IWorker,
@@ -41,31 +41,37 @@ export class LeastUsedWorkerChoiceStrategy<
   }
 
   /** @inheritDoc */
-  public choose (): number {
-    const freeWorkerNodeKey = this.findFreeWorkerNodeKey()
-    if (freeWorkerNodeKey !== -1) {
-      return freeWorkerNodeKey
-    }
+  public choose (): number | undefined {
+    const chosenWorkerNodeKey = this.leastUsedNextWorkerNodeKey()
+    this.assignChosenWorkerNodeKey(chosenWorkerNodeKey)
+    return this.nextWorkerNodeKey
+  }
+
+  /** @inheritDoc */
+  public remove (): boolean {
+    return true
+  }
+
+  private leastUsedNextWorkerNodeKey (): number | undefined {
     let minNumberOfTasks = Infinity
-    let leastUsedWorkerNodeKey!: number
+    let chosenWorkerNodeKey: number | undefined
     for (const [workerNodeKey, workerNode] of this.pool.workerNodes.entries()) {
-      const workerTaskStatistics = workerNode.workerUsage.tasks
+      const workerTaskStatistics = workerNode.usage.tasks
       const workerTasks =
         workerTaskStatistics.executed +
         workerTaskStatistics.executing +
         workerTaskStatistics.queued
-      if (workerTasks === 0) {
-        return workerNodeKey
-      } else if (workerTasks < minNumberOfTasks) {
+      if (this.isWorkerNodeEligible(workerNodeKey) && workerTasks === 0) {
+        chosenWorkerNodeKey = workerNodeKey
+        break
+      } else if (
+        this.isWorkerNodeEligible(workerNodeKey) &&
+        workerTasks < minNumberOfTasks
+      ) {
         minNumberOfTasks = workerTasks
-        leastUsedWorkerNodeKey = workerNodeKey
+        chosenWorkerNodeKey = workerNodeKey
       }
     }
-    return leastUsedWorkerNodeKey
-  }
-
-  /** @inheritDoc */
-  public remove (): boolean {
-    return true
+    return chosenWorkerNodeKey
   }
 }