feat: untangle worker choice strategies tasks distribution and dynamic worker creatio...

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

diff --git a/src/pools/selection-strategies/round-robin-worker-choice-strategy.ts b/src/pools/selection-strategies/round-robin-worker-choice-strategy.ts
index 76cdd4abac3ff7a2c5a5988cf76e66d87ab9be9b..41bc4085ebd5a1399975e48e873fc0612c6a611c 100644 (file)
--- a/src/pools/selection-strategies/round-robin-worker-choice-strategy.ts
+++ b/src/pools/selection-strategies/round-robin-worker-choice-strategy.ts
@@ -1,36 +1,80 @@
-import type { IPoolWorker } from '../pool-worker'
+import { DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS } from '../../utils'
+import type { IPool } from '../pool'
+import type { IWorker } from '../worker'
 import { AbstractWorkerChoiceStrategy } from './abstract-worker-choice-strategy'
+import type {
+  IWorkerChoiceStrategy,
+  StrategyPolicy,
+  WorkerChoiceStrategyOptions
+} from './selection-strategies-types'
 
 /**
  * Selects the next worker in a round robin fashion.
  *
  * @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 response of execution. 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 RoundRobinWorkerChoiceStrategy<
-  Worker extends IPoolWorker,
-  Data,
-  Response
-> extends AbstractWorkerChoiceStrategy<Worker, Data, Response> {
-  /**
-   * Index for the next worker.
-   */
-  private nextWorkerIndex: number = 0
+    Worker extends IWorker,
+    Data = unknown,
+    Response = unknown
+  >
+  extends AbstractWorkerChoiceStrategy<Worker, Data, Response>
+  implements IWorkerChoiceStrategy {
+  /** @inheritDoc */
+  public readonly strategyPolicy: StrategyPolicy = {
+    dynamicWorkerUsage: false,
+    dynamicWorkerReady: true
+  }
+
+  /** @inheritDoc */
+  public constructor (
+    pool: IPool<Worker, Data, Response>,
+    opts: WorkerChoiceStrategyOptions = DEFAULT_WORKER_CHOICE_STRATEGY_OPTIONS
+  ) {
+    super(pool, opts)
+    this.setTaskStatisticsRequirements(this.opts)
+  }
 
-  /** {@inheritDoc} */
+  /** @inheritDoc */
   public reset (): boolean {
-    this.nextWorkerIndex = 0
+    this.nextWorkerNodeKey = 0
+    return true
+  }
+
+  /** @inheritDoc */
+  public update (): boolean {
+    return true
+  }
+
+  /** @inheritDoc */
+  public choose (): number | undefined {
+    const chosenWorkerNodeKey = this.nextWorkerNodeKey
+    this.roundRobinNextWorkerNodeKey()
+    if (!this.isWorkerNodeEligible(this.nextWorkerNodeKey as number)) {
+      this.nextWorkerNodeKey = undefined
+    }
+    return chosenWorkerNodeKey
+  }
+
+  /** @inheritDoc */
+  public remove (workerNodeKey: number): boolean {
+    if (this.nextWorkerNodeKey === workerNodeKey) {
+      if (this.pool.workerNodes.length === 0) {
+        this.nextWorkerNodeKey = 0
+      } else if (this.nextWorkerNodeKey > this.pool.workerNodes.length - 1) {
+        this.nextWorkerNodeKey = this.pool.workerNodes.length - 1
+      }
+    }
     return true
   }
 
-  /** {@inheritDoc} */
-  public choose (): Worker {
-    const chosenWorker = this.pool.workers[this.nextWorkerIndex]
-    this.nextWorkerIndex =
-      this.nextWorkerIndex === this.pool.workers.length - 1
+  private roundRobinNextWorkerNodeKey (): number | undefined {
+    this.nextWorkerNodeKey =
+      this.nextWorkerNodeKey === this.pool.workerNodes.length - 1
         ? 0
-        : this.nextWorkerIndex + 1
-    return chosenWorker
+        : (this.nextWorkerNodeKey ?? 0) + 1
+    return this.nextWorkerNodeKey
   }
 }