+ /**
+ * Registers a listener callback on the given worker.
+ *
+ * @param worker - The worker which should register a listener.
+ * @param listener - The message listener callback.
+ */
+ protected abstract registerWorkerMessageListener<
+ Message extends Data | Response
+ >(worker: Worker, listener: (message: MessageValue<Message>) => void): void
+
+ /**
+ * Function that can be hooked up when a worker has been newly created and moved to the pool worker nodes.
+ * Can be overridden.
+ *
+ * @param worker - The newly created worker.
+ */
+ protected afterWorkerSetup (worker: Worker): void {
+ // Listen to worker messages.
+ this.registerWorkerMessageListener(worker, this.workerListener())
+ // Send the startup message to worker.
+ this.sendStartupMessageToWorker(worker)
+ // Setup worker task statistics computation.
+ this.setWorkerStatistics(worker)
+ }
+
+ /**
+ * Sends the startup message to the given worker.
+ *
+ * @param worker - The worker which should receive the startup message.
+ */
+ protected abstract sendStartupMessageToWorker (worker: Worker): void
+
+ private redistributeQueuedTasks (workerNodeKey: number): void {
+ while (this.tasksQueueSize(workerNodeKey) > 0) {
+ let targetWorkerNodeKey: number = workerNodeKey
+ let minQueuedTasks = Infinity
+ for (const [workerNodeId, workerNode] of this.workerNodes.entries()) {
+ const workerInfo = this.getWorkerInfo(workerNodeId)
+ if (
+ workerNodeId !== workerNodeKey &&
+ workerInfo.ready &&
+ workerNode.usage.tasks.queued === 0
+ ) {
+ targetWorkerNodeKey = workerNodeId
+ break
+ }
+ if (
+ workerNodeId !== workerNodeKey &&
+ workerInfo.ready &&
+ workerNode.usage.tasks.queued < minQueuedTasks
+ ) {
+ minQueuedTasks = workerNode.usage.tasks.queued
+ targetWorkerNodeKey = workerNodeId
+ }
+ }
+ this.enqueueTask(
+ targetWorkerNodeKey,
+ this.dequeueTask(workerNodeKey) as Task<Data>
+ )
+ }
+ }
+