+ /**
+ * Worker message listener.
+ *
+ * @param message - Message received.
+ */
+ protected messageListener (message: MessageValue<Data, Data>): void {
+ if (message.ready != null && message.workerId === this.id) {
+ // Startup message received
+ this.workerReady()
+ } else if (message.statistics != null && message.workerId === this.id) {
+ // Statistics message received
+ this.statistics = message.statistics
+ } else if (message.checkAlive != null && message.workerId === this.id) {
+ // Check alive message received
+ message.checkAlive ? this.startCheckAlive() : this.stopCheckAlive()
+ } else if (
+ message.id != null &&
+ message.data != null &&
+ message.workerId === this.id
+ ) {
+ // Task message received
+ const fn = this.getTaskFunction(message.name)
+ if (isAsyncFunction(fn)) {
+ this.runInAsyncScope(this.runAsync.bind(this), this, fn, message)
+ } else {
+ this.runInAsyncScope(this.runSync.bind(this), this, fn, message)
+ }
+ } else if (message.kill === true && message.workerId === this.id) {
+ // Kill message received
+ this.stopCheckAlive()
+ this.emitDestroy()
+ }
+ }
+
+ /**
+ * Notifies the main worker that this worker is ready to process tasks.
+ */
+ protected workerReady (): void {
+ !this.isMain && this.sendToMainWorker({ ready: true, workerId: this.id })
+ }
+
+ /**
+ * Starts the worker alive check interval.
+ */
+ private startCheckAlive (): void {
+ this.lastTaskTimestamp = performance.now()
+ this.aliveInterval = setInterval(
+ this.checkAlive.bind(this),
+ (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2
+ )
+ this.checkAlive.bind(this)()
+ }
+
+ /**
+ * Stops the worker alive check interval.
+ */
+ private stopCheckAlive (): void {
+ this.aliveInterval != null && clearInterval(this.aliveInterval)
+ }