+ * @param message - The received message.
+ */
+ protected messageListener (message: MessageValue<Data, Data>): void {
+ if (message.workerId === this.id) {
+ if (message.ready != null) {
+ // Startup message received
+ this.sendReadyResponse()
+ } else if (message.statistics != null) {
+ // Statistics message received
+ this.statistics = message.statistics
+ } else if (message.checkActive != null) {
+ // Check active message received
+ message.checkActive ? this.startCheckActive() : this.stopCheckActive()
+ } else if (message.id != null && message.data != null) {
+ // Task message received
+ this.run(message)
+ } else if (message.kill === true) {
+ // Kill message received
+ this.stopCheckActive()
+ this.emitDestroy()
+ }
+ }
+ }
+
+ /**
+ * Sends to the main worker the ready response.
+ */
+ protected sendReadyResponse (): void {
+ !this.isMain && this.sendToMainWorker({ ready: true, workerId: this.id })
+ }
+
+ /**
+ * Starts the worker check active interval.
+ */
+ private startCheckActive (): void {
+ this.lastTaskTimestamp = performance.now()
+ this.activeInterval = setInterval(
+ this.checkActive.bind(this),
+ (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2
+ )
+ }
+
+ /**
+ * Stops the worker check active interval.