+
+ static insertAt = (str: string, subStr: string, pos: number): string => `${str.slice(0, pos)}${subStr}${str.slice(pos)}`;
+
+ /**
+ * @param [retryNumber=0]
+ * @returns delay in milliseconds
+ */
+ static exponentialDelay(retryNumber = 0): number {
+ const delay = Math.pow(2, retryNumber) * 100;
+ const randomSum = delay * 0.2 * Math.random(); // 0-20% of the delay
+ return delay + randomSum;
+ }
+
+ /**
+ * Convert websocket error code to human readable string message
+ *
+ * @param code websocket error code
+ * @returns human readable string message
+ */
+ static getWebSocketCloseEventStatusString(code: number): string {
+ if (code >= 0 && code <= 999) {
+ return '(Unused)';
+ } else if (code >= 1016) {
+ if (code <= 1999) {
+ return '(For WebSocket standard)';
+ } else if (code <= 2999) {
+ return '(For WebSocket extensions)';
+ } else if (code <= 3999) {
+ return '(For libraries and frameworks)';
+ } else if (code <= 4999) {
+ return '(For applications)';
+ }
+ }
+ if (!Utils.isUndefined(WebSocketCloseEventStatusString[code])) {
+ return WebSocketCloseEventStatusString[code] as string;
+ }
+ return '(Unknown)';
+ }
+
+ static workerPoolInUse(): boolean {
+ return [WorkerProcessType.DYNAMIC_POOL, WorkerProcessType.STATIC_POOL].includes(Configuration.getWorkerProcess());
+ }
+
+ static workerDynamicPoolInUse(): boolean {
+ return Configuration.getWorkerProcess() === WorkerProcessType.DYNAMIC_POOL;
+ }