+ * @returns The key of the worker node.
+ * @throws {@link https://nodejs.org/api/errors.html#class-error} If after configured retries the worker node key is null or undefined.
+ * @throws {@link https://nodejs.org/api/errors.html#class-rangeerror} If the maximum consecutive worker choice strategy executions has been reached.
+ */
+ public execute (): number {
+ const workerChoiceStrategy = this.workerChoiceStrategies.get(
+ this.workerChoiceStrategy
+ ) as IWorkerChoiceStrategy
+ let workerNodeKey: number | undefined
+ const maxExecutionCount = 10000
+ let executionCount = 0
+ let chooseCount = 0
+ let retriesCount = 0
+ do {
+ if (workerChoiceStrategy.hasPoolWorkerNodesReady()) {
+ workerNodeKey = workerChoiceStrategy.choose()
+ if (chooseCount > 0) {
+ retriesCount++
+ }
+ chooseCount++
+ }
+ executionCount++
+ } while (
+ executionCount < maxExecutionCount &&
+ (!workerChoiceStrategy.hasPoolWorkerNodesReady() ||
+ (workerNodeKey == null && retriesCount < (this.opts.retries as number)))
+ )
+ if (executionCount >= maxExecutionCount) {
+ throw new RangeError(
+ `Worker choice strategy consecutive executions has exceeded the maximum of ${maxExecutionCount}`
+ )
+ }
+ if (workerNodeKey == null) {
+ throw new Error(
+ `Worker node key chosen is null or undefined after ${retriesCount} retries`
+ )
+ }
+ return workerNodeKey
+ }
+
+ /**
+ * Removes the worker node key from the worker choice strategy in the context.
+ *
+ * @param workerNodeKey - The worker node key.