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import os from 'os';
import path from 'path';
import { Worker } from 'worker_threads';
const numCPUs = os.cpus().length;
class WorkerPool<I, O> {
private workers: Worker[] = [];
constructor(
private workerFile: string,
private numWorkers: number = numCPUs,
) {
for (let i = 0; i < this.numWorkers; i++) {
const worker = new Worker(path.join(__dirname, this.workerFile), {
execArgv: ['-r', 'ts-node/register'],
});
worker.on('error', (err) => {
console.error('Worker error:', err);
});
worker.on('exit', (code) => {
if (code !== 0) {
console.warn(`Worker exited with code ${code}`);
}
});
this.workers.push(worker);
}
}
/** This method distributes the task to a free worker and returns a promise with the result. */
execute(data: I): Promise<O> {
return new Promise((resolve, reject) => {
const worker = this.workers.pop();
if (!worker) {
reject('No-available-workers.');
return;
}
worker.once('message', (message: O) => {
resolve(message);
this.workers.push(worker); // Return worker to the pool
});
worker.postMessage(data);
});
}
/** This method distributes the task to all available workers and returns a promise with the results. */
executeAll(data: I): Promise<O[]> {
return Promise.all(this.workers.map(() => this.execute(data)));
}
}
export default WorkerPool;
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