dbd.db/lib/json/jsonPool.js

A Lightweight Schema-Free Object-Oriented LocalDatabase for Development and Production Purpose

const WorkerPool = require('workerpool')

class JsonPool {
	constructor() {
		this.pool = WorkerPool.pool(
			__dirname + '/jsonScript.js', {
			maxWorkers: process.env.MAX_WORKER_THREADS || 3,
			workerType: 'thread'
		})

		this.terminating = false
	}

	parse(data) {
		return this.pool.exec('parse', [data]).then(res => {
			if (!this.pool.tasks.length && !this.terminating) {
				this.terminating = true

				this.pool.terminate()
					.then(() => (this.terminating = false))
					.catch(() => (this.terminating = false))
			}

			return res
		}).catch(rej => {
			if (!this.pool.tasks.length && !this.terminating) {
				this.terminating = true

				this.pool.terminate()
					.then(() => (this.terminating = false))
					.catch(() => (this.terminating = false))
			}

			throw rej
		})
	}

	stringify(data) {
		return this.pool.exec('stringify', [data]).then(res => {
			if (!this.pool.tasks.length && !this.terminating) {
				this.terminating = true

				this.pool.terminate()
					.then(() => (this.terminating = false))
					.catch(() => (this.terminating = false))
			}

			return res
		}).catch(rej => {
			if (!this.pool.tasks.length && !this.terminating) {
				this.terminating = true

				this.pool.terminate()
					.then(() => (this.terminating = false))
					.catch(() => (this.terminating = false))
			}

			throw rej
		})
	}
}

module.exports = JsonPool