FreightHub Coding Challenge

note.txt

1) I had first implemented  the requirement with both classes in the same file. however, when I split them into dedifferent modules,
I had some issue running it on browser since both `commonJS` and `amd` could import/define  to bundle the module.
So, I have mae some google search and I came across `systemJs` module loader, that fixed my issue in browser.

2) About the following requirement `Also make sure that the executions of updateShipment with the same id never run concurrently`.
I wasn't to share if the requirement was to pause the execution of the function and wait until the promise is returned ( I implemented that with async await).
Or it was a request to check the `id value` of the coming update (which I dont implement).

Should you have any technical questions about my submittion, please let me know.

Thank you!!!

shipmentSearchIndex.ts

async function sleep(ms: number) {
  return new Promise((resolve, reject) => {
    setTimeout(() => resolve(), ms)
  })
}

async function randomDelay() {
  const randomTime = Math.round(Math.random() * 1000)
  return sleep(randomTime)
}

export default class ShipmentSearchIndex {
  async updateShipment(id: string, shipmentData: any) {
    const startTime = new Date()
    await randomDelay()
    const endTime = new Date()
    console.log(`update ${id}@${
      startTime.toISOString()
      } finished@${
      endTime.toISOString()
      }`
    )

    return { startTime, endTime }
  }
}

shipmentUpdateListener.ts

import ShipmentSearchIndex from './shipmentSearchIndex'

interface ShipmentUpdateListenerInterface {
  receiveUpdate(id: string, shipmentData: any): void;
}

class ShipmentUpdateListener extends ShipmentSearchIndex implements ShipmentUpdateListenerInterface {
  async receiveUpdate(id: string, shipmentData: any) {
    await this.updateShipment(id, shipmentData)
  }
}