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JSApp.js

JSTaskScheduler.js

Question Description

Priority Task Scheduler

Implement a TaskScheduler class that runs asynchronous tasks with bounded concurrency and priority ordering. Higher-priority tasks must always execute before lower-priority ones when a worker slot opens up. Failed tasks should be automatically retried up to the configured limit before being rejected. The scheduler must never exceed the concurrency cap.

Detailed Requirements

1.schedule(task, { priority }) enqueues an async function and returns a Promise that resolves or rejects with the task's result.

2.Tasks with priority HIGH (3) run before NORMAL (2), which run before LOW (1). Tasks of equal priority are FIFO.

3.At most concurrency tasks may run simultaneously; additional tasks wait in the priority queue.

4.If a task throws, retry it up to retries times before finally rejecting the returned Promise.

5.cancel(taskRef) removes a not-yet-started task from the queue and returns true, or false if it is already running or finished.

1// TaskScheduler.js
2 
3const PRIORITY = { HIGH: 3, NORMAL: 2, LOW: 1 };
4 
5class TaskScheduler {
6  constructor({ concurrency = 4, retries = 2 } = {}) {
7    this.concurrency = concurrency;
8    this.retries     = retries;
9    this._queue      = [];   // pending { task, priority, resolve, reject, attempts }
10    this._running    = 0;
11    this._completed  = 0;
12    this._failed     = 0;
13  }
14 
15  schedule(task, { priority = PRIORITY.NORMAL } = {}) {
16    // TODO: wrap task in a Promise, push onto _queue (sorted by priority desc)
17    //       call this._drain() to kick off execution
18  }
19 
20  cancel(taskRef) {
21    // TODO: splce taskRef from _queue if not yet running
22    //       return true if removed, false otherwise
23  }
24 
25  async _drain() {
26    // TODO: while _running < concurrency and _queue non-empty:
27    //   dequeue highest-priority item, increment _running
28    //   execute task(); on success → resolve, on failure → retry or reject
29    //   decrement _running, call _drain() again
30  }
31 
32  get stats() {
33    // TODO: return { queued, running, completed, failed }
34  }
35}
36 
37module.exports = { TaskScheduler, PRIORITY };

Ln 1, Col 1Spaces: 2

UTF-8LF{} JavaScript

JSApp.js

JSTaskScheduler.js

Question Description

Priority Task Scheduler

Detailed Requirements

1.schedule(task, { priority }) enqueues an async function and returns a Promise that resolves or rejects with the task's result.

2.Tasks with priority HIGH (3) run before NORMAL (2), which run before LOW (1). Tasks of equal priority are FIFO.

3.At most concurrency tasks may run simultaneously; additional tasks wait in the priority queue.

4.If a task throws, retry it up to retries times before finally rejecting the returned Promise.

5.cancel(taskRef) removes a not-yet-started task from the queue and returns true, or false if it is already running or finished.

1// TaskScheduler.js
2 
3const PRIORITY = { HIGH: 3, NORMAL: 2, LOW: 1 };
4 
5class TaskScheduler {
6  constructor({ concurrency = 4, retries = 2 } = {}) {
7    this.concurrency = concurrency;
8    this.retries     = retries;
9    this._queue      = [];   // pending { task, priority, resolve, reject, attempts }
10    this._running    = 0;
11    this._completed  = 0;
12    this._failed     = 0;
13  }
14 
15  schedule(task, { priority = PRIORITY.NORMAL } = {}) {
16    // TODO: wrap task in a Promise, push onto _queue (sorted by priority desc)
17    //       call this._drain() to kick off execution
18  }
19 
20  cancel(taskRef) {
21    // TODO: splce taskRef from _queue if not yet running
22    //       return true if removed, false otherwise
23  }
24 
25  async _drain() {
26    // TODO: while _running < concurrency and _queue non-empty:
27    //   dequeue highest-priority item, increment _running
28    //   execute task(); on success → resolve, on failure → retry or reject
29    //   decrement _running, call _drain() again
30  }
31 
32  get stats() {
33    // TODO: return { queued, running, completed, failed }
34  }
35}
36 
37module.exports = { TaskScheduler, PRIORITY };

Ln 1, Col 1Spaces: 2

UTF-8LF{} JavaScript

Listening

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How would you make sure that if two tasks have the same priority, they still execute in the order they were scheduled?

I'd attach a monotonically increasing sequence number to each entry when it's pushed, so the queue entry becomes { task, priority, seq, resolve, reject, attempts }. Then the sort comparator first compares by priority descending, and breaks ties by seq ascending. That guarantees strict FIFO within the same priority level without any extra data structures.

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