@cloud-copilot/job/dist/esm/ConcurrentJobQueue.js

Async job runners with defined worker pools

/**
 * Creates a queue that runs jobs concurrently up to a specified limit.
 * This will wait for jobs to be added to it and run them up the
 * maximum concurrency.
 *
 * Results are available via `getResults()`.
 */
export class ConcurrentJobQueue {
    /**
     * Create a new runner with the specified concurrency.
     *
     * @param concurrency - The maximum number of jobs to run concurrently.
     */
    constructor(concurrency, logger) {
        this.concurrency = concurrency;
        this.logger = logger;
        this.queue = [];
        this.results = [];
        this.activeJobs = 0;
        this.waitingResolvers = [];
        this.workers = [];
        this.isAcceptingWork = true;
        this.workAvailablePromise = null;
        this.resolveWorkAvailable = null;
    }
    async worker(workerId) {
        while (this.isAcceptingWork || this.queue.length > 0) {
            const job = this.queue.shift();
            if (!job) {
                if (!this.isAcceptingWork) {
                    // No longer accepting work and no jobs left, exit immediately
                    return;
                }
                // No work available, wait for new work to be added
                await this.waitForWorkAvailable();
                continue;
            }
            this.activeJobs++;
            const context = { workerId };
            const startTime = Date.now();
            const interval = setInterval(() => {
                this.logger.warn(`Long-running job detected.`, { minutes: Math.floor((Date.now() - startTime) / 60000) }, { ...context, ...job.properties });
            }, 60000);
            try {
                const value = await job.execute({ ...context, properties: job.properties });
                this.results.push({ status: 'fulfilled', value, properties: job.properties });
            }
            catch (reason) {
                this.results.push({ status: 'rejected', reason, properties: job.properties });
            }
            finally {
                clearInterval(interval);
                this.activeJobs--;
                this.checkIfIdle();
            }
        }
    }
    waitForWorkAvailable() {
        if (!this.workAvailablePromise) {
            this.workAvailablePromise = new Promise((resolve) => {
                this.resolveWorkAvailable = resolve;
            });
        }
        return this.workAvailablePromise;
    }
    ensureWorkers() {
        if (this.workers.length === 0 && this.isAcceptingWork) {
            for (let i = 0; i < this.concurrency; i++) {
                this.workers.push(this.worker(i + 1));
            }
        }
    }
    notifyWorkersOfNewWork() {
        // Wake up waiting workers
        if (this.resolveWorkAvailable) {
            this.resolveWorkAvailable();
            this.workAvailablePromise = null;
            this.resolveWorkAvailable = null;
        }
    }
    checkIfIdle() {
        if (this.activeJobs === 0 && this.queue.length === 0) {
            // Notify all waiting resolvers
            this.waitingResolvers.forEach((resolve) => resolve());
            this.waitingResolvers = [];
        }
    }
    /**
     * Add a job to the queue
     */
    enqueue(job) {
        if (!this.isAcceptingWork) {
            throw new Error('Cannot enqueue jobs after shutdown');
        }
        this.queue.push(job);
        this.ensureWorkers();
        this.notifyWorkersOfNewWork();
    }
    /**
     * Add multiple jobs to the queue
     */
    enqueueAll(jobs) {
        jobs.forEach((job) => this.enqueue(job));
    }
    /**
     * Returns a promise that resolves when all queued work is complete
     */
    waitForIdle() {
        // log.debug('waitForIdle called', this.activeJobs, this.queue.length)
        return new Promise((resolve) => {
            if (this.activeJobs === 0 && this.queue.length === 0) {
                resolve();
            }
            else {
                this.waitingResolvers.push(resolve);
            }
        });
    }
    /**
     * Get all results accumulated so far
     */
    getResults() {
        return this.results;
    }
    /**
     * Shutdown the queue - no new jobs will be accepted, but existing jobs will complete.
     *
     * Returns when a promise that resolves when all jobs have been processed and
     * are available in `getResults()`.
     */
    async finishAllWork() {
        this.isAcceptingWork = false;
        // Wake up any sleeping workers so they can process remaining jobs or exit
        this.notifyWorkersOfNewWork();
        // Check if we're already idle and notify any waiting resolvers
        await Promise.all(this.workers);
        this.workers = [];
    }
    /**
     * Get the current queue length
     */
    get queueLength() {
        return this.queue.length;
    }
    /**
     * Get the number of currently active jobs
     */
    get activeJobCount() {
        return this.activeJobs;
    }
}
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