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<!DOCTYPE html>
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<title>JSDoc: Source: lib/core/reactive/scheduler.js</title>
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<h1 class="page-title">Source: lib/core/reactive/scheduler.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>const queue = [];
const flushCallbacks = [];
let isPending = false;
let isFlushing = false;
import { logger } from '../runtime/AvenxLogger.js';
/**
* Queues a job (update callback) to be executed in the next microtask.
* Deduplicates multiple calls to the same job.
* @param {Function} job - The callback to run.
*/
export function queueJob(job) {
if (!queue.includes(job)) {
queue.push(job);
queueFlush();
}
}
/**
* Queues a callback to run after the current flush cycle has finished.
* @param {Function} cb - The callback to run.
*/
export function queueFlushCallback(cb) {
if (!flushCallbacks.includes(cb)) {
flushCallbacks.push(cb);
queueFlush();
}
}
/**
* Schedules a flush cycle in a deferred microtask.
*/
function queueFlush() {
if (!isPending && !isFlushing) {
isPending = true;
Promise.resolve().then(() => {
Promise.resolve().then(flushJobs);
});
}
}
/**
* Flushes all queued jobs in a loop until the queue is completely empty.
* Jobs are strictly ordered by their `id` property ascending (e.g. component uid)
* to ensure parent components update before their child components.
* After jobs are flushed, all queued flush callbacks (e.g. nextTick) are executed.
*/
function flushJobs() {
isPending = false;
isFlushing = true;
try {
// 1. Flush jobs first
while (queue.length > 0) {
// Sort jobs by their id ascending (e.g. parent uid < child uid)
queue.sort((a, b) => (a.id || 0) - (b.id || 0));
const job = queue.shift();
try {
job();
} catch (error) {
logger.error('Error executing scheduled job:', error);
}
}
// 2. Flush callbacks
const callbacks = flushCallbacks.slice();
flushCallbacks.length = 0;
for (const cb of callbacks) {
try {
cb();
} catch (error) {
logger.error('Error executing flush callback:', error);
}
}
// 3. Re-flush if executing callbacks or jobs queued more jobs or callbacks
if (queue.length > 0 || flushCallbacks.length > 0) {
flushJobs();
}
} finally {
isFlushing = false;
}
}
/**
* Executes a callback (or resolves a Promise) after all currently queued
* jobs in the scheduler queue have finished flushing.
* @param {Function} [callback] - Optional callback to invoke after the flush.
* @returns {Promise<void>|void} A promise resolving after the flush, if no callback was given.
*/
export function nextTick(callback) {
if (callback) {
queueFlushCallback(callback);
return;
}
return new Promise((resolve) => {
queueFlushCallback(resolve);
});
}
</code></pre>
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