@jbrowse/core/esm/util/stopToken.js

JBrowse 2 core libraries used by plugins

import { isWebWorker } from "./isWebWorker.js";
export function createStopTokenChecker(stopToken) {
    return {
        time: Date.now(),
        iters: 0,
        stopToken,
    };
}
export function createStopToken() {
    return URL.createObjectURL?.(new Blob()) || `${Math.random()}`;
}
function isSharedArrayBuffer(value) {
    try {
        return (typeof SharedArrayBuffer !== 'undefined' &&
            value instanceof SharedArrayBuffer);
    }
    catch {
        return false;
    }
}
export function stopStopToken(stopToken) {
    if (stopToken !== undefined) {
        if (isSharedArrayBuffer(stopToken)) {
            Atomics.store(new Int32Array(stopToken), 0, 1);
        }
        else {
            URL.revokeObjectURL?.(stopToken);
        }
    }
}
export function checkStopToken(stopToken) {
    if (stopToken === undefined) {
        return;
    }
    if (isSharedArrayBuffer(stopToken)) {
        if (Atomics.load(new Int32Array(stopToken), 0) === 1) {
            throw new Error('aborted');
        }
    }
    else if (typeof jest === 'undefined' && isWebWorker()) {
        const xhr = new XMLHttpRequest();
        xhr.open('GET', stopToken, false);
        try {
            xhr.send(null);
        }
        catch {
            throw new Error('aborted');
        }
    }
}
export function checkStopToken2(lastCheck) {
    if (!lastCheck) {
        return;
    }
    const { stopToken, backoff = true, checkInterval = 50, checkIters = 100, } = lastCheck;
    lastCheck.iters++;
    if (stopToken === undefined) {
        return;
    }
    if (lastCheck.iters % checkIters !== 0) {
        return;
    }
    if (isSharedArrayBuffer(stopToken)) {
        checkStopToken(stopToken);
    }
    const now = Date.now();
    if (now - lastCheck.time > checkInterval) {
        lastCheck.time = now;
        checkStopToken(stopToken);
        if (backoff) {
            lastCheck.checkInterval ??= checkInterval;
            lastCheck.checkInterval += checkInterval;
        }
    }
}
export function forEachWithStopTokenCheck(iter, stopToken, arg, durationMs = 400, checkIters = 100, backoff = true) {
    const lastCheck = {
        time: Date.now(),
        iters: 0,
        checkInterval: durationMs,
        backoff,
        checkIters,
        stopToken,
    };
    let iters = 0;
    for (const t of iter) {
        arg(t, iters++);
        checkStopToken2(lastCheck);
    }
}