basant307/AI_Governance_Project

1"use strict";2 3// rawAsap provides everything we need except exception management.4var rawAsap = require("./raw");5// RawTasks are recycled to reduce GC churn.6var freeTasks = [];7// We queue errors to ensure they are thrown in right order (FIFO).8// Array-as-queue is good enough here, since we are just dealing with exceptions.9var pendingErrors = [];10var requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError);11 12function throwFirstError() {13    if (pendingErrors.length) {14        throw pendingErrors.shift();15    }16}17 18/**19 * Calls a task as soon as possible after returning, in its own event, with priority20 * over other events like animation, reflow, and repaint. An error thrown from an21 * event will not interrupt, nor even substantially slow down the processing of22 * other events, but will be rather postponed to a lower priority event.23 * @param {{call}} task A callable object, typically a function that takes no24 * arguments.25 */26module.exports = asap;27function asap(task) {28    var rawTask;29    if (freeTasks.length) {30        rawTask = freeTasks.pop();31    } else {32        rawTask = new RawTask();33    }34    rawTask.task = task;35    rawAsap(rawTask);36}37 38// We wrap tasks with recyclable task objects.  A task object implements39// `call`, just like a function.40function RawTask() {41    this.task = null;42}43 44// The sole purpose of wrapping the task is to catch the exception and recycle45// the task object after its single use.46RawTask.prototype.call = function () {47    try {48        this.task.call();49    } catch (error) {50        if (asap.onerror) {51            // This hook exists purely for testing purposes.52            // Its name will be periodically randomized to break any code that53            // depends on its existence.54            asap.onerror(error);55        } else {56            // In a web browser, exceptions are not fatal. However, to avoid57            // slowing down the queue of pending tasks, we rethrow the error in a58            // lower priority turn.59            pendingErrors.push(error);60            requestErrorThrow();61        }62    } finally {63        this.task = null;64        freeTasks[freeTasks.length] = this;65    }66};67