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const {
ReflectConstruct,
SafeMap,
Symbol,
} = primordials;
const {
codes: {
ERR_ILLEGAL_CONSTRUCTOR,
ERR_INVALID_THIS,
}
} = require('internal/errors');
const {
createELDHistogram,
} = internalBinding('performance');
const {
validateInteger,
validateObject,
} = require('internal/validators');
const {
Histogram,
kHandle,
kMap,
} = require('internal/histogram');
const {
kEmptyObject,
} = require('internal/util');
const {
makeTransferable,
} = require('internal/worker/js_transferable');
const kEnabled = Symbol('kEnabled');
class ELDHistogram extends Histogram {
constructor(i) {
throw new ERR_ILLEGAL_CONSTRUCTOR();
}
/**
* @returns {boolean}
*/
enable() {
if (this[kEnabled] === undefined)
throw new ERR_INVALID_THIS('ELDHistogram');
if (this[kEnabled]) return false;
this[kEnabled] = true;
this[kHandle].start();
return true;
}
/**
* @returns {boolean}
*/
disable() {
if (this[kEnabled] === undefined)
throw new ERR_INVALID_THIS('ELDHistogram');
if (!this[kEnabled]) return false;
this[kEnabled] = false;
this[kHandle].stop();
return true;
}
}
/**
* @param {{
* resolution : number
* }} [options]
* @returns {ELDHistogram}
*/
function monitorEventLoopDelay(options = kEmptyObject) {
validateObject(options, 'options');
const { resolution = 10 } = options;
validateInteger(resolution, 'options.resolution', 1);
return makeTransferable(ReflectConstruct(
function() {
this[kEnabled] = false;
this[kHandle] = createELDHistogram(resolution);
this[kMap] = new SafeMap();
}, [], ELDHistogram));
}
module.exports = monitorEventLoopDelay;
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