twilio-video
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Twilio Video JavaScript Library
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JavaScript
/**
* @fileOverview
* Custom Compute Pressure monitor using the Compute Pressure API.
* @internal
*/
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g = Object.create((typeof Iterator === "function" ? Iterator : Object).prototype);
return g.next = verb(0), g["throw"] = verb(1), g["return"] = verb(2), typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
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op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
/**
* @typedef {'cpu' | 'gpu'} PressureSource
* @typedef {'nominal' | 'fair' | 'serious' | 'critical'} PressureState
*
* NOTE(lrivas): Remove once we update to a TypeScript version with definitions for the Compute Pressure API types.
*/
/**
* @typedef {{
* source: PressureSource,
* state: PressureState,
* time: DOMHighResTimeStamp
* }} PressureRecord
*/
/**
* @typedef {{ sampleInterval?: number }} PressureObserverOptions
*/
/**
* @callback PressureObserverCallback
* @param {PressureRecord[]} records
* @param {PressureObserver} observer
*/
/**
* @typedef {{
* disconnect(): void,
* observe(source: PressureSource, options?: PressureObserverOptions): Promise<void>,
* unobserve(source: PressureSource): void,
* takeRecords(): PressureRecord[]
* }} PressureObserver
*/
/**
* @typedef {new (callback: PressureObserverCallback) => PressureObserver} PressureObserverConstructor
*/
/**
* @callback PressureChangeCallback
* @param {PressureRecord} record
* @returns {void}
*/
/**
* Helper to get the PressureObserver constructor from the global scope.
* @returns {PressureObserverConstructor | null}
*/
function getPressureObserver() {
if (typeof globalThis !== 'undefined' && typeof globalThis.PressureObserver === 'function') {
return /** @type {PressureObserverConstructor} */ (globalThis.PressureObserver);
}
return null;
}
var ComputePressureMonitor = /** @class */ (function () {
function ComputePressureMonitor() {
/** @type {PressureState | null} */
this._lastCpuPressure = null;
/** @type {PressureObserver | null} */
this._cpuPressureObserver = null;
/** @type {number} */
this._sampleInterval = 2000; // 2 seconds
/** @type {PressureChangeCallback[]} */
this._cpuPressureChangeListeners = [];
/** @type {PressureObserverConstructor | null} */
}
/**
* Start watching CPU pressure changes. This is an asynchronous operation.
* @param {PressureChangeCallback} callback - The callback function to call when the pressure changes.
* @returns {Promise<void>}
*/
ComputePressureMonitor.prototype.watchCpuPressure = function (callback) {
return __awaiter(this, void 0, void 0, function () {
var PressureObserver;
var _this = this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (typeof callback !== 'function') {
throw new Error('The CPU pressure change callback must be a function');
}
PressureObserver = getPressureObserver();
if (!PressureObserver) {
throw new Error('PressureObserver is not supported in this environment');
}
this._cpuPressureChangeListeners.push(callback);
if (!!this._cpuPressureObserver) return [3 /*break*/, 2];
this._cpuPressureObserver = new PressureObserver(function (records) { return _this._handleCpuPressureRecords(records); });
return [4 /*yield*/, this._cpuPressureObserver.observe('cpu', {
sampleInterval: this._sampleInterval,
})];
case 1:
_a.sent();
_a.label = 2;
case 2: return [2 /*return*/];
}
});
});
};
/**
* @returns {boolean}
*/
ComputePressureMonitor.prototype.isSupported = function () {
return !!getPressureObserver();
};
/**
* Stop watching CPU pressure changes for the given callback.
* @param {PressureChangeCallback} callback - The callback function to stop listening to.
* @returns {void}
*/
ComputePressureMonitor.prototype.unwatchCpuPressure = function (callback) {
this._cpuPressureChangeListeners = this._cpuPressureChangeListeners.filter(function (cb) { return cb !== callback; });
if (this._cpuPressureChangeListeners.length === 0) {
this.cleanup();
}
};
/**
* @param {PressureRecord[]} records - An array containing all the PressureRecords observed since the last callback.
* @returns {void}
*/
ComputePressureMonitor.prototype._handleCpuPressureRecords = function (records) {
if (!Array.isArray(records) || records.length === 0) {
return;
}
var lastRecord = records[records.length - 1];
if (!lastRecord) {
return;
}
var hasChanged = lastRecord.state !== this._lastCpuPressure;
if (hasChanged) {
this._lastCpuPressure = lastRecord.state;
this._cpuPressureChangeListeners.forEach(function (callback) { return callback(lastRecord); });
}
};
/**
* Clean up all the resources created by the monitor.
* @returns {void}
*/
ComputePressureMonitor.prototype.cleanup = function () {
if (this._cpuPressureObserver) {
this._cpuPressureObserver.disconnect();
this._cpuPressureObserver = null;
}
this._cpuPressureChangeListeners = [];
this._lastCpuPressure = null;
};
return ComputePressureMonitor;
}());
module.exports = new ComputePressureMonitor();
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