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import buildModuleUrl from "./buildModuleUrl.js";
import defined from "./defined.js";
import destroyObject from "./destroyObject.js";
import DeveloperError from "./DeveloperError.js";
import Event from "./Event.js";
import FeatureDetection from "./FeatureDetection.js";
import isCrossOriginUrl from "./isCrossOriginUrl.js";
import Resource from "./Resource.js";
import RuntimeError from "./RuntimeError.js";
function canTransferArrayBuffer() {
if (!defined(TaskProcessor._canTransferArrayBuffer)) {
const worker = createWorker("transferTypedArrayTest");
worker.postMessage = worker.webkitPostMessage ?? worker.postMessage;
const value = 99;
const array = new Int8Array([value]);
try {
// postMessage might fail with a DataCloneError
// if transferring array buffers is not supported.
worker.postMessage(
{
array: array,
},
[array.buffer],
);
} catch (e) {
TaskProcessor._canTransferArrayBuffer = false;
return TaskProcessor._canTransferArrayBuffer;
}
TaskProcessor._canTransferArrayBuffer = new Promise((resolve) => {
worker.onmessage = function (event) {
const array = event.data.array;
// some versions of Firefox silently fail to transfer typed arrays.
// https://bugzilla.mozilla.org/show_bug.cgi?id=841904
// Check to make sure the value round-trips successfully.
const result = defined(array) && array[0] === value;
resolve(result);
worker.terminate();
TaskProcessor._canTransferArrayBuffer = result;
};
});
}
return TaskProcessor._canTransferArrayBuffer;
}
const taskCompletedEvent = new Event();
function urlFromScript(script) {
let blob;
try {
blob = new Blob([script], {
type: "application/javascript",
});
} catch (e) {
const BlobBuilder =
window.BlobBuilder ||
window.WebKitBlobBuilder ||
window.MozBlobBuilder ||
window.MSBlobBuilder;
const blobBuilder = new BlobBuilder();
blobBuilder.append(script);
blob = blobBuilder.getBlob("application/javascript");
}
const URL = window.URL || window.webkitURL;
return URL.createObjectURL(blob);
}
function createWorker(url) {
const uri = new Uri(url);
const isUri = uri.scheme().length !== 0 && uri.fragment().length === 0;
const moduleID = url.replace(/\.js$/, "");
const options = {};
let workerPath;
let crossOriginUrl;
// If we are provided a fully resolved URL, check it is cross-origin
// Or if provided a module ID, check the full absolute URL instead.
if (isCrossOriginUrl(url)) {
crossOriginUrl = url;
} else if (!isUri) {
const moduleAbsoluteUrl = buildModuleUrl(
`${TaskProcessor._workerModulePrefix}/${moduleID}.js`,
);
if (isCrossOriginUrl(moduleAbsoluteUrl)) {
crossOriginUrl = moduleAbsoluteUrl;
}
}
if (crossOriginUrl) {
// To load cross-origin, create a shim worker from a blob URL
const script = `import "${crossOriginUrl}";`;
workerPath = urlFromScript(script);
options.type = "module";
return new Worker(workerPath, options);
}
/* global CESIUM_WORKERS */
Iif (!isUri && typeof CESIUM_WORKERS !== "undefined") {
// If the workers are embedded, create a shim worker from the embedded script data
const script = `
importScripts("${urlFromScript(CESIUM_WORKERS)}");
CesiumWorkers["${moduleID}"]();
`;
workerPath = urlFromScript(script);
return new Worker(workerPath, options);
}
workerPath = url;
if (!isUri) {
workerPath = buildModuleUrl(
`${TaskProcessor._workerModulePrefix + moduleID}.js`,
);
}
if (!FeatureDetection.supportsEsmWebWorkers()) {
throw new RuntimeError(
"This browser is not supported. Please update your browser to continue.",
);
}
options.type = "module";
return new Worker(workerPath, options);
}
async function getWebAssemblyLoaderConfig(processor, wasmOptions) {
const config = {
modulePath: undefined,
wasmBinaryFile: undefined,
wasmBinary: undefined,
};
// Web assembly not supported, use fallback js module if provided
if (!FeatureDetection.supportsWebAssembly()) {
if (!defined(wasmOptions.fallbackModulePath)) {
throw new RuntimeError(
`This browser does not support Web Assembly, and no backup module was provided for ${processor._workerPath}`,
);
}
config.modulePath = buildModuleUrl(wasmOptions.fallbackModulePath);
return config;
}
config.wasmBinaryFile = buildModuleUrl(wasmOptions.wasmBinaryFile);
const arrayBuffer = await Resource.fetchArrayBuffer({
url: config.wasmBinaryFile,
});
config.wasmBinary = arrayBuffer;
return config;
}
/**
* A wrapper around a web worker that allows scheduling tasks for a given worker,
* returning results asynchronously via a promise.
*
* The Worker is not constructed until a task is scheduled.
*
* @alias TaskProcessor
* @constructor
*
* @param {string} workerPath The Url to the worker. This can either be an absolute path or relative to the Cesium Workers folder.
* @param {number} [maximumActiveTasks=Number.POSITIVE_INFINITY] The maximum number of active tasks. Once exceeded,
* scheduleTask will not queue any more tasks, allowing
* work to be rescheduled in future frames.
*/
function TaskProcessor(workerPath, maximumActiveTasks) {
this._workerPath = workerPath;
this._maximumActiveTasks = maximumActiveTasks ?? Number.POSITIVE_INFINITY;
this._activeTasks = 0;
this._nextID = 0;
this._webAssemblyPromise = undefined;
}
const createOnmessageHandler = (worker, id, resolve, reject) => {
const listener = ({ data }) => {
if (data.id !== id) {
return;
}
if (defined(data.error)) {
let error = data.error;
if (error.name === "RuntimeError") {
error = new RuntimeError(data.error.message);
error.stack = data.error.stack;
} else Iif (error.name === "DeveloperError") {
error = new DeveloperError(data.error.message);
error.stack = data.error.stack;
} else if (error.name === "Error") {
error = new Error(data.error.message);
error.stack = data.error.stack;
}
taskCompletedEvent.raiseEvent(error);
reject(error);
} else {
taskCompletedEvent.raiseEvent();
resolve(data.result);
}
worker.removeEventListener("message", listener);
};
return listener;
};
const emptyTransferableObjectArray = [];
async function runTask(processor, parameters, transferableObjects) {
const canTransfer = await Promise.resolve(canTransferArrayBuffer());
if (!defined(transferableObjects)) {
transferableObjects = emptyTransferableObjectArray;
} else Iif (!canTransfer) {
transferableObjects.length = 0;
}
const id = processor._nextID++;
const promise = new Promise((resolve, reject) => {
processor._worker.addEventListener(
"message",
createOnmessageHandler(processor._worker, id, resolve, reject),
);
});
processor._worker.postMessage(
{
id: id,
baseUrl: buildModuleUrl.getCesiumBaseUrl().url,
parameters: parameters,
canTransferArrayBuffer: canTransfer,
},
transferableObjects,
);
return promise;
}
async function scheduleTask(processor, parameters, transferableObjects) {
++processor._activeTasks;
try {
const result = await runTask(processor, parameters, transferableObjects);
--processor._activeTasks;
return result;
} catch (error) {
--processor._activeTasks;
throw error;
}
}
/**
* Schedule a task to be processed by the web worker asynchronously. If there are currently more
* tasks active than the maximum set by the constructor, will immediately return undefined.
* Otherwise, returns a promise that will resolve to the result posted back by the worker when
* finished.
*
* @param {object} parameters Any input data that will be posted to the worker.
* @param {object[]} [transferableObjects] An array of objects contained in parameters that should be
* transferred to the worker instead of copied.
* @returns {Promise<object>|undefined} Either a promise that will resolve to the result when available, or undefined
* if there are too many active tasks,
*
* @example
* const taskProcessor = new Cesium.TaskProcessor('myWorkerPath');
* const promise = taskProcessor.scheduleTask({
* someParameter : true,
* another : 'hello'
* });
* if (!Cesium.defined(promise)) {
* // too many active tasks - try again later
* } else {
* promise.then(function(result) {
* // use the result of the task
* });
* }
*/
TaskProcessor.prototype.scheduleTask = function (
parameters,
transferableObjects,
) {
if (!defined(this._worker)) {
this._worker = createWorker(this._workerPath);
}
if (this._activeTasks >= this._maximumActiveTasks) {
return undefined;
}
return scheduleTask(this, parameters, transferableObjects);
};
/**
* Posts a message to a web worker with configuration to initialize loading
* and compiling a web assembly module asynchronously, as well as an optional
* fallback JavaScript module to use if Web Assembly is not supported.
*
* @param {object} [webAssemblyOptions] An object with the following properties:
* @param {string} [webAssemblyOptions.modulePath] The path of the web assembly JavaScript wrapper module.
* @param {string} [webAssemblyOptions.wasmBinaryFile] The path of the web assembly binary file.
* @param {string} [webAssemblyOptions.fallbackModulePath] The path of the fallback JavaScript module to use if web assembly is not supported.
* @returns {Promise<*>} A promise that resolves to the result when the web worker has loaded and compiled the web assembly module and is ready to process tasks.
*
* @exception {RuntimeError} This browser does not support Web Assembly, and no backup module was provided
*/
TaskProcessor.prototype.initWebAssemblyModule = async function (
webAssemblyOptions,
) {
if (defined(this._webAssemblyPromise)) {
return this._webAssemblyPromise;
}
const init = async () => {
const worker = (this._worker = createWorker(this._workerPath));
const wasmConfig = await getWebAssemblyLoaderConfig(
this,
webAssemblyOptions,
);
const canTransfer = await Promise.resolve(canTransferArrayBuffer());
let transferableObjects;
const binary = wasmConfig.wasmBinary;
if (defined(binary) && canTransfer) {
transferableObjects = [binary];
}
const promise = new Promise((resolve, reject) => {
worker.onmessage = function ({ data }) {
if (defined(data)) {
resolve(data.result);
} else E{
reject(new RuntimeError("Could not configure wasm module"));
}
};
});
worker.postMessage(
{
canTransferArrayBuffer: canTransfer,
parameters: { webAssemblyConfig: wasmConfig },
},
transferableObjects,
);
return promise;
};
this._webAssemblyPromise = init();
return this._webAssemblyPromise;
};
/**
* Returns true if this object was destroyed; otherwise, false.
* <br /><br />
* If this object was destroyed, it should not be used; calling any function other than
* <code>isDestroyed</code> will result in a {@link DeveloperError} exception.
*
* @returns {boolean} True if this object was destroyed; otherwise, false.
*
* @see TaskProcessor#destroy
*/
TaskProcessor.prototype.isDestroyed = function () {
return false;
};
/**
* Destroys this object. This will immediately terminate the Worker.
* <br /><br />
* Once an object is destroyed, it should not be used; calling any function other than
* <code>isDestroyed</code> will result in a {@link DeveloperError} exception.
*/
TaskProcessor.prototype.destroy = function () {
if (defined(this._worker)) {
this._worker.terminate();
}
return destroyObject(this);
};
/**
* An event that's raised when a task is completed successfully. Event handlers are passed
* the error object is a task fails.
*
* @type {Event}
*
* @private
*/
TaskProcessor.taskCompletedEvent = taskCompletedEvent;
// exposed for testing purposes
TaskProcessor._defaultWorkerModulePrefix = "Workers/";
TaskProcessor._workerModulePrefix = TaskProcessor._defaultWorkerModulePrefix;
TaskProcessor._canTransferArrayBuffer = undefined;
export default TaskProcessor;
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