Web Worker 的包装器，允许为给定的 Worker 调度任务，通过 Promise 异步返回结果。在安排任务之前，不会构建 Worker。 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.
| 名称 Name | 类型 Type | 默认值 Default | 说明 Description |
|---|---|---|---|
workerPath |
string | 工作人员的 URL。这可以是绝对路径，也可以是相对于 Cesium Workers 文件夹的路径。 The Url to the worker. This can either be an absolute path or relative to the Cesium Workers folder. | |
maximumActiveTasks |
number |
Number.POSITIVE_INFINITY
|
可选 optional 活动任务的最大数量。一旦超出，scheduleTask 将不再排队任何任务，从而允许在未来的帧中重新安排工作。 The maximum number of active tasks. Once exceeded, scheduleTask will not queue any more tasks, allowing work to be rescheduled in future frames. |
方法 Methods
销毁这个对象。这将立即终止该 Worker。 Destroys this object. This will immediately terminate the Worker.
一旦对象被销毁，就不应再使用；调用除 Once an object is destroyed, it should not be used; calling any function other than
一旦对象被销毁，就不应再使用；调用除 Once an object is destroyed, it should not be used; calling any function other than
isDestroyed 将导致 will result in a DeveloperError exception.
向 Web Worker 发布一条消息，其中包含用于初始化异步加载和编译 Web Assembly 模块的配置，以及在不支持 Web Assembly 时使用的可选后备 JavaScript 模块。 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.
| 名称 Name | 类型 Type | 说明 Description | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
webAssemblyOptions |
object |
可选 optional
具有以下属性的对象： An object with the following properties:
|
返回： Returns:
当 Web Worker 加载并编译 Web 程序集模块并准备好处理任务时，该承诺会解析为结果。 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.
抛出： Throws:
-
RuntimeError : This browser does not support Web Assembly, and no backup module was provided
如果该对象被销毁则返回 true；否则为假。 Returns true if this object was destroyed; otherwise, false.
如果该对象被破坏，则不应使用它；调用除 If this object was destroyed, it should not be used; calling any function other than
如果该对象被破坏，则不应使用它；调用除 If this object was destroyed, it should not be used; calling any function other than
isDestroyed 将导致 will result in a DeveloperError exception.
返回： Returns:
如果该对象被销毁，则为 True；否则为假。 True if this object was destroyed; otherwise, false.
另见： See:
安排由 Web Worker 异步处理的任务。如果当前活动的任务数量超过了构造函数设置的最大值，将立即返回 undefined。否则，返回一个承诺，该承诺将解析为完成后由工作人员发回的结果。 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.
| 名称 Name | 类型 Type | 说明 Description |
|---|---|---|
parameters |
object | 将发布给工作人员的任何输入数据。 Any input data that will be posted to the worker. |
transferableObjects |
Array.<object> | 可选 optional 参数中包含的对象数组，应传输给工作人员而不是复制。 An array of objects contained in parameters that should be transferred to the worker instead of copied. |
返回： Returns:
要么是在可用时解决结果的承诺，要么是未定义的（如果有太多活动任务）， Either a promise that will resolve to the result when available, or undefined if there are too many active tasks,
示例： 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
});
}