每个工作者线程使用taskhandler类执行一部分工作。

Each worker thread performs some bit of work using the TaskHandler class.

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“工作者线程池”，通过在后台执行费时的操作使应用程序响应更加迅速。

A worker thread pool, to make web applications more responsive by performing expensive operations in the background.

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通常情况下，我们会在应用程序中创建一定数量的工作者线程来处理这些通知。

Typically an application will also create a number of worker threads to process these notifications.

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