How to schedule the thread's priority?

最新推荐文章于 2022-05-24 19:01:58 发布

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本文讨论了UI线程与工作线程在应用程序中的重要性，强调了使用线程对于构建响应迅速的GUI至关重要。文章介绍了如何通过合理设置工作线程的优先级、数量及适时挂起等手段来提高用户体验，并提供了Swing组件的最佳实践，如利用invokeLater与invokeAndWait方法将任务转移至事件分发线程。

1 UI application

The user is boss of the application, so the UI thread has highest priority. workerthread has lower priority.

· Keep the priorityof worker threads low.

· Keep the numberof worker threads small.

· Consider suspending worker threads duringCPU-intensive operations like scrolling.

Key Points

Using threads is essential for building responsive GUIs. Blocking user activity to wait for long tasks to complete leads to poor perceived performance.
The user is the boss. Always let your users know what's going on and give them regular status updates when waiting for long tasks to complete.
Once realized, Swing components should only be touched by code executing inside the AWT event-dispatch thread.
Use invokeLater and invokeAndWait to move work to the event dispatching thread.
Use timers for repeated operations. You can use either the javax.swing.Timer or java.util.Timer. The utility Timer class gives you more control, but you have to move work to the event- dispatch thread yourself. You can use the SwingTimerTask utility described in this chapter to move work to the event-dispatch thread.
Use SwingWorker to execute time-consuming tasks on new threads and update the GUI on the event-dispatch thread.
Interrupt worker threads when the user is driving the system.

2 Real time server application: