使用JavaFX Platform.runLater并从不同的线程访问UI [英] Usage of JavaFX Platform.runLater and access to UI from a different thread

问题描述

我有一些关于 Platform.runLater 的问题。我有一个JavaFX Application类。在这个类中，我运行一个线程（线程从网络套接字读取数据）。

I have a few questions about Platform.runLater. I have a JavaFX Application class. In this class I run a thread (The thread reads data from a network socket).

现在当我创建一个新的阶段在线程内部，系统抛出一个execption（JavaFX事件调度程序线程和我的netork-read线程不一样） - 我理解这种行为。

Now when I create a new Stage inside the thread, the system throws an execption (JavaFX event dispatcher thread and my netork-read thread are not the same) - I understand this behaviour.

但是另一方面，我将网络阅读器中的文本附加到现有的 TextArea 或添加/删除 ListView< String> <中的一些项目/ code> - 这不会抛出异常 - 为什么？我认为JavaFX是单线程的（ui库部分）。这与Swing中的相同：有时它有效，有时你只有垃圾（因为EDT）？

But the other side is, I append the text from the network-reader to an existing TextArea or add/remove some items in a ListView<String> - this doesn't throw an exception - why ? I thought JavaFX is singlethreaded (The ui library part). Is this the same thing as in Swing: Sometimes it works and sometimes you have just garbage (Because EDT)?

我的问题：

• JavaFX事件调度程序线程什么时候抛出异常？什么时候没有？


• 是否有关于此的任何好文档


• 使用 Platform.runLater 使用 run（）方法？结合try catch（或多次捕获），它看起来很奇怪



• When does the JavaFX event dispatcher thread throw an exception and when not ?
• Are the any good documents about this
• Is there an easier (shorter & cleaner) way to use Platform.runLater with a run() method ? In combination with a try catch (or multiple catch), it looks very strange

我知道的用法一个线程中的Platform.runLater 不是那么好（设计解决方案）

I know the usage of Platform.runLater in a thread isn't that nice (design solution)

推荐答案

这不是抛出异常 - 为什么？因为并非所有这些情况都是正确的......可能，由于性能方面的考虑，可能只是一个错过的功能。

"this doesn't throw an exception - why?" because not all such cases are cought... Possibly, because of performance considerations, possibly, it is just a missed functionality.

与JavaFX对象的所有交互（包括创建）必须在JFX线程上完成，如果要从另一个线程访问这些JFX对象 - 使用runLater或runAndWait方法。如果它现在不抛出异常，它可能会在将来开始抛出异常。任何与JFX对象的交互都可能导致后续操作和事件，这将由某些线程检查程序进行操作 - 您无法确定。

All interactions with JavaFX objects (including creation) must be done on JFX thread, if you want to access those JFX objects from another thread - use runLater or runAndWait methods. If it doesn't throw exception now, it possibly will start to throw exceptions in the future. Any interaction with JFX object may cause a subsequent actions and event, which will be cought by some thread checker - you cannot be sure.

我不认为，有关于这个的任何好文档 - 只是一个简单的规则 - 使用runLater或runAndWait。

I don't think, there is any good documentation on this - just a simple rule - use runLater or runAndWait.

将使用Lambda在JDK 8中提供更短更清洁的方式。

Shorter and cleaner way - will be provided in JDK 8 using Lambda.

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