Java有内置的“反转”吗？摇摆工人
SwingWorker 允许您在后台Thread 中准备一些数据，然后在 EDT 中使用它。我正在寻找一个执行相反操作的实用程序：在 EDT 中准备数据，然后将其传递给后台线程。
如果您好奇，用例是将 JTable 的状态保存到磁盘（列顺序、大小等）。我需要在 EDT 中与其模型对话，但不想从此线程写入磁盘。
类似于：
void saveCurrentState(final Table table) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
TableColumns state = dumpState(table);
saveToDisk(table.getTableKey(), state);
}
});
}
dumpState() 需要在 EDT 中运行。 saveToDisk() 不应在 EDT 中运行。整个事情被故意包装在 invokeLater() 中，我无法用 invokeAndWait() 替换它。
SwingWorker lets you prepare some data in a background Thread and then use it in EDT. I am looking for a utility that does the opposite: Prepare data in EDT, and then pass it to a background Thread.
If you're curious, the use case is saving state of a JTable to disk (column order, size, etc.). I need to talk to its model in EDT, but don't want to write to disk from this thread.
Something like:
void saveCurrentState(final Table table) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
TableColumns state = dumpState(table);
saveToDisk(table.getTableKey(), state);
}
});
}
dumpState() needs to run in EDT. saveToDisk() should NOT run in EDT. The whole thing is deliberately wrapped in invokeLater(), and I cannot replace it with invokeAndWait().
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您可能正在寻找
ExecutorService< /代码>。使用Executors.newCachedThreadPool()– 或其他newXXX()方法，但该方法对于大多数用途来说应该没问题。也就是说，我相信这也是您可以使用
SwingWorker完成的事情。只需在创建SwingWorker之前在事件处理程序中准备好数据即可 - 您已经在 EDT 中了。如果您需要从非 EDT 线程启动此操作，请使用SwingUtilities.invokeAndWait()准备数据，然后分离另一个线程来执行写入操作（或在同一个非 EDT 线程中执行此操作） ）SwingWorker和ExecutorService提供相同的基本服务 - 将一些工作分拆到后台线程中，而无需显式管理其生命周期。SwingWorker有一种与 EDT 通信的便捷方法，无需在不需要使用的地方使用invokeLater()，并且ExecutorService> 支持 futures 作为与异步任务通信的更通用（非 Swing 特定）方式。对于您的一劳永逸用例来说，两者都很好。You're probably looking for
ExecutorService. Get one usingExecutors.newCachedThreadPool()– or the othernewXXX()methods, but that one should be okay for most uses.That said, I believe this is something you can do with
SwingWorkeras well. Just prepare your data in the event handler before you create aSwingWorker– you're already on the EDT there. If you need to initiate this from a non-EDT thread, prepare the data usingSwingUtilities.invokeAndWait(), and then spin off another thread to do the writing (or do it in the same non-EDT thread you started with.)SwingWorkerandExecutorServiceprovide the same basic service – spin off some work into a background thread without having to manage its lifecycle explicitly.SwingWorkerhas a convenient method of communicating with the EDT without usinginvokeLater()all over the place that you don't need to use, andExecutorServicesupports futures as a more general (non-Swing-specific) way of communicating with asynchronous task. For a fire-and-forget use case as yours both are fine.