Java中的一些延迟后的调用方法 [英] Call method after some delay in java

问题描述

场景就像:

在我的应用程序中，我打开了一个文件，对其进行了更新并保存.一旦文件保存事件被触发，它将执行一种方法abc(). 但是现在，我想在保存事件触发后添加延迟，例如1分钟.因此，我添加了Thread.sleep(60000).现在，它在1分钟后执行方法abc().到现在一切正常.

In my application, I opened one file, updated it and saved. Once the file saved event get fired and it will execute one method abc(). But now, I want to add delay after save event get fired, say 1 minute. So I have added Thread.sleep(60000). Now it execute the method abc() after 1 minute. Till now all works fine.

但是假设用户在1分钟内保存了3次文件，则该方法在每1分钟后执行3次.我只想在第一次保存后的1分钟内仅执行一次方法，并保存最新的文件内容.

But suppose user saved file 3 times within 1 minute, the method get executed 3 times after each 1 minute. I want to execute method only one time in next 1 minute after first save called with latest file content.

我该如何处理这种情况?

How can I handle such scenario?

推荐答案

使用计时器和 TimerTask

在YourClassType

让我们说:private Timer timer = new Timer();

，您的方法将如下所示:

and your method will look something like this:

public synchronized void abcCaller() {
    this.timer.cancel(); //this will cancel the current task. if there is no active task, nothing happens
    this.timer = new Timer();

    TimerTask action = new TimerTask() {
        public void run() {
            YourClassType.abc(); //as you said in the comments: abc is a static method
        }

    };

    this.timer.schedule(action, 60000); //this starts the task
}

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