File changed action

Asked Nov 17 '15 at 16:47

Active Nov 17 '15 at 16:47

Viewed 16 times

I need to monitor some single file for changes and react immediately when it changed.

Is it correct to solve this task with while(true) approach? Please, advice better solution if exists.

test code:

        File file = new File("d:\\clipboard-buffer.txt");

        long lastFileChangedTime = file.lastModified();

        while (true) {
            long fileChangedTime = file.lastModified();
            if (fileChangedTime != lastFileChangedTime) {
                System.out.println("File has modificated");
                lastFileChangedTime = fileChangedTime;
            }
            Thread.sleep(10);
        }

I'm looking for simple ways and don't need third-party libraries.

asked Nov 17 '15 at 16:47

Letfar

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The `WatchService` API is part of Java. – Sotirios Delimanolis Nov 17 '15 at 16:52
It monitors all directory, as I know. – Letfar Nov 17 '15 at 16:53
You can configure it to watch exactly what you need. – Sotirios Delimanolis Nov 17 '15 at 16:53
And in dir with 10k files it would work as fast as the code above? – Letfar Nov 17 '15 at 16:56
Probably faster. You can do appropriate benchmarking. – Sotirios Delimanolis Nov 17 '15 at 16:59

File changed action

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