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Is filesystem polling only option? Or is there support for FSEvents (OSX), ReadDirectoryChangesW (Windows)?
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Create a WatchService "watcher" for the file system. For each directory that you want monitored, register it with the watcher. When registering a directory, you specify the type of events for which you want notification. You receive a WatchKey instance for each directory that you register.
A watch service that watches registered objects for changes and events. For example a file manager may use a watch service to monitor a directory for changes so that it can update its display of the list of files when files are created or deleted.
You can use a WatchService:
The implementation that observes events from the file system is intended to map directly on to the native file event notification facility where available, or to use a primitive mechanism, such as polling, when a native facility is not available
You can also have a look at this tutorial which confirms that point
Most file system implementations have native support for file change notification. The Watch Service API takes advantage of this support where available. However, when a file system does not support this mechanism, the Watch Service will poll the file system, waiting for events
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