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package io.skas.melbjvm.nio2;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.nio.file.*;
/**
* @author Szymon Szukalski [szymon.szukalski@gmail.com]
*/
public class Watcher {
private static final Logger LOG = LoggerFactory.getLogger(Watcher.class);
public void watchDirectory(Path directory) throws IOException, InterruptedException {
// New try with resources
try (WatchService watchService = FileSystems.getDefault().newWatchService()) {
final WatchKey key = directory.register(
watchService,
StandardWatchEventKinds.ENTRY_CREATE,
StandardWatchEventKinds.ENTRY_MODIFY,
StandardWatchEventKinds.ENTRY_DELETE);
while (true) {
// retrieve and remove the next watch key (waits)
watchService.take();
// get list of events for the key
for (WatchEvent<?> watchEvent : key.pollEvents()) {
// get the event kind
final WatchEvent.Kind<?> kind = watchEvent.kind();
// get the filename for the event
final WatchEvent<Path> watchEventPath = (WatchEvent<Path>) watchEvent;
final Path filename = watchEventPath.context();
LOG.debug("event: {} filename: {}", kind, filename);
// handle OVERFLOW event
if (kind == StandardWatchEventKinds.OVERFLOW) {
continue;
}
// handle CREATE event
if (kind == StandardWatchEventKinds.ENTRY_CREATE) {
new AsynchronousFileReader(directory.resolve(filename));
}
}
// reset the key
boolean valid = key.reset();
// exit loop if the key is not valid (if the directory was deleted, for example)
if (!valid) {
break;
}
}
}
}
}
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