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import java.io.File; | |
import java.io.IOException; | |
import java.nio.file.Files; | |
import java.nio.file.Path; | |
import java.nio.file.Paths; | |
import java.time.LocalDateTime; | |
import java.util.HashMap; | |
import java.util.Map; | |
import java.util.concurrent.TimeUnit; | |
import rx.Observable; | |
import rx.schedulers.Schedulers; | |
/** | |
* File watcher implements by RxJava. | |
* | |
* You should add dependencies | |
* compile 'io.reactivex:rxjava:1.1.0'. | |
* | |
* @author Toast kid | |
* | |
*/ | |
public class RxFileWatcher { | |
/** backup interval. */ | |
private static final long BACKUP_INTERVAL = TimeUnit.SECONDS.toMillis(5L); | |
/** file watcher target directory. */ | |
private static final String TARGET_DIR = "path/to/dir"; | |
/** Files map. */ | |
private static final Map<Path, Long> FILES = new HashMap<>(); | |
/** | |
* main method. | |
* @param args | |
* @throws IOException | |
*/ | |
public static void main(final String[] args) throws IOException { | |
initFiles(); | |
makeFileWatcher() | |
.subscribeOn(Schedulers.newThread()) | |
.subscribe(path -> { | |
System.out.println(LocalDateTime.now().toString() + " " + path.toString()); | |
}); | |
while (true) { | |
try { | |
System.out.printf("Sleep %dms\n", BACKUP_INTERVAL); | |
Thread.sleep(BACKUP_INTERVAL); | |
} catch (final InterruptedException e) { | |
e.printStackTrace(); | |
} | |
} | |
} | |
/** | |
* init files. | |
* @throws IOException | |
*/ | |
private static void initFiles() throws IOException { | |
final Path dir = Paths.get(TARGET_DIR); | |
if (!Files.isDirectory(dir)) { | |
return; | |
} | |
Files.list(dir) | |
.filter(path -> !Files.isDirectory(path)) | |
.forEach(path -> { | |
try { | |
FILES.put(path, Files.getLastModifiedTime(path).toMillis()); | |
} catch (final IOException e) { | |
e.printStackTrace(); | |
} | |
}); | |
} | |
/** | |
* make file watching observable.Scheduler | |
* @return Observable | |
*/ | |
private static Observable<Path> makeFileWatcher() { | |
return Observable.create((sub) -> { | |
Runtime.getRuntime().addShutdownHook(new Thread(() -> sub.onCompleted())); | |
while (true) { | |
System.out.println("Start check last modified."); | |
final File backup = new File("backup"); | |
if (!backup.exists() || !backup.isDirectory()) { | |
System.out.println("make backup dir."); | |
backup.mkdir(); | |
} | |
FILES | |
.entrySet().stream() | |
.filter(entry -> { | |
try { | |
final long ms = Files.getLastModifiedTime(entry.getKey()).toMillis(); | |
return entry.getValue() < ms; | |
} catch (final Exception e) { | |
sub.onError(e); | |
} | |
return false; | |
}) | |
.forEach(entry -> { | |
try { | |
final long ms = Files.getLastModifiedTime(entry.getKey()).toMillis(); | |
FILES.put(entry.getKey(), ms); | |
} catch (final Exception e) { | |
sub.onError(e); | |
} | |
sub.onNext(entry.getKey()); | |
}); | |
try { | |
System.out.printf("Observable sleeping %dms\n", BACKUP_INTERVAL); | |
Thread.sleep(BACKUP_INTERVAL); | |
} catch (final InterruptedException e) { | |
sub.onError(e); | |
} | |
} | |
}); | |
} | |
} |
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