org.watertemplate.i18n.developer.DirectoryWatcher Maven / Gradle / Ivy
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Maven plugin that internationalizes your template files
package org.watertemplate.i18n.developer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.HashMap;
import java.util.Map;
import static com.sun.nio.file.SensitivityWatchEventModifier.HIGH;
import static java.nio.file.LinkOption.NOFOLLOW_LINKS;
import static java.nio.file.StandardWatchEventKinds.*;
public class DirectoryWatcher {
private final WatchService watcher;
private final Map keys;
private static final Logger LOGGER = LoggerFactory.getLogger(DirectoryWatcher.class);
public DirectoryWatcher(final String... dirs) {
try {
this.watcher = FileSystems.getDefault().newWatchService();
this.keys = new HashMap<>();
for (String dir : dirs) {
registerAll(Paths.get(dir));
}
LOGGER.info("Watching {}", dirs);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public void watchRunning(final Runnable r) {
final Thread thread = new Thread() {
@Override
public void run() {
while (true) {
try {
WatchKey key = watcher.take();
Path dir = keys.get(key);
for (WatchEvent> event : key.pollEvents()) {
WatchEvent ev = cast(event);
Path child = dir.resolve(ev.context());
if (child.toFile().isFile()) {
LOGGER.info("Rebuilding..");
try {
r.run();
} catch (Exception e) {
LOGGER.error("Error..", e);
}
if (event.kind() == ENTRY_CREATE) {
if (Files.isDirectory(child, NOFOLLOW_LINKS)) {
registerAll(child);
}
}
}
boolean valid = key.reset();
if (!valid) {
keys.remove(key);
if (keys.isEmpty()) {
break;
}
}
}
} catch (Exception ignored) {
}
}
}
};
thread.start();
}
private void registerAll(Path dirPath) throws IOException {
final WatchEvent.Kind[] events = {ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY};
Files.walkFileTree(dirPath, new SimpleFileVisitor() {
@Override
public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
WatchKey key = dir.register(watcher, events, HIGH);
keys.put(key, dir);
return FileVisitResult.CONTINUE;
}
});
}
@SuppressWarnings("unchecked")
private static WatchEvent cast(WatchEvent> event) {
return (WatchEvent) event;
}
}
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