/**
* Copyright (C) 2013-2015 all@code-story.net
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package net.codestory.http.reload;
import static com.sun.nio.file.SensitivityWatchEventModifier.HIGH;
import static java.nio.file.Files.walkFileTree;
import static java.nio.file.StandardWatchEventKinds.ENTRY_CREATE;
import static java.nio.file.StandardWatchEventKinds.ENTRY_DELETE;
import static java.nio.file.StandardWatchEventKinds.ENTRY_MODIFY;
import static java.nio.file.StandardWatchEventKinds.OVERFLOW;
import static net.codestory.http.io.FileVisitor.onDirectory;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.WatchEvent;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import java.util.concurrent.atomic.AtomicBoolean;
public class JdkWatchService implements WatchServiceFacade {
private final WatchService watcher;
private final AtomicBoolean run;
public JdkWatchService(Path folder) {
this.run = new AtomicBoolean(false);
try {
watcher = folder.getFileSystem().newWatchService();
walkFileTree(folder, onDirectory(dir -> dir.register(watcher, new WatchEvent.Kind[]{ENTRY_CREATE, ENTRY_MODIFY, ENTRY_DELETE}, HIGH)));
} catch (IOException e) {
throw new IllegalStateException("Unable to watch folder " + folder, e);
}
}
@Override
public void onChange(FolderChangeListener listener) {
new Thread(() -> {
run.set(true);
while (run.get()) {
notifyOnFileChange(listener);
}
}).start();
}
private void notifyOnFileChange(FolderChangeListener listener) {
try {
WatchKey take = watcher.take();
boolean changed = false;
for (WatchEvent<?> event : take.pollEvents()) {
if (event.kind() == OVERFLOW) {
continue;
}
// consume all events of this shitty API
changed = true;
}
if (changed) {
listener.onChange();
}
take.reset();
} catch (InterruptedException e) {
// Ignore
}
}
@Override
public void stop() {
run.set(false);
}
}